chart.esm.js

/*!
 * Chart.js v3.5.1
 * https://www.chartjs.org
 * (c) 2021 Chart.js Contributors
 * Released under the MIT License
 */
import { r as requestAnimFrame, a as resolve, e as effects, c as color, d as defaults, i as isObject, b as isArray, v as valueOrDefault, u as unlistenArrayEvents, l as listenArrayEvents, f as resolveObjectKey, g as isNumberFinite, h as defined, s as sign, j as isNullOrUndef, _ as _arrayUnique, t as toRadians, k as toPercentage, m as toDimension, T as TAU, n as formatNumber, o as _angleBetween, H as HALF_PI, P as PI, p as isNumber, q as _limitValue, w as _lookupByKey, x as getRelativePosition$1, y as _isPointInArea, z as _rlookupByKey, A as toPadding, B as each, C as getMaximumSize, D as _getParentNode, E as readUsedSize, F as throttled, G as supportsEventListenerOptions, I as _isDomSupported, J as log10, K as _factorize, L as finiteOrDefault, M as callback, N as _addGrace, O as toDegrees, Q as _measureText, R as _int16Range, S as _alignPixel, U as clipArea, V as renderText, W as unclipArea, X as toFont, Y as _toLeftRightCenter, Z as _alignStartEnd, $ as overrides, a0 as merge, a1 as _capitalize, a2 as descriptors, a3 as isFunction, a4 as _attachContext, a5 as _createResolver, a6 as _descriptors, a7 as mergeIf, a8 as uid, a9 as debounce, aa as retinaScale, ab as clearCanvas, ac as setsEqual, ad as _elementsEqual, ae as getAngleFromPoint, af as _readValueToProps, ag as _updateBezierControlPoints, ah as _computeSegments, ai as _boundSegments, aj as _steppedInterpolation, ak as _bezierInterpolation, al as _pointInLine, am as _steppedLineTo, an as _bezierCurveTo, ao as drawPoint, ap as addRoundedRectPath, aq as toTRBL, ar as toTRBLCorners, as as _boundSegment, at as _normalizeAngle, au as getRtlAdapter, av as overrideTextDirection, aw as _textX, ax as restoreTextDirection, ay as noop, az as distanceBetweenPoints, aA as _setMinAndMaxByKey, aB as niceNum, aC as almostWhole, aD as almostEquals, aE as _decimalPlaces, aF as _longestText, aG as _filterBetween, aH as _lookup } from './chunks/helpers.segment.js';
export { d as defaults } from './chunks/helpers.segment.js';

class Animator {
  constructor() {
    this._request = null;
    this._charts = new Map();
    this._running = false;
    this._lastDate = undefined;
  }
  _notify(chart, anims, date, type) {
    const callbacks = anims.listeners[type];
    const numSteps = anims.duration;
    callbacks.forEach(fn => fn({
      chart,
      initial: anims.initial,
      numSteps,
      currentStep: Math.min(date - anims.start, numSteps)
    }));
  }
  _refresh() {
    const me = this;
    if (me._request) {
      return;
    }
    me._running = true;
    me._request = requestAnimFrame.call(window, () => {
      me._update();
      me._request = null;
      if (me._running) {
        me._refresh();
      }
    });
  }
  _update(date = Date.now()) {
    const me = this;
    let remaining = 0;
    me._charts.forEach((anims, chart) => {
      if (!anims.running || !anims.items.length) {
        return;
      }
      const items = anims.items;
      let i = items.length - 1;
      let draw = false;
      let item;
      for (; i >= 0; --i) {
        item = items[i];
        if (item._active) {
          if (item._total > anims.duration) {
            anims.duration = item._total;
          }
          item.tick(date);
          draw = true;
        } else {
          items[i] = items[items.length - 1];
          items.pop();
        }
      }
      if (draw) {
        chart.draw();
        me._notify(chart, anims, date, 'progress');
      }
      if (!items.length) {
        anims.running = false;
        me._notify(chart, anims, date, 'complete');
        anims.initial = false;
      }
      remaining += items.length;
    });
    me._lastDate = date;
    if (remaining === 0) {
      me._running = false;
    }
  }
  _getAnims(chart) {
    const charts = this._charts;
    let anims = charts.get(chart);
    if (!anims) {
      anims = {
        running: false,
        initial: true,
        items: [],
        listeners: {
          complete: [],
          progress: []
        }
      };
      charts.set(chart, anims);
    }
    return anims;
  }
  listen(chart, event, cb) {
    this._getAnims(chart).listeners[event].push(cb);
  }
  add(chart, items) {
    if (!items || !items.length) {
      return;
    }
    this._getAnims(chart).items.push(...items);
  }
  has(chart) {
    return this._getAnims(chart).items.length > 0;
  }
  start(chart) {
    const anims = this._charts.get(chart);
    if (!anims) {
      return;
    }
    anims.running = true;
    anims.start = Date.now();
    anims.duration = anims.items.reduce((acc, cur) => Math.max(acc, cur._duration), 0);
    this._refresh();
  }
  running(chart) {
    if (!this._running) {
      return false;
    }
    const anims = this._charts.get(chart);
    if (!anims || !anims.running || !anims.items.length) {
      return false;
    }
    return true;
  }
  stop(chart) {
    const anims = this._charts.get(chart);
    if (!anims || !anims.items.length) {
      return;
    }
    const items = anims.items;
    let i = items.length - 1;
    for (; i >= 0; --i) {
      items[i].cancel();
    }
    anims.items = [];
    this._notify(chart, anims, Date.now(), 'complete');
  }
  remove(chart) {
    return this._charts.delete(chart);
  }
}
var animator = new Animator();

const transparent = 'transparent';
const interpolators = {
  boolean(from, to, factor) {
    return factor > 0.5 ? to : from;
  },
  color(from, to, factor) {
    const c0 = color(from || transparent);
    const c1 = c0.valid && color(to || transparent);
    return c1 && c1.valid
      ? c1.mix(c0, factor).hexString()
      : to;
  },
  number(from, to, factor) {
    return from + (to - from) * factor;
  }
};
class Animation {
  constructor(cfg, target, prop, to) {
    const currentValue = target[prop];
    to = resolve([cfg.to, to, currentValue, cfg.from]);
    const from = resolve([cfg.from, currentValue, to]);
    this._active = true;
    this._fn = cfg.fn || interpolators[cfg.type || typeof from];
    this._easing = effects[cfg.easing] || effects.linear;
    this._start = Math.floor(Date.now() + (cfg.delay || 0));
    this._duration = this._total = Math.floor(cfg.duration);
    this._loop = !!cfg.loop;
    this._target = target;
    this._prop = prop;
    this._from = from;
    this._to = to;
    this._promises = undefined;
  }
  active() {
    return this._active;
  }
  update(cfg, to, date) {
    const me = this;
    if (me._active) {
      me._notify(false);
      const currentValue = me._target[me._prop];
      const elapsed = date - me._start;
      const remain = me._duration - elapsed;
      me._start = date;
      me._duration = Math.floor(Math.max(remain, cfg.duration));
      me._total += elapsed;
      me._loop = !!cfg.loop;
      me._to = resolve([cfg.to, to, currentValue, cfg.from]);
      me._from = resolve([cfg.from, currentValue, to]);
    }
  }
  cancel() {
    const me = this;
    if (me._active) {
      me.tick(Date.now());
      me._active = false;
      me._notify(false);
    }
  }
  tick(date) {
    const me = this;
    const elapsed = date - me._start;
    const duration = me._duration;
    const prop = me._prop;
    const from = me._from;
    const loop = me._loop;
    const to = me._to;
    let factor;
    me._active = from !== to && (loop || (elapsed < duration));
    if (!me._active) {
      me._target[prop] = to;
      me._notify(true);
      return;
    }
    if (elapsed < 0) {
      me._target[prop] = from;
      return;
    }
    factor = (elapsed / duration) % 2;
    factor = loop && factor > 1 ? 2 - factor : factor;
    factor = me._easing(Math.min(1, Math.max(0, factor)));
    me._target[prop] = me._fn(from, to, factor);
  }
  wait() {
    const promises = this._promises || (this._promises = []);
    return new Promise((res, rej) => {
      promises.push({res, rej});
    });
  }
  _notify(resolved) {
    const method = resolved ? 'res' : 'rej';
    const promises = this._promises || [];
    for (let i = 0; i < promises.length; i++) {
      promises[i][method]();
    }
  }
}

const numbers = ['x', 'y', 'borderWidth', 'radius', 'tension'];
const colors = ['color', 'borderColor', 'backgroundColor'];
defaults.set('animation', {
  delay: undefined,
  duration: 1000,
  easing: 'easeOutQuart',
  fn: undefined,
  from: undefined,
  loop: undefined,
  to: undefined,
  type: undefined,
});
const animationOptions = Object.keys(defaults.animation);
defaults.describe('animation', {
  _fallback: false,
  _indexable: false,
  _scriptable: (name) => name !== 'onProgress' && name !== 'onComplete' && name !== 'fn',
});
defaults.set('animations', {
  colors: {
    type: 'color',
    properties: colors
  },
  numbers: {
    type: 'number',
    properties: numbers
  },
});
defaults.describe('animations', {
  _fallback: 'animation',
});
defaults.set('transitions', {
  active: {
    animation: {
      duration: 400
    }
  },
  resize: {
    animation: {
      duration: 0
    }
  },
  show: {
    animations: {
      colors: {
        from: 'transparent'
      },
      visible: {
        type: 'boolean',
        duration: 0
      },
    }
  },
  hide: {
    animations: {
      colors: {
        to: 'transparent'
      },
      visible: {
        type: 'boolean',
        easing: 'linear',
        fn: v => v | 0
      },
    }
  }
});
class Animations {
  constructor(chart, config) {
    this._chart = chart;
    this._properties = new Map();
    this.configure(config);
  }
  configure(config) {
    if (!isObject(config)) {
      return;
    }
    const animatedProps = this._properties;
    Object.getOwnPropertyNames(config).forEach(key => {
      const cfg = config[key];
      if (!isObject(cfg)) {
        return;
      }
      const resolved = {};
      for (const option of animationOptions) {
        resolved[option] = cfg[option];
      }
      (isArray(cfg.properties) && cfg.properties || [key]).forEach((prop) => {
        if (prop === key || !animatedProps.has(prop)) {
          animatedProps.set(prop, resolved);
        }
      });
    });
  }
  _animateOptions(target, values) {
    const newOptions = values.options;
    const options = resolveTargetOptions(target, newOptions);
    if (!options) {
      return [];
    }
    const animations = this._createAnimations(options, newOptions);
    if (newOptions.$shared) {
      awaitAll(target.options.$animations, newOptions).then(() => {
        target.options = newOptions;
      }, () => {
      });
    }
    return animations;
  }
  _createAnimations(target, values) {
    const animatedProps = this._properties;
    const animations = [];
    const running = target.$animations || (target.$animations = {});
    const props = Object.keys(values);
    const date = Date.now();
    let i;
    for (i = props.length - 1; i >= 0; --i) {
      const prop = props[i];
      if (prop.charAt(0) === '$') {
        continue;
      }
      if (prop === 'options') {
        animations.push(...this._animateOptions(target, values));
        continue;
      }
      const value = values[prop];
      let animation = running[prop];
      const cfg = animatedProps.get(prop);
      if (animation) {
        if (cfg && animation.active()) {
          animation.update(cfg, value, date);
          continue;
        } else {
          animation.cancel();
        }
      }
      if (!cfg || !cfg.duration) {
        target[prop] = value;
        continue;
      }
      running[prop] = animation = new Animation(cfg, target, prop, value);
      animations.push(animation);
    }
    return animations;
  }
  update(target, values) {
    if (this._properties.size === 0) {
      Object.assign(target, values);
      return;
    }
    const animations = this._createAnimations(target, values);
    if (animations.length) {
      animator.add(this._chart, animations);
      return true;
    }
  }
}
function awaitAll(animations, properties) {
  const running = [];
  const keys = Object.keys(properties);
  for (let i = 0; i < keys.length; i++) {
    const anim = animations[keys[i]];
    if (anim && anim.active()) {
      running.push(anim.wait());
    }
  }
  return Promise.all(running);
}
function resolveTargetOptions(target, newOptions) {
  if (!newOptions) {
    return;
  }
  let options = target.options;
  if (!options) {
    target.options = newOptions;
    return;
  }
  if (options.$shared) {
    target.options = options = Object.assign({}, options, {$shared: false, $animations: {}});
  }
  return options;
}

function scaleClip(scale, allowedOverflow) {
  const opts = scale && scale.options || {};
  const reverse = opts.reverse;
  const min = opts.min === undefined ? allowedOverflow : 0;
  const max = opts.max === undefined ? allowedOverflow : 0;
  return {
    start: reverse ? max : min,
    end: reverse ? min : max
  };
}
function defaultClip(xScale, yScale, allowedOverflow) {
  if (allowedOverflow === false) {
    return false;
  }
  const x = scaleClip(xScale, allowedOverflow);
  const y = scaleClip(yScale, allowedOverflow);
  return {
    top: y.end,
    right: x.end,
    bottom: y.start,
    left: x.start
  };
}
function toClip(value) {
  let t, r, b, l;
  if (isObject(value)) {
    t = value.top;
    r = value.right;
    b = value.bottom;
    l = value.left;
  } else {
    t = r = b = l = value;
  }
  return {
    top: t,
    right: r,
    bottom: b,
    left: l,
    disabled: value === false
  };
}
function getSortedDatasetIndices(chart, filterVisible) {
  const keys = [];
  const metasets = chart._getSortedDatasetMetas(filterVisible);
  let i, ilen;
  for (i = 0, ilen = metasets.length; i < ilen; ++i) {
    keys.push(metasets[i].index);
  }
  return keys;
}
function applyStack(stack, value, dsIndex, options) {
  const keys = stack.keys;
  const singleMode = options.mode === 'single';
  let i, ilen, datasetIndex, otherValue;
  if (value === null) {
    return;
  }
  for (i = 0, ilen = keys.length; i < ilen; ++i) {
    datasetIndex = +keys[i];
    if (datasetIndex === dsIndex) {
      if (options.all) {
        continue;
      }
      break;
    }
    otherValue = stack.values[datasetIndex];
    if (isNumberFinite(otherValue) && (singleMode || (value === 0 || sign(value) === sign(otherValue)))) {
      value += otherValue;
    }
  }
  return value;
}
function convertObjectDataToArray(data) {
  const keys = Object.keys(data);
  const adata = new Array(keys.length);
  let i, ilen, key;
  for (i = 0, ilen = keys.length; i < ilen; ++i) {
    key = keys[i];
    adata[i] = {
      x: key,
      y: data[key]
    };
  }
  return adata;
}
function isStacked(scale, meta) {
  const stacked = scale && scale.options.stacked;
  return stacked || (stacked === undefined && meta.stack !== undefined);
}
function getStackKey(indexScale, valueScale, meta) {
  return `${indexScale.id}.${valueScale.id}.${meta.stack || meta.type}`;
}
function getUserBounds(scale) {
  const {min, max, minDefined, maxDefined} = scale.getUserBounds();
  return {
    min: minDefined ? min : Number.NEGATIVE_INFINITY,
    max: maxDefined ? max : Number.POSITIVE_INFINITY
  };
}
function getOrCreateStack(stacks, stackKey, indexValue) {
  const subStack = stacks[stackKey] || (stacks[stackKey] = {});
  return subStack[indexValue] || (subStack[indexValue] = {});
}
function getLastIndexInStack(stack, vScale, positive) {
  for (const meta of vScale.getMatchingVisibleMetas('bar').reverse()) {
    const value = stack[meta.index];
    if ((positive && value > 0) || (!positive && value < 0)) {
      return meta.index;
    }
  }
  return null;
}
function updateStacks(controller, parsed) {
  const {chart, _cachedMeta: meta} = controller;
  const stacks = chart._stacks || (chart._stacks = {});
  const {iScale, vScale, index: datasetIndex} = meta;
  const iAxis = iScale.axis;
  const vAxis = vScale.axis;
  const key = getStackKey(iScale, vScale, meta);
  const ilen = parsed.length;
  let stack;
  for (let i = 0; i < ilen; ++i) {
    const item = parsed[i];
    const {[iAxis]: index, [vAxis]: value} = item;
    const itemStacks = item._stacks || (item._stacks = {});
    stack = itemStacks[vAxis] = getOrCreateStack(stacks, key, index);
    stack[datasetIndex] = value;
    stack._top = getLastIndexInStack(stack, vScale, true);
    stack._bottom = getLastIndexInStack(stack, vScale, false);
  }
}
function getFirstScaleId(chart, axis) {
  const scales = chart.scales;
  return Object.keys(scales).filter(key => scales[key].axis === axis).shift();
}
function createDatasetContext(parent, index) {
  return Object.assign(Object.create(parent),
    {
      active: false,
      dataset: undefined,
      datasetIndex: index,
      index,
      mode: 'default',
      type: 'dataset'
    }
  );
}
function createDataContext(parent, index, element) {
  return Object.assign(Object.create(parent), {
    active: false,
    dataIndex: index,
    parsed: undefined,
    raw: undefined,
    element,
    index,
    mode: 'default',
    type: 'data'
  });
}
function clearStacks(meta, items) {
  const datasetIndex = meta.controller.index;
  const axis = meta.vScale && meta.vScale.axis;
  if (!axis) {
    return;
  }
  items = items || meta._parsed;
  for (const parsed of items) {
    const stacks = parsed._stacks;
    if (!stacks || stacks[axis] === undefined || stacks[axis][datasetIndex] === undefined) {
      return;
    }
    delete stacks[axis][datasetIndex];
  }
}
const isDirectUpdateMode = (mode) => mode === 'reset' || mode === 'none';
const cloneIfNotShared = (cached, shared) => shared ? cached : Object.assign({}, cached);
class DatasetController {
  constructor(chart, datasetIndex) {
    this.chart = chart;
    this._ctx = chart.ctx;
    this.index = datasetIndex;
    this._cachedDataOpts = {};
    this._cachedMeta = this.getMeta();
    this._type = this._cachedMeta.type;
    this.options = undefined;
    this._parsing = false;
    this._data = undefined;
    this._objectData = undefined;
    this._sharedOptions = undefined;
    this._drawStart = undefined;
    this._drawCount = undefined;
    this.enableOptionSharing = false;
    this.$context = undefined;
    this._syncList = [];
    this.initialize();
  }
  initialize() {
    const me = this;
    const meta = me._cachedMeta;
    me.configure();
    me.linkScales();
    meta._stacked = isStacked(meta.vScale, meta);
    me.addElements();
  }
  updateIndex(datasetIndex) {
    if (this.index !== datasetIndex) {
      clearStacks(this._cachedMeta);
    }
    this.index = datasetIndex;
  }
  linkScales() {
    const me = this;
    const chart = me.chart;
    const meta = me._cachedMeta;
    const dataset = me.getDataset();
    const chooseId = (axis, x, y, r) => axis === 'x' ? x : axis === 'r' ? r : y;
    const xid = meta.xAxisID = valueOrDefault(dataset.xAxisID, getFirstScaleId(chart, 'x'));
    const yid = meta.yAxisID = valueOrDefault(dataset.yAxisID, getFirstScaleId(chart, 'y'));
    const rid = meta.rAxisID = valueOrDefault(dataset.rAxisID, getFirstScaleId(chart, 'r'));
    const indexAxis = meta.indexAxis;
    const iid = meta.iAxisID = chooseId(indexAxis, xid, yid, rid);
    const vid = meta.vAxisID = chooseId(indexAxis, yid, xid, rid);
    meta.xScale = me.getScaleForId(xid);
    meta.yScale = me.getScaleForId(yid);
    meta.rScale = me.getScaleForId(rid);
    meta.iScale = me.getScaleForId(iid);
    meta.vScale = me.getScaleForId(vid);
  }
  getDataset() {
    return this.chart.data.datasets[this.index];
  }
  getMeta() {
    return this.chart.getDatasetMeta(this.index);
  }
  getScaleForId(scaleID) {
    return this.chart.scales[scaleID];
  }
  _getOtherScale(scale) {
    const meta = this._cachedMeta;
    return scale === meta.iScale
      ? meta.vScale
      : meta.iScale;
  }
  reset() {
    this._update('reset');
  }
  _destroy() {
    const meta = this._cachedMeta;
    if (this._data) {
      unlistenArrayEvents(this._data, this);
    }
    if (meta._stacked) {
      clearStacks(meta);
    }
  }
  _dataCheck() {
    const me = this;
    const dataset = me.getDataset();
    const data = dataset.data || (dataset.data = []);
    const _data = me._data;
    if (isObject(data)) {
      me._data = convertObjectDataToArray(data);
    } else if (_data !== data) {
      if (_data) {
        unlistenArrayEvents(_data, me);
        const meta = me._cachedMeta;
        clearStacks(meta);
        meta._parsed = [];
      }
      if (data && Object.isExtensible(data)) {
        listenArrayEvents(data, me);
      }
      me._syncList = [];
      me._data = data;
    }
  }
  addElements() {
    const me = this;
    const meta = me._cachedMeta;
    me._dataCheck();
    if (me.datasetElementType) {
      meta.dataset = new me.datasetElementType();
    }
  }
  buildOrUpdateElements(resetNewElements) {
    const me = this;
    const meta = me._cachedMeta;
    const dataset = me.getDataset();
    let stackChanged = false;
    me._dataCheck();
    const oldStacked = meta._stacked;
    meta._stacked = isStacked(meta.vScale, meta);
    if (meta.stack !== dataset.stack) {
      stackChanged = true;
      clearStacks(meta);
      meta.stack = dataset.stack;
    }
    me._resyncElements(resetNewElements);
    if (stackChanged || oldStacked !== meta._stacked) {
      updateStacks(me, meta._parsed);
    }
  }
  configure() {
    const me = this;
    const config = me.chart.config;
    const scopeKeys = config.datasetScopeKeys(me._type);
    const scopes = config.getOptionScopes(me.getDataset(), scopeKeys, true);
    me.options = config.createResolver(scopes, me.getContext());
    me._parsing = me.options.parsing;
  }
  parse(start, count) {
    const me = this;
    const {_cachedMeta: meta, _data: data} = me;
    const {iScale, _stacked} = meta;
    const iAxis = iScale.axis;
    let sorted = start === 0 && count === data.length ? true : meta._sorted;
    let prev = start > 0 && meta._parsed[start - 1];
    let i, cur, parsed;
    if (me._parsing === false) {
      meta._parsed = data;
      meta._sorted = true;
      parsed = data;
    } else {
      if (isArray(data[start])) {
        parsed = me.parseArrayData(meta, data, start, count);
      } else if (isObject(data[start])) {
        parsed = me.parseObjectData(meta, data, start, count);
      } else {
        parsed = me.parsePrimitiveData(meta, data, start, count);
      }
      const isNotInOrderComparedToPrev = () => cur[iAxis] === null || (prev && cur[iAxis] < prev[iAxis]);
      for (i = 0; i < count; ++i) {
        meta._parsed[i + start] = cur = parsed[i];
        if (sorted) {
          if (isNotInOrderComparedToPrev()) {
            sorted = false;
          }
          prev = cur;
        }
      }
      meta._sorted = sorted;
    }
    if (_stacked) {
      updateStacks(me, parsed);
    }
  }
  parsePrimitiveData(meta, data, start, count) {
    const {iScale, vScale} = meta;
    const iAxis = iScale.axis;
    const vAxis = vScale.axis;
    const labels = iScale.getLabels();
    const singleScale = iScale === vScale;
    const parsed = new Array(count);
    let i, ilen, index;
    for (i = 0, ilen = count; i < ilen; ++i) {
      index = i + start;
      parsed[i] = {
        [iAxis]: singleScale || iScale.parse(labels[index], index),
        [vAxis]: vScale.parse(data[index], index)
      };
    }
    return parsed;
  }
  parseArrayData(meta, data, start, count) {
    const {xScale, yScale} = meta;
    const parsed = new Array(count);
    let i, ilen, index, item;
    for (i = 0, ilen = count; i < ilen; ++i) {
      index = i + start;
      item = data[index];
      parsed[i] = {
        x: xScale.parse(item[0], index),
        y: yScale.parse(item[1], index)
      };
    }
    return parsed;
  }
  parseObjectData(meta, data, start, count) {
    const {xScale, yScale} = meta;
    const {xAxisKey = 'x', yAxisKey = 'y'} = this._parsing;
    const parsed = new Array(count);
    let i, ilen, index, item;
    for (i = 0, ilen = count; i < ilen; ++i) {
      index = i + start;
      item = data[index];
      parsed[i] = {
        x: xScale.parse(resolveObjectKey(item, xAxisKey), index),
        y: yScale.parse(resolveObjectKey(item, yAxisKey), index)
      };
    }
    return parsed;
  }
  getParsed(index) {
    return this._cachedMeta._parsed[index];
  }
  getDataElement(index) {
    return this._cachedMeta.data[index];
  }
  applyStack(scale, parsed, mode) {
    const chart = this.chart;
    const meta = this._cachedMeta;
    const value = parsed[scale.axis];
    const stack = {
      keys: getSortedDatasetIndices(chart, true),
      values: parsed._stacks[scale.axis]
    };
    return applyStack(stack, value, meta.index, {mode});
  }
  updateRangeFromParsed(range, scale, parsed, stack) {
    const parsedValue = parsed[scale.axis];
    let value = parsedValue === null ? NaN : parsedValue;
    const values = stack && parsed._stacks[scale.axis];
    if (stack && values) {
      stack.values = values;
      range.min = Math.min(range.min, value);
      range.max = Math.max(range.max, value);
      value = applyStack(stack, parsedValue, this._cachedMeta.index, {all: true});
    }
    range.min = Math.min(range.min, value);
    range.max = Math.max(range.max, value);
  }
  getMinMax(scale, canStack) {
    const me = this;
    const meta = me._cachedMeta;
    const _parsed = meta._parsed;
    const sorted = meta._sorted && scale === meta.iScale;
    const ilen = _parsed.length;
    const otherScale = me._getOtherScale(scale);
    const stack = canStack && meta._stacked && {keys: getSortedDatasetIndices(me.chart, true), values: null};
    const range = {min: Number.POSITIVE_INFINITY, max: Number.NEGATIVE_INFINITY};
    const {min: otherMin, max: otherMax} = getUserBounds(otherScale);
    let i, value, parsed, otherValue;
    function _skip() {
      parsed = _parsed[i];
      value = parsed[scale.axis];
      otherValue = parsed[otherScale.axis];
      return !isNumberFinite(value) || otherMin > otherValue || otherMax < otherValue;
    }
    for (i = 0; i < ilen; ++i) {
      if (_skip()) {
        continue;
      }
      me.updateRangeFromParsed(range, scale, parsed, stack);
      if (sorted) {
        break;
      }
    }
    if (sorted) {
      for (i = ilen - 1; i >= 0; --i) {
        if (_skip()) {
          continue;
        }
        me.updateRangeFromParsed(range, scale, parsed, stack);
        break;
      }
    }
    return range;
  }
  getAllParsedValues(scale) {
    const parsed = this._cachedMeta._parsed;
    const values = [];
    let i, ilen, value;
    for (i = 0, ilen = parsed.length; i < ilen; ++i) {
      value = parsed[i][scale.axis];
      if (isNumberFinite(value)) {
        values.push(value);
      }
    }
    return values;
  }
  getMaxOverflow() {
    return false;
  }
  getLabelAndValue(index) {
    const me = this;
    const meta = me._cachedMeta;
    const iScale = meta.iScale;
    const vScale = meta.vScale;
    const parsed = me.getParsed(index);
    return {
      label: iScale ? '' + iScale.getLabelForValue(parsed[iScale.axis]) : '',
      value: vScale ? '' + vScale.getLabelForValue(parsed[vScale.axis]) : ''
    };
  }
  _update(mode) {
    const me = this;
    const meta = me._cachedMeta;
    me.configure();
    me._cachedDataOpts = {};
    me.update(mode || 'default');
    meta._clip = toClip(valueOrDefault(me.options.clip, defaultClip(meta.xScale, meta.yScale, me.getMaxOverflow())));
  }
  update(mode) {}
  draw() {
    const me = this;
    const ctx = me._ctx;
    const chart = me.chart;
    const meta = me._cachedMeta;
    const elements = meta.data || [];
    const area = chart.chartArea;
    const active = [];
    const start = me._drawStart || 0;
    const count = me._drawCount || (elements.length - start);
    let i;
    if (meta.dataset) {
      meta.dataset.draw(ctx, area, start, count);
    }
    for (i = start; i < start + count; ++i) {
      const element = elements[i];
      if (element.hidden) {
        continue;
      }
      if (element.active) {
        active.push(element);
      } else {
        element.draw(ctx, area);
      }
    }
    for (i = 0; i < active.length; ++i) {
      active[i].draw(ctx, area);
    }
  }
  getStyle(index, active) {
    const mode = active ? 'active' : 'default';
    return index === undefined && this._cachedMeta.dataset
      ? this.resolveDatasetElementOptions(mode)
      : this.resolveDataElementOptions(index || 0, mode);
  }
  getContext(index, active, mode) {
    const me = this;
    const dataset = me.getDataset();
    let context;
    if (index >= 0 && index < me._cachedMeta.data.length) {
      const element = me._cachedMeta.data[index];
      context = element.$context ||
        (element.$context = createDataContext(me.getContext(), index, element));
      context.parsed = me.getParsed(index);
      context.raw = dataset.data[index];
      context.index = context.dataIndex = index;
    } else {
      context = me.$context ||
        (me.$context = createDatasetContext(me.chart.getContext(), me.index));
      context.dataset = dataset;
      context.index = context.datasetIndex = me.index;
    }
    context.active = !!active;
    context.mode = mode;
    return context;
  }
  resolveDatasetElementOptions(mode) {
    return this._resolveElementOptions(this.datasetElementType.id, mode);
  }
  resolveDataElementOptions(index, mode) {
    return this._resolveElementOptions(this.dataElementType.id, mode, index);
  }
  _resolveElementOptions(elementType, mode = 'default', index) {
    const me = this;
    const active = mode === 'active';
    const cache = me._cachedDataOpts;
    const cacheKey = elementType + '-' + mode;
    const cached = cache[cacheKey];
    const sharing = me.enableOptionSharing && defined(index);
    if (cached) {
      return cloneIfNotShared(cached, sharing);
    }
    const config = me.chart.config;
    const scopeKeys = config.datasetElementScopeKeys(me._type, elementType);
    const prefixes = active ? [`${elementType}Hover`, 'hover', elementType, ''] : [elementType, ''];
    const scopes = config.getOptionScopes(me.getDataset(), scopeKeys);
    const names = Object.keys(defaults.elements[elementType]);
    const context = () => me.getContext(index, active);
    const values = config.resolveNamedOptions(scopes, names, context, prefixes);
    if (values.$shared) {
      values.$shared = sharing;
      cache[cacheKey] = Object.freeze(cloneIfNotShared(values, sharing));
    }
    return values;
  }
  _resolveAnimations(index, transition, active) {
    const me = this;
    const chart = me.chart;
    const cache = me._cachedDataOpts;
    const cacheKey = `animation-${transition}`;
    const cached = cache[cacheKey];
    if (cached) {
      return cached;
    }
    let options;
    if (chart.options.animation !== false) {
      const config = me.chart.config;
      const scopeKeys = config.datasetAnimationScopeKeys(me._type, transition);
      const scopes = config.getOptionScopes(me.getDataset(), scopeKeys);
      options = config.createResolver(scopes, me.getContext(index, active, transition));
    }
    const animations = new Animations(chart, options && options.animations);
    if (options && options._cacheable) {
      cache[cacheKey] = Object.freeze(animations);
    }
    return animations;
  }
  getSharedOptions(options) {
    if (!options.$shared) {
      return;
    }
    return this._sharedOptions || (this._sharedOptions = Object.assign({}, options));
  }
  includeOptions(mode, sharedOptions) {
    return !sharedOptions || isDirectUpdateMode(mode) || this.chart._animationsDisabled;
  }
  updateElement(element, index, properties, mode) {
    if (isDirectUpdateMode(mode)) {
      Object.assign(element, properties);
    } else {
      this._resolveAnimations(index, mode).update(element, properties);
    }
  }
  updateSharedOptions(sharedOptions, mode, newOptions) {
    if (sharedOptions && !isDirectUpdateMode(mode)) {
      this._resolveAnimations(undefined, mode).update(sharedOptions, newOptions);
    }
  }
  _setStyle(element, index, mode, active) {
    element.active = active;
    const options = this.getStyle(index, active);
    this._resolveAnimations(index, mode, active).update(element, {
      options: (!active && this.getSharedOptions(options)) || options
    });
  }
  removeHoverStyle(element, datasetIndex, index) {
    this._setStyle(element, index, 'active', false);
  }
  setHoverStyle(element, datasetIndex, index) {
    this._setStyle(element, index, 'active', true);
  }
  _removeDatasetHoverStyle() {
    const element = this._cachedMeta.dataset;
    if (element) {
      this._setStyle(element, undefined, 'active', false);
    }
  }
  _setDatasetHoverStyle() {
    const element = this._cachedMeta.dataset;
    if (element) {
      this._setStyle(element, undefined, 'active', true);
    }
  }
  _resyncElements(resetNewElements) {
    const me = this;
    const data = me._data;
    const elements = me._cachedMeta.data;
    for (const [method, arg1, arg2] of me._syncList) {
      me[method](arg1, arg2);
    }
    me._syncList = [];
    const numMeta = elements.length;
    const numData = data.length;
    const count = Math.min(numData, numMeta);
    if (count) {
      me.parse(0, count);
    }
    if (numData > numMeta) {
      me._insertElements(numMeta, numData - numMeta, resetNewElements);
    } else if (numData < numMeta) {
      me._removeElements(numData, numMeta - numData);
    }
  }
  _insertElements(start, count, resetNewElements = true) {
    const me = this;
    const meta = me._cachedMeta;
    const data = meta.data;
    const end = start + count;
    let i;
    const move = (arr) => {
      arr.length += count;
      for (i = arr.length - 1; i >= end; i--) {
        arr[i] = arr[i - count];
      }
    };
    move(data);
    for (i = start; i < end; ++i) {
      data[i] = new me.dataElementType();
    }
    if (me._parsing) {
      move(meta._parsed);
    }
    me.parse(start, count);
    if (resetNewElements) {
      me.updateElements(data, start, count, 'reset');
    }
  }
  updateElements(element, start, count, mode) {}
  _removeElements(start, count) {
    const me = this;
    const meta = me._cachedMeta;
    if (me._parsing) {
      const removed = meta._parsed.splice(start, count);
      if (meta._stacked) {
        clearStacks(meta, removed);
      }
    }
    meta.data.splice(start, count);
  }
  _sync(args) {
    if (this._parsing) {
      this._syncList.push(args);
    } else {
      const [method, arg1, arg2] = args;
      this[method](arg1, arg2);
    }
  }
  _onDataPush() {
    const count = arguments.length;
    this._sync(['_insertElements', this.getDataset().data.length - count, count]);
  }
  _onDataPop() {
    this._sync(['_removeElements', this._cachedMeta.data.length - 1, 1]);
  }
  _onDataShift() {
    this._sync(['_removeElements', 0, 1]);
  }
  _onDataSplice(start, count) {
    this._sync(['_removeElements', start, count]);
    this._sync(['_insertElements', start, arguments.length - 2]);
  }
  _onDataUnshift() {
    this._sync(['_insertElements', 0, arguments.length]);
  }
}
DatasetController.defaults = {};
DatasetController.prototype.datasetElementType = null;
DatasetController.prototype.dataElementType = null;

function getAllScaleValues(scale) {
  if (!scale._cache.$bar) {
    const metas = scale.getMatchingVisibleMetas('bar');
    let values = [];
    for (let i = 0, ilen = metas.length; i < ilen; i++) {
      values = values.concat(metas[i].controller.getAllParsedValues(scale));
    }
    scale._cache.$bar = _arrayUnique(values.sort((a, b) => a - b));
  }
  return scale._cache.$bar;
}
function computeMinSampleSize(scale) {
  const values = getAllScaleValues(scale);
  let min = scale._length;
  let i, ilen, curr, prev;
  const updateMinAndPrev = () => {
    if (curr === 32767 || curr === -32768) {
      return;
    }
    if (defined(prev)) {
      min = Math.min(min, Math.abs(curr - prev) || min);
    }
    prev = curr;
  };
  for (i = 0, ilen = values.length; i < ilen; ++i) {
    curr = scale.getPixelForValue(values[i]);
    updateMinAndPrev();
  }
  prev = undefined;
  for (i = 0, ilen = scale.ticks.length; i < ilen; ++i) {
    curr = scale.getPixelForTick(i);
    updateMinAndPrev();
  }
  return min;
}
function computeFitCategoryTraits(index, ruler, options, stackCount) {
  const thickness = options.barThickness;
  let size, ratio;
  if (isNullOrUndef(thickness)) {
    size = ruler.min * options.categoryPercentage;
    ratio = options.barPercentage;
  } else {
    size = thickness * stackCount;
    ratio = 1;
  }
  return {
    chunk: size / stackCount,
    ratio,
    start: ruler.pixels[index] - (size / 2)
  };
}
function computeFlexCategoryTraits(index, ruler, options, stackCount) {
  const pixels = ruler.pixels;
  const curr = pixels[index];
  let prev = index > 0 ? pixels[index - 1] : null;
  let next = index < pixels.length - 1 ? pixels[index + 1] : null;
  const percent = options.categoryPercentage;
  if (prev === null) {
    prev = curr - (next === null ? ruler.end - ruler.start : next - curr);
  }
  if (next === null) {
    next = curr + curr - prev;
  }
  const start = curr - (curr - Math.min(prev, next)) / 2 * percent;
  const size = Math.abs(next - prev) / 2 * percent;
  return {
    chunk: size / stackCount,
    ratio: options.barPercentage,
    start
  };
}
function parseFloatBar(entry, item, vScale, i) {
  const startValue = vScale.parse(entry[0], i);
  const endValue = vScale.parse(entry[1], i);
  const min = Math.min(startValue, endValue);
  const max = Math.max(startValue, endValue);
  let barStart = min;
  let barEnd = max;
  if (Math.abs(min) > Math.abs(max)) {
    barStart = max;
    barEnd = min;
  }
  item[vScale.axis] = barEnd;
  item._custom = {
    barStart,
    barEnd,
    start: startValue,
    end: endValue,
    min,
    max
  };
}
function parseValue(entry, item, vScale, i) {
  if (isArray(entry)) {
    parseFloatBar(entry, item, vScale, i);
  } else {
    item[vScale.axis] = vScale.parse(entry, i);
  }
  return item;
}
function parseArrayOrPrimitive(meta, data, start, count) {
  const iScale = meta.iScale;
  const vScale = meta.vScale;
  const labels = iScale.getLabels();
  const singleScale = iScale === vScale;
  const parsed = [];
  let i, ilen, item, entry;
  for (i = start, ilen = start + count; i < ilen; ++i) {
    entry = data[i];
    item = {};
    item[iScale.axis] = singleScale || iScale.parse(labels[i], i);
    parsed.push(parseValue(entry, item, vScale, i));
  }
  return parsed;
}
function isFloatBar(custom) {
  return custom && custom.barStart !== undefined && custom.barEnd !== undefined;
}
function barSign(size, vScale, actualBase) {
  if (size !== 0) {
    return sign(size);
  }
  return (vScale.isHorizontal() ? 1 : -1) * (vScale.min >= actualBase ? 1 : -1);
}
function borderProps(properties) {
  let reverse, start, end, top, bottom;
  if (properties.horizontal) {
    reverse = properties.base > properties.x;
    start = 'left';
    end = 'right';
  } else {
    reverse = properties.base < properties.y;
    start = 'bottom';
    end = 'top';
  }
  if (reverse) {
    top = 'end';
    bottom = 'start';
  } else {
    top = 'start';
    bottom = 'end';
  }
  return {start, end, reverse, top, bottom};
}
function setBorderSkipped(properties, options, stack, index) {
  let edge = options.borderSkipped;
  const res = {};
  if (!edge) {
    properties.borderSkipped = res;
    return;
  }
  const {start, end, reverse, top, bottom} = borderProps(properties);
  if (edge === 'middle' && stack) {
    properties.enableBorderRadius = true;
    if ((stack._top || 0) === index) {
      edge = top;
    } else if ((stack._bottom || 0) === index) {
      edge = bottom;
    } else {
      res[parseEdge(bottom, start, end, reverse)] = true;
      edge = top;
    }
  }
  res[parseEdge(edge, start, end, reverse)] = true;
  properties.borderSkipped = res;
}
function parseEdge(edge, a, b, reverse) {
  if (reverse) {
    edge = swap(edge, a, b);
    edge = startEnd(edge, b, a);
  } else {
    edge = startEnd(edge, a, b);
  }
  return edge;
}
function swap(orig, v1, v2) {
  return orig === v1 ? v2 : orig === v2 ? v1 : orig;
}
function startEnd(v, start, end) {
  return v === 'start' ? start : v === 'end' ? end : v;
}
class BarController extends DatasetController {
  parsePrimitiveData(meta, data, start, count) {
    return parseArrayOrPrimitive(meta, data, start, count);
  }
  parseArrayData(meta, data, start, count) {
    return parseArrayOrPrimitive(meta, data, start, count);
  }
  parseObjectData(meta, data, start, count) {
    const {iScale, vScale} = meta;
    const {xAxisKey = 'x', yAxisKey = 'y'} = this._parsing;
    const iAxisKey = iScale.axis === 'x' ? xAxisKey : yAxisKey;
    const vAxisKey = vScale.axis === 'x' ? xAxisKey : yAxisKey;
    const parsed = [];
    let i, ilen, item, obj;
    for (i = start, ilen = start + count; i < ilen; ++i) {
      obj = data[i];
      item = {};
      item[iScale.axis] = iScale.parse(resolveObjectKey(obj, iAxisKey), i);
      parsed.push(parseValue(resolveObjectKey(obj, vAxisKey), item, vScale, i));
    }
    return parsed;
  }
  updateRangeFromParsed(range, scale, parsed, stack) {
    super.updateRangeFromParsed(range, scale, parsed, stack);
    const custom = parsed._custom;
    if (custom && scale === this._cachedMeta.vScale) {
      range.min = Math.min(range.min, custom.min);
      range.max = Math.max(range.max, custom.max);
    }
  }
  getMaxOverflow() {
    return 0;
  }
  getLabelAndValue(index) {
    const me = this;
    const meta = me._cachedMeta;
    const {iScale, vScale} = meta;
    const parsed = me.getParsed(index);
    const custom = parsed._custom;
    const value = isFloatBar(custom)
      ? '[' + custom.start + ', ' + custom.end + ']'
      : '' + vScale.getLabelForValue(parsed[vScale.axis]);
    return {
      label: '' + iScale.getLabelForValue(parsed[iScale.axis]),
      value
    };
  }
  initialize() {
    const me = this;
    me.enableOptionSharing = true;
    super.initialize();
    const meta = me._cachedMeta;
    meta.stack = me.getDataset().stack;
  }
  update(mode) {
    const me = this;
    const meta = me._cachedMeta;
    me.updateElements(meta.data, 0, meta.data.length, mode);
  }
  updateElements(bars, start, count, mode) {
    const me = this;
    const reset = mode === 'reset';
    const {index, _cachedMeta: {vScale}} = me;
    const base = vScale.getBasePixel();
    const horizontal = vScale.isHorizontal();
    const ruler = me._getRuler();
    const firstOpts = me.resolveDataElementOptions(start, mode);
    const sharedOptions = me.getSharedOptions(firstOpts);
    const includeOptions = me.includeOptions(mode, sharedOptions);
    me.updateSharedOptions(sharedOptions, mode, firstOpts);
    for (let i = start; i < start + count; i++) {
      const parsed = me.getParsed(i);
      const vpixels = reset || isNullOrUndef(parsed[vScale.axis]) ? {base, head: base} : me._calculateBarValuePixels(i);
      const ipixels = me._calculateBarIndexPixels(i, ruler);
      const stack = (parsed._stacks || {})[vScale.axis];
      const properties = {
        horizontal,
        base: vpixels.base,
        enableBorderRadius: !stack || isFloatBar(parsed._custom) || (index === stack._top || index === stack._bottom),
        x: horizontal ? vpixels.head : ipixels.center,
        y: horizontal ? ipixels.center : vpixels.head,
        height: horizontal ? ipixels.size : Math.abs(vpixels.size),
        width: horizontal ? Math.abs(vpixels.size) : ipixels.size
      };
      if (includeOptions) {
        properties.options = sharedOptions || me.resolveDataElementOptions(i, bars[i].active ? 'active' : mode);
      }
      setBorderSkipped(properties, properties.options || bars[i].options, stack, index);
      me.updateElement(bars[i], i, properties, mode);
    }
  }
  _getStacks(last, dataIndex) {
    const me = this;
    const meta = me._cachedMeta;
    const iScale = meta.iScale;
    const metasets = iScale.getMatchingVisibleMetas(me._type);
    const stacked = iScale.options.stacked;
    const ilen = metasets.length;
    const stacks = [];
    let i, item;
    for (i = 0; i < ilen; ++i) {
      item = metasets[i];
      if (!item.controller.options.grouped) {
        continue;
      }
      if (typeof dataIndex !== 'undefined') {
        const val = item.controller.getParsed(dataIndex)[
          item.controller._cachedMeta.vScale.axis
        ];
        if (isNullOrUndef(val) || isNaN(val)) {
          continue;
        }
      }
      if (stacked === false || stacks.indexOf(item.stack) === -1 ||
				(stacked === undefined && item.stack === undefined)) {
        stacks.push(item.stack);
      }
      if (item.index === last) {
        break;
      }
    }
    if (!stacks.length) {
      stacks.push(undefined);
    }
    return stacks;
  }
  _getStackCount(index) {
    return this._getStacks(undefined, index).length;
  }
  _getStackIndex(datasetIndex, name, dataIndex) {
    const stacks = this._getStacks(datasetIndex, dataIndex);
    const index = (name !== undefined)
      ? stacks.indexOf(name)
      : -1;
    return (index === -1)
      ? stacks.length - 1
      : index;
  }
  _getRuler() {
    const me = this;
    const opts = me.options;
    const meta = me._cachedMeta;
    const iScale = meta.iScale;
    const pixels = [];
    let i, ilen;
    for (i = 0, ilen = meta.data.length; i < ilen; ++i) {
      pixels.push(iScale.getPixelForValue(me.getParsed(i)[iScale.axis], i));
    }
    const barThickness = opts.barThickness;
    const min = barThickness || computeMinSampleSize(iScale);
    return {
      min,
      pixels,
      start: iScale._startPixel,
      end: iScale._endPixel,
      stackCount: me._getStackCount(),
      scale: iScale,
      grouped: opts.grouped,
      ratio: barThickness ? 1 : opts.categoryPercentage * opts.barPercentage
    };
  }
  _calculateBarValuePixels(index) {
    const me = this;
    const {_cachedMeta: {vScale, _stacked}, options: {base: baseValue, minBarLength}} = me;
    const actualBase = baseValue || 0;
    const parsed = me.getParsed(index);
    const custom = parsed._custom;
    const floating = isFloatBar(custom);
    let value = parsed[vScale.axis];
    let start = 0;
    let length = _stacked ? me.applyStack(vScale, parsed, _stacked) : value;
    let head, size;
    if (length !== value) {
      start = length - value;
      length = value;
    }
    if (floating) {
      value = custom.barStart;
      length = custom.barEnd - custom.barStart;
      if (value !== 0 && sign(value) !== sign(custom.barEnd)) {
        start = 0;
      }
      start += value;
    }
    const startValue = !isNullOrUndef(baseValue) && !floating ? baseValue : start;
    let base = vScale.getPixelForValue(startValue);
    if (me.chart.getDataVisibility(index)) {
      head = vScale.getPixelForValue(start + length);
    } else {
      head = base;
    }
    size = head - base;
    if (Math.abs(size) < minBarLength) {
      size = barSign(size, vScale, actualBase) * minBarLength;
      if (value === actualBase) {
        base -= size / 2;
      }
      head = base + size;
    }
    if (base === vScale.getPixelForValue(actualBase)) {
      const halfGrid = sign(size) * vScale.getLineWidthForValue(actualBase) / 2;
      base += halfGrid;
      size -= halfGrid;
    }
    return {
      size,
      base,
      head,
      center: head + size / 2
    };
  }
  _calculateBarIndexPixels(index, ruler) {
    const me = this;
    const scale = ruler.scale;
    const options = me.options;
    const skipNull = options.skipNull;
    const maxBarThickness = valueOrDefault(options.maxBarThickness, Infinity);
    let center, size;
    if (ruler.grouped) {
      const stackCount = skipNull ? me._getStackCount(index) : ruler.stackCount;
      const range = options.barThickness === 'flex'
        ? computeFlexCategoryTraits(index, ruler, options, stackCount)
        : computeFitCategoryTraits(index, ruler, options, stackCount);
      const stackIndex = me._getStackIndex(me.index, me._cachedMeta.stack, skipNull ? index : undefined);
      center = range.start + (range.chunk * stackIndex) + (range.chunk / 2);
      size = Math.min(maxBarThickness, range.chunk * range.ratio);
    } else {
      center = scale.getPixelForValue(me.getParsed(index)[scale.axis], index);
      size = Math.min(maxBarThickness, ruler.min * ruler.ratio);
    }
    return {
      base: center - size / 2,
      head: center + size / 2,
      center,
      size
    };
  }
  draw() {
    const me = this;
    const meta = me._cachedMeta;
    const vScale = meta.vScale;
    const rects = meta.data;
    const ilen = rects.length;
    let i = 0;
    for (; i < ilen; ++i) {
      if (me.getParsed(i)[vScale.axis] !== null) {
        rects[i].draw(me._ctx);
      }
    }
  }
}
BarController.id = 'bar';
BarController.defaults = {
  datasetElementType: false,
  dataElementType: 'bar',
  categoryPercentage: 0.8,
  barPercentage: 0.9,
  grouped: true,
  animations: {
    numbers: {
      type: 'number',
      properties: ['x', 'y', 'base', 'width', 'height']
    }
  }
};
BarController.overrides = {
  scales: {
    _index_: {
      type: 'category',
      offset: true,
      grid: {
        offset: true
      }
    },
    _value_: {
      type: 'linear',
      beginAtZero: true,
    }
  }
};

class BubbleController extends DatasetController {
  initialize() {
    this.enableOptionSharing = true;
    super.initialize();
  }
  parseObjectData(meta, data, start, count) {
    const {xScale, yScale} = meta;
    const {xAxisKey = 'x', yAxisKey = 'y'} = this._parsing;
    const parsed = [];
    let i, ilen, item;
    for (i = start, ilen = start + count; i < ilen; ++i) {
      item = data[i];
      parsed.push({
        x: xScale.parse(resolveObjectKey(item, xAxisKey), i),
        y: yScale.parse(resolveObjectKey(item, yAxisKey), i),
        _custom: item && item.r && +item.r
      });
    }
    return parsed;
  }
  getMaxOverflow() {
    const {data, _parsed} = this._cachedMeta;
    let max = 0;
    for (let i = data.length - 1; i >= 0; --i) {
      max = Math.max(max, data[i].size() / 2, _parsed[i]._custom);
    }
    return max > 0 && max;
  }
  getLabelAndValue(index) {
    const me = this;
    const meta = me._cachedMeta;
    const {xScale, yScale} = meta;
    const parsed = me.getParsed(index);
    const x = xScale.getLabelForValue(parsed.x);
    const y = yScale.getLabelForValue(parsed.y);
    const r = parsed._custom;
    return {
      label: meta.label,
      value: '(' + x + ', ' + y + (r ? ', ' + r : '') + ')'
    };
  }
  update(mode) {
    const me = this;
    const points = me._cachedMeta.data;
    me.updateElements(points, 0, points.length, mode);
  }
  updateElements(points, start, count, mode) {
    const me = this;
    const reset = mode === 'reset';
    const {iScale, vScale} = me._cachedMeta;
    const firstOpts = me.resolveDataElementOptions(start, mode);
    const sharedOptions = me.getSharedOptions(firstOpts);
    const includeOptions = me.includeOptions(mode, sharedOptions);
    const iAxis = iScale.axis;
    const vAxis = vScale.axis;
    for (let i = start; i < start + count; i++) {
      const point = points[i];
      const parsed = !reset && me.getParsed(i);
      const properties = {};
      const iPixel = properties[iAxis] = reset ? iScale.getPixelForDecimal(0.5) : iScale.getPixelForValue(parsed[iAxis]);
      const vPixel = properties[vAxis] = reset ? vScale.getBasePixel() : vScale.getPixelForValue(parsed[vAxis]);
      properties.skip = isNaN(iPixel) || isNaN(vPixel);
      if (includeOptions) {
        properties.options = me.resolveDataElementOptions(i, point.active ? 'active' : mode);
        if (reset) {
          properties.options.radius = 0;
        }
      }
      me.updateElement(point, i, properties, mode);
    }
    me.updateSharedOptions(sharedOptions, mode, firstOpts);
  }
  resolveDataElementOptions(index, mode) {
    const parsed = this.getParsed(index);
    let values = super.resolveDataElementOptions(index, mode);
    if (values.$shared) {
      values = Object.assign({}, values, {$shared: false});
    }
    const radius = values.radius;
    if (mode !== 'active') {
      values.radius = 0;
    }
    values.radius += valueOrDefault(parsed && parsed._custom, radius);
    return values;
  }
}
BubbleController.id = 'bubble';
BubbleController.defaults = {
  datasetElementType: false,
  dataElementType: 'point',
  animations: {
    numbers: {
      type: 'number',
      properties: ['x', 'y', 'borderWidth', 'radius']
    }
  }
};
BubbleController.overrides = {
  scales: {
    x: {
      type: 'linear'
    },
    y: {
      type: 'linear'
    }
  },
  plugins: {
    tooltip: {
      callbacks: {
        title() {
          return '';
        }
      }
    }
  }
};

function getRatioAndOffset(rotation, circumference, cutout) {
  let ratioX = 1;
  let ratioY = 1;
  let offsetX = 0;
  let offsetY = 0;
  if (circumference < TAU) {
    const startAngle = rotation;
    const endAngle = startAngle + circumference;
    const startX = Math.cos(startAngle);
    const startY = Math.sin(startAngle);
    const endX = Math.cos(endAngle);
    const endY = Math.sin(endAngle);
    const calcMax = (angle, a, b) => _angleBetween(angle, startAngle, endAngle, true) ? 1 : Math.max(a, a * cutout, b, b * cutout);
    const calcMin = (angle, a, b) => _angleBetween(angle, startAngle, endAngle, true) ? -1 : Math.min(a, a * cutout, b, b * cutout);
    const maxX = calcMax(0, startX, endX);
    const maxY = calcMax(HALF_PI, startY, endY);
    const minX = calcMin(PI, startX, endX);
    const minY = calcMin(PI + HALF_PI, startY, endY);
    ratioX = (maxX - minX) / 2;
    ratioY = (maxY - minY) / 2;
    offsetX = -(maxX + minX) / 2;
    offsetY = -(maxY + minY) / 2;
  }
  return {ratioX, ratioY, offsetX, offsetY};
}
class DoughnutController extends DatasetController {
  constructor(chart, datasetIndex) {
    super(chart, datasetIndex);
    this.enableOptionSharing = true;
    this.innerRadius = undefined;
    this.outerRadius = undefined;
    this.offsetX = undefined;
    this.offsetY = undefined;
  }
  linkScales() {}
  parse(start, count) {
    const data = this.getDataset().data;
    const meta = this._cachedMeta;
    let i, ilen;
    for (i = start, ilen = start + count; i < ilen; ++i) {
      meta._parsed[i] = +data[i];
    }
  }
  _getRotation() {
    return toRadians(this.options.rotation - 90);
  }
  _getCircumference() {
    return toRadians(this.options.circumference);
  }
  _getRotationExtents() {
    let min = TAU;
    let max = -TAU;
    const me = this;
    for (let i = 0; i < me.chart.data.datasets.length; ++i) {
      if (me.chart.isDatasetVisible(i)) {
        const controller = me.chart.getDatasetMeta(i).controller;
        const rotation = controller._getRotation();
        const circumference = controller._getCircumference();
        min = Math.min(min, rotation);
        max = Math.max(max, rotation + circumference);
      }
    }
    return {
      rotation: min,
      circumference: max - min,
    };
  }
  update(mode) {
    const me = this;
    const chart = me.chart;
    const {chartArea} = chart;
    const meta = me._cachedMeta;
    const arcs = meta.data;
    const spacing = me.getMaxBorderWidth() + me.getMaxOffset(arcs) + me.options.spacing;
    const maxSize = Math.max((Math.min(chartArea.width, chartArea.height) - spacing) / 2, 0);
    const cutout = Math.min(toPercentage(me.options.cutout, maxSize), 1);
    const chartWeight = me._getRingWeight(me.index);
    const {circumference, rotation} = me._getRotationExtents();
    const {ratioX, ratioY, offsetX, offsetY} = getRatioAndOffset(rotation, circumference, cutout);
    const maxWidth = (chartArea.width - spacing) / ratioX;
    const maxHeight = (chartArea.height - spacing) / ratioY;
    const maxRadius = Math.max(Math.min(maxWidth, maxHeight) / 2, 0);
    const outerRadius = toDimension(me.options.radius, maxRadius);
    const innerRadius = Math.max(outerRadius * cutout, 0);
    const radiusLength = (outerRadius - innerRadius) / me._getVisibleDatasetWeightTotal();
    me.offsetX = offsetX * outerRadius;
    me.offsetY = offsetY * outerRadius;
    meta.total = me.calculateTotal();
    me.outerRadius = outerRadius - radiusLength * me._getRingWeightOffset(me.index);
    me.innerRadius = Math.max(me.outerRadius - radiusLength * chartWeight, 0);
    me.updateElements(arcs, 0, arcs.length, mode);
  }
  _circumference(i, reset) {
    const me = this;
    const opts = me.options;
    const meta = me._cachedMeta;
    const circumference = me._getCircumference();
    if ((reset && opts.animation.animateRotate) || !this.chart.getDataVisibility(i) || meta._parsed[i] === null || meta.data[i].hidden) {
      return 0;
    }
    return me.calculateCircumference(meta._parsed[i] * circumference / TAU);
  }
  updateElements(arcs, start, count, mode) {
    const me = this;
    const reset = mode === 'reset';
    const chart = me.chart;
    const chartArea = chart.chartArea;
    const opts = chart.options;
    const animationOpts = opts.animation;
    const centerX = (chartArea.left + chartArea.right) / 2;
    const centerY = (chartArea.top + chartArea.bottom) / 2;
    const animateScale = reset && animationOpts.animateScale;
    const innerRadius = animateScale ? 0 : me.innerRadius;
    const outerRadius = animateScale ? 0 : me.outerRadius;
    const firstOpts = me.resolveDataElementOptions(start, mode);
    const sharedOptions = me.getSharedOptions(firstOpts);
    const includeOptions = me.includeOptions(mode, sharedOptions);
    let startAngle = me._getRotation();
    let i;
    for (i = 0; i < start; ++i) {
      startAngle += me._circumference(i, reset);
    }
    for (i = start; i < start + count; ++i) {
      const circumference = me._circumference(i, reset);
      const arc = arcs[i];
      const properties = {
        x: centerX + me.offsetX,
        y: centerY + me.offsetY,
        startAngle,
        endAngle: startAngle + circumference,
        circumference,
        outerRadius,
        innerRadius
      };
      if (includeOptions) {
        properties.options = sharedOptions || me.resolveDataElementOptions(i, arc.active ? 'active' : mode);
      }
      startAngle += circumference;
      me.updateElement(arc, i, properties, mode);
    }
    me.updateSharedOptions(sharedOptions, mode, firstOpts);
  }
  calculateTotal() {
    const meta = this._cachedMeta;
    const metaData = meta.data;
    let total = 0;
    let i;
    for (i = 0; i < metaData.length; i++) {
      const value = meta._parsed[i];
      if (value !== null && !isNaN(value) && this.chart.getDataVisibility(i) && !metaData[i].hidden) {
        total += Math.abs(value);
      }
    }
    return total;
  }
  calculateCircumference(value) {
    const total = this._cachedMeta.total;
    if (total > 0 && !isNaN(value)) {
      return TAU * (Math.abs(value) / total);
    }
    return 0;
  }
  getLabelAndValue(index) {
    const me = this;
    const meta = me._cachedMeta;
    const chart = me.chart;
    const labels = chart.data.labels || [];
    const value = formatNumber(meta._parsed[index], chart.options.locale);
    return {
      label: labels[index] || '',
      value,
    };
  }
  getMaxBorderWidth(arcs) {
    const me = this;
    let max = 0;
    const chart = me.chart;
    let i, ilen, meta, controller, options;
    if (!arcs) {
      for (i = 0, ilen = chart.data.datasets.length; i < ilen; ++i) {
        if (chart.isDatasetVisible(i)) {
          meta = chart.getDatasetMeta(i);
          arcs = meta.data;
          controller = meta.controller;
          if (controller !== me) {
            controller.configure();
          }
          break;
        }
      }
    }
    if (!arcs) {
      return 0;
    }
    for (i = 0, ilen = arcs.length; i < ilen; ++i) {
      options = controller.resolveDataElementOptions(i);
      if (options.borderAlign !== 'inner') {
        max = Math.max(max, options.borderWidth || 0, options.hoverBorderWidth || 0);
      }
    }
    return max;
  }
  getMaxOffset(arcs) {
    let max = 0;
    for (let i = 0, ilen = arcs.length; i < ilen; ++i) {
      const options = this.resolveDataElementOptions(i);
      max = Math.max(max, options.offset || 0, options.hoverOffset || 0);
    }
    return max;
  }
  _getRingWeightOffset(datasetIndex) {
    let ringWeightOffset = 0;
    for (let i = 0; i < datasetIndex; ++i) {
      if (this.chart.isDatasetVisible(i)) {
        ringWeightOffset += this._getRingWeight(i);
      }
    }
    return ringWeightOffset;
  }
  _getRingWeight(datasetIndex) {
    return Math.max(valueOrDefault(this.chart.data.datasets[datasetIndex].weight, 1), 0);
  }
  _getVisibleDatasetWeightTotal() {
    return this._getRingWeightOffset(this.chart.data.datasets.length) || 1;
  }
}
DoughnutController.id = 'doughnut';
DoughnutController.defaults = {
  datasetElementType: false,
  dataElementType: 'arc',
  animation: {
    animateRotate: true,
    animateScale: false
  },
  animations: {
    numbers: {
      type: 'number',
      properties: ['circumference', 'endAngle', 'innerRadius', 'outerRadius', 'startAngle', 'x', 'y', 'offset', 'borderWidth', 'spacing']
    },
  },
  cutout: '50%',
  rotation: 0,
  circumference: 360,
  radius: '100%',
  spacing: 0,
  indexAxis: 'r',
};
DoughnutController.descriptors = {
  _scriptable: (name) => name !== 'spacing',
  _indexable: (name) => name !== 'spacing',
};
DoughnutController.overrides = {
  aspectRatio: 1,
  plugins: {
    legend: {
      labels: {
        generateLabels(chart) {
          const data = chart.data;
          if (data.labels.length && data.datasets.length) {
            const {labels: {pointStyle}} = chart.legend.options;
            return data.labels.map((label, i) => {
              const meta = chart.getDatasetMeta(0);
              const style = meta.controller.getStyle(i);
              return {
                text: label,
                fillStyle: style.backgroundColor,
                strokeStyle: style.borderColor,
                lineWidth: style.borderWidth,
                pointStyle: pointStyle,
                hidden: !chart.getDataVisibility(i),
                index: i
              };
            });
          }
          return [];
        }
      },
      onClick(e, legendItem, legend) {
        legend.chart.toggleDataVisibility(legendItem.index);
        legend.chart.update();
      }
    },
    tooltip: {
      callbacks: {
        title() {
          return '';
        },
        label(tooltipItem) {
          let dataLabel = tooltipItem.label;
          const value = ': ' + tooltipItem.formattedValue;
          if (isArray(dataLabel)) {
            dataLabel = dataLabel.slice();
            dataLabel[0] += value;
          } else {
            dataLabel += value;
          }
          return dataLabel;
        }
      }
    }
  }
};

class LineController extends DatasetController {
  initialize() {
    this.enableOptionSharing = true;
    super.initialize();
  }
  update(mode) {
    const me = this;
    const meta = me._cachedMeta;
    const {dataset: line, data: points = [], _dataset} = meta;
    const animationsDisabled = me.chart._animationsDisabled;
    let {start, count} = getStartAndCountOfVisiblePoints(meta, points, animationsDisabled);
    me._drawStart = start;
    me._drawCount = count;
    if (scaleRangesChanged(meta)) {
      start = 0;
      count = points.length;
    }
    line._datasetIndex = me.index;
    line._decimated = !!_dataset._decimated;
    line.points = points;
    const options = me.resolveDatasetElementOptions(mode);
    if (!me.options.showLine) {
      options.borderWidth = 0;
    }
    options.segment = me.options.segment;
    me.updateElement(line, undefined, {
      animated: !animationsDisabled,
      options
    }, mode);
    me.updateElements(points, start, count, mode);
  }
  updateElements(points, start, count, mode) {
    const me = this;
    const reset = mode === 'reset';
    const {iScale, vScale, _stacked} = me._cachedMeta;
    const firstOpts = me.resolveDataElementOptions(start, mode);
    const sharedOptions = me.getSharedOptions(firstOpts);
    const includeOptions = me.includeOptions(mode, sharedOptions);
    const iAxis = iScale.axis;
    const vAxis = vScale.axis;
    const spanGaps = me.options.spanGaps;
    const maxGapLength = isNumber(spanGaps) ? spanGaps : Number.POSITIVE_INFINITY;
    const directUpdate = me.chart._animationsDisabled || reset || mode === 'none';
    let prevParsed = start > 0 && me.getParsed(start - 1);
    for (let i = start; i < start + count; ++i) {
      const point = points[i];
      const parsed = me.getParsed(i);
      const properties = directUpdate ? point : {};
      const nullData = isNullOrUndef(parsed[vAxis]);
      const iPixel = properties[iAxis] = iScale.getPixelForValue(parsed[iAxis], i);
      const vPixel = properties[vAxis] = reset || nullData ? vScale.getBasePixel() : vScale.getPixelForValue(_stacked ? me.applyStack(vScale, parsed, _stacked) : parsed[vAxis], i);
      properties.skip = isNaN(iPixel) || isNaN(vPixel) || nullData;
      properties.stop = i > 0 && (parsed[iAxis] - prevParsed[iAxis]) > maxGapLength;
      properties.parsed = parsed;
      if (includeOptions) {
        properties.options = sharedOptions || me.resolveDataElementOptions(i, point.active ? 'active' : mode);
      }
      if (!directUpdate) {
        me.updateElement(point, i, properties, mode);
      }
      prevParsed = parsed;
    }
    me.updateSharedOptions(sharedOptions, mode, firstOpts);
  }
  getMaxOverflow() {
    const me = this;
    const meta = me._cachedMeta;
    const dataset = meta.dataset;
    const border = dataset.options && dataset.options.borderWidth || 0;
    const data = meta.data || [];
    if (!data.length) {
      return border;
    }
    const firstPoint = data[0].size(me.resolveDataElementOptions(0));
    const lastPoint = data[data.length - 1].size(me.resolveDataElementOptions(data.length - 1));
    return Math.max(border, firstPoint, lastPoint) / 2;
  }
  draw() {
    const meta = this._cachedMeta;
    meta.dataset.updateControlPoints(this.chart.chartArea, meta.iScale.axis);
    super.draw();
  }
}
LineController.id = 'line';
LineController.defaults = {
  datasetElementType: 'line',
  dataElementType: 'point',
  showLine: true,
  spanGaps: false,
};
LineController.overrides = {
  scales: {
    _index_: {
      type: 'category',
    },
    _value_: {
      type: 'linear',
    },
  }
};
function getStartAndCountOfVisiblePoints(meta, points, animationsDisabled) {
  const pointCount = points.length;
  let start = 0;
  let count = pointCount;
  if (meta._sorted) {
    const {iScale, _parsed} = meta;
    const axis = iScale.axis;
    const {min, max, minDefined, maxDefined} = iScale.getUserBounds();
    if (minDefined) {
      start = _limitValue(Math.min(
        _lookupByKey(_parsed, iScale.axis, min).lo,
        animationsDisabled ? pointCount : _lookupByKey(points, axis, iScale.getPixelForValue(min)).lo),
      0, pointCount - 1);
    }
    if (maxDefined) {
      count = _limitValue(Math.max(
        _lookupByKey(_parsed, iScale.axis, max).hi + 1,
        animationsDisabled ? 0 : _lookupByKey(points, axis, iScale.getPixelForValue(max)).hi + 1),
      start, pointCount) - start;
    } else {
      count = pointCount - start;
    }
  }
  return {start, count};
}
function scaleRangesChanged(meta) {
  const {xScale, yScale, _scaleRanges} = meta;
  const newRanges = {
    xmin: xScale.min,
    xmax: xScale.max,
    ymin: yScale.min,
    ymax: yScale.max
  };
  if (!_scaleRanges) {
    meta._scaleRanges = newRanges;
    return true;
  }
  const changed = _scaleRanges.xmin !== xScale.min
		|| _scaleRanges.xmax !== xScale.max
		|| _scaleRanges.ymin !== yScale.min
		|| _scaleRanges.ymax !== yScale.max;
  Object.assign(_scaleRanges, newRanges);
  return changed;
}

class PolarAreaController extends DatasetController {
  constructor(chart, datasetIndex) {
    super(chart, datasetIndex);
    this.innerRadius = undefined;
    this.outerRadius = undefined;
  }
  getLabelAndValue(index) {
    const me = this;
    const meta = me._cachedMeta;
    const chart = me.chart;
    const labels = chart.data.labels || [];
    const value = formatNumber(meta._parsed[index].r, chart.options.locale);
    return {
      label: labels[index] || '',
      value,
    };
  }
  update(mode) {
    const arcs = this._cachedMeta.data;
    this._updateRadius();
    this.updateElements(arcs, 0, arcs.length, mode);
  }
  _updateRadius() {
    const me = this;
    const chart = me.chart;
    const chartArea = chart.chartArea;
    const opts = chart.options;
    const minSize = Math.min(chartArea.right - chartArea.left, chartArea.bottom - chartArea.top);
    const outerRadius = Math.max(minSize / 2, 0);
    const innerRadius = Math.max(opts.cutoutPercentage ? (outerRadius / 100) * (opts.cutoutPercentage) : 1, 0);
    const radiusLength = (outerRadius - innerRadius) / chart.getVisibleDatasetCount();
    me.outerRadius = outerRadius - (radiusLength * me.index);
    me.innerRadius = me.outerRadius - radiusLength;
  }
  updateElements(arcs, start, count, mode) {
    const me = this;
    const reset = mode === 'reset';
    const chart = me.chart;
    const dataset = me.getDataset();
    const opts = chart.options;
    const animationOpts = opts.animation;
    const scale = me._cachedMeta.rScale;
    const centerX = scale.xCenter;
    const centerY = scale.yCenter;
    const datasetStartAngle = scale.getIndexAngle(0) - 0.5 * PI;
    let angle = datasetStartAngle;
    let i;
    const defaultAngle = 360 / me.countVisibleElements();
    for (i = 0; i < start; ++i) {
      angle += me._computeAngle(i, mode, defaultAngle);
    }
    for (i = start; i < start + count; i++) {
      const arc = arcs[i];
      let startAngle = angle;
      let endAngle = angle + me._computeAngle(i, mode, defaultAngle);
      let outerRadius = chart.getDataVisibility(i) ? scale.getDistanceFromCenterForValue(dataset.data[i]) : 0;
      angle = endAngle;
      if (reset) {
        if (animationOpts.animateScale) {
          outerRadius = 0;
        }
        if (animationOpts.animateRotate) {
          startAngle = endAngle = datasetStartAngle;
        }
      }
      const properties = {
        x: centerX,
        y: centerY,
        innerRadius: 0,
        outerRadius,
        startAngle,
        endAngle,
        options: me.resolveDataElementOptions(i, arc.active ? 'active' : mode)
      };
      me.updateElement(arc, i, properties, mode);
    }
  }
  countVisibleElements() {
    const dataset = this.getDataset();
    const meta = this._cachedMeta;
    let count = 0;
    meta.data.forEach((element, index) => {
      if (!isNaN(dataset.data[index]) && this.chart.getDataVisibility(index)) {
        count++;
      }
    });
    return count;
  }
  _computeAngle(index, mode, defaultAngle) {
    return this.chart.getDataVisibility(index)
      ? toRadians(this.resolveDataElementOptions(index, mode).angle || defaultAngle)
      : 0;
  }
}
PolarAreaController.id = 'polarArea';
PolarAreaController.defaults = {
  dataElementType: 'arc',
  animation: {
    animateRotate: true,
    animateScale: true
  },
  animations: {
    numbers: {
      type: 'number',
      properties: ['x', 'y', 'startAngle', 'endAngle', 'innerRadius', 'outerRadius']
    },
  },
  indexAxis: 'r',
  startAngle: 0,
};
PolarAreaController.overrides = {
  aspectRatio: 1,
  plugins: {
    legend: {
      labels: {
        generateLabels(chart) {
          const data = chart.data;
          if (data.labels.length && data.datasets.length) {
            const {labels: {pointStyle}} = chart.legend.options;
            return data.labels.map((label, i) => {
              const meta = chart.getDatasetMeta(0);
              const style = meta.controller.getStyle(i);
              return {
                text: label,
                fillStyle: style.backgroundColor,
                strokeStyle: style.borderColor,
                lineWidth: style.borderWidth,
                pointStyle: pointStyle,
                hidden: !chart.getDataVisibility(i),
                index: i
              };
            });
          }
          return [];
        }
      },
      onClick(e, legendItem, legend) {
        legend.chart.toggleDataVisibility(legendItem.index);
        legend.chart.update();
      }
    },
    tooltip: {
      callbacks: {
        title() {
          return '';
        },
        label(context) {
          return context.chart.data.labels[context.dataIndex] + ': ' + context.formattedValue;
        }
      }
    }
  },
  scales: {
    r: {
      type: 'radialLinear',
      angleLines: {
        display: false
      },
      beginAtZero: true,
      grid: {
        circular: true
      },
      pointLabels: {
        display: false
      },
      startAngle: 0
    }
  }
};

class PieController extends DoughnutController {
}
PieController.id = 'pie';
PieController.defaults = {
  cutout: 0,
  rotation: 0,
  circumference: 360,
  radius: '100%'
};

class RadarController extends DatasetController {
  getLabelAndValue(index) {
    const me = this;
    const vScale = me._cachedMeta.vScale;
    const parsed = me.getParsed(index);
    return {
      label: vScale.getLabels()[index],
      value: '' + vScale.getLabelForValue(parsed[vScale.axis])
    };
  }
  update(mode) {
    const me = this;
    const meta = me._cachedMeta;
    const line = meta.dataset;
    const points = meta.data || [];
    const labels = meta.iScale.getLabels();
    line.points = points;
    if (mode !== 'resize') {
      const options = me.resolveDatasetElementOptions(mode);
      if (!me.options.showLine) {
        options.borderWidth = 0;
      }
      const properties = {
        _loop: true,
        _fullLoop: labels.length === points.length,
        options
      };
      me.updateElement(line, undefined, properties, mode);
    }
    me.updateElements(points, 0, points.length, mode);
  }
  updateElements(points, start, count, mode) {
    const me = this;
    const dataset = me.getDataset();
    const scale = me._cachedMeta.rScale;
    const reset = mode === 'reset';
    for (let i = start; i < start + count; i++) {
      const point = points[i];
      const options = me.resolveDataElementOptions(i, point.active ? 'active' : mode);
      const pointPosition = scale.getPointPositionForValue(i, dataset.data[i]);
      const x = reset ? scale.xCenter : pointPosition.x;
      const y = reset ? scale.yCenter : pointPosition.y;
      const properties = {
        x,
        y,
        angle: pointPosition.angle,
        skip: isNaN(x) || isNaN(y),
        options
      };
      me.updateElement(point, i, properties, mode);
    }
  }
}
RadarController.id = 'radar';
RadarController.defaults = {
  datasetElementType: 'line',
  dataElementType: 'point',
  indexAxis: 'r',
  showLine: true,
  elements: {
    line: {
      fill: 'start'
    }
  },
};
RadarController.overrides = {
  aspectRatio: 1,
  scales: {
    r: {
      type: 'radialLinear',
    }
  }
};

class ScatterController extends LineController {
}
ScatterController.id = 'scatter';
ScatterController.defaults = {
  showLine: false,
  fill: false
};
ScatterController.overrides = {
  interaction: {
    mode: 'point'
  },
  plugins: {
    tooltip: {
      callbacks: {
        title() {
          return '';
        },
        label(item) {
          return '(' + item.label + ', ' + item.formattedValue + ')';
        }
      }
    }
  },
  scales: {
    x: {
      type: 'linear'
    },
    y: {
      type: 'linear'
    }
  }
};

var controllers = /*#__PURE__*/Object.freeze({
__proto__: null,
BarController: BarController,
BubbleController: BubbleController,
DoughnutController: DoughnutController,
LineController: LineController,
PolarAreaController: PolarAreaController,
PieController: PieController,
RadarController: RadarController,
ScatterController: ScatterController
});

function abstract() {
  throw new Error('This method is not implemented: Check that a complete date adapter is provided.');
}
class DateAdapter {
  constructor(options) {
    this.options = options || {};
  }
  formats() {
    return abstract();
  }
  parse(value, format) {
    return abstract();
  }
  format(timestamp, format) {
    return abstract();
  }
  add(timestamp, amount, unit) {
    return abstract();
  }
  diff(a, b, unit) {
    return abstract();
  }
  startOf(timestamp, unit, weekday) {
    return abstract();
  }
  endOf(timestamp, unit) {
    return abstract();
  }
}
DateAdapter.override = function(members) {
  Object.assign(DateAdapter.prototype, members);
};
var adapters = {
  _date: DateAdapter
};

function getRelativePosition(e, chart) {
  if ('native' in e) {
    return {
      x: e.x,
      y: e.y
    };
  }
  return getRelativePosition$1(e, chart);
}
function evaluateAllVisibleItems(chart, handler) {
  const metasets = chart.getSortedVisibleDatasetMetas();
  let index, data, element;
  for (let i = 0, ilen = metasets.length; i < ilen; ++i) {
    ({index, data} = metasets[i]);
    for (let j = 0, jlen = data.length; j < jlen; ++j) {
      element = data[j];
      if (!element.skip) {
        handler(element, index, j);
      }
    }
  }
}
function binarySearch(metaset, axis, value, intersect) {
  const {controller, data, _sorted} = metaset;
  const iScale = controller._cachedMeta.iScale;
  if (iScale && axis === iScale.axis && _sorted && data.length) {
    const lookupMethod = iScale._reversePixels ? _rlookupByKey : _lookupByKey;
    if (!intersect) {
      return lookupMethod(data, axis, value);
    } else if (controller._sharedOptions) {
      const el = data[0];
      const range = typeof el.getRange === 'function' && el.getRange(axis);
      if (range) {
        const start = lookupMethod(data, axis, value - range);
        const end = lookupMethod(data, axis, value + range);
        return {lo: start.lo, hi: end.hi};
      }
    }
  }
  return {lo: 0, hi: data.length - 1};
}
function optimizedEvaluateItems(chart, axis, position, handler, intersect) {
  const metasets = chart.getSortedVisibleDatasetMetas();
  const value = position[axis];
  for (let i = 0, ilen = metasets.length; i < ilen; ++i) {
    const {index, data} = metasets[i];
    const {lo, hi} = binarySearch(metasets[i], axis, value, intersect);
    for (let j = lo; j <= hi; ++j) {
      const element = data[j];
      if (!element.skip) {
        handler(element, index, j);
      }
    }
  }
}
function getDistanceMetricForAxis(axis) {
  const useX = axis.indexOf('x') !== -1;
  const useY = axis.indexOf('y') !== -1;
  return function(pt1, pt2) {
    const deltaX = useX ? Math.abs(pt1.x - pt2.x) : 0;
    const deltaY = useY ? Math.abs(pt1.y - pt2.y) : 0;
    return Math.sqrt(Math.pow(deltaX, 2) + Math.pow(deltaY, 2));
  };
}
function getIntersectItems(chart, position, axis, useFinalPosition) {
  const items = [];
  if (!_isPointInArea(position, chart.chartArea, chart._minPadding)) {
    return items;
  }
  const evaluationFunc = function(element, datasetIndex, index) {
    if (element.inRange(position.x, position.y, useFinalPosition)) {
      items.push({element, datasetIndex, index});
    }
  };
  optimizedEvaluateItems(chart, axis, position, evaluationFunc, true);
  return items;
}
function getNearestItems(chart, position, axis, intersect, useFinalPosition) {
  const distanceMetric = getDistanceMetricForAxis(axis);
  let minDistance = Number.POSITIVE_INFINITY;
  let items = [];
  if (!_isPointInArea(position, chart.chartArea, chart._minPadding)) {
    return items;
  }
  const evaluationFunc = function(element, datasetIndex, index) {
    if (intersect && !element.inRange(position.x, position.y, useFinalPosition)) {
      return;
    }
    const center = element.getCenterPoint(useFinalPosition);
    if (!_isPointInArea(center, chart.chartArea, chart._minPadding) && !element.inRange(position.x, position.y, useFinalPosition)) {
      return;
    }
    const distance = distanceMetric(position, center);
    if (distance < minDistance) {
      items = [{element, datasetIndex, index}];
      minDistance = distance;
    } else if (distance === minDistance) {
      items.push({element, datasetIndex, index});
    }
  };
  optimizedEvaluateItems(chart, axis, position, evaluationFunc);
  return items;
}
function getAxisItems(chart, e, options, useFinalPosition) {
  const position = getRelativePosition(e, chart);
  const items = [];
  const axis = options.axis;
  const rangeMethod = axis === 'x' ? 'inXRange' : 'inYRange';
  let intersectsItem = false;
  evaluateAllVisibleItems(chart, (element, datasetIndex, index) => {
    if (element[rangeMethod](position[axis], useFinalPosition)) {
      items.push({element, datasetIndex, index});
    }
    if (element.inRange(position.x, position.y, useFinalPosition)) {
      intersectsItem = true;
    }
  });
  if (options.intersect && !intersectsItem) {
    return [];
  }
  return items;
}
var Interaction = {
  modes: {
    index(chart, e, options, useFinalPosition) {
      const position = getRelativePosition(e, chart);
      const axis = options.axis || 'x';
      const items = options.intersect
        ? getIntersectItems(chart, position, axis, useFinalPosition)
        : getNearestItems(chart, position, axis, false, useFinalPosition);
      const elements = [];
      if (!items.length) {
        return [];
      }
      chart.getSortedVisibleDatasetMetas().forEach((meta) => {
        const index = items[0].index;
        const element = meta.data[index];
        if (element && !element.skip) {
          elements.push({element, datasetIndex: meta.index, index});
        }
      });
      return elements;
    },
    dataset(chart, e, options, useFinalPosition) {
      const position = getRelativePosition(e, chart);
      const axis = options.axis || 'xy';
      let items = options.intersect
        ? getIntersectItems(chart, position, axis, useFinalPosition) :
        getNearestItems(chart, position, axis, false, useFinalPosition);
      if (items.length > 0) {
        const datasetIndex = items[0].datasetIndex;
        const data = chart.getDatasetMeta(datasetIndex).data;
        items = [];
        for (let i = 0; i < data.length; ++i) {
          items.push({element: data[i], datasetIndex, index: i});
        }
      }
      return items;
    },
    point(chart, e, options, useFinalPosition) {
      const position = getRelativePosition(e, chart);
      const axis = options.axis || 'xy';
      return getIntersectItems(chart, position, axis, useFinalPosition);
    },
    nearest(chart, e, options, useFinalPosition) {
      const position = getRelativePosition(e, chart);
      const axis = options.axis || 'xy';
      return getNearestItems(chart, position, axis, options.intersect, useFinalPosition);
    },
    x(chart, e, options, useFinalPosition) {
      options.axis = 'x';
      return getAxisItems(chart, e, options, useFinalPosition);
    },
    y(chart, e, options, useFinalPosition) {
      options.axis = 'y';
      return getAxisItems(chart, e, options, useFinalPosition);
    }
  }
};

const STATIC_POSITIONS = ['left', 'top', 'right', 'bottom'];
function filterByPosition(array, position) {
  return array.filter(v => v.pos === position);
}
function filterDynamicPositionByAxis(array, axis) {
  return array.filter(v => STATIC_POSITIONS.indexOf(v.pos) === -1 && v.box.axis === axis);
}
function sortByWeight(array, reverse) {
  return array.sort((a, b) => {
    const v0 = reverse ? b : a;
    const v1 = reverse ? a : b;
    return v0.weight === v1.weight ?
      v0.index - v1.index :
      v0.weight - v1.weight;
  });
}
function wrapBoxes(boxes) {
  const layoutBoxes = [];
  let i, ilen, box, pos, stack, stackWeight;
  for (i = 0, ilen = (boxes || []).length; i < ilen; ++i) {
    box = boxes[i];
    ({position: pos, options: {stack, stackWeight = 1}} = box);
    layoutBoxes.push({
      index: i,
      box,
      pos,
      horizontal: box.isHorizontal(),
      weight: box.weight,
      stack: stack && (pos + stack),
      stackWeight
    });
  }
  return layoutBoxes;
}
function buildStacks(layouts) {
  const stacks = {};
  for (const wrap of layouts) {
    const {stack, pos, stackWeight} = wrap;
    if (!stack || !STATIC_POSITIONS.includes(pos)) {
      continue;
    }
    const _stack = stacks[stack] || (stacks[stack] = {count: 0, placed: 0, weight: 0, size: 0});
    _stack.count++;
    _stack.weight += stackWeight;
  }
  return stacks;
}
function setLayoutDims(layouts, params) {
  const stacks = buildStacks(layouts);
  const {vBoxMaxWidth, hBoxMaxHeight} = params;
  let i, ilen, layout;
  for (i = 0, ilen = layouts.length; i < ilen; ++i) {
    layout = layouts[i];
    const {fullSize} = layout.box;
    const stack = stacks[layout.stack];
    const factor = stack && layout.stackWeight / stack.weight;
    if (layout.horizontal) {
      layout.width = factor ? factor * vBoxMaxWidth : fullSize && params.availableWidth;
      layout.height = hBoxMaxHeight;
    } else {
      layout.width = vBoxMaxWidth;
      layout.height = factor ? factor * hBoxMaxHeight : fullSize && params.availableHeight;
    }
  }
  return stacks;
}
function buildLayoutBoxes(boxes) {
  const layoutBoxes = wrapBoxes(boxes);
  const fullSize = sortByWeight(layoutBoxes.filter(wrap => wrap.box.fullSize), true);
  const left = sortByWeight(filterByPosition(layoutBoxes, 'left'), true);
  const right = sortByWeight(filterByPosition(layoutBoxes, 'right'));
  const top = sortByWeight(filterByPosition(layoutBoxes, 'top'), true);
  const bottom = sortByWeight(filterByPosition(layoutBoxes, 'bottom'));
  const centerHorizontal = filterDynamicPositionByAxis(layoutBoxes, 'x');
  const centerVertical = filterDynamicPositionByAxis(layoutBoxes, 'y');
  return {
    fullSize,
    leftAndTop: left.concat(top),
    rightAndBottom: right.concat(centerVertical).concat(bottom).concat(centerHorizontal),
    chartArea: filterByPosition(layoutBoxes, 'chartArea'),
    vertical: left.concat(right).concat(centerVertical),
    horizontal: top.concat(bottom).concat(centerHorizontal)
  };
}
function getCombinedMax(maxPadding, chartArea, a, b) {
  return Math.max(maxPadding[a], chartArea[a]) + Math.max(maxPadding[b], chartArea[b]);
}
function updateMaxPadding(maxPadding, boxPadding) {
  maxPadding.top = Math.max(maxPadding.top, boxPadding.top);
  maxPadding.left = Math.max(maxPadding.left, boxPadding.left);
  maxPadding.bottom = Math.max(maxPadding.bottom, boxPadding.bottom);
  maxPadding.right = Math.max(maxPadding.right, boxPadding.right);
}
function updateDims(chartArea, params, layout, stacks) {
  const {pos, box} = layout;
  const maxPadding = chartArea.maxPadding;
  if (!isObject(pos)) {
    if (layout.size) {
      chartArea[pos] -= layout.size;
    }
    const stack = stacks[layout.stack] || {size: 0, count: 1};
    stack.size = Math.max(stack.size, layout.horizontal ? box.height : box.width);
    layout.size = stack.size / stack.count;
    chartArea[pos] += layout.size;
  }
  if (box.getPadding) {
    updateMaxPadding(maxPadding, box.getPadding());
  }
  const newWidth = Math.max(0, params.outerWidth - getCombinedMax(maxPadding, chartArea, 'left', 'right'));
  const newHeight = Math.max(0, params.outerHeight - getCombinedMax(maxPadding, chartArea, 'top', 'bottom'));
  const widthChanged = newWidth !== chartArea.w;
  const heightChanged = newHeight !== chartArea.h;
  chartArea.w = newWidth;
  chartArea.h = newHeight;
  return layout.horizontal
    ? {same: widthChanged, other: heightChanged}
    : {same: heightChanged, other: widthChanged};
}
function handleMaxPadding(chartArea) {
  const maxPadding = chartArea.maxPadding;
  function updatePos(pos) {
    const change = Math.max(maxPadding[pos] - chartArea[pos], 0);
    chartArea[pos] += change;
    return change;
  }
  chartArea.y += updatePos('top');
  chartArea.x += updatePos('left');
  updatePos('right');
  updatePos('bottom');
}
function getMargins(horizontal, chartArea) {
  const maxPadding = chartArea.maxPadding;
  function marginForPositions(positions) {
    const margin = {left: 0, top: 0, right: 0, bottom: 0};
    positions.forEach((pos) => {
      margin[pos] = Math.max(chartArea[pos], maxPadding[pos]);
    });
    return margin;
  }
  return horizontal
    ? marginForPositions(['left', 'right'])
    : marginForPositions(['top', 'bottom']);
}
function fitBoxes(boxes, chartArea, params, stacks) {
  const refitBoxes = [];
  let i, ilen, layout, box, refit, changed;
  for (i = 0, ilen = boxes.length, refit = 0; i < ilen; ++i) {
    layout = boxes[i];
    box = layout.box;
    box.update(
      layout.width || chartArea.w,
      layout.height || chartArea.h,
      getMargins(layout.horizontal, chartArea)
    );
    const {same, other} = updateDims(chartArea, params, layout, stacks);
    refit |= same && refitBoxes.length;
    changed = changed || other;
    if (!box.fullSize) {
      refitBoxes.push(layout);
    }
  }
  return refit && fitBoxes(refitBoxes, chartArea, params, stacks) || changed;
}
function setBoxDims(box, left, top, width, height) {
  box.top = top;
  box.left = left;
  box.right = left + width;
  box.bottom = top + height;
  box.width = width;
  box.height = height;
}
function placeBoxes(boxes, chartArea, params, stacks) {
  const userPadding = params.padding;
  let {x, y} = chartArea;
  for (const layout of boxes) {
    const box = layout.box;
    const stack = stacks[layout.stack] || {count: 1, placed: 0, weight: 1};
    const weight = (layout.stackWeight / stack.weight) || 1;
    if (layout.horizontal) {
      const width = chartArea.w * weight;
      const height = stack.size || box.height;
      if (defined(stack.start)) {
        y = stack.start;
      }
      if (box.fullSize) {
        setBoxDims(box, userPadding.left, y, params.outerWidth - userPadding.right - userPadding.left, height);
      } else {
        setBoxDims(box, chartArea.left + stack.placed, y, width, height);
      }
      stack.start = y;
      stack.placed += width;
      y = box.bottom;
    } else {
      const height = chartArea.h * weight;
      const width = stack.size || box.width;
      if (defined(stack.start)) {
        x = stack.start;
      }
      if (box.fullSize) {
        setBoxDims(box, x, userPadding.top, width, params.outerHeight - userPadding.bottom - userPadding.top);
      } else {
        setBoxDims(box, x, chartArea.top + stack.placed, width, height);
      }
      stack.start = x;
      stack.placed += height;
      x = box.right;
    }
  }
  chartArea.x = x;
  chartArea.y = y;
}
defaults.set('layout', {
  padding: {
    top: 0,
    right: 0,
    bottom: 0,
    left: 0
  }
});
var layouts = {
  addBox(chart, item) {
    if (!chart.boxes) {
      chart.boxes = [];
    }
    item.fullSize = item.fullSize || false;
    item.position = item.position || 'top';
    item.weight = item.weight || 0;
    item._layers = item._layers || function() {
      return [{
        z: 0,
        draw(chartArea) {
          item.draw(chartArea);
        }
      }];
    };
    chart.boxes.push(item);
  },
  removeBox(chart, layoutItem) {
    const index = chart.boxes ? chart.boxes.indexOf(layoutItem) : -1;
    if (index !== -1) {
      chart.boxes.splice(index, 1);
    }
  },
  configure(chart, item, options) {
    item.fullSize = options.fullSize;
    item.position = options.position;
    item.weight = options.weight;
  },
  update(chart, width, height, minPadding) {
    if (!chart) {
      return;
    }
    const padding = toPadding(chart.options.layout.padding);
    const availableWidth = Math.max(width - padding.width, 0);
    const availableHeight = Math.max(height - padding.height, 0);
    const boxes = buildLayoutBoxes(chart.boxes);
    const verticalBoxes = boxes.vertical;
    const horizontalBoxes = boxes.horizontal;
    each(chart.boxes, box => {
      if (typeof box.beforeLayout === 'function') {
        box.beforeLayout();
      }
    });
    const visibleVerticalBoxCount = verticalBoxes.reduce((total, wrap) =>
      wrap.box.options && wrap.box.options.display === false ? total : total + 1, 0) || 1;
    const params = Object.freeze({
      outerWidth: width,
      outerHeight: height,
      padding,
      availableWidth,
      availableHeight,
      vBoxMaxWidth: availableWidth / 2 / visibleVerticalBoxCount,
      hBoxMaxHeight: availableHeight / 2
    });
    const maxPadding = Object.assign({}, padding);
    updateMaxPadding(maxPadding, toPadding(minPadding));
    const chartArea = Object.assign({
      maxPadding,
      w: availableWidth,
      h: availableHeight,
      x: padding.left,
      y: padding.top
    }, padding);
    const stacks = setLayoutDims(verticalBoxes.concat(horizontalBoxes), params);
    fitBoxes(boxes.fullSize, chartArea, params, stacks);
    fitBoxes(verticalBoxes, chartArea, params, stacks);
    if (fitBoxes(horizontalBoxes, chartArea, params, stacks)) {
      fitBoxes(verticalBoxes, chartArea, params, stacks);
    }
    handleMaxPadding(chartArea);
    placeBoxes(boxes.leftAndTop, chartArea, params, stacks);
    chartArea.x += chartArea.w;
    chartArea.y += chartArea.h;
    placeBoxes(boxes.rightAndBottom, chartArea, params, stacks);
    chart.chartArea = {
      left: chartArea.left,
      top: chartArea.top,
      right: chartArea.left + chartArea.w,
      bottom: chartArea.top + chartArea.h,
      height: chartArea.h,
      width: chartArea.w,
    };
    each(boxes.chartArea, (layout) => {
      const box = layout.box;
      Object.assign(box, chart.chartArea);
      box.update(chartArea.w, chartArea.h);
    });
  }
};

class BasePlatform {
  acquireContext(canvas, aspectRatio) {}
  releaseContext(context) {
    return false;
  }
  addEventListener(chart, type, listener) {}
  removeEventListener(chart, type, listener) {}
  getDevicePixelRatio() {
    return 1;
  }
  getMaximumSize(element, width, height, aspectRatio) {
    width = Math.max(0, width || element.width);
    height = height || element.height;
    return {
      width,
      height: Math.max(0, aspectRatio ? Math.floor(width / aspectRatio) : height)
    };
  }
  isAttached(canvas) {
    return true;
  }
}

class BasicPlatform extends BasePlatform {
  acquireContext(item) {
    return item && item.getContext && item.getContext('2d') || null;
  }
}

const EXPANDO_KEY = '$chartjs';
const EVENT_TYPES = {
  touchstart: 'mousedown',
  touchmove: 'mousemove',
  touchend: 'mouseup',
  pointerenter: 'mouseenter',
  pointerdown: 'mousedown',
  pointermove: 'mousemove',
  pointerup: 'mouseup',
  pointerleave: 'mouseout',
  pointerout: 'mouseout'
};
const isNullOrEmpty = value => value === null || value === '';
function initCanvas(canvas, aspectRatio) {
  const style = canvas.style;
  const renderHeight = canvas.getAttribute('height');
  const renderWidth = canvas.getAttribute('width');
  canvas[EXPANDO_KEY] = {
    initial: {
      height: renderHeight,
      width: renderWidth,
      style: {
        display: style.display,
        height: style.height,
        width: style.width
      }
    }
  };
  style.display = style.display || 'block';
  style.boxSizing = style.boxSizing || 'border-box';
  if (isNullOrEmpty(renderWidth)) {
    const displayWidth = readUsedSize(canvas, 'width');
    if (displayWidth !== undefined) {
      canvas.width = displayWidth;
    }
  }
  if (isNullOrEmpty(renderHeight)) {
    if (canvas.style.height === '') {
      canvas.height = canvas.width / (aspectRatio || 2);
    } else {
      const displayHeight = readUsedSize(canvas, 'height');
      if (displayHeight !== undefined) {
        canvas.height = displayHeight;
      }
    }
  }
  return canvas;
}
const eventListenerOptions = supportsEventListenerOptions ? {passive: true} : false;
function addListener(node, type, listener) {
  node.addEventListener(type, listener, eventListenerOptions);
}
function removeListener(chart, type, listener) {
  chart.canvas.removeEventListener(type, listener, eventListenerOptions);
}
function fromNativeEvent(event, chart) {
  const type = EVENT_TYPES[event.type] || event.type;
  const {x, y} = getRelativePosition$1(event, chart);
  return {
    type,
    chart,
    native: event,
    x: x !== undefined ? x : null,
    y: y !== undefined ? y : null,
  };
}
function createAttachObserver(chart, type, listener) {
  const canvas = chart.canvas;
  const container = canvas && _getParentNode(canvas);
  const element = container || canvas;
  const observer = new MutationObserver(entries => {
    const parent = _getParentNode(element);
    entries.forEach(entry => {
      for (let i = 0; i < entry.addedNodes.length; i++) {
        const added = entry.addedNodes[i];
        if (added === element || added === parent) {
          listener(entry.target);
        }
      }
    });
  });
  observer.observe(document, {childList: true, subtree: true});
  return observer;
}
function createDetachObserver(chart, type, listener) {
  const canvas = chart.canvas;
  const container = canvas && _getParentNode(canvas);
  if (!container) {
    return;
  }
  const observer = new MutationObserver(entries => {
    entries.forEach(entry => {
      for (let i = 0; i < entry.removedNodes.length; i++) {
        if (entry.removedNodes[i] === canvas) {
          listener();
          break;
        }
      }
    });
  });
  observer.observe(container, {childList: true});
  return observer;
}
const drpListeningCharts = new Map();
let oldDevicePixelRatio = 0;
function onWindowResize() {
  const dpr = window.devicePixelRatio;
  if (dpr === oldDevicePixelRatio) {
    return;
  }
  oldDevicePixelRatio = dpr;
  drpListeningCharts.forEach((resize, chart) => {
    if (chart.currentDevicePixelRatio !== dpr) {
      resize();
    }
  });
}
function listenDevicePixelRatioChanges(chart, resize) {
  if (!drpListeningCharts.size) {
    window.addEventListener('resize', onWindowResize);
  }
  drpListeningCharts.set(chart, resize);
}
function unlistenDevicePixelRatioChanges(chart) {
  drpListeningCharts.delete(chart);
  if (!drpListeningCharts.size) {
    window.removeEventListener('resize', onWindowResize);
  }
}
function createResizeObserver(chart, type, listener) {
  const canvas = chart.canvas;
  const container = canvas && _getParentNode(canvas);
  if (!container) {
    return;
  }
  const resize = throttled((width, height) => {
    const w = container.clientWidth;
    listener(width, height);
    if (w < container.clientWidth) {
      listener();
    }
  }, window);
  const observer = new ResizeObserver(entries => {
    const entry = entries[0];
    const width = entry.contentRect.width;
    const height = entry.contentRect.height;
    if (width === 0 && height === 0) {
      return;
    }
    resize(width, height);
  });
  observer.observe(container);
  listenDevicePixelRatioChanges(chart, resize);
  return observer;
}
function releaseObserver(chart, type, observer) {
  if (observer) {
    observer.disconnect();
  }
  if (type === 'resize') {
    unlistenDevicePixelRatioChanges(chart);
  }
}
function createProxyAndListen(chart, type, listener) {
  const canvas = chart.canvas;
  const proxy = throttled((event) => {
    if (chart.ctx !== null) {
      listener(fromNativeEvent(event, chart));
    }
  }, chart, (args) => {
    const event = args[0];
    return [event, event.offsetX, event.offsetY];
  });
  addListener(canvas, type, proxy);
  return proxy;
}
class DomPlatform extends BasePlatform {
  acquireContext(canvas, aspectRatio) {
    const context = canvas && canvas.getContext && canvas.getContext('2d');
    if (context && context.canvas === canvas) {
      initCanvas(canvas, aspectRatio);
      return context;
    }
    return null;
  }
  releaseContext(context) {
    const canvas = context.canvas;
    if (!canvas[EXPANDO_KEY]) {
      return false;
    }
    const initial = canvas[EXPANDO_KEY].initial;
    ['height', 'width'].forEach((prop) => {
      const value = initial[prop];
      if (isNullOrUndef(value)) {
        canvas.removeAttribute(prop);
      } else {
        canvas.setAttribute(prop, value);
      }
    });
    const style = initial.style || {};
    Object.keys(style).forEach((key) => {
      canvas.style[key] = style[key];
    });
    canvas.width = canvas.width;
    delete canvas[EXPANDO_KEY];
    return true;
  }
  addEventListener(chart, type, listener) {
    this.removeEventListener(chart, type);
    const proxies = chart.$proxies || (chart.$proxies = {});
    const handlers = {
      attach: createAttachObserver,
      detach: createDetachObserver,
      resize: createResizeObserver
    };
    const handler = handlers[type] || createProxyAndListen;
    proxies[type] = handler(chart, type, listener);
  }
  removeEventListener(chart, type) {
    const proxies = chart.$proxies || (chart.$proxies = {});
    const proxy = proxies[type];
    if (!proxy) {
      return;
    }
    const handlers = {
      attach: releaseObserver,
      detach: releaseObserver,
      resize: releaseObserver
    };
    const handler = handlers[type] || removeListener;
    handler(chart, type, proxy);
    proxies[type] = undefined;
  }
  getDevicePixelRatio() {
    return window.devicePixelRatio;
  }
  getMaximumSize(canvas, width, height, aspectRatio) {
    return getMaximumSize(canvas, width, height, aspectRatio);
  }
  isAttached(canvas) {
    const container = _getParentNode(canvas);
    return !!(container && container.isConnected);
  }
}

function _detectPlatform(canvas) {
  if (!_isDomSupported() || (typeof OffscreenCanvas !== 'undefined' && canvas instanceof OffscreenCanvas)) {
    return BasicPlatform;
  }
  return DomPlatform;
}

class Element {
  constructor() {
    this.x = undefined;
    this.y = undefined;
    this.active = false;
    this.options = undefined;
    this.$animations = undefined;
  }
  tooltipPosition(useFinalPosition) {
    const {x, y} = this.getProps(['x', 'y'], useFinalPosition);
    return {x, y};
  }
  hasValue() {
    return isNumber(this.x) && isNumber(this.y);
  }
  getProps(props, final) {
    const me = this;
    const anims = this.$animations;
    if (!final || !anims) {
      return me;
    }
    const ret = {};
    props.forEach(prop => {
      ret[prop] = anims[prop] && anims[prop].active() ? anims[prop]._to : me[prop];
    });
    return ret;
  }
}
Element.defaults = {};
Element.defaultRoutes = undefined;

const formatters = {
  values(value) {
    return isArray(value) ? value : '' + value;
  },
  numeric(tickValue, index, ticks) {
    if (tickValue === 0) {
      return '0';
    }
    const locale = this.chart.options.locale;
    let notation;
    let delta = tickValue;
    if (ticks.length > 1) {
      const maxTick = Math.max(Math.abs(ticks[0].value), Math.abs(ticks[ticks.length - 1].value));
      if (maxTick < 1e-4 || maxTick > 1e+15) {
        notation = 'scientific';
      }
      delta = calculateDelta(tickValue, ticks);
    }
    const logDelta = log10(Math.abs(delta));
    const numDecimal = Math.max(Math.min(-1 * Math.floor(logDelta), 20), 0);
    const options = {notation, minimumFractionDigits: numDecimal, maximumFractionDigits: numDecimal};
    Object.assign(options, this.options.ticks.format);
    return formatNumber(tickValue, locale, options);
  },
  logarithmic(tickValue, index, ticks) {
    if (tickValue === 0) {
      return '0';
    }
    const remain = tickValue / (Math.pow(10, Math.floor(log10(tickValue))));
    if (remain === 1 || remain === 2 || remain === 5) {
      return formatters.numeric.call(this, tickValue, index, ticks);
    }
    return '';
  }
};
function calculateDelta(tickValue, ticks) {
  let delta = ticks.length > 3 ? ticks[2].value - ticks[1].value : ticks[1].value - ticks[0].value;
  if (Math.abs(delta) >= 1 && tickValue !== Math.floor(tickValue)) {
    delta = tickValue - Math.floor(tickValue);
  }
  return delta;
}
var Ticks = {formatters};

defaults.set('scale', {
  display: true,
  offset: false,
  reverse: false,
  beginAtZero: false,
  bounds: 'ticks',
  grace: 0,
  grid: {
    display: true,
    lineWidth: 1,
    drawBorder: true,
    drawOnChartArea: true,
    drawTicks: true,
    tickLength: 8,
    tickWidth: (_ctx, options) => options.lineWidth,
    tickColor: (_ctx, options) => options.color,
    offset: false,
    borderDash: [],
    borderDashOffset: 0.0,
    borderWidth: 1
  },
  title: {
    display: false,
    text: '',
    padding: {
      top: 4,
      bottom: 4
    }
  },
  ticks: {
    minRotation: 0,
    maxRotation: 50,
    mirror: false,
    textStrokeWidth: 0,
    textStrokeColor: '',
    padding: 3,
    display: true,
    autoSkip: true,
    autoSkipPadding: 3,
    labelOffset: 0,
    callback: Ticks.formatters.values,
    minor: {},
    major: {},
    align: 'center',
    crossAlign: 'near',
    showLabelBackdrop: false,
    backdropColor: 'rgba(255, 255, 255, 0.75)',
    backdropPadding: 2,
  }
});
defaults.route('scale.ticks', 'color', '', 'color');
defaults.route('scale.grid', 'color', '', 'borderColor');
defaults.route('scale.grid', 'borderColor', '', 'borderColor');
defaults.route('scale.title', 'color', '', 'color');
defaults.describe('scale', {
  _fallback: false,
  _scriptable: (name) => !name.startsWith('before') && !name.startsWith('after') && name !== 'callback' && name !== 'parser',
  _indexable: (name) => name !== 'borderDash' && name !== 'tickBorderDash',
});
defaults.describe('scales', {
  _fallback: 'scale',
});
defaults.describe('scale.ticks', {
  _scriptable: (name) => name !== 'backdropPadding' && name !== 'callback',
  _indexable: (name) => name !== 'backdropPadding',
});

function autoSkip(scale, ticks) {
  const tickOpts = scale.options.ticks;
  const ticksLimit = tickOpts.maxTicksLimit || determineMaxTicks(scale);
  const majorIndices = tickOpts.major.enabled ? getMajorIndices(ticks) : [];
  const numMajorIndices = majorIndices.length;
  const first = majorIndices[0];
  const last = majorIndices[numMajorIndices - 1];
  const newTicks = [];
  if (numMajorIndices > ticksLimit) {
    skipMajors(ticks, newTicks, majorIndices, numMajorIndices / ticksLimit);
    return newTicks;
  }
  const spacing = calculateSpacing(majorIndices, ticks, ticksLimit);
  if (numMajorIndices > 0) {
    let i, ilen;
    const avgMajorSpacing = numMajorIndices > 1 ? Math.round((last - first) / (numMajorIndices - 1)) : null;
    skip(ticks, newTicks, spacing, isNullOrUndef(avgMajorSpacing) ? 0 : first - avgMajorSpacing, first);
    for (i = 0, ilen = numMajorIndices - 1; i < ilen; i++) {
      skip(ticks, newTicks, spacing, majorIndices[i], majorIndices[i + 1]);
    }
    skip(ticks, newTicks, spacing, last, isNullOrUndef(avgMajorSpacing) ? ticks.length : last + avgMajorSpacing);
    return newTicks;
  }
  skip(ticks, newTicks, spacing);
  return newTicks;
}
function determineMaxTicks(scale) {
  const offset = scale.options.offset;
  const tickLength = scale._tickSize();
  const maxScale = scale._length / tickLength + (offset ? 0 : 1);
  const maxChart = scale._maxLength / tickLength;
  return Math.floor(Math.min(maxScale, maxChart));
}
function calculateSpacing(majorIndices, ticks, ticksLimit) {
  const evenMajorSpacing = getEvenSpacing(majorIndices);
  const spacing = ticks.length / ticksLimit;
  if (!evenMajorSpacing) {
    return Math.max(spacing, 1);
  }
  const factors = _factorize(evenMajorSpacing);
  for (let i = 0, ilen = factors.length - 1; i < ilen; i++) {
    const factor = factors[i];
    if (factor > spacing) {
      return factor;
    }
  }
  return Math.max(spacing, 1);
}
function getMajorIndices(ticks) {
  const result = [];
  let i, ilen;
  for (i = 0, ilen = ticks.length; i < ilen; i++) {
    if (ticks[i].major) {
      result.push(i);
    }
  }
  return result;
}
function skipMajors(ticks, newTicks, majorIndices, spacing) {
  let count = 0;
  let next = majorIndices[0];
  let i;
  spacing = Math.ceil(spacing);
  for (i = 0; i < ticks.length; i++) {
    if (i === next) {
      newTicks.push(ticks[i]);
      count++;
      next = majorIndices[count * spacing];
    }
  }
}
function skip(ticks, newTicks, spacing, majorStart, majorEnd) {
  const start = valueOrDefault(majorStart, 0);
  const end = Math.min(valueOrDefault(majorEnd, ticks.length), ticks.length);
  let count = 0;
  let length, i, next;
  spacing = Math.ceil(spacing);
  if (majorEnd) {
    length = majorEnd - majorStart;
    spacing = length / Math.floor(length / spacing);
  }
  next = start;
  while (next < 0) {
    count++;
    next = Math.round(start + count * spacing);
  }
  for (i = Math.max(start, 0); i < end; i++) {
    if (i === next) {
      newTicks.push(ticks[i]);
      count++;
      next = Math.round(start + count * spacing);
    }
  }
}
function getEvenSpacing(arr) {
  const len = arr.length;
  let i, diff;
  if (len < 2) {
    return false;
  }
  for (diff = arr[0], i = 1; i < len; ++i) {
    if (arr[i] - arr[i - 1] !== diff) {
      return false;
    }
  }
  return diff;
}

const reverseAlign = (align) => align === 'left' ? 'right' : align === 'right' ? 'left' : align;
const offsetFromEdge = (scale, edge, offset) => edge === 'top' || edge === 'left' ? scale[edge] + offset : scale[edge] - offset;
function sample(arr, numItems) {
  const result = [];
  const increment = arr.length / numItems;
  const len = arr.length;
  let i = 0;
  for (; i < len; i += increment) {
    result.push(arr[Math.floor(i)]);
  }
  return result;
}
function getPixelForGridLine(scale, index, offsetGridLines) {
  const length = scale.ticks.length;
  const validIndex = Math.min(index, length - 1);
  const start = scale._startPixel;
  const end = scale._endPixel;
  const epsilon = 1e-6;
  let lineValue = scale.getPixelForTick(validIndex);
  let offset;
  if (offsetGridLines) {
    if (length === 1) {
      offset = Math.max(lineValue - start, end - lineValue);
    } else if (index === 0) {
      offset = (scale.getPixelForTick(1) - lineValue) / 2;
    } else {
      offset = (lineValue - scale.getPixelForTick(validIndex - 1)) / 2;
    }
    lineValue += validIndex < index ? offset : -offset;
    if (lineValue < start - epsilon || lineValue > end + epsilon) {
      return;
    }
  }
  return lineValue;
}
function garbageCollect(caches, length) {
  each(caches, (cache) => {
    const gc = cache.gc;
    const gcLen = gc.length / 2;
    let i;
    if (gcLen > length) {
      for (i = 0; i < gcLen; ++i) {
        delete cache.data[gc[i]];
      }
      gc.splice(0, gcLen);
    }
  });
}
function getTickMarkLength(options) {
  return options.drawTicks ? options.tickLength : 0;
}
function getTitleHeight(options, fallback) {
  if (!options.display) {
    return 0;
  }
  const font = toFont(options.font, fallback);
  const padding = toPadding(options.padding);
  const lines = isArray(options.text) ? options.text.length : 1;
  return (lines * font.lineHeight) + padding.height;
}
function createScaleContext(parent, scale) {
  return Object.assign(Object.create(parent), {
    scale,
    type: 'scale'
  });
}
function createTickContext(parent, index, tick) {
  return Object.assign(Object.create(parent), {
    tick,
    index,
    type: 'tick'
  });
}
function titleAlign(align, position, reverse) {
  let ret = _toLeftRightCenter(align);
  if ((reverse && position !== 'right') || (!reverse && position === 'right')) {
    ret = reverseAlign(ret);
  }
  return ret;
}
function titleArgs(scale, offset, position, align) {
  const {top, left, bottom, right, chart} = scale;
  const {chartArea, scales} = chart;
  let rotation = 0;
  let maxWidth, titleX, titleY;
  const height = bottom - top;
  const width = right - left;
  if (scale.isHorizontal()) {
    titleX = _alignStartEnd(align, left, right);
    if (isObject(position)) {
      const positionAxisID = Object.keys(position)[0];
      const value = position[positionAxisID];
      titleY = scales[positionAxisID].getPixelForValue(value) + height - offset;
    } else if (position === 'center') {
      titleY = (chartArea.bottom + chartArea.top) / 2 + height - offset;
    } else {
      titleY = offsetFromEdge(scale, position, offset);
    }
    maxWidth = right - left;
  } else {
    if (isObject(position)) {
      const positionAxisID = Object.keys(position)[0];
      const value = position[positionAxisID];
      titleX = scales[positionAxisID].getPixelForValue(value) - width + offset;
    } else if (position === 'center') {
      titleX = (chartArea.left + chartArea.right) / 2 - width + offset;
    } else {
      titleX = offsetFromEdge(scale, position, offset);
    }
    titleY = _alignStartEnd(align, bottom, top);
    rotation = position === 'left' ? -HALF_PI : HALF_PI;
  }
  return {titleX, titleY, maxWidth, rotation};
}
class Scale extends Element {
  constructor(cfg) {
    super();
    this.id = cfg.id;
    this.type = cfg.type;
    this.options = undefined;
    this.ctx = cfg.ctx;
    this.chart = cfg.chart;
    this.top = undefined;
    this.bottom = undefined;
    this.left = undefined;
    this.right = undefined;
    this.width = undefined;
    this.height = undefined;
    this._margins = {
      left: 0,
      right: 0,
      top: 0,
      bottom: 0
    };
    this.maxWidth = undefined;
    this.maxHeight = undefined;
    this.paddingTop = undefined;
    this.paddingBottom = undefined;
    this.paddingLeft = undefined;
    this.paddingRight = undefined;
    this.axis = undefined;
    this.labelRotation = undefined;
    this.min = undefined;
    this.max = undefined;
    this._range = undefined;
    this.ticks = [];
    this._gridLineItems = null;
    this._labelItems = null;
    this._labelSizes = null;
    this._length = 0;
    this._maxLength = 0;
    this._longestTextCache = {};
    this._startPixel = undefined;
    this._endPixel = undefined;
    this._reversePixels = false;
    this._userMax = undefined;
    this._userMin = undefined;
    this._suggestedMax = undefined;
    this._suggestedMin = undefined;
    this._ticksLength = 0;
    this._borderValue = 0;
    this._cache = {};
    this._dataLimitsCached = false;
    this.$context = undefined;
  }
  init(options) {
    const me = this;
    me.options = options.setContext(me.getContext());
    me.axis = options.axis;
    me._userMin = me.parse(options.min);
    me._userMax = me.parse(options.max);
    me._suggestedMin = me.parse(options.suggestedMin);
    me._suggestedMax = me.parse(options.suggestedMax);
  }
  parse(raw, index) {
    return raw;
  }
  getUserBounds() {
    let {_userMin, _userMax, _suggestedMin, _suggestedMax} = this;
    _userMin = finiteOrDefault(_userMin, Number.POSITIVE_INFINITY);
    _userMax = finiteOrDefault(_userMax, Number.NEGATIVE_INFINITY);
    _suggestedMin = finiteOrDefault(_suggestedMin, Number.POSITIVE_INFINITY);
    _suggestedMax = finiteOrDefault(_suggestedMax, Number.NEGATIVE_INFINITY);
    return {
      min: finiteOrDefault(_userMin, _suggestedMin),
      max: finiteOrDefault(_userMax, _suggestedMax),
      minDefined: isNumberFinite(_userMin),
      maxDefined: isNumberFinite(_userMax)
    };
  }
  getMinMax(canStack) {
    const me = this;
    let {min, max, minDefined, maxDefined} = me.getUserBounds();
    let range;
    if (minDefined && maxDefined) {
      return {min, max};
    }
    const metas = me.getMatchingVisibleMetas();
    for (let i = 0, ilen = metas.length; i < ilen; ++i) {
      range = metas[i].controller.getMinMax(me, canStack);
      if (!minDefined) {
        min = Math.min(min, range.min);
      }
      if (!maxDefined) {
        max = Math.max(max, range.max);
      }
    }
    return {
      min: finiteOrDefault(min, finiteOrDefault(max, min)),
      max: finiteOrDefault(max, finiteOrDefault(min, max))
    };
  }
  getPadding() {
    const me = this;
    return {
      left: me.paddingLeft || 0,
      top: me.paddingTop || 0,
      right: me.paddingRight || 0,
      bottom: me.paddingBottom || 0
    };
  }
  getTicks() {
    return this.ticks;
  }
  getLabels() {
    const data = this.chart.data;
    return this.options.labels || (this.isHorizontal() ? data.xLabels : data.yLabels) || data.labels || [];
  }
  beforeLayout() {
    this._cache = {};
    this._dataLimitsCached = false;
  }
  beforeUpdate() {
    callback(this.options.beforeUpdate, [this]);
  }
  update(maxWidth, maxHeight, margins) {
    const me = this;
    const tickOpts = me.options.ticks;
    const sampleSize = tickOpts.sampleSize;
    me.beforeUpdate();
    me.maxWidth = maxWidth;
    me.maxHeight = maxHeight;
    me._margins = margins = Object.assign({
      left: 0,
      right: 0,
      top: 0,
      bottom: 0
    }, margins);
    me.ticks = null;
    me._labelSizes = null;
    me._gridLineItems = null;
    me._labelItems = null;
    me.beforeSetDimensions();
    me.setDimensions();
    me.afterSetDimensions();
    me._maxLength = me.isHorizontal()
      ? me.width + margins.left + margins.right
      : me.height + margins.top + margins.bottom;
    if (!me._dataLimitsCached) {
      me.beforeDataLimits();
      me.determineDataLimits();
      me.afterDataLimits();
      me._range = _addGrace(me, me.options.grace);
      me._dataLimitsCached = true;
    }
    me.beforeBuildTicks();
    me.ticks = me.buildTicks() || [];
    me.afterBuildTicks();
    const samplingEnabled = sampleSize < me.ticks.length;
    me._convertTicksToLabels(samplingEnabled ? sample(me.ticks, sampleSize) : me.ticks);
    me.configure();
    me.beforeCalculateLabelRotation();
    me.calculateLabelRotation();
    me.afterCalculateLabelRotation();
    if (tickOpts.display && (tickOpts.autoSkip || tickOpts.source === 'auto')) {
      me.ticks = autoSkip(me, me.ticks);
      me._labelSizes = null;
    }
    if (samplingEnabled) {
      me._convertTicksToLabels(me.ticks);
    }
    me.beforeFit();
    me.fit();
    me.afterFit();
    me.afterUpdate();
  }
  configure() {
    const me = this;
    let reversePixels = me.options.reverse;
    let startPixel, endPixel;
    if (me.isHorizontal()) {
      startPixel = me.left;
      endPixel = me.right;
    } else {
      startPixel = me.top;
      endPixel = me.bottom;
      reversePixels = !reversePixels;
    }
    me._startPixel = startPixel;
    me._endPixel = endPixel;
    me._reversePixels = reversePixels;
    me._length = endPixel - startPixel;
    me._alignToPixels = me.options.alignToPixels;
  }
  afterUpdate() {
    callback(this.options.afterUpdate, [this]);
  }
  beforeSetDimensions() {
    callback(this.options.beforeSetDimensions, [this]);
  }
  setDimensions() {
    const me = this;
    if (me.isHorizontal()) {
      me.width = me.maxWidth;
      me.left = 0;
      me.right = me.width;
    } else {
      me.height = me.maxHeight;
      me.top = 0;
      me.bottom = me.height;
    }
    me.paddingLeft = 0;
    me.paddingTop = 0;
    me.paddingRight = 0;
    me.paddingBottom = 0;
  }
  afterSetDimensions() {
    callback(this.options.afterSetDimensions, [this]);
  }
  _callHooks(name) {
    const me = this;
    me.chart.notifyPlugins(name, me.getContext());
    callback(me.options[name], [me]);
  }
  beforeDataLimits() {
    this._callHooks('beforeDataLimits');
  }
  determineDataLimits() {}
  afterDataLimits() {
    this._callHooks('afterDataLimits');
  }
  beforeBuildTicks() {
    this._callHooks('beforeBuildTicks');
  }
  buildTicks() {
    return [];
  }
  afterBuildTicks() {
    this._callHooks('afterBuildTicks');
  }
  beforeTickToLabelConversion() {
    callback(this.options.beforeTickToLabelConversion, [this]);
  }
  generateTickLabels(ticks) {
    const me = this;
    const tickOpts = me.options.ticks;
    let i, ilen, tick;
    for (i = 0, ilen = ticks.length; i < ilen; i++) {
      tick = ticks[i];
      tick.label = callback(tickOpts.callback, [tick.value, i, ticks], me);
    }
  }
  afterTickToLabelConversion() {
    callback(this.options.afterTickToLabelConversion, [this]);
  }
  beforeCalculateLabelRotation() {
    callback(this.options.beforeCalculateLabelRotation, [this]);
  }
  calculateLabelRotation() {
    const me = this;
    const options = me.options;
    const tickOpts = options.ticks;
    const numTicks = me.ticks.length;
    const minRotation = tickOpts.minRotation || 0;
    const maxRotation = tickOpts.maxRotation;
    let labelRotation = minRotation;
    let tickWidth, maxHeight, maxLabelDiagonal;
    if (!me._isVisible() || !tickOpts.display || minRotation >= maxRotation || numTicks <= 1 || !me.isHorizontal()) {
      me.labelRotation = minRotation;
      return;
    }
    const labelSizes = me._getLabelSizes();
    const maxLabelWidth = labelSizes.widest.width;
    const maxLabelHeight = labelSizes.highest.height;
    const maxWidth = _limitValue(me.chart.width - maxLabelWidth, 0, me.maxWidth);
    tickWidth = options.offset ? me.maxWidth / numTicks : maxWidth / (numTicks - 1);
    if (maxLabelWidth + 6 > tickWidth) {
      tickWidth = maxWidth / (numTicks - (options.offset ? 0.5 : 1));
      maxHeight = me.maxHeight - getTickMarkLength(options.grid)
				- tickOpts.padding - getTitleHeight(options.title, me.chart.options.font);
      maxLabelDiagonal = Math.sqrt(maxLabelWidth * maxLabelWidth + maxLabelHeight * maxLabelHeight);
      labelRotation = toDegrees(Math.min(
        Math.asin(_limitValue((labelSizes.highest.height + 6) / tickWidth, -1, 1)),
        Math.asin(_limitValue(maxHeight / maxLabelDiagonal, -1, 1)) - Math.asin(_limitValue(maxLabelHeight / maxLabelDiagonal, -1, 1))
      ));
      labelRotation = Math.max(minRotation, Math.min(maxRotation, labelRotation));
    }
    me.labelRotation = labelRotation;
  }
  afterCalculateLabelRotation() {
    callback(this.options.afterCalculateLabelRotation, [this]);
  }
  beforeFit() {
    callback(this.options.beforeFit, [this]);
  }
  fit() {
    const me = this;
    const minSize = {
      width: 0,
      height: 0
    };
    const {chart, options: {ticks: tickOpts, title: titleOpts, grid: gridOpts}} = me;
    const display = me._isVisible();
    const isHorizontal = me.isHorizontal();
    if (display) {
      const titleHeight = getTitleHeight(titleOpts, chart.options.font);
      if (isHorizontal) {
        minSize.width = me.maxWidth;
        minSize.height = getTickMarkLength(gridOpts) + titleHeight;
      } else {
        minSize.height = me.maxHeight;
        minSize.width = getTickMarkLength(gridOpts) + titleHeight;
      }
      if (tickOpts.display && me.ticks.length) {
        const {first, last, widest, highest} = me._getLabelSizes();
        const tickPadding = tickOpts.padding * 2;
        const angleRadians = toRadians(me.labelRotation);
        const cos = Math.cos(angleRadians);
        const sin = Math.sin(angleRadians);
        if (isHorizontal) {
          const labelHeight = tickOpts.mirror ? 0 : sin * widest.width + cos * highest.height;
          minSize.height = Math.min(me.maxHeight, minSize.height + labelHeight + tickPadding);
        } else {
          const labelWidth = tickOpts.mirror ? 0 : cos * widest.width + sin * highest.height;
          minSize.width = Math.min(me.maxWidth, minSize.width + labelWidth + tickPadding);
        }
        me._calculatePadding(first, last, sin, cos);
      }
    }
    me._handleMargins();
    if (isHorizontal) {
      me.width = me._length = chart.width - me._margins.left - me._margins.right;
      me.height = minSize.height;
    } else {
      me.width = minSize.width;
      me.height = me._length = chart.height - me._margins.top - me._margins.bottom;
    }
  }
  _calculatePadding(first, last, sin, cos) {
    const me = this;
    const {ticks: {align, padding}, position} = me.options;
    const isRotated = me.labelRotation !== 0;
    const labelsBelowTicks = position !== 'top' && me.axis === 'x';
    if (me.isHorizontal()) {
      const offsetLeft = me.getPixelForTick(0) - me.left;
      const offsetRight = me.right - me.getPixelForTick(me.ticks.length - 1);
      let paddingLeft = 0;
      let paddingRight = 0;
      if (isRotated) {
        if (labelsBelowTicks) {
          paddingLeft = cos * first.width;
          paddingRight = sin * last.height;
        } else {
          paddingLeft = sin * first.height;
          paddingRight = cos * last.width;
        }
      } else if (align === 'start') {
        paddingRight = last.width;
      } else if (align === 'end') {
        paddingLeft = first.width;
      } else {
        paddingLeft = first.width / 2;
        paddingRight = last.width / 2;
      }
      me.paddingLeft = Math.max((paddingLeft - offsetLeft + padding) * me.width / (me.width - offsetLeft), 0);
      me.paddingRight = Math.max((paddingRight - offsetRight + padding) * me.width / (me.width - offsetRight), 0);
    } else {
      let paddingTop = last.height / 2;
      let paddingBottom = first.height / 2;
      if (align === 'start') {
        paddingTop = 0;
        paddingBottom = first.height;
      } else if (align === 'end') {
        paddingTop = last.height;
        paddingBottom = 0;
      }
      me.paddingTop = paddingTop + padding;
      me.paddingBottom = paddingBottom + padding;
    }
  }
  _handleMargins() {
    const me = this;
    if (me._margins) {
      me._margins.left = Math.max(me.paddingLeft, me._margins.left);
      me._margins.top = Math.max(me.paddingTop, me._margins.top);
      me._margins.right = Math.max(me.paddingRight, me._margins.right);
      me._margins.bottom = Math.max(me.paddingBottom, me._margins.bottom);
    }
  }
  afterFit() {
    callback(this.options.afterFit, [this]);
  }
  isHorizontal() {
    const {axis, position} = this.options;
    return position === 'top' || position === 'bottom' || axis === 'x';
  }
  isFullSize() {
    return this.options.fullSize;
  }
  _convertTicksToLabels(ticks) {
    const me = this;
    me.beforeTickToLabelConversion();
    me.generateTickLabels(ticks);
    let i, ilen;
    for (i = 0, ilen = ticks.length; i < ilen; i++) {
      if (isNullOrUndef(ticks[i].label)) {
        ticks.splice(i, 1);
        ilen--;
        i--;
      }
    }
    me.afterTickToLabelConversion();
  }
  _getLabelSizes() {
    const me = this;
    let labelSizes = me._labelSizes;
    if (!labelSizes) {
      const sampleSize = me.options.ticks.sampleSize;
      let ticks = me.ticks;
      if (sampleSize < ticks.length) {
        ticks = sample(ticks, sampleSize);
      }
      me._labelSizes = labelSizes = me._computeLabelSizes(ticks, ticks.length);
    }
    return labelSizes;
  }
  _computeLabelSizes(ticks, length) {
    const {ctx, _longestTextCache: caches} = this;
    const widths = [];
    const heights = [];
    let widestLabelSize = 0;
    let highestLabelSize = 0;
    let i, j, jlen, label, tickFont, fontString, cache, lineHeight, width, height, nestedLabel;
    for (i = 0; i < length; ++i) {
      label = ticks[i].label;
      tickFont = this._resolveTickFontOptions(i);
      ctx.font = fontString = tickFont.string;
      cache = caches[fontString] = caches[fontString] || {data: {}, gc: []};
      lineHeight = tickFont.lineHeight;
      width = height = 0;
      if (!isNullOrUndef(label) && !isArray(label)) {
        width = _measureText(ctx, cache.data, cache.gc, width, label);
        height = lineHeight;
      } else if (isArray(label)) {
        for (j = 0, jlen = label.length; j < jlen; ++j) {
          nestedLabel = label[j];
          if (!isNullOrUndef(nestedLabel) && !isArray(nestedLabel)) {
            width = _measureText(ctx, cache.data, cache.gc, width, nestedLabel);
            height += lineHeight;
          }
        }
      }
      widths.push(width);
      heights.push(height);
      widestLabelSize = Math.max(width, widestLabelSize);
      highestLabelSize = Math.max(height, highestLabelSize);
    }
    garbageCollect(caches, length);
    const widest = widths.indexOf(widestLabelSize);
    const highest = heights.indexOf(highestLabelSize);
    const valueAt = (idx) => ({width: widths[idx] || 0, height: heights[idx] || 0});
    return {
      first: valueAt(0),
      last: valueAt(length - 1),
      widest: valueAt(widest),
      highest: valueAt(highest),
      widths,
      heights,
    };
  }
  getLabelForValue(value) {
    return value;
  }
  getPixelForValue(value, index) {
    return NaN;
  }
  getValueForPixel(pixel) {}
  getPixelForTick(index) {
    const ticks = this.ticks;
    if (index < 0 || index > ticks.length - 1) {
      return null;
    }
    return this.getPixelForValue(ticks[index].value);
  }
  getPixelForDecimal(decimal) {
    const me = this;
    if (me._reversePixels) {
      decimal = 1 - decimal;
    }
    const pixel = me._startPixel + decimal * me._length;
    return _int16Range(me._alignToPixels ? _alignPixel(me.chart, pixel, 0) : pixel);
  }
  getDecimalForPixel(pixel) {
    const decimal = (pixel - this._startPixel) / this._length;
    return this._reversePixels ? 1 - decimal : decimal;
  }
  getBasePixel() {
    return this.getPixelForValue(this.getBaseValue());
  }
  getBaseValue() {
    const {min, max} = this;
    return min < 0 && max < 0 ? max :
      min > 0 && max > 0 ? min :
      0;
  }
  getContext(index) {
    const me = this;
    const ticks = me.ticks || [];
    if (index >= 0 && index < ticks.length) {
      const tick = ticks[index];
      return tick.$context ||
				(tick.$context = createTickContext(me.getContext(), index, tick));
    }
    return me.$context ||
			(me.$context = createScaleContext(me.chart.getContext(), me));
  }
  _tickSize() {
    const me = this;
    const optionTicks = me.options.ticks;
    const rot = toRadians(me.labelRotation);
    const cos = Math.abs(Math.cos(rot));
    const sin = Math.abs(Math.sin(rot));
    const labelSizes = me._getLabelSizes();
    const padding = optionTicks.autoSkipPadding || 0;
    const w = labelSizes ? labelSizes.widest.width + padding : 0;
    const h = labelSizes ? labelSizes.highest.height + padding : 0;
    return me.isHorizontal()
      ? h * cos > w * sin ? w / cos : h / sin
      : h * sin < w * cos ? h / cos : w / sin;
  }
  _isVisible() {
    const display = this.options.display;
    if (display !== 'auto') {
      return !!display;
    }
    return this.getMatchingVisibleMetas().length > 0;
  }
  _computeGridLineItems(chartArea) {
    const me = this;
    const axis = me.axis;
    const chart = me.chart;
    const options = me.options;
    const {grid, position} = options;
    const offset = grid.offset;
    const isHorizontal = me.isHorizontal();
    const ticks = me.ticks;
    const ticksLength = ticks.length + (offset ? 1 : 0);
    const tl = getTickMarkLength(grid);
    const items = [];
    const borderOpts = grid.setContext(me.getContext());
    const axisWidth = borderOpts.drawBorder ? borderOpts.borderWidth : 0;
    const axisHalfWidth = axisWidth / 2;
    const alignBorderValue = function(pixel) {
      return _alignPixel(chart, pixel, axisWidth);
    };
    let borderValue, i, lineValue, alignedLineValue;
    let tx1, ty1, tx2, ty2, x1, y1, x2, y2;
    if (position === 'top') {
      borderValue = alignBorderValue(me.bottom);
      ty1 = me.bottom - tl;
      ty2 = borderValue - axisHalfWidth;
      y1 = alignBorderValue(chartArea.top) + axisHalfWidth;
      y2 = chartArea.bottom;
    } else if (position === 'bottom') {
      borderValue = alignBorderValue(me.top);
      y1 = chartArea.top;
      y2 = alignBorderValue(chartArea.bottom) - axisHalfWidth;
      ty1 = borderValue + axisHalfWidth;
      ty2 = me.top + tl;
    } else if (position === 'left') {
      borderValue = alignBorderValue(me.right);
      tx1 = me.right - tl;
      tx2 = borderValue - axisHalfWidth;
      x1 = alignBorderValue(chartArea.left) + axisHalfWidth;
      x2 = chartArea.right;
    } else if (position === 'right') {
      borderValue = alignBorderValue(me.left);
      x1 = chartArea.left;
      x2 = alignBorderValue(chartArea.right) - axisHalfWidth;
      tx1 = borderValue + axisHalfWidth;
      tx2 = me.left + tl;
    } else if (axis === 'x') {
      if (position === 'center') {
        borderValue = alignBorderValue((chartArea.top + chartArea.bottom) / 2 + 0.5);
      } else if (isObject(position)) {
        const positionAxisID = Object.keys(position)[0];
        const value = position[positionAxisID];
        borderValue = alignBorderValue(me.chart.scales[positionAxisID].getPixelForValue(value));
      }
      y1 = chartArea.top;
      y2 = chartArea.bottom;
      ty1 = borderValue + axisHalfWidth;
      ty2 = ty1 + tl;
    } else if (axis === 'y') {
      if (position === 'center') {
        borderValue = alignBorderValue((chartArea.left + chartArea.right) / 2);
      } else if (isObject(position)) {
        const positionAxisID = Object.keys(position)[0];
        const value = position[positionAxisID];
        borderValue = alignBorderValue(me.chart.scales[positionAxisID].getPixelForValue(value));
      }
      tx1 = borderValue - axisHalfWidth;
      tx2 = tx1 - tl;
      x1 = chartArea.left;
      x2 = chartArea.right;
    }
    const limit = valueOrDefault(options.ticks.maxTicksLimit, ticksLength);
    const step = Math.max(1, Math.ceil(ticksLength / limit));
    for (i = 0; i < ticksLength; i += step) {
      const optsAtIndex = grid.setContext(me.getContext(i));
      const lineWidth = optsAtIndex.lineWidth;
      const lineColor = optsAtIndex.color;
      const borderDash = grid.borderDash || [];
      const borderDashOffset = optsAtIndex.borderDashOffset;
      const tickWidth = optsAtIndex.tickWidth;
      const tickColor = optsAtIndex.tickColor;
      const tickBorderDash = optsAtIndex.tickBorderDash || [];
      const tickBorderDashOffset = optsAtIndex.tickBorderDashOffset;
      lineValue = getPixelForGridLine(me, i, offset);
      if (lineValue === undefined) {
        continue;
      }
      alignedLineValue = _alignPixel(chart, lineValue, lineWidth);
      if (isHorizontal) {
        tx1 = tx2 = x1 = x2 = alignedLineValue;
      } else {
        ty1 = ty2 = y1 = y2 = alignedLineValue;
      }
      items.push({
        tx1,
        ty1,
        tx2,
        ty2,
        x1,
        y1,
        x2,
        y2,
        width: lineWidth,
        color: lineColor,
        borderDash,
        borderDashOffset,
        tickWidth,
        tickColor,
        tickBorderDash,
        tickBorderDashOffset,
      });
    }
    me._ticksLength = ticksLength;
    me._borderValue = borderValue;
    return items;
  }
  _computeLabelItems(chartArea) {
    const me = this;
    const axis = me.axis;
    const options = me.options;
    const {position, ticks: optionTicks} = options;
    const isHorizontal = me.isHorizontal();
    const ticks = me.ticks;
    const {align, crossAlign, padding, mirror} = optionTicks;
    const tl = getTickMarkLength(options.grid);
    const tickAndPadding = tl + padding;
    const hTickAndPadding = mirror ? -padding : tickAndPadding;
    const rotation = -toRadians(me.labelRotation);
    const items = [];
    let i, ilen, tick, label, x, y, textAlign, pixel, font, lineHeight, lineCount, textOffset;
    let textBaseline = 'middle';
    if (position === 'top') {
      y = me.bottom - hTickAndPadding;
      textAlign = me._getXAxisLabelAlignment();
    } else if (position === 'bottom') {
      y = me.top + hTickAndPadding;
      textAlign = me._getXAxisLabelAlignment();
    } else if (position === 'left') {
      const ret = me._getYAxisLabelAlignment(tl);
      textAlign = ret.textAlign;
      x = ret.x;
    } else if (position === 'right') {
      const ret = me._getYAxisLabelAlignment(tl);
      textAlign = ret.textAlign;
      x = ret.x;
    } else if (axis === 'x') {
      if (position === 'center') {
        y = ((chartArea.top + chartArea.bottom) / 2) + tickAndPadding;
      } else if (isObject(position)) {
        const positionAxisID = Object.keys(position)[0];
        const value = position[positionAxisID];
        y = me.chart.scales[positionAxisID].getPixelForValue(value) + tickAndPadding;
      }
      textAlign = me._getXAxisLabelAlignment();
    } else if (axis === 'y') {
      if (position === 'center') {
        x = ((chartArea.left + chartArea.right) / 2) - tickAndPadding;
      } else if (isObject(position)) {
        const positionAxisID = Object.keys(position)[0];
        const value = position[positionAxisID];
        x = me.chart.scales[positionAxisID].getPixelForValue(value);
      }
      textAlign = me._getYAxisLabelAlignment(tl).textAlign;
    }
    if (axis === 'y') {
      if (align === 'start') {
        textBaseline = 'top';
      } else if (align === 'end') {
        textBaseline = 'bottom';
      }
    }
    const labelSizes = me._getLabelSizes();
    for (i = 0, ilen = ticks.length; i < ilen; ++i) {
      tick = ticks[i];
      label = tick.label;
      const optsAtIndex = optionTicks.setContext(me.getContext(i));
      pixel = me.getPixelForTick(i) + optionTicks.labelOffset;
      font = me._resolveTickFontOptions(i);
      lineHeight = font.lineHeight;
      lineCount = isArray(label) ? label.length : 1;
      const halfCount = lineCount / 2;
      const color = optsAtIndex.color;
      const strokeColor = optsAtIndex.textStrokeColor;
      const strokeWidth = optsAtIndex.textStrokeWidth;
      if (isHorizontal) {
        x = pixel;
        if (position === 'top') {
          if (crossAlign === 'near' || rotation !== 0) {
            textOffset = -lineCount * lineHeight + lineHeight / 2;
          } else if (crossAlign === 'center') {
            textOffset = -labelSizes.highest.height / 2 - halfCount * lineHeight + lineHeight;
          } else {
            textOffset = -labelSizes.highest.height + lineHeight / 2;
          }
        } else {
          if (crossAlign === 'near' || rotation !== 0) {
            textOffset = lineHeight / 2;
          } else if (crossAlign === 'center') {
            textOffset = labelSizes.highest.height / 2 - halfCount * lineHeight;
          } else {
            textOffset = labelSizes.highest.height - lineCount * lineHeight;
          }
        }
        if (mirror) {
          textOffset *= -1;
        }
      } else {
        y = pixel;
        textOffset = (1 - lineCount) * lineHeight / 2;
      }
      let backdrop;
      if (optsAtIndex.showLabelBackdrop) {
        const labelPadding = toPadding(optsAtIndex.backdropPadding);
        const height = labelSizes.heights[i];
        const width = labelSizes.widths[i];
        let top = y + textOffset - labelPadding.top;
        let left = x - labelPadding.left;
        switch (textBaseline) {
        case 'middle':
          top -= height / 2;
          break;
        case 'bottom':
          top -= height;
          break;
        }
        switch (textAlign) {
        case 'center':
          left -= width / 2;
          break;
        case 'right':
          left -= width;
          break;
        }
        backdrop = {
          left,
          top,
          width: width + labelPadding.width,
          height: height + labelPadding.height,
          color: optsAtIndex.backdropColor,
        };
      }
      items.push({
        rotation,
        label,
        font,
        color,
        strokeColor,
        strokeWidth,
        textOffset,
        textAlign,
        textBaseline,
        translation: [x, y],
        backdrop,
      });
    }
    return items;
  }
  _getXAxisLabelAlignment() {
    const me = this;
    const {position, ticks} = me.options;
    const rotation = -toRadians(me.labelRotation);
    if (rotation) {
      return position === 'top' ? 'left' : 'right';
    }
    let align = 'center';
    if (ticks.align === 'start') {
      align = 'left';
    } else if (ticks.align === 'end') {
      align = 'right';
    }
    return align;
  }
  _getYAxisLabelAlignment(tl) {
    const me = this;
    const {position, ticks: {crossAlign, mirror, padding}} = me.options;
    const labelSizes = me._getLabelSizes();
    const tickAndPadding = tl + padding;
    const widest = labelSizes.widest.width;
    let textAlign;
    let x;
    if (position === 'left') {
      if (mirror) {
        x = me.right + padding;
        if (crossAlign === 'near') {
          textAlign = 'left';
        } else if (crossAlign === 'center') {
          textAlign = 'center';
          x += (widest / 2);
        } else {
          textAlign = 'right';
          x += widest;
        }
      } else {
        x = me.right - tickAndPadding;
        if (crossAlign === 'near') {
          textAlign = 'right';
        } else if (crossAlign === 'center') {
          textAlign = 'center';
          x -= (widest / 2);
        } else {
          textAlign = 'left';
          x = me.left;
        }
      }
    } else if (position === 'right') {
      if (mirror) {
        x = me.left + padding;
        if (crossAlign === 'near') {
          textAlign = 'right';
        } else if (crossAlign === 'center') {
          textAlign = 'center';
          x -= (widest / 2);
        } else {
          textAlign = 'left';
          x -= widest;
        }
      } else {
        x = me.left + tickAndPadding;
        if (crossAlign === 'near') {
          textAlign = 'left';
        } else if (crossAlign === 'center') {
          textAlign = 'center';
          x += widest / 2;
        } else {
          textAlign = 'right';
          x = me.right;
        }
      }
    } else {
      textAlign = 'right';
    }
    return {textAlign, x};
  }
  _computeLabelArea() {
    const me = this;
    if (me.options.ticks.mirror) {
      return;
    }
    const chart = me.chart;
    const position = me.options.position;
    if (position === 'left' || position === 'right') {
      return {top: 0, left: me.left, bottom: chart.height, right: me.right};
    } if (position === 'top' || position === 'bottom') {
      return {top: me.top, left: 0, bottom: me.bottom, right: chart.width};
    }
  }
  drawBackground() {
    const {ctx, options: {backgroundColor}, left, top, width, height} = this;
    if (backgroundColor) {
      ctx.save();
      ctx.fillStyle = backgroundColor;
      ctx.fillRect(left, top, width, height);
      ctx.restore();
    }
  }
  getLineWidthForValue(value) {
    const me = this;
    const grid = me.options.grid;
    if (!me._isVisible() || !grid.display) {
      return 0;
    }
    const ticks = me.ticks;
    const index = ticks.findIndex(t => t.value === value);
    if (index >= 0) {
      const opts = grid.setContext(me.getContext(index));
      return opts.lineWidth;
    }
    return 0;
  }
  drawGrid(chartArea) {
    const me = this;
    const grid = me.options.grid;
    const ctx = me.ctx;
    const items = me._gridLineItems || (me._gridLineItems = me._computeGridLineItems(chartArea));
    let i, ilen;
    const drawLine = (p1, p2, style) => {
      if (!style.width || !style.color) {
        return;
      }
      ctx.save();
      ctx.lineWidth = style.width;
      ctx.strokeStyle = style.color;
      ctx.setLineDash(style.borderDash || []);
      ctx.lineDashOffset = style.borderDashOffset;
      ctx.beginPath();
      ctx.moveTo(p1.x, p1.y);
      ctx.lineTo(p2.x, p2.y);
      ctx.stroke();
      ctx.restore();
    };
    if (grid.display) {
      for (i = 0, ilen = items.length; i < ilen; ++i) {
        const item = items[i];
        if (grid.drawOnChartArea) {
          drawLine(
            {x: item.x1, y: item.y1},
            {x: item.x2, y: item.y2},
            item
          );
        }
        if (grid.drawTicks) {
          drawLine(
            {x: item.tx1, y: item.ty1},
            {x: item.tx2, y: item.ty2},
            {
              color: item.tickColor,
              width: item.tickWidth,
              borderDash: item.tickBorderDash,
              borderDashOffset: item.tickBorderDashOffset
            }
          );
        }
      }
    }
  }
  drawBorder() {
    const me = this;
    const {chart, ctx, options: {grid}} = me;
    const borderOpts = grid.setContext(me.getContext());
    const axisWidth = grid.drawBorder ? borderOpts.borderWidth : 0;
    if (!axisWidth) {
      return;
    }
    const lastLineWidth = grid.setContext(me.getContext(0)).lineWidth;
    const borderValue = me._borderValue;
    let x1, x2, y1, y2;
    if (me.isHorizontal()) {
      x1 = _alignPixel(chart, me.left, axisWidth) - axisWidth / 2;
      x2 = _alignPixel(chart, me.right, lastLineWidth) + lastLineWidth / 2;
      y1 = y2 = borderValue;
    } else {
      y1 = _alignPixel(chart, me.top, axisWidth) - axisWidth / 2;
      y2 = _alignPixel(chart, me.bottom, lastLineWidth) + lastLineWidth / 2;
      x1 = x2 = borderValue;
    }
    ctx.save();
    ctx.lineWidth = borderOpts.borderWidth;
    ctx.strokeStyle = borderOpts.borderColor;
    ctx.beginPath();
    ctx.moveTo(x1, y1);
    ctx.lineTo(x2, y2);
    ctx.stroke();
    ctx.restore();
  }
  drawLabels(chartArea) {
    const me = this;
    const optionTicks = me.options.ticks;
    if (!optionTicks.display) {
      return;
    }
    const ctx = me.ctx;
    const area = me._computeLabelArea();
    if (area) {
      clipArea(ctx, area);
    }
    const items = me._labelItems || (me._labelItems = me._computeLabelItems(chartArea));
    let i, ilen;
    for (i = 0, ilen = items.length; i < ilen; ++i) {
      const item = items[i];
      const tickFont = item.font;
      const label = item.label;
      if (item.backdrop) {
        ctx.fillStyle = item.backdrop.color;
        ctx.fillRect(item.backdrop.left, item.backdrop.top, item.backdrop.width, item.backdrop.height);
      }
      let y = item.textOffset;
      renderText(ctx, label, 0, y, tickFont, item);
    }
    if (area) {
      unclipArea(ctx);
    }
  }
  drawTitle() {
    const {ctx, options: {position, title, reverse}} = this;
    if (!title.display) {
      return;
    }
    const font = toFont(title.font);
    const padding = toPadding(title.padding);
    const align = title.align;
    let offset = font.lineHeight / 2;
    if (position === 'bottom' || position === 'center' || isObject(position)) {
      offset += padding.bottom;
      if (isArray(title.text)) {
        offset += font.lineHeight * (title.text.length - 1);
      }
    } else {
      offset += padding.top;
    }
    const {titleX, titleY, maxWidth, rotation} = titleArgs(this, offset, position, align);
    renderText(ctx, title.text, 0, 0, font, {
      color: title.color,
      maxWidth,
      rotation,
      textAlign: titleAlign(align, position, reverse),
      textBaseline: 'middle',
      translation: [titleX, titleY],
    });
  }
  draw(chartArea) {
    const me = this;
    if (!me._isVisible()) {
      return;
    }
    me.drawBackground();
    me.drawGrid(chartArea);
    me.drawBorder();
    me.drawTitle();
    me.drawLabels(chartArea);
  }
  _layers() {
    const me = this;
    const opts = me.options;
    const tz = opts.ticks && opts.ticks.z || 0;
    const gz = valueOrDefault(opts.grid && opts.grid.z, -1);
    if (!me._isVisible() || me.draw !== Scale.prototype.draw) {
      return [{
        z: tz,
        draw(chartArea) {
          me.draw(chartArea);
        }
      }];
    }
    return [{
      z: gz,
      draw(chartArea) {
        me.drawBackground();
        me.drawGrid(chartArea);
        me.drawTitle();
      }
    }, {
      z: gz + 1,
      draw() {
        me.drawBorder();
      }
    }, {
      z: tz,
      draw(chartArea) {
        me.drawLabels(chartArea);
      }
    }];
  }
  getMatchingVisibleMetas(type) {
    const me = this;
    const metas = me.chart.getSortedVisibleDatasetMetas();
    const axisID = me.axis + 'AxisID';
    const result = [];
    let i, ilen;
    for (i = 0, ilen = metas.length; i < ilen; ++i) {
      const meta = metas[i];
      if (meta[axisID] === me.id && (!type || meta.type === type)) {
        result.push(meta);
      }
    }
    return result;
  }
  _resolveTickFontOptions(index) {
    const opts = this.options.ticks.setContext(this.getContext(index));
    return toFont(opts.font);
  }
  _maxDigits() {
    const me = this;
    const fontSize = me._resolveTickFontOptions(0).lineHeight;
    return (me.isHorizontal() ? me.width : me.height) / fontSize;
  }
}

class TypedRegistry {
  constructor(type, scope, override) {
    this.type = type;
    this.scope = scope;
    this.override = override;
    this.items = Object.create(null);
  }
  isForType(type) {
    return Object.prototype.isPrototypeOf.call(this.type.prototype, type.prototype);
  }
  register(item) {
    const me = this;
    const proto = Object.getPrototypeOf(item);
    let parentScope;
    if (isIChartComponent(proto)) {
      parentScope = me.register(proto);
    }
    const items = me.items;
    const id = item.id;
    const scope = me.scope + '.' + id;
    if (!id) {
      throw new Error('class does not have id: ' + item);
    }
    if (id in items) {
      return scope;
    }
    items[id] = item;
    registerDefaults(item, scope, parentScope);
    if (me.override) {
      defaults.override(item.id, item.overrides);
    }
    return scope;
  }
  get(id) {
    return this.items[id];
  }
  unregister(item) {
    const items = this.items;
    const id = item.id;
    const scope = this.scope;
    if (id in items) {
      delete items[id];
    }
    if (scope && id in defaults[scope]) {
      delete defaults[scope][id];
      if (this.override) {
        delete overrides[id];
      }
    }
  }
}
function registerDefaults(item, scope, parentScope) {
  const itemDefaults = merge(Object.create(null), [
    parentScope ? defaults.get(parentScope) : {},
    defaults.get(scope),
    item.defaults
  ]);
  defaults.set(scope, itemDefaults);
  if (item.defaultRoutes) {
    routeDefaults(scope, item.defaultRoutes);
  }
  if (item.descriptors) {
    defaults.describe(scope, item.descriptors);
  }
}
function routeDefaults(scope, routes) {
  Object.keys(routes).forEach(property => {
    const propertyParts = property.split('.');
    const sourceName = propertyParts.pop();
    const sourceScope = [scope].concat(propertyParts).join('.');
    const parts = routes[property].split('.');
    const targetName = parts.pop();
    const targetScope = parts.join('.');
    defaults.route(sourceScope, sourceName, targetScope, targetName);
  });
}
function isIChartComponent(proto) {
  return 'id' in proto && 'defaults' in proto;
}

class Registry {
  constructor() {
    this.controllers = new TypedRegistry(DatasetController, 'datasets', true);
    this.elements = new TypedRegistry(Element, 'elements');
    this.plugins = new TypedRegistry(Object, 'plugins');
    this.scales = new TypedRegistry(Scale, 'scales');
    this._typedRegistries = [this.controllers, this.scales, this.elements];
  }
  add(...args) {
    this._each('register', args);
  }
  remove(...args) {
    this._each('unregister', args);
  }
  addControllers(...args) {
    this._each('register', args, this.controllers);
  }
  addElements(...args) {
    this._each('register', args, this.elements);
  }
  addPlugins(...args) {
    this._each('register', args, this.plugins);
  }
  addScales(...args) {
    this._each('register', args, this.scales);
  }
  getController(id) {
    return this._get(id, this.controllers, 'controller');
  }
  getElement(id) {
    return this._get(id, this.elements, 'element');
  }
  getPlugin(id) {
    return this._get(id, this.plugins, 'plugin');
  }
  getScale(id) {
    return this._get(id, this.scales, 'scale');
  }
  removeControllers(...args) {
    this._each('unregister', args, this.controllers);
  }
  removeElements(...args) {
    this._each('unregister', args, this.elements);
  }
  removePlugins(...args) {
    this._each('unregister', args, this.plugins);
  }
  removeScales(...args) {
    this._each('unregister', args, this.scales);
  }
  _each(method, args, typedRegistry) {
    const me = this;
    [...args].forEach(arg => {
      const reg = typedRegistry || me._getRegistryForType(arg);
      if (typedRegistry || reg.isForType(arg) || (reg === me.plugins && arg.id)) {
        me._exec(method, reg, arg);
      } else {
        each(arg, item => {
          const itemReg = typedRegistry || me._getRegistryForType(item);
          me._exec(method, itemReg, item);
        });
      }
    });
  }
  _exec(method, registry, component) {
    const camelMethod = _capitalize(method);
    callback(component['before' + camelMethod], [], component);
    registry[method](component);
    callback(component['after' + camelMethod], [], component);
  }
  _getRegistryForType(type) {
    for (let i = 0; i < this._typedRegistries.length; i++) {
      const reg = this._typedRegistries[i];
      if (reg.isForType(type)) {
        return reg;
      }
    }
    return this.plugins;
  }
  _get(id, typedRegistry, type) {
    const item = typedRegistry.get(id);
    if (item === undefined) {
      throw new Error('"' + id + '" is not a registered ' + type + '.');
    }
    return item;
  }
}
var registry = new Registry();

class PluginService {
  constructor() {
    this._init = [];
  }
  notify(chart, hook, args, filter) {
    const me = this;
    if (hook === 'beforeInit') {
      me._init = me._createDescriptors(chart, true);
      me._notify(me._init, chart, 'install');
    }
    const descriptors = filter ? me._descriptors(chart).filter(filter) : me._descriptors(chart);
    const result = me._notify(descriptors, chart, hook, args);
    if (hook === 'destroy') {
      me._notify(descriptors, chart, 'stop');
      me._notify(me._init, chart, 'uninstall');
    }
    return result;
  }
  _notify(descriptors, chart, hook, args) {
    args = args || {};
    for (const descriptor of descriptors) {
      const plugin = descriptor.plugin;
      const method = plugin[hook];
      const params = [chart, args, descriptor.options];
      if (callback(method, params, plugin) === false && args.cancelable) {
        return false;
      }
    }
    return true;
  }
  invalidate() {
    if (!isNullOrUndef(this._cache)) {
      this._oldCache = this._cache;
      this._cache = undefined;
    }
  }
  _descriptors(chart) {
    if (this._cache) {
      return this._cache;
    }
    const descriptors = this._cache = this._createDescriptors(chart);
    this._notifyStateChanges(chart);
    return descriptors;
  }
  _createDescriptors(chart, all) {
    const config = chart && chart.config;
    const options = valueOrDefault(config.options && config.options.plugins, {});
    const plugins = allPlugins(config);
    return options === false && !all ? [] : createDescriptors(chart, plugins, options, all);
  }
  _notifyStateChanges(chart) {
    const previousDescriptors = this._oldCache || [];
    const descriptors = this._cache;
    const diff = (a, b) => a.filter(x => !b.some(y => x.plugin.id === y.plugin.id));
    this._notify(diff(previousDescriptors, descriptors), chart, 'stop');
    this._notify(diff(descriptors, previousDescriptors), chart, 'start');
  }
}
function allPlugins(config) {
  const plugins = [];
  const keys = Object.keys(registry.plugins.items);
  for (let i = 0; i < keys.length; i++) {
    plugins.push(registry.getPlugin(keys[i]));
  }
  const local = config.plugins || [];
  for (let i = 0; i < local.length; i++) {
    const plugin = local[i];
    if (plugins.indexOf(plugin) === -1) {
      plugins.push(plugin);
    }
  }
  return plugins;
}
function getOpts(options, all) {
  if (!all && options === false) {
    return null;
  }
  if (options === true) {
    return {};
  }
  return options;
}
function createDescriptors(chart, plugins, options, all) {
  const result = [];
  const context = chart.getContext();
  for (let i = 0; i < plugins.length; i++) {
    const plugin = plugins[i];
    const id = plugin.id;
    const opts = getOpts(options[id], all);
    if (opts === null) {
      continue;
    }
    result.push({
      plugin,
      options: pluginOpts(chart.config, plugin, opts, context)
    });
  }
  return result;
}
function pluginOpts(config, plugin, opts, context) {
  const keys = config.pluginScopeKeys(plugin);
  const scopes = config.getOptionScopes(opts, keys);
  return config.createResolver(scopes, context, [''], {scriptable: false, indexable: false, allKeys: true});
}

function getIndexAxis(type, options) {
  const datasetDefaults = defaults.datasets[type] || {};
  const datasetOptions = (options.datasets || {})[type] || {};
  return datasetOptions.indexAxis || options.indexAxis || datasetDefaults.indexAxis || 'x';
}
function getAxisFromDefaultScaleID(id, indexAxis) {
  let axis = id;
  if (id === '_index_') {
    axis = indexAxis;
  } else if (id === '_value_') {
    axis = indexAxis === 'x' ? 'y' : 'x';
  }
  return axis;
}
function getDefaultScaleIDFromAxis(axis, indexAxis) {
  return axis === indexAxis ? '_index_' : '_value_';
}
function axisFromPosition(position) {
  if (position === 'top' || position === 'bottom') {
    return 'x';
  }
  if (position === 'left' || position === 'right') {
    return 'y';
  }
}
function determineAxis(id, scaleOptions) {
  if (id === 'x' || id === 'y') {
    return id;
  }
  return scaleOptions.axis || axisFromPosition(scaleOptions.position) || id.charAt(0).toLowerCase();
}
function mergeScaleConfig(config, options) {
  const chartDefaults = overrides[config.type] || {scales: {}};
  const configScales = options.scales || {};
  const chartIndexAxis = getIndexAxis(config.type, options);
  const firstIDs = Object.create(null);
  const scales = Object.create(null);
  Object.keys(configScales).forEach(id => {
    const scaleConf = configScales[id];
    const axis = determineAxis(id, scaleConf);
    const defaultId = getDefaultScaleIDFromAxis(axis, chartIndexAxis);
    const defaultScaleOptions = chartDefaults.scales || {};
    firstIDs[axis] = firstIDs[axis] || id;
    scales[id] = mergeIf(Object.create(null), [{axis}, scaleConf, defaultScaleOptions[axis], defaultScaleOptions[defaultId]]);
  });
  config.data.datasets.forEach(dataset => {
    const type = dataset.type || config.type;
    const indexAxis = dataset.indexAxis || getIndexAxis(type, options);
    const datasetDefaults = overrides[type] || {};
    const defaultScaleOptions = datasetDefaults.scales || {};
    Object.keys(defaultScaleOptions).forEach(defaultID => {
      const axis = getAxisFromDefaultScaleID(defaultID, indexAxis);
      const id = dataset[axis + 'AxisID'] || firstIDs[axis] || axis;
      scales[id] = scales[id] || Object.create(null);
      mergeIf(scales[id], [{axis}, configScales[id], defaultScaleOptions[defaultID]]);
    });
  });
  Object.keys(scales).forEach(key => {
    const scale = scales[key];
    mergeIf(scale, [defaults.scales[scale.type], defaults.scale]);
  });
  return scales;
}
function initOptions(config) {
  const options = config.options || (config.options = {});
  options.plugins = valueOrDefault(options.plugins, {});
  options.scales = mergeScaleConfig(config, options);
}
function initData(data) {
  data = data || {};
  data.datasets = data.datasets || [];
  data.labels = data.labels || [];
  return data;
}
function initConfig(config) {
  config = config || {};
  config.data = initData(config.data);
  initOptions(config);
  return config;
}
const keyCache = new Map();
const keysCached = new Set();
function cachedKeys(cacheKey, generate) {
  let keys = keyCache.get(cacheKey);
  if (!keys) {
    keys = generate();
    keyCache.set(cacheKey, keys);
    keysCached.add(keys);
  }
  return keys;
}
const addIfFound = (set, obj, key) => {
  const opts = resolveObjectKey(obj, key);
  if (opts !== undefined) {
    set.add(opts);
  }
};
class Config {
  constructor(config) {
    this._config = initConfig(config);
    this._scopeCache = new Map();
    this._resolverCache = new Map();
  }
  get platform() {
    return this._config.platform;
  }
  get type() {
    return this._config.type;
  }
  set type(type) {
    this._config.type = type;
  }
  get data() {
    return this._config.data;
  }
  set data(data) {
    this._config.data = initData(data);
  }
  get options() {
    return this._config.options;
  }
  set options(options) {
    this._config.options = options;
  }
  get plugins() {
    return this._config.plugins;
  }
  update() {
    const config = this._config;
    this.clearCache();
    initOptions(config);
  }
  clearCache() {
    this._scopeCache.clear();
    this._resolverCache.clear();
  }
  datasetScopeKeys(datasetType) {
    return cachedKeys(datasetType,
      () => [[
        `datasets.${datasetType}`,
        ''
      ]]);
  }
  datasetAnimationScopeKeys(datasetType, transition) {
    return cachedKeys(`${datasetType}.transition.${transition}`,
      () => [
        [
          `datasets.${datasetType}.transitions.${transition}`,
          `transitions.${transition}`,
        ],
        [
          `datasets.${datasetType}`,
          ''
        ]
      ]);
  }
  datasetElementScopeKeys(datasetType, elementType) {
    return cachedKeys(`${datasetType}-${elementType}`,
      () => [[
        `datasets.${datasetType}.elements.${elementType}`,
        `datasets.${datasetType}`,
        `elements.${elementType}`,
        ''
      ]]);
  }
  pluginScopeKeys(plugin) {
    const id = plugin.id;
    const type = this.type;
    return cachedKeys(`${type}-plugin-${id}`,
      () => [[
        `plugins.${id}`,
        ...plugin.additionalOptionScopes || [],
      ]]);
  }
  _cachedScopes(mainScope, resetCache) {
    const _scopeCache = this._scopeCache;
    let cache = _scopeCache.get(mainScope);
    if (!cache || resetCache) {
      cache = new Map();
      _scopeCache.set(mainScope, cache);
    }
    return cache;
  }
  getOptionScopes(mainScope, keyLists, resetCache) {
    const {options, type} = this;
    const cache = this._cachedScopes(mainScope, resetCache);
    const cached = cache.get(keyLists);
    if (cached) {
      return cached;
    }
    const scopes = new Set();
    keyLists.forEach(keys => {
      if (mainScope) {
        scopes.add(mainScope);
        keys.forEach(key => addIfFound(scopes, mainScope, key));
      }
      keys.forEach(key => addIfFound(scopes, options, key));
      keys.forEach(key => addIfFound(scopes, overrides[type] || {}, key));
      keys.forEach(key => addIfFound(scopes, defaults, key));
      keys.forEach(key => addIfFound(scopes, descriptors, key));
    });
    const array = Array.from(scopes);
    if (array.length === 0) {
      array.push(Object.create(null));
    }
    if (keysCached.has(keyLists)) {
      cache.set(keyLists, array);
    }
    return array;
  }
  chartOptionScopes() {
    const {options, type} = this;
    return [
      options,
      overrides[type] || {},
      defaults.datasets[type] || {},
      {type},
      defaults,
      descriptors
    ];
  }
  resolveNamedOptions(scopes, names, context, prefixes = ['']) {
    const result = {$shared: true};
    const {resolver, subPrefixes} = getResolver(this._resolverCache, scopes, prefixes);
    let options = resolver;
    if (needContext(resolver, names)) {
      result.$shared = false;
      context = isFunction(context) ? context() : context;
      const subResolver = this.createResolver(scopes, context, subPrefixes);
      options = _attachContext(resolver, context, subResolver);
    }
    for (const prop of names) {
      result[prop] = options[prop];
    }
    return result;
  }
  createResolver(scopes, context, prefixes = [''], descriptorDefaults) {
    const {resolver} = getResolver(this._resolverCache, scopes, prefixes);
    return isObject(context)
      ? _attachContext(resolver, context, undefined, descriptorDefaults)
      : resolver;
  }
}
function getResolver(resolverCache, scopes, prefixes) {
  let cache = resolverCache.get(scopes);
  if (!cache) {
    cache = new Map();
    resolverCache.set(scopes, cache);
  }
  const cacheKey = prefixes.join();
  let cached = cache.get(cacheKey);
  if (!cached) {
    const resolver = _createResolver(scopes, prefixes);
    cached = {
      resolver,
      subPrefixes: prefixes.filter(p => !p.toLowerCase().includes('hover'))
    };
    cache.set(cacheKey, cached);
  }
  return cached;
}
function needContext(proxy, names) {
  const {isScriptable, isIndexable} = _descriptors(proxy);
  for (const prop of names) {
    if ((isScriptable(prop) && isFunction(proxy[prop]))
      || (isIndexable(prop) && isArray(proxy[prop]))) {
      return true;
    }
  }
  return false;
}

var version = "3.5.1";

const KNOWN_POSITIONS = ['top', 'bottom', 'left', 'right', 'chartArea'];
function positionIsHorizontal(position, axis) {
  return position === 'top' || position === 'bottom' || (KNOWN_POSITIONS.indexOf(position) === -1 && axis === 'x');
}
function compare2Level(l1, l2) {
  return function(a, b) {
    return a[l1] === b[l1]
      ? a[l2] - b[l2]
      : a[l1] - b[l1];
  };
}
function onAnimationsComplete(context) {
  const chart = context.chart;
  const animationOptions = chart.options.animation;
  chart.notifyPlugins('afterRender');
  callback(animationOptions && animationOptions.onComplete, [context], chart);
}
function onAnimationProgress(context) {
  const chart = context.chart;
  const animationOptions = chart.options.animation;
  callback(animationOptions && animationOptions.onProgress, [context], chart);
}
function getCanvas(item) {
  if (_isDomSupported() && typeof item === 'string') {
    item = document.getElementById(item);
  } else if (item && item.length) {
    item = item[0];
  }
  if (item && item.canvas) {
    item = item.canvas;
  }
  return item;
}
const instances = {};
const getChart = (key) => {
  const canvas = getCanvas(key);
  return Object.values(instances).filter((c) => c.canvas === canvas).pop();
};
class Chart {
  constructor(item, userConfig) {
    const me = this;
    const config = this.config = new Config(userConfig);
    const initialCanvas = getCanvas(item);
    const existingChart = getChart(initialCanvas);
    if (existingChart) {
      throw new Error(
        'Canvas is already in use. Chart with ID \'' + existingChart.id + '\'' +
				' must be destroyed before the canvas can be reused.'
      );
    }
    const options = config.createResolver(config.chartOptionScopes(), me.getContext());
    this.platform = new (config.platform || _detectPlatform(initialCanvas))();
    const context = me.platform.acquireContext(initialCanvas, options.aspectRatio);
    const canvas = context && context.canvas;
    const height = canvas && canvas.height;
    const width = canvas && canvas.width;
    this.id = uid();
    this.ctx = context;
    this.canvas = canvas;
    this.width = width;
    this.height = height;
    this._options = options;
    this._aspectRatio = this.aspectRatio;
    this._layers = [];
    this._metasets = [];
    this._stacks = undefined;
    this.boxes = [];
    this.currentDevicePixelRatio = undefined;
    this.chartArea = undefined;
    this._active = [];
    this._lastEvent = undefined;
    this._listeners = {};
    this._responsiveListeners = undefined;
    this._sortedMetasets = [];
    this.scales = {};
    this._plugins = new PluginService();
    this.$proxies = {};
    this._hiddenIndices = {};
    this.attached = false;
    this._animationsDisabled = undefined;
    this.$context = undefined;
    this._doResize = debounce(() => this.update('resize'), options.resizeDelay || 0);
    instances[me.id] = me;
    if (!context || !canvas) {
      console.error("Failed to create chart: can't acquire context from the given item");
      return;
    }
    animator.listen(me, 'complete', onAnimationsComplete);
    animator.listen(me, 'progress', onAnimationProgress);
    me._initialize();
    if (me.attached) {
      me.update();
    }
  }
  get aspectRatio() {
    const {options: {aspectRatio, maintainAspectRatio}, width, height, _aspectRatio} = this;
    if (!isNullOrUndef(aspectRatio)) {
      return aspectRatio;
    }
    if (maintainAspectRatio && _aspectRatio) {
      return _aspectRatio;
    }
    return height ? width / height : null;
  }
  get data() {
    return this.config.data;
  }
  set data(data) {
    this.config.data = data;
  }
  get options() {
    return this._options;
  }
  set options(options) {
    this.config.options = options;
  }
  _initialize() {
    const me = this;
    me.notifyPlugins('beforeInit');
    if (me.options.responsive) {
      me.resize();
    } else {
      retinaScale(me, me.options.devicePixelRatio);
    }
    me.bindEvents();
    me.notifyPlugins('afterInit');
    return me;
  }
  clear() {
    clearCanvas(this.canvas, this.ctx);
    return this;
  }
  stop() {
    animator.stop(this);
    return this;
  }
  resize(width, height) {
    if (!animator.running(this)) {
      this._resize(width, height);
    } else {
      this._resizeBeforeDraw = {width, height};
    }
  }
  _resize(width, height) {
    const me = this;
    const options = me.options;
    const canvas = me.canvas;
    const aspectRatio = options.maintainAspectRatio && me.aspectRatio;
    const newSize = me.platform.getMaximumSize(canvas, width, height, aspectRatio);
    const newRatio = options.devicePixelRatio || me.platform.getDevicePixelRatio();
    me.width = newSize.width;
    me.height = newSize.height;
    me._aspectRatio = me.aspectRatio;
    if (!retinaScale(me, newRatio, true)) {
      return;
    }
    me.notifyPlugins('resize', {size: newSize});
    callback(options.onResize, [me, newSize], me);
    if (me.attached) {
      if (me._doResize()) {
        me.render();
      }
    }
  }
  ensureScalesHaveIDs() {
    const options = this.options;
    const scalesOptions = options.scales || {};
    each(scalesOptions, (axisOptions, axisID) => {
      axisOptions.id = axisID;
    });
  }
  buildOrUpdateScales() {
    const me = this;
    const options = me.options;
    const scaleOpts = options.scales;
    const scales = me.scales;
    const updated = Object.keys(scales).reduce((obj, id) => {
      obj[id] = false;
      return obj;
    }, {});
    let items = [];
    if (scaleOpts) {
      items = items.concat(
        Object.keys(scaleOpts).map((id) => {
          const scaleOptions = scaleOpts[id];
          const axis = determineAxis(id, scaleOptions);
          const isRadial = axis === 'r';
          const isHorizontal = axis === 'x';
          return {
            options: scaleOptions,
            dposition: isRadial ? 'chartArea' : isHorizontal ? 'bottom' : 'left',
            dtype: isRadial ? 'radialLinear' : isHorizontal ? 'category' : 'linear'
          };
        })
      );
    }
    each(items, (item) => {
      const scaleOptions = item.options;
      const id = scaleOptions.id;
      const axis = determineAxis(id, scaleOptions);
      const scaleType = valueOrDefault(scaleOptions.type, item.dtype);
      if (scaleOptions.position === undefined || positionIsHorizontal(scaleOptions.position, axis) !== positionIsHorizontal(item.dposition)) {
        scaleOptions.position = item.dposition;
      }
      updated[id] = true;
      let scale = null;
      if (id in scales && scales[id].type === scaleType) {
        scale = scales[id];
      } else {
        const scaleClass = registry.getScale(scaleType);
        scale = new scaleClass({
          id,
          type: scaleType,
          ctx: me.ctx,
          chart: me
        });
        scales[scale.id] = scale;
      }
      scale.init(scaleOptions, options);
    });
    each(updated, (hasUpdated, id) => {
      if (!hasUpdated) {
        delete scales[id];
      }
    });
    each(scales, (scale) => {
      layouts.configure(me, scale, scale.options);
      layouts.addBox(me, scale);
    });
  }
  _updateMetasets() {
    const me = this;
    const metasets = me._metasets;
    const numData = me.data.datasets.length;
    const numMeta = metasets.length;
    metasets.sort((a, b) => a.index - b.index);
    if (numMeta > numData) {
      for (let i = numData; i < numMeta; ++i) {
        me._destroyDatasetMeta(i);
      }
      metasets.splice(numData, numMeta - numData);
    }
    me._sortedMetasets = metasets.slice(0).sort(compare2Level('order', 'index'));
  }
  _removeUnreferencedMetasets() {
    const me = this;
    const {_metasets: metasets, data: {datasets}} = me;
    if (metasets.length > datasets.length) {
      delete me._stacks;
    }
    metasets.forEach((meta, index) => {
      if (datasets.filter(x => x === meta._dataset).length === 0) {
        me._destroyDatasetMeta(index);
      }
    });
  }
  buildOrUpdateControllers() {
    const me = this;
    const newControllers = [];
    const datasets = me.data.datasets;
    let i, ilen;
    me._removeUnreferencedMetasets();
    for (i = 0, ilen = datasets.length; i < ilen; i++) {
      const dataset = datasets[i];
      let meta = me.getDatasetMeta(i);
      const type = dataset.type || me.config.type;
      if (meta.type && meta.type !== type) {
        me._destroyDatasetMeta(i);
        meta = me.getDatasetMeta(i);
      }
      meta.type = type;
      meta.indexAxis = dataset.indexAxis || getIndexAxis(type, me.options);
      meta.order = dataset.order || 0;
      meta.index = i;
      meta.label = '' + dataset.label;
      meta.visible = me.isDatasetVisible(i);
      if (meta.controller) {
        meta.controller.updateIndex(i);
        meta.controller.linkScales();
      } else {
        const ControllerClass = registry.getController(type);
        const {datasetElementType, dataElementType} = defaults.datasets[type];
        Object.assign(ControllerClass.prototype, {
          dataElementType: registry.getElement(dataElementType),
          datasetElementType: datasetElementType && registry.getElement(datasetElementType)
        });
        meta.controller = new ControllerClass(me, i);
        newControllers.push(meta.controller);
      }
    }
    me._updateMetasets();
    return newControllers;
  }
  _resetElements() {
    const me = this;
    each(me.data.datasets, (dataset, datasetIndex) => {
      me.getDatasetMeta(datasetIndex).controller.reset();
    }, me);
  }
  reset() {
    this._resetElements();
    this.notifyPlugins('reset');
  }
  update(mode) {
    const me = this;
    const config = me.config;
    config.update();
    me._options = config.createResolver(config.chartOptionScopes(), me.getContext());
    each(me.scales, (scale) => {
      layouts.removeBox(me, scale);
    });
    const animsDisabled = me._animationsDisabled = !me.options.animation;
    me.ensureScalesHaveIDs();
    me.buildOrUpdateScales();
    const existingEvents = new Set(Object.keys(me._listeners));
    const newEvents = new Set(me.options.events);
    if (!setsEqual(existingEvents, newEvents) || !!this._responsiveListeners !== me.options.responsive) {
      me.unbindEvents();
      me.bindEvents();
    }
    me._plugins.invalidate();
    if (me.notifyPlugins('beforeUpdate', {mode, cancelable: true}) === false) {
      return;
    }
    const newControllers = me.buildOrUpdateControllers();
    me.notifyPlugins('beforeElementsUpdate');
    let minPadding = 0;
    for (let i = 0, ilen = me.data.datasets.length; i < ilen; i++) {
      const {controller} = me.getDatasetMeta(i);
      const reset = !animsDisabled && newControllers.indexOf(controller) === -1;
      controller.buildOrUpdateElements(reset);
      minPadding = Math.max(+controller.getMaxOverflow(), minPadding);
    }
    me._minPadding = minPadding;
    me._updateLayout(minPadding);
    if (!animsDisabled) {
      each(newControllers, (controller) => {
        controller.reset();
      });
    }
    me._updateDatasets(mode);
    me.notifyPlugins('afterUpdate', {mode});
    me._layers.sort(compare2Level('z', '_idx'));
    if (me._lastEvent) {
      me._eventHandler(me._lastEvent, true);
    }
    me.render();
  }
  _updateLayout(minPadding) {
    const me = this;
    if (me.notifyPlugins('beforeLayout', {cancelable: true}) === false) {
      return;
    }
    layouts.update(me, me.width, me.height, minPadding);
    const area = me.chartArea;
    const noArea = area.width <= 0 || area.height <= 0;
    me._layers = [];
    each(me.boxes, (box) => {
      if (noArea && box.position === 'chartArea') {
        return;
      }
      if (box.configure) {
        box.configure();
      }
      me._layers.push(...box._layers());
    }, me);
    me._layers.forEach((item, index) => {
      item._idx = index;
    });
    me.notifyPlugins('afterLayout');
  }
  _updateDatasets(mode) {
    const me = this;
    const isFunction = typeof mode === 'function';
    if (me.notifyPlugins('beforeDatasetsUpdate', {mode, cancelable: true}) === false) {
      return;
    }
    for (let i = 0, ilen = me.data.datasets.length; i < ilen; ++i) {
      me._updateDataset(i, isFunction ? mode({datasetIndex: i}) : mode);
    }
    me.notifyPlugins('afterDatasetsUpdate', {mode});
  }
  _updateDataset(index, mode) {
    const me = this;
    const meta = me.getDatasetMeta(index);
    const args = {meta, index, mode, cancelable: true};
    if (me.notifyPlugins('beforeDatasetUpdate', args) === false) {
      return;
    }
    meta.controller._update(mode);
    args.cancelable = false;
    me.notifyPlugins('afterDatasetUpdate', args);
  }
  render() {
    const me = this;
    if (me.notifyPlugins('beforeRender', {cancelable: true}) === false) {
      return;
    }
    if (animator.has(me)) {
      if (me.attached && !animator.running(me)) {
        animator.start(me);
      }
    } else {
      me.draw();
      onAnimationsComplete({chart: me});
    }
  }
  draw() {
    const me = this;
    let i;
    if (me._resizeBeforeDraw) {
      const {width, height} = me._resizeBeforeDraw;
      me._resize(width, height);
      me._resizeBeforeDraw = null;
    }
    me.clear();
    if (me.width <= 0 || me.height <= 0) {
      return;
    }
    if (me.notifyPlugins('beforeDraw', {cancelable: true}) === false) {
      return;
    }
    const layers = me._layers;
    for (i = 0; i < layers.length && layers[i].z <= 0; ++i) {
      layers[i].draw(me.chartArea);
    }
    me._drawDatasets();
    for (; i < layers.length; ++i) {
      layers[i].draw(me.chartArea);
    }
    me.notifyPlugins('afterDraw');
  }
  _getSortedDatasetMetas(filterVisible) {
    const me = this;
    const metasets = me._sortedMetasets;
    const result = [];
    let i, ilen;
    for (i = 0, ilen = metasets.length; i < ilen; ++i) {
      const meta = metasets[i];
      if (!filterVisible || meta.visible) {
        result.push(meta);
      }
    }
    return result;
  }
  getSortedVisibleDatasetMetas() {
    return this._getSortedDatasetMetas(true);
  }
  _drawDatasets() {
    const me = this;
    if (me.notifyPlugins('beforeDatasetsDraw', {cancelable: true}) === false) {
      return;
    }
    const metasets = me.getSortedVisibleDatasetMetas();
    for (let i = metasets.length - 1; i >= 0; --i) {
      me._drawDataset(metasets[i]);
    }
    me.notifyPlugins('afterDatasetsDraw');
  }
  _drawDataset(meta) {
    const me = this;
    const ctx = me.ctx;
    const clip = meta._clip;
    const useClip = !clip.disabled;
    const area = me.chartArea;
    const args = {
      meta,
      index: meta.index,
      cancelable: true
    };
    if (me.notifyPlugins('beforeDatasetDraw', args) === false) {
      return;
    }
    if (useClip) {
      clipArea(ctx, {
        left: clip.left === false ? 0 : area.left - clip.left,
        right: clip.right === false ? me.width : area.right + clip.right,
        top: clip.top === false ? 0 : area.top - clip.top,
        bottom: clip.bottom === false ? me.height : area.bottom + clip.bottom
      });
    }
    meta.controller.draw();
    if (useClip) {
      unclipArea(ctx);
    }
    args.cancelable = false;
    me.notifyPlugins('afterDatasetDraw', args);
  }
  getElementsAtEventForMode(e, mode, options, useFinalPosition) {
    const method = Interaction.modes[mode];
    if (typeof method === 'function') {
      return method(this, e, options, useFinalPosition);
    }
    return [];
  }
  getDatasetMeta(datasetIndex) {
    const me = this;
    const dataset = me.data.datasets[datasetIndex];
    const metasets = me._metasets;
    let meta = metasets.filter(x => x && x._dataset === dataset).pop();
    if (!meta) {
      meta = {
        type: null,
        data: [],
        dataset: null,
        controller: null,
        hidden: null,
        xAxisID: null,
        yAxisID: null,
        order: dataset && dataset.order || 0,
        index: datasetIndex,
        _dataset: dataset,
        _parsed: [],
        _sorted: false
      };
      metasets.push(meta);
    }
    return meta;
  }
  getContext() {
    return this.$context || (this.$context = {chart: this, type: 'chart'});
  }
  getVisibleDatasetCount() {
    return this.getSortedVisibleDatasetMetas().length;
  }
  isDatasetVisible(datasetIndex) {
    const dataset = this.data.datasets[datasetIndex];
    if (!dataset) {
      return false;
    }
    const meta = this.getDatasetMeta(datasetIndex);
    return typeof meta.hidden === 'boolean' ? !meta.hidden : !dataset.hidden;
  }
  setDatasetVisibility(datasetIndex, visible) {
    const meta = this.getDatasetMeta(datasetIndex);
    meta.hidden = !visible;
  }
  toggleDataVisibility(index) {
    this._hiddenIndices[index] = !this._hiddenIndices[index];
  }
  getDataVisibility(index) {
    return !this._hiddenIndices[index];
  }
  _updateVisibility(datasetIndex, dataIndex, visible) {
    const me = this;
    const mode = visible ? 'show' : 'hide';
    const meta = me.getDatasetMeta(datasetIndex);
    const anims = meta.controller._resolveAnimations(undefined, mode);
    if (defined(dataIndex)) {
      meta.data[dataIndex].hidden = !visible;
      me.update();
    } else {
      me.setDatasetVisibility(datasetIndex, visible);
      anims.update(meta, {visible});
      me.update((ctx) => ctx.datasetIndex === datasetIndex ? mode : undefined);
    }
  }
  hide(datasetIndex, dataIndex) {
    this._updateVisibility(datasetIndex, dataIndex, false);
  }
  show(datasetIndex, dataIndex) {
    this._updateVisibility(datasetIndex, dataIndex, true);
  }
  _destroyDatasetMeta(datasetIndex) {
    const me = this;
    const meta = me._metasets && me._metasets[datasetIndex];
    if (meta && meta.controller) {
      meta.controller._destroy();
      delete me._metasets[datasetIndex];
    }
  }
  destroy() {
    const me = this;
    const {canvas, ctx} = me;
    let i, ilen;
    me.stop();
    animator.remove(me);
    for (i = 0, ilen = me.data.datasets.length; i < ilen; ++i) {
      me._destroyDatasetMeta(i);
    }
    me.config.clearCache();
    if (canvas) {
      me.unbindEvents();
      clearCanvas(canvas, ctx);
      me.platform.releaseContext(ctx);
      me.canvas = null;
      me.ctx = null;
    }
    me.notifyPlugins('destroy');
    delete instances[me.id];
  }
  toBase64Image(...args) {
    return this.canvas.toDataURL(...args);
  }
  bindEvents() {
    this.bindUserEvents();
    if (this.options.responsive) {
      this.bindResponsiveEvents();
    } else {
      this.attached = true;
    }
  }
  bindUserEvents() {
    const me = this;
    const listeners = me._listeners;
    const platform = me.platform;
    const _add = (type, listener) => {
      platform.addEventListener(me, type, listener);
      listeners[type] = listener;
    };
    const listener = function(e, x, y) {
      e.offsetX = x;
      e.offsetY = y;
      me._eventHandler(e);
    };
    each(me.options.events, (type) => _add(type, listener));
  }
  bindResponsiveEvents() {
    const me = this;
    if (!me._responsiveListeners) {
      me._responsiveListeners = {};
    }
    const listeners = me._responsiveListeners;
    const platform = me.platform;
    const _add = (type, listener) => {
      platform.addEventListener(me, type, listener);
      listeners[type] = listener;
    };
    const _remove = (type, listener) => {
      if (listeners[type]) {
        platform.removeEventListener(me, type, listener);
        delete listeners[type];
      }
    };
    const listener = (width, height) => {
      if (me.canvas) {
        me.resize(width, height);
      }
    };
    let detached;
    const attached = () => {
      _remove('attach', attached);
      me.attached = true;
      me.resize();
      _add('resize', listener);
      _add('detach', detached);
    };
    detached = () => {
      me.attached = false;
      _remove('resize', listener);
      _add('attach', attached);
    };
    if (platform.isAttached(me.canvas)) {
      attached();
    } else {
      detached();
    }
  }
  unbindEvents() {
    const me = this;
    each(me._listeners, (listener, type) => {
      me.platform.removeEventListener(me, type, listener);
    });
    me._listeners = {};
    each(me._responsiveListeners, (listener, type) => {
      me.platform.removeEventListener(me, type, listener);
    });
    me._responsiveListeners = undefined;
  }
  updateHoverStyle(items, mode, enabled) {
    const prefix = enabled ? 'set' : 'remove';
    let meta, item, i, ilen;
    if (mode === 'dataset') {
      meta = this.getDatasetMeta(items[0].datasetIndex);
      meta.controller['_' + prefix + 'DatasetHoverStyle']();
    }
    for (i = 0, ilen = items.length; i < ilen; ++i) {
      item = items[i];
      const controller = item && this.getDatasetMeta(item.datasetIndex).controller;
      if (controller) {
        controller[prefix + 'HoverStyle'](item.element, item.datasetIndex, item.index);
      }
    }
  }
  getActiveElements() {
    return this._active || [];
  }
  setActiveElements(activeElements) {
    const me = this;
    const lastActive = me._active || [];
    const active = activeElements.map(({datasetIndex, index}) => {
      const meta = me.getDatasetMeta(datasetIndex);
      if (!meta) {
        throw new Error('No dataset found at index ' + datasetIndex);
      }
      return {
        datasetIndex,
        element: meta.data[index],
        index,
      };
    });
    const changed = !_elementsEqual(active, lastActive);
    if (changed) {
      me._active = active;
      me._updateHoverStyles(active, lastActive);
    }
  }
  notifyPlugins(hook, args, filter) {
    return this._plugins.notify(this, hook, args, filter);
  }
  _updateHoverStyles(active, lastActive, replay) {
    const me = this;
    const hoverOptions = me.options.hover;
    const diff = (a, b) => a.filter(x => !b.some(y => x.datasetIndex === y.datasetIndex && x.index === y.index));
    const deactivated = diff(lastActive, active);
    const activated = replay ? active : diff(active, lastActive);
    if (deactivated.length) {
      me.updateHoverStyle(deactivated, hoverOptions.mode, false);
    }
    if (activated.length && hoverOptions.mode) {
      me.updateHoverStyle(activated, hoverOptions.mode, true);
    }
  }
  _eventHandler(e, replay) {
    const me = this;
    const args = {event: e, replay, cancelable: true};
    const eventFilter = (plugin) => (plugin.options.events || this.options.events).includes(e.type);
    if (me.notifyPlugins('beforeEvent', args, eventFilter) === false) {
      return;
    }
    const changed = me._handleEvent(e, replay);
    args.cancelable = false;
    me.notifyPlugins('afterEvent', args, eventFilter);
    if (changed || args.changed) {
      me.render();
    }
    return me;
  }
  _handleEvent(e, replay) {
    const me = this;
    const {_active: lastActive = [], options} = me;
    const hoverOptions = options.hover;
    const useFinalPosition = replay;
    let active = [];
    let changed = false;
    let lastEvent = null;
    if (e.type !== 'mouseout') {
      active = me.getElementsAtEventForMode(e, hoverOptions.mode, hoverOptions, useFinalPosition);
      lastEvent = e.type === 'click' ? me._lastEvent : e;
    }
    me._lastEvent = null;
    if (_isPointInArea(e, me.chartArea, me._minPadding)) {
      callback(options.onHover, [e, active, me], me);
      if (e.type === 'mouseup' || e.type === 'click' || e.type === 'contextmenu') {
        callback(options.onClick, [e, active, me], me);
      }
    }
    changed = !_elementsEqual(active, lastActive);
    if (changed || replay) {
      me._active = active;
      me._updateHoverStyles(active, lastActive, replay);
    }
    me._lastEvent = lastEvent;
    return changed;
  }
}
const invalidatePlugins = () => each(Chart.instances, (chart) => chart._plugins.invalidate());
const enumerable = true;
Object.defineProperties(Chart, {
  defaults: {
    enumerable,
    value: defaults
  },
  instances: {
    enumerable,
    value: instances
  },
  overrides: {
    enumerable,
    value: overrides
  },
  registry: {
    enumerable,
    value: registry
  },
  version: {
    enumerable,
    value: version
  },
  getChart: {
    enumerable,
    value: getChart
  },
  register: {
    enumerable,
    value: (...items) => {
      registry.add(...items);
      invalidatePlugins();
    }
  },
  unregister: {
    enumerable,
    value: (...items) => {
      registry.remove(...items);
      invalidatePlugins();
    }
  }
});

function clipArc(ctx, element, endAngle) {
  const {startAngle, pixelMargin, x, y, outerRadius, innerRadius} = element;
  let angleMargin = pixelMargin / outerRadius;
  ctx.beginPath();
  ctx.arc(x, y, outerRadius, startAngle - angleMargin, endAngle + angleMargin);
  if (innerRadius > pixelMargin) {
    angleMargin = pixelMargin / innerRadius;
    ctx.arc(x, y, innerRadius, endAngle + angleMargin, startAngle - angleMargin, true);
  } else {
    ctx.arc(x, y, pixelMargin, endAngle + HALF_PI, startAngle - HALF_PI);
  }
  ctx.closePath();
  ctx.clip();
}
function toRadiusCorners(value) {
  return _readValueToProps(value, ['outerStart', 'outerEnd', 'innerStart', 'innerEnd']);
}
function parseBorderRadius$1(arc, innerRadius, outerRadius, angleDelta) {
  const o = toRadiusCorners(arc.options.borderRadius);
  const halfThickness = (outerRadius - innerRadius) / 2;
  const innerLimit = Math.min(halfThickness, angleDelta * innerRadius / 2);
  const computeOuterLimit = (val) => {
    const outerArcLimit = (outerRadius - Math.min(halfThickness, val)) * angleDelta / 2;
    return _limitValue(val, 0, Math.min(halfThickness, outerArcLimit));
  };
  return {
    outerStart: computeOuterLimit(o.outerStart),
    outerEnd: computeOuterLimit(o.outerEnd),
    innerStart: _limitValue(o.innerStart, 0, innerLimit),
    innerEnd: _limitValue(o.innerEnd, 0, innerLimit),
  };
}
function rThetaToXY(r, theta, x, y) {
  return {
    x: x + r * Math.cos(theta),
    y: y + r * Math.sin(theta),
  };
}
function pathArc(ctx, element, offset, spacing, end) {
  const {x, y, startAngle: start, pixelMargin, innerRadius: innerR} = element;
  const outerRadius = Math.max(element.outerRadius + spacing + offset - pixelMargin, 0);
  const innerRadius = innerR > 0 ? innerR + spacing + offset + pixelMargin : 0;
  let spacingOffset = 0;
  const alpha = end - start;
  if (spacing) {
    const noSpacingInnerRadius = innerR > 0 ? innerR - spacing : 0;
    const noSpacingOuterRadius = outerRadius > 0 ? outerRadius - spacing : 0;
    const avNogSpacingRadius = (noSpacingInnerRadius + noSpacingOuterRadius) / 2;
    const adjustedAngle = avNogSpacingRadius !== 0 ? (alpha * avNogSpacingRadius) / (avNogSpacingRadius + spacing) : alpha;
    spacingOffset = (alpha - adjustedAngle) / 2;
  }
  const beta = Math.max(0.001, alpha * outerRadius - offset / PI) / outerRadius;
  const angleOffset = (alpha - beta) / 2;
  const startAngle = start + angleOffset + spacingOffset;
  const endAngle = end - angleOffset - spacingOffset;
  const {outerStart, outerEnd, innerStart, innerEnd} = parseBorderRadius$1(element, innerRadius, outerRadius, endAngle - startAngle);
  const outerStartAdjustedRadius = outerRadius - outerStart;
  const outerEndAdjustedRadius = outerRadius - outerEnd;
  const outerStartAdjustedAngle = startAngle + outerStart / outerStartAdjustedRadius;
  const outerEndAdjustedAngle = endAngle - outerEnd / outerEndAdjustedRadius;
  const innerStartAdjustedRadius = innerRadius + innerStart;
  const innerEndAdjustedRadius = innerRadius + innerEnd;
  const innerStartAdjustedAngle = startAngle + innerStart / innerStartAdjustedRadius;
  const innerEndAdjustedAngle = endAngle - innerEnd / innerEndAdjustedRadius;
  ctx.beginPath();
  ctx.arc(x, y, outerRadius, outerStartAdjustedAngle, outerEndAdjustedAngle);
  if (outerEnd > 0) {
    const pCenter = rThetaToXY(outerEndAdjustedRadius, outerEndAdjustedAngle, x, y);
    ctx.arc(pCenter.x, pCenter.y, outerEnd, outerEndAdjustedAngle, endAngle + HALF_PI);
  }
  const p4 = rThetaToXY(innerEndAdjustedRadius, endAngle, x, y);
  ctx.lineTo(p4.x, p4.y);
  if (innerEnd > 0) {
    const pCenter = rThetaToXY(innerEndAdjustedRadius, innerEndAdjustedAngle, x, y);
    ctx.arc(pCenter.x, pCenter.y, innerEnd, endAngle + HALF_PI, innerEndAdjustedAngle + Math.PI);
  }
  ctx.arc(x, y, innerRadius, endAngle - (innerEnd / innerRadius), startAngle + (innerStart / innerRadius), true);
  if (innerStart > 0) {
    const pCenter = rThetaToXY(innerStartAdjustedRadius, innerStartAdjustedAngle, x, y);
    ctx.arc(pCenter.x, pCenter.y, innerStart, innerStartAdjustedAngle + Math.PI, startAngle - HALF_PI);
  }
  const p8 = rThetaToXY(outerStartAdjustedRadius, startAngle, x, y);
  ctx.lineTo(p8.x, p8.y);
  if (outerStart > 0) {
    const pCenter = rThetaToXY(outerStartAdjustedRadius, outerStartAdjustedAngle, x, y);
    ctx.arc(pCenter.x, pCenter.y, outerStart, startAngle - HALF_PI, outerStartAdjustedAngle);
  }
  ctx.closePath();
}
function drawArc(ctx, element, offset, spacing) {
  const {fullCircles, startAngle, circumference} = element;
  let endAngle = element.endAngle;
  if (fullCircles) {
    pathArc(ctx, element, offset, spacing, startAngle + TAU);
    for (let i = 0; i < fullCircles; ++i) {
      ctx.fill();
    }
    if (!isNaN(circumference)) {
      endAngle = startAngle + circumference % TAU;
      if (circumference % TAU === 0) {
        endAngle += TAU;
      }
    }
  }
  pathArc(ctx, element, offset, spacing, endAngle);
  ctx.fill();
  return endAngle;
}
function drawFullCircleBorders(ctx, element, inner) {
  const {x, y, startAngle, pixelMargin, fullCircles} = element;
  const outerRadius = Math.max(element.outerRadius - pixelMargin, 0);
  const innerRadius = element.innerRadius + pixelMargin;
  let i;
  if (inner) {
    clipArc(ctx, element, startAngle + TAU);
  }
  ctx.beginPath();
  ctx.arc(x, y, innerRadius, startAngle + TAU, startAngle, true);
  for (i = 0; i < fullCircles; ++i) {
    ctx.stroke();
  }
  ctx.beginPath();
  ctx.arc(x, y, outerRadius, startAngle, startAngle + TAU);
  for (i = 0; i < fullCircles; ++i) {
    ctx.stroke();
  }
}
function drawBorder(ctx, element, offset, spacing, endAngle) {
  const {options} = element;
  const inner = options.borderAlign === 'inner';
  if (!options.borderWidth) {
    return;
  }
  if (inner) {
    ctx.lineWidth = options.borderWidth * 2;
    ctx.lineJoin = 'round';
  } else {
    ctx.lineWidth = options.borderWidth;
    ctx.lineJoin = 'bevel';
  }
  if (element.fullCircles) {
    drawFullCircleBorders(ctx, element, inner);
  }
  if (inner) {
    clipArc(ctx, element, endAngle);
  }
  pathArc(ctx, element, offset, spacing, endAngle);
  ctx.stroke();
}
class ArcElement extends Element {
  constructor(cfg) {
    super();
    this.options = undefined;
    this.circumference = undefined;
    this.startAngle = undefined;
    this.endAngle = undefined;
    this.innerRadius = undefined;
    this.outerRadius = undefined;
    this.pixelMargin = 0;
    this.fullCircles = 0;
    if (cfg) {
      Object.assign(this, cfg);
    }
  }
  inRange(chartX, chartY, useFinalPosition) {
    const point = this.getProps(['x', 'y'], useFinalPosition);
    const {angle, distance} = getAngleFromPoint(point, {x: chartX, y: chartY});
    const {startAngle, endAngle, innerRadius, outerRadius, circumference} = this.getProps([
      'startAngle',
      'endAngle',
      'innerRadius',
      'outerRadius',
      'circumference'
    ], useFinalPosition);
    const rAdjust = this.options.spacing / 2;
    const betweenAngles = circumference >= TAU || _angleBetween(angle, startAngle, endAngle);
    const withinRadius = (distance >= innerRadius + rAdjust && distance <= outerRadius + rAdjust);
    return (betweenAngles && withinRadius);
  }
  getCenterPoint(useFinalPosition) {
    const {x, y, startAngle, endAngle, innerRadius, outerRadius} = this.getProps([
      'x',
      'y',
      'startAngle',
      'endAngle',
      'innerRadius',
      'outerRadius',
      'circumference',
    ], useFinalPosition);
    const {offset, spacing} = this.options;
    const halfAngle = (startAngle + endAngle) / 2;
    const halfRadius = (innerRadius + outerRadius + spacing + offset) / 2;
    return {
      x: x + Math.cos(halfAngle) * halfRadius,
      y: y + Math.sin(halfAngle) * halfRadius
    };
  }
  tooltipPosition(useFinalPosition) {
    return this.getCenterPoint(useFinalPosition);
  }
  draw(ctx) {
    const me = this;
    const {options, circumference} = me;
    const offset = (options.offset || 0) / 2;
    const spacing = (options.spacing || 0) / 2;
    me.pixelMargin = (options.borderAlign === 'inner') ? 0.33 : 0;
    me.fullCircles = circumference > TAU ? Math.floor(circumference / TAU) : 0;
    if (circumference === 0 || me.innerRadius < 0 || me.outerRadius < 0) {
      return;
    }
    ctx.save();
    let radiusOffset = 0;
    if (offset) {
      radiusOffset = offset / 2;
      const halfAngle = (me.startAngle + me.endAngle) / 2;
      ctx.translate(Math.cos(halfAngle) * radiusOffset, Math.sin(halfAngle) * radiusOffset);
      if (me.circumference >= PI) {
        radiusOffset = offset;
      }
    }
    ctx.fillStyle = options.backgroundColor;
    ctx.strokeStyle = options.borderColor;
    const endAngle = drawArc(ctx, me, radiusOffset, spacing);
    drawBorder(ctx, me, radiusOffset, spacing, endAngle);
    ctx.restore();
  }
}
ArcElement.id = 'arc';
ArcElement.defaults = {
  borderAlign: 'center',
  borderColor: '#fff',
  borderRadius: 0,
  borderWidth: 2,
  offset: 0,
  spacing: 0,
  angle: undefined,
};
ArcElement.defaultRoutes = {
  backgroundColor: 'backgroundColor'
};

function setStyle(ctx, options, style = options) {
  ctx.lineCap = valueOrDefault(style.borderCapStyle, options.borderCapStyle);
  ctx.setLineDash(valueOrDefault(style.borderDash, options.borderDash));
  ctx.lineDashOffset = valueOrDefault(style.borderDashOffset, options.borderDashOffset);
  ctx.lineJoin = valueOrDefault(style.borderJoinStyle, options.borderJoinStyle);
  ctx.lineWidth = valueOrDefault(style.borderWidth, options.borderWidth);
  ctx.strokeStyle = valueOrDefault(style.borderColor, options.borderColor);
}
function lineTo(ctx, previous, target) {
  ctx.lineTo(target.x, target.y);
}
function getLineMethod(options) {
  if (options.stepped) {
    return _steppedLineTo;
  }
  if (options.tension || options.cubicInterpolationMode === 'monotone') {
    return _bezierCurveTo;
  }
  return lineTo;
}
function pathVars(points, segment, params = {}) {
  const count = points.length;
  const {start: paramsStart = 0, end: paramsEnd = count - 1} = params;
  const {start: segmentStart, end: segmentEnd} = segment;
  const start = Math.max(paramsStart, segmentStart);
  const end = Math.min(paramsEnd, segmentEnd);
  const outside = paramsStart < segmentStart && paramsEnd < segmentStart || paramsStart > segmentEnd && paramsEnd > segmentEnd;
  return {
    count,
    start,
    loop: segment.loop,
    ilen: end < start && !outside ? count + end - start : end - start
  };
}
function pathSegment(ctx, line, segment, params) {
  const {points, options} = line;
  const {count, start, loop, ilen} = pathVars(points, segment, params);
  const lineMethod = getLineMethod(options);
  let {move = true, reverse} = params || {};
  let i, point, prev;
  for (i = 0; i <= ilen; ++i) {
    point = points[(start + (reverse ? ilen - i : i)) % count];
    if (point.skip) {
      continue;
    } else if (move) {
      ctx.moveTo(point.x, point.y);
      move = false;
    } else {
      lineMethod(ctx, prev, point, reverse, options.stepped);
    }
    prev = point;
  }
  if (loop) {
    point = points[(start + (reverse ? ilen : 0)) % count];
    lineMethod(ctx, prev, point, reverse, options.stepped);
  }
  return !!loop;
}
function fastPathSegment(ctx, line, segment, params) {
  const points = line.points;
  const {count, start, ilen} = pathVars(points, segment, params);
  const {move = true, reverse} = params || {};
  let avgX = 0;
  let countX = 0;
  let i, point, prevX, minY, maxY, lastY;
  const pointIndex = (index) => (start + (reverse ? ilen - index : index)) % count;
  const drawX = () => {
    if (minY !== maxY) {
      ctx.lineTo(avgX, maxY);
      ctx.lineTo(avgX, minY);
      ctx.lineTo(avgX, lastY);
    }
  };
  if (move) {
    point = points[pointIndex(0)];
    ctx.moveTo(point.x, point.y);
  }
  for (i = 0; i <= ilen; ++i) {
    point = points[pointIndex(i)];
    if (point.skip) {
      continue;
    }
    const x = point.x;
    const y = point.y;
    const truncX = x | 0;
    if (truncX === prevX) {
      if (y < minY) {
        minY = y;
      } else if (y > maxY) {
        maxY = y;
      }
      avgX = (countX * avgX + x) / ++countX;
    } else {
      drawX();
      ctx.lineTo(x, y);
      prevX = truncX;
      countX = 0;
      minY = maxY = y;
    }
    lastY = y;
  }
  drawX();
}
function _getSegmentMethod(line) {
  const opts = line.options;
  const borderDash = opts.borderDash && opts.borderDash.length;
  const useFastPath = !line._decimated && !line._loop && !opts.tension && opts.cubicInterpolationMode !== 'monotone' && !opts.stepped && !borderDash;
  return useFastPath ? fastPathSegment : pathSegment;
}
function _getInterpolationMethod(options) {
  if (options.stepped) {
    return _steppedInterpolation;
  }
  if (options.tension || options.cubicInterpolationMode === 'monotone') {
    return _bezierInterpolation;
  }
  return _pointInLine;
}
function strokePathWithCache(ctx, line, start, count) {
  let path = line._path;
  if (!path) {
    path = line._path = new Path2D();
    if (line.path(path, start, count)) {
      path.closePath();
    }
  }
  setStyle(ctx, line.options);
  ctx.stroke(path);
}
function strokePathDirect(ctx, line, start, count) {
  const {segments, options} = line;
  const segmentMethod = _getSegmentMethod(line);
  for (const segment of segments) {
    setStyle(ctx, options, segment.style);
    ctx.beginPath();
    if (segmentMethod(ctx, line, segment, {start, end: start + count - 1})) {
      ctx.closePath();
    }
    ctx.stroke();
  }
}
const usePath2D = typeof Path2D === 'function';
function draw(ctx, line, start, count) {
  if (usePath2D && line.segments.length === 1) {
    strokePathWithCache(ctx, line, start, count);
  } else {
    strokePathDirect(ctx, line, start, count);
  }
}
class LineElement extends Element {
  constructor(cfg) {
    super();
    this.animated = true;
    this.options = undefined;
    this._loop = undefined;
    this._fullLoop = undefined;
    this._path = undefined;
    this._points = undefined;
    this._segments = undefined;
    this._decimated = false;
    this._pointsUpdated = false;
    this._datasetIndex = undefined;
    if (cfg) {
      Object.assign(this, cfg);
    }
  }
  updateControlPoints(chartArea, indexAxis) {
    const me = this;
    const options = me.options;
    if ((options.tension || options.cubicInterpolationMode === 'monotone') && !options.stepped && !me._pointsUpdated) {
      const loop = options.spanGaps ? me._loop : me._fullLoop;
      _updateBezierControlPoints(me._points, options, chartArea, loop, indexAxis);
      me._pointsUpdated = true;
    }
  }
  set points(points) {
    const me = this;
    me._points = points;
    delete me._segments;
    delete me._path;
    me._pointsUpdated = false;
  }
  get points() {
    return this._points;
  }
  get segments() {
    return this._segments || (this._segments = _computeSegments(this, this.options.segment));
  }
  first() {
    const segments = this.segments;
    const points = this.points;
    return segments.length && points[segments[0].start];
  }
  last() {
    const segments = this.segments;
    const points = this.points;
    const count = segments.length;
    return count && points[segments[count - 1].end];
  }
  interpolate(point, property) {
    const me = this;
    const options = me.options;
    const value = point[property];
    const points = me.points;
    const segments = _boundSegments(me, {property, start: value, end: value});
    if (!segments.length) {
      return;
    }
    const result = [];
    const _interpolate = _getInterpolationMethod(options);
    let i, ilen;
    for (i = 0, ilen = segments.length; i < ilen; ++i) {
      const {start, end} = segments[i];
      const p1 = points[start];
      const p2 = points[end];
      if (p1 === p2) {
        result.push(p1);
        continue;
      }
      const t = Math.abs((value - p1[property]) / (p2[property] - p1[property]));
      const interpolated = _interpolate(p1, p2, t, options.stepped);
      interpolated[property] = point[property];
      result.push(interpolated);
    }
    return result.length === 1 ? result[0] : result;
  }
  pathSegment(ctx, segment, params) {
    const segmentMethod = _getSegmentMethod(this);
    return segmentMethod(ctx, this, segment, params);
  }
  path(ctx, start, count) {
    const me = this;
    const segments = me.segments;
    const segmentMethod = _getSegmentMethod(me);
    let loop = me._loop;
    start = start || 0;
    count = count || (me.points.length - start);
    for (const segment of segments) {
      loop &= segmentMethod(ctx, me, segment, {start, end: start + count - 1});
    }
    return !!loop;
  }
  draw(ctx, chartArea, start, count) {
    const me = this;
    const options = me.options || {};
    const points = me.points || [];
    if (!points.length || !options.borderWidth) {
      return;
    }
    ctx.save();
    draw(ctx, me, start, count);
    ctx.restore();
    if (me.animated) {
      me._pointsUpdated = false;
      me._path = undefined;
    }
  }
}
LineElement.id = 'line';
LineElement.defaults = {
  borderCapStyle: 'butt',
  borderDash: [],
  borderDashOffset: 0,
  borderJoinStyle: 'miter',
  borderWidth: 3,
  capBezierPoints: true,
  cubicInterpolationMode: 'default',
  fill: false,
  spanGaps: false,
  stepped: false,
  tension: 0,
};
LineElement.defaultRoutes = {
  backgroundColor: 'backgroundColor',
  borderColor: 'borderColor'
};
LineElement.descriptors = {
  _scriptable: true,
  _indexable: (name) => name !== 'borderDash' && name !== 'fill',
};

function inRange$1(el, pos, axis, useFinalPosition) {
  const options = el.options;
  const {[axis]: value} = el.getProps([axis], useFinalPosition);
  return (Math.abs(pos - value) < options.radius + options.hitRadius);
}
class PointElement extends Element {
  constructor(cfg) {
    super();
    this.options = undefined;
    this.parsed = undefined;
    this.skip = undefined;
    this.stop = undefined;
    if (cfg) {
      Object.assign(this, cfg);
    }
  }
  inRange(mouseX, mouseY, useFinalPosition) {
    const options = this.options;
    const {x, y} = this.getProps(['x', 'y'], useFinalPosition);
    return ((Math.pow(mouseX - x, 2) + Math.pow(mouseY - y, 2)) < Math.pow(options.hitRadius + options.radius, 2));
  }
  inXRange(mouseX, useFinalPosition) {
    return inRange$1(this, mouseX, 'x', useFinalPosition);
  }
  inYRange(mouseY, useFinalPosition) {
    return inRange$1(this, mouseY, 'y', useFinalPosition);
  }
  getCenterPoint(useFinalPosition) {
    const {x, y} = this.getProps(['x', 'y'], useFinalPosition);
    return {x, y};
  }
  size(options) {
    options = options || this.options || {};
    let radius = options.radius || 0;
    radius = Math.max(radius, radius && options.hoverRadius || 0);
    const borderWidth = radius && options.borderWidth || 0;
    return (radius + borderWidth) * 2;
  }
  draw(ctx, area) {
    const me = this;
    const options = me.options;
    if (me.skip || options.radius < 0.1 || !_isPointInArea(me, area, me.size(options) / 2)) {
      return;
    }
    ctx.strokeStyle = options.borderColor;
    ctx.lineWidth = options.borderWidth;
    ctx.fillStyle = options.backgroundColor;
    drawPoint(ctx, options, me.x, me.y);
  }
  getRange() {
    const options = this.options || {};
    return options.radius + options.hitRadius;
  }
}
PointElement.id = 'point';
PointElement.defaults = {
  borderWidth: 1,
  hitRadius: 1,
  hoverBorderWidth: 1,
  hoverRadius: 4,
  pointStyle: 'circle',
  radius: 3,
  rotation: 0
};
PointElement.defaultRoutes = {
  backgroundColor: 'backgroundColor',
  borderColor: 'borderColor'
};

function getBarBounds(bar, useFinalPosition) {
  const {x, y, base, width, height} = bar.getProps(['x', 'y', 'base', 'width', 'height'], useFinalPosition);
  let left, right, top, bottom, half;
  if (bar.horizontal) {
    half = height / 2;
    left = Math.min(x, base);
    right = Math.max(x, base);
    top = y - half;
    bottom = y + half;
  } else {
    half = width / 2;
    left = x - half;
    right = x + half;
    top = Math.min(y, base);
    bottom = Math.max(y, base);
  }
  return {left, top, right, bottom};
}
function skipOrLimit(skip, value, min, max) {
  return skip ? 0 : _limitValue(value, min, max);
}
function parseBorderWidth(bar, maxW, maxH) {
  const value = bar.options.borderWidth;
  const skip = bar.borderSkipped;
  const o = toTRBL(value);
  return {
    t: skipOrLimit(skip.top, o.top, 0, maxH),
    r: skipOrLimit(skip.right, o.right, 0, maxW),
    b: skipOrLimit(skip.bottom, o.bottom, 0, maxH),
    l: skipOrLimit(skip.left, o.left, 0, maxW)
  };
}
function parseBorderRadius(bar, maxW, maxH) {
  const {enableBorderRadius} = bar.getProps(['enableBorderRadius']);
  const value = bar.options.borderRadius;
  const o = toTRBLCorners(value);
  const maxR = Math.min(maxW, maxH);
  const skip = bar.borderSkipped;
  const enableBorder = enableBorderRadius || isObject(value);
  return {
    topLeft: skipOrLimit(!enableBorder || skip.top || skip.left, o.topLeft, 0, maxR),
    topRight: skipOrLimit(!enableBorder || skip.top || skip.right, o.topRight, 0, maxR),
    bottomLeft: skipOrLimit(!enableBorder || skip.bottom || skip.left, o.bottomLeft, 0, maxR),
    bottomRight: skipOrLimit(!enableBorder || skip.bottom || skip.right, o.bottomRight, 0, maxR)
  };
}
function boundingRects(bar) {
  const bounds = getBarBounds(bar);
  const width = bounds.right - bounds.left;
  const height = bounds.bottom - bounds.top;
  const border = parseBorderWidth(bar, width / 2, height / 2);
  const radius = parseBorderRadius(bar, width / 2, height / 2);
  return {
    outer: {
      x: bounds.left,
      y: bounds.top,
      w: width,
      h: height,
      radius
    },
    inner: {
      x: bounds.left + border.l,
      y: bounds.top + border.t,
      w: width - border.l - border.r,
      h: height - border.t - border.b,
      radius: {
        topLeft: Math.max(0, radius.topLeft - Math.max(border.t, border.l)),
        topRight: Math.max(0, radius.topRight - Math.max(border.t, border.r)),
        bottomLeft: Math.max(0, radius.bottomLeft - Math.max(border.b, border.l)),
        bottomRight: Math.max(0, radius.bottomRight - Math.max(border.b, border.r)),
      }
    }
  };
}
function inRange(bar, x, y, useFinalPosition) {
  const skipX = x === null;
  const skipY = y === null;
  const skipBoth = skipX && skipY;
  const bounds = bar && !skipBoth && getBarBounds(bar, useFinalPosition);
  return bounds
		&& (skipX || x >= bounds.left && x <= bounds.right)
		&& (skipY || y >= bounds.top && y <= bounds.bottom);
}
function hasRadius(radius) {
  return radius.topLeft || radius.topRight || radius.bottomLeft || radius.bottomRight;
}
function addNormalRectPath(ctx, rect) {
  ctx.rect(rect.x, rect.y, rect.w, rect.h);
}
function inflateRect(rect, amount, refRect = {}) {
  const x = rect.x !== refRect.x ? -amount : 0;
  const y = rect.y !== refRect.y ? -amount : 0;
  const w = (rect.x + rect.w !== refRect.x + refRect.w ? amount : 0) - x;
  const h = (rect.y + rect.h !== refRect.y + refRect.h ? amount : 0) - y;
  return {
    x: rect.x + x,
    y: rect.y + y,
    w: rect.w + w,
    h: rect.h + h,
    radius: rect.radius
  };
}
class BarElement extends Element {
  constructor(cfg) {
    super();
    this.options = undefined;
    this.horizontal = undefined;
    this.base = undefined;
    this.width = undefined;
    this.height = undefined;
    if (cfg) {
      Object.assign(this, cfg);
    }
  }
  draw(ctx) {
    const options = this.options;
    const {inner, outer} = boundingRects(this);
    const addRectPath = hasRadius(outer.radius) ? addRoundedRectPath : addNormalRectPath;
    const inflateAmount = 0.33;
    ctx.save();
    if (outer.w !== inner.w || outer.h !== inner.h) {
      ctx.beginPath();
      addRectPath(ctx, inflateRect(outer, inflateAmount, inner));
      ctx.clip();
      addRectPath(ctx, inflateRect(inner, -inflateAmount, outer));
      ctx.fillStyle = options.borderColor;
      ctx.fill('evenodd');
    }
    ctx.beginPath();
    addRectPath(ctx, inflateRect(inner, inflateAmount, outer));
    ctx.fillStyle = options.backgroundColor;
    ctx.fill();
    ctx.restore();
  }
  inRange(mouseX, mouseY, useFinalPosition) {
    return inRange(this, mouseX, mouseY, useFinalPosition);
  }
  inXRange(mouseX, useFinalPosition) {
    return inRange(this, mouseX, null, useFinalPosition);
  }
  inYRange(mouseY, useFinalPosition) {
    return inRange(this, null, mouseY, useFinalPosition);
  }
  getCenterPoint(useFinalPosition) {
    const {x, y, base, horizontal} = this.getProps(['x', 'y', 'base', 'horizontal'], useFinalPosition);
    return {
      x: horizontal ? (x + base) / 2 : x,
      y: horizontal ? y : (y + base) / 2
    };
  }
  getRange(axis) {
    return axis === 'x' ? this.width / 2 : this.height / 2;
  }
}
BarElement.id = 'bar';
BarElement.defaults = {
  borderSkipped: 'start',
  borderWidth: 0,
  borderRadius: 0,
  enableBorderRadius: true,
  pointStyle: undefined
};
BarElement.defaultRoutes = {
  backgroundColor: 'backgroundColor',
  borderColor: 'borderColor'
};

var elements = /*#__PURE__*/Object.freeze({
__proto__: null,
ArcElement: ArcElement,
LineElement: LineElement,
PointElement: PointElement,
BarElement: BarElement
});

function lttbDecimation(data, start, count, availableWidth, options) {
  const samples = options.samples || availableWidth;
  if (samples >= count) {
    return data.slice(start, start + count);
  }
  const decimated = [];
  const bucketWidth = (count - 2) / (samples - 2);
  let sampledIndex = 0;
  const endIndex = start + count - 1;
  let a = start;
  let i, maxAreaPoint, maxArea, area, nextA;
  decimated[sampledIndex++] = data[a];
  for (i = 0; i < samples - 2; i++) {
    let avgX = 0;
    let avgY = 0;
    let j;
    const avgRangeStart = Math.floor((i + 1) * bucketWidth) + 1 + start;
    const avgRangeEnd = Math.min(Math.floor((i + 2) * bucketWidth) + 1, count) + start;
    const avgRangeLength = avgRangeEnd - avgRangeStart;
    for (j = avgRangeStart; j < avgRangeEnd; j++) {
      avgX += data[j].x;
      avgY += data[j].y;
    }
    avgX /= avgRangeLength;
    avgY /= avgRangeLength;
    const rangeOffs = Math.floor(i * bucketWidth) + 1 + start;
    const rangeTo = Math.min(Math.floor((i + 1) * bucketWidth) + 1, count) + start;
    const {x: pointAx, y: pointAy} = data[a];
    maxArea = area = -1;
    for (j = rangeOffs; j < rangeTo; j++) {
      area = 0.5 * Math.abs(
        (pointAx - avgX) * (data[j].y - pointAy) -
        (pointAx - data[j].x) * (avgY - pointAy)
      );
      if (area > maxArea) {
        maxArea = area;
        maxAreaPoint = data[j];
        nextA = j;
      }
    }
    decimated[sampledIndex++] = maxAreaPoint;
    a = nextA;
  }
  decimated[sampledIndex++] = data[endIndex];
  return decimated;
}
function minMaxDecimation(data, start, count, availableWidth) {
  let avgX = 0;
  let countX = 0;
  let i, point, x, y, prevX, minIndex, maxIndex, startIndex, minY, maxY;
  const decimated = [];
  const endIndex = start + count - 1;
  const xMin = data[start].x;
  const xMax = data[endIndex].x;
  const dx = xMax - xMin;
  for (i = start; i < start + count; ++i) {
    point = data[i];
    x = (point.x - xMin) / dx * availableWidth;
    y = point.y;
    const truncX = x | 0;
    if (truncX === prevX) {
      if (y < minY) {
        minY = y;
        minIndex = i;
      } else if (y > maxY) {
        maxY = y;
        maxIndex = i;
      }
      avgX = (countX * avgX + point.x) / ++countX;
    } else {
      const lastIndex = i - 1;
      if (!isNullOrUndef(minIndex) && !isNullOrUndef(maxIndex)) {
        const intermediateIndex1 = Math.min(minIndex, maxIndex);
        const intermediateIndex2 = Math.max(minIndex, maxIndex);
        if (intermediateIndex1 !== startIndex && intermediateIndex1 !== lastIndex) {
          decimated.push({
            ...data[intermediateIndex1],
            x: avgX,
          });
        }
        if (intermediateIndex2 !== startIndex && intermediateIndex2 !== lastIndex) {
          decimated.push({
            ...data[intermediateIndex2],
            x: avgX
          });
        }
      }
      if (i > 0 && lastIndex !== startIndex) {
        decimated.push(data[lastIndex]);
      }
      decimated.push(point);
      prevX = truncX;
      countX = 0;
      minY = maxY = y;
      minIndex = maxIndex = startIndex = i;
    }
  }
  return decimated;
}
function cleanDecimatedDataset(dataset) {
  if (dataset._decimated) {
    const data = dataset._data;
    delete dataset._decimated;
    delete dataset._data;
    Object.defineProperty(dataset, 'data', {value: data});
  }
}
function cleanDecimatedData(chart) {
  chart.data.datasets.forEach((dataset) => {
    cleanDecimatedDataset(dataset);
  });
}
function getStartAndCountOfVisiblePointsSimplified(meta, points) {
  const pointCount = points.length;
  let start = 0;
  let count;
  const {iScale} = meta;
  const {min, max, minDefined, maxDefined} = iScale.getUserBounds();
  if (minDefined) {
    start = _limitValue(_lookupByKey(points, iScale.axis, min).lo, 0, pointCount - 1);
  }
  if (maxDefined) {
    count = _limitValue(_lookupByKey(points, iScale.axis, max).hi + 1, start, pointCount) - start;
  } else {
    count = pointCount - start;
  }
  return {start, count};
}
var plugin_decimation = {
  id: 'decimation',
  defaults: {
    algorithm: 'min-max',
    enabled: false,
  },
  beforeElementsUpdate: (chart, args, options) => {
    if (!options.enabled) {
      cleanDecimatedData(chart);
      return;
    }
    const availableWidth = chart.width;
    chart.data.datasets.forEach((dataset, datasetIndex) => {
      const {_data, indexAxis} = dataset;
      const meta = chart.getDatasetMeta(datasetIndex);
      const data = _data || dataset.data;
      if (resolve([indexAxis, chart.options.indexAxis]) === 'y') {
        return;
      }
      if (meta.type !== 'line') {
        return;
      }
      const xAxis = chart.scales[meta.xAxisID];
      if (xAxis.type !== 'linear' && xAxis.type !== 'time') {
        return;
      }
      if (chart.options.parsing) {
        return;
      }
      let {start, count} = getStartAndCountOfVisiblePointsSimplified(meta, data);
      const threshold = options.threshold || 4 * availableWidth;
      if (count <= threshold) {
        cleanDecimatedDataset(dataset);
        return;
      }
      if (isNullOrUndef(_data)) {
        dataset._data = data;
        delete dataset.data;
        Object.defineProperty(dataset, 'data', {
          configurable: true,
          enumerable: true,
          get: function() {
            return this._decimated;
          },
          set: function(d) {
            this._data = d;
          }
        });
      }
      let decimated;
      switch (options.algorithm) {
      case 'lttb':
        decimated = lttbDecimation(data, start, count, availableWidth, options);
        break;
      case 'min-max':
        decimated = minMaxDecimation(data, start, count, availableWidth);
        break;
      default:
        throw new Error(`Unsupported decimation algorithm '${options.algorithm}'`);
      }
      dataset._decimated = decimated;
    });
  },
  destroy(chart) {
    cleanDecimatedData(chart);
  }
};

function getLineByIndex(chart, index) {
  const meta = chart.getDatasetMeta(index);
  const visible = meta && chart.isDatasetVisible(index);
  return visible ? meta.dataset : null;
}
function parseFillOption(line) {
  const options = line.options;
  const fillOption = options.fill;
  let fill = valueOrDefault(fillOption && fillOption.target, fillOption);
  if (fill === undefined) {
    fill = !!options.backgroundColor;
  }
  if (fill === false || fill === null) {
    return false;
  }
  if (fill === true) {
    return 'origin';
  }
  return fill;
}
function decodeFill(line, index, count) {
  const fill = parseFillOption(line);
  if (isObject(fill)) {
    return isNaN(fill.value) ? false : fill;
  }
  let target = parseFloat(fill);
  if (isNumberFinite(target) && Math.floor(target) === target) {
    if (fill[0] === '-' || fill[0] === '+') {
      target = index + target;
    }
    if (target === index || target < 0 || target >= count) {
      return false;
    }
    return target;
  }
  return ['origin', 'start', 'end', 'stack', 'shape'].indexOf(fill) >= 0 && fill;
}
function computeLinearBoundary(source) {
  const {scale = {}, fill} = source;
  let target = null;
  let horizontal;
  if (fill === 'start') {
    target = scale.bottom;
  } else if (fill === 'end') {
    target = scale.top;
  } else if (isObject(fill)) {
    target = scale.getPixelForValue(fill.value);
  } else if (scale.getBasePixel) {
    target = scale.getBasePixel();
  }
  if (isNumberFinite(target)) {
    horizontal = scale.isHorizontal();
    return {
      x: horizontal ? target : null,
      y: horizontal ? null : target
    };
  }
  return null;
}
class simpleArc {
  constructor(opts) {
    this.x = opts.x;
    this.y = opts.y;
    this.radius = opts.radius;
  }
  pathSegment(ctx, bounds, opts) {
    const {x, y, radius} = this;
    bounds = bounds || {start: 0, end: TAU};
    ctx.arc(x, y, radius, bounds.end, bounds.start, true);
    return !opts.bounds;
  }
  interpolate(point) {
    const {x, y, radius} = this;
    const angle = point.angle;
    return {
      x: x + Math.cos(angle) * radius,
      y: y + Math.sin(angle) * radius,
      angle
    };
  }
}
function computeCircularBoundary(source) {
  const {scale, fill} = source;
  const options = scale.options;
  const length = scale.getLabels().length;
  const target = [];
  const start = options.reverse ? scale.max : scale.min;
  const end = options.reverse ? scale.min : scale.max;
  let i, center, value;
  if (fill === 'start') {
    value = start;
  } else if (fill === 'end') {
    value = end;
  } else if (isObject(fill)) {
    value = fill.value;
  } else {
    value = scale.getBaseValue();
  }
  if (options.grid.circular) {
    center = scale.getPointPositionForValue(0, start);
    return new simpleArc({
      x: center.x,
      y: center.y,
      radius: scale.getDistanceFromCenterForValue(value)
    });
  }
  for (i = 0; i < length; ++i) {
    target.push(scale.getPointPositionForValue(i, value));
  }
  return target;
}
function computeBoundary(source) {
  const scale = source.scale || {};
  if (scale.getPointPositionForValue) {
    return computeCircularBoundary(source);
  }
  return computeLinearBoundary(source);
}
function findSegmentEnd(start, end, points) {
  for (;end > start; end--) {
    const point = points[end];
    if (!isNaN(point.x) && !isNaN(point.y)) {
      break;
    }
  }
  return end;
}
function pointsFromSegments(boundary, line) {
  const {x = null, y = null} = boundary || {};
  const linePoints = line.points;
  const points = [];
  line.segments.forEach(({start, end}) => {
    end = findSegmentEnd(start, end, linePoints);
    const first = linePoints[start];
    const last = linePoints[end];
    if (y !== null) {
      points.push({x: first.x, y});
      points.push({x: last.x, y});
    } else if (x !== null) {
      points.push({x, y: first.y});
      points.push({x, y: last.y});
    }
  });
  return points;
}
function buildStackLine(source) {
  const {chart, scale, index, line} = source;
  const points = [];
  const segments = line.segments;
  const sourcePoints = line.points;
  const linesBelow = getLinesBelow(chart, index);
  linesBelow.push(createBoundaryLine({x: null, y: scale.bottom}, line));
  for (let i = 0; i < segments.length; i++) {
    const segment = segments[i];
    for (let j = segment.start; j <= segment.end; j++) {
      addPointsBelow(points, sourcePoints[j], linesBelow);
    }
  }
  return new LineElement({points, options: {}});
}
const isLineAndNotInHideAnimation = (meta) => meta.type === 'line' && !meta.hidden;
function getLinesBelow(chart, index) {
  const below = [];
  const metas = chart.getSortedVisibleDatasetMetas();
  for (let i = 0; i < metas.length; i++) {
    const meta = metas[i];
    if (meta.index === index) {
      break;
    }
    if (isLineAndNotInHideAnimation(meta)) {
      below.unshift(meta.dataset);
    }
  }
  return below;
}
function addPointsBelow(points, sourcePoint, linesBelow) {
  const postponed = [];
  for (let j = 0; j < linesBelow.length; j++) {
    const line = linesBelow[j];
    const {first, last, point} = findPoint(line, sourcePoint, 'x');
    if (!point || (first && last)) {
      continue;
    }
    if (first) {
      postponed.unshift(point);
    } else {
      points.push(point);
      if (!last) {
        break;
      }
    }
  }
  points.push(...postponed);
}
function findPoint(line, sourcePoint, property) {
  const point = line.interpolate(sourcePoint, property);
  if (!point) {
    return {};
  }
  const pointValue = point[property];
  const segments = line.segments;
  const linePoints = line.points;
  let first = false;
  let last = false;
  for (let i = 0; i < segments.length; i++) {
    const segment = segments[i];
    const firstValue = linePoints[segment.start][property];
    const lastValue = linePoints[segment.end][property];
    if (pointValue >= firstValue && pointValue <= lastValue) {
      first = pointValue === firstValue;
      last = pointValue === lastValue;
      break;
    }
  }
  return {first, last, point};
}
function getTarget(source) {
  const {chart, fill, line} = source;
  if (isNumberFinite(fill)) {
    return getLineByIndex(chart, fill);
  }
  if (fill === 'stack') {
    return buildStackLine(source);
  }
  if (fill === 'shape') {
    return true;
  }
  const boundary = computeBoundary(source);
  if (boundary instanceof simpleArc) {
    return boundary;
  }
  return createBoundaryLine(boundary, line);
}
function createBoundaryLine(boundary, line) {
  let points = [];
  let _loop = false;
  if (isArray(boundary)) {
    _loop = true;
    points = boundary;
  } else {
    points = pointsFromSegments(boundary, line);
  }
  return points.length ? new LineElement({
    points,
    options: {tension: 0},
    _loop,
    _fullLoop: _loop
  }) : null;
}
function resolveTarget(sources, index, propagate) {
  const source = sources[index];
  let fill = source.fill;
  const visited = [index];
  let target;
  if (!propagate) {
    return fill;
  }
  while (fill !== false && visited.indexOf(fill) === -1) {
    if (!isNumberFinite(fill)) {
      return fill;
    }
    target = sources[fill];
    if (!target) {
      return false;
    }
    if (target.visible) {
      return fill;
    }
    visited.push(fill);
    fill = target.fill;
  }
  return false;
}
function _clip(ctx, target, clipY) {
  ctx.beginPath();
  target.path(ctx);
  ctx.lineTo(target.last().x, clipY);
  ctx.lineTo(target.first().x, clipY);
  ctx.closePath();
  ctx.clip();
}
function getBounds(property, first, last, loop) {
  if (loop) {
    return;
  }
  let start = first[property];
  let end = last[property];
  if (property === 'angle') {
    start = _normalizeAngle(start);
    end = _normalizeAngle(end);
  }
  return {property, start, end};
}
function _getEdge(a, b, prop, fn) {
  if (a && b) {
    return fn(a[prop], b[prop]);
  }
  return a ? a[prop] : b ? b[prop] : 0;
}
function _segments(line, target, property) {
  const segments = line.segments;
  const points = line.points;
  const tpoints = target.points;
  const parts = [];
  for (const segment of segments) {
    let {start, end} = segment;
    end = findSegmentEnd(start, end, points);
    const bounds = getBounds(property, points[start], points[end], segment.loop);
    if (!target.segments) {
      parts.push({
        source: segment,
        target: bounds,
        start: points[start],
        end: points[end]
      });
      continue;
    }
    const targetSegments = _boundSegments(target, bounds);
    for (const tgt of targetSegments) {
      const subBounds = getBounds(property, tpoints[tgt.start], tpoints[tgt.end], tgt.loop);
      const fillSources = _boundSegment(segment, points, subBounds);
      for (const fillSource of fillSources) {
        parts.push({
          source: fillSource,
          target: tgt,
          start: {
            [property]: _getEdge(bounds, subBounds, 'start', Math.max)
          },
          end: {
            [property]: _getEdge(bounds, subBounds, 'end', Math.min)
          }
        });
      }
    }
  }
  return parts;
}
function clipBounds(ctx, scale, bounds) {
  const {top, bottom} = scale.chart.chartArea;
  const {property, start, end} = bounds || {};
  if (property === 'x') {
    ctx.beginPath();
    ctx.rect(start, top, end - start, bottom - top);
    ctx.clip();
  }
}
function interpolatedLineTo(ctx, target, point, property) {
  const interpolatedPoint = target.interpolate(point, property);
  if (interpolatedPoint) {
    ctx.lineTo(interpolatedPoint.x, interpolatedPoint.y);
  }
}
function _fill(ctx, cfg) {
  const {line, target, property, color, scale} = cfg;
  const segments = _segments(line, target, property);
  for (const {source: src, target: tgt, start, end} of segments) {
    const {style: {backgroundColor = color} = {}} = src;
    const notShape = target !== true;
    ctx.save();
    ctx.fillStyle = backgroundColor;
    clipBounds(ctx, scale, notShape && getBounds(property, start, end));
    ctx.beginPath();
    const lineLoop = !!line.pathSegment(ctx, src);
    let loop;
    if (notShape) {
      if (lineLoop) {
        ctx.closePath();
      } else {
        interpolatedLineTo(ctx, target, end, property);
      }
      const targetLoop = !!target.pathSegment(ctx, tgt, {move: lineLoop, reverse: true});
      loop = lineLoop && targetLoop;
      if (!loop) {
        interpolatedLineTo(ctx, target, start, property);
      }
    }
    ctx.closePath();
    ctx.fill(loop ? 'evenodd' : 'nonzero');
    ctx.restore();
  }
}
function doFill(ctx, cfg) {
  const {line, target, above, below, area, scale} = cfg;
  const property = line._loop ? 'angle' : cfg.axis;
  ctx.save();
  if (property === 'x' && below !== above) {
    _clip(ctx, target, area.top);
    _fill(ctx, {line, target, color: above, scale, property});
    ctx.restore();
    ctx.save();
    _clip(ctx, target, area.bottom);
  }
  _fill(ctx, {line, target, color: below, scale, property});
  ctx.restore();
}
function drawfill(ctx, source, area) {
  const target = getTarget(source);
  const {line, scale, axis} = source;
  const lineOpts = line.options;
  const fillOption = lineOpts.fill;
  const color = lineOpts.backgroundColor;
  const {above = color, below = color} = fillOption || {};
  if (target && line.points.length) {
    clipArea(ctx, area);
    doFill(ctx, {line, target, above, below, area, scale, axis});
    unclipArea(ctx);
  }
}
var plugin_filler = {
  id: 'filler',
  afterDatasetsUpdate(chart, _args, options) {
    const count = (chart.data.datasets || []).length;
    const sources = [];
    let meta, i, line, source;
    for (i = 0; i < count; ++i) {
      meta = chart.getDatasetMeta(i);
      line = meta.dataset;
      source = null;
      if (line && line.options && line instanceof LineElement) {
        source = {
          visible: chart.isDatasetVisible(i),
          index: i,
          fill: decodeFill(line, i, count),
          chart,
          axis: meta.controller.options.indexAxis,
          scale: meta.vScale,
          line,
        };
      }
      meta.$filler = source;
      sources.push(source);
    }
    for (i = 0; i < count; ++i) {
      source = sources[i];
      if (!source || source.fill === false) {
        continue;
      }
      source.fill = resolveTarget(sources, i, options.propagate);
    }
  },
  beforeDraw(chart, _args, options) {
    const draw = options.drawTime === 'beforeDraw';
    const metasets = chart.getSortedVisibleDatasetMetas();
    const area = chart.chartArea;
    for (let i = metasets.length - 1; i >= 0; --i) {
      const source = metasets[i].$filler;
      if (!source) {
        continue;
      }
      source.line.updateControlPoints(area, source.axis);
      if (draw) {
        drawfill(chart.ctx, source, area);
      }
    }
  },
  beforeDatasetsDraw(chart, _args, options) {
    if (options.drawTime !== 'beforeDatasetsDraw') {
      return;
    }
    const metasets = chart.getSortedVisibleDatasetMetas();
    for (let i = metasets.length - 1; i >= 0; --i) {
      const source = metasets[i].$filler;
      if (source) {
        drawfill(chart.ctx, source, chart.chartArea);
      }
    }
  },
  beforeDatasetDraw(chart, args, options) {
    const source = args.meta.$filler;
    if (!source || source.fill === false || options.drawTime !== 'beforeDatasetDraw') {
      return;
    }
    drawfill(chart.ctx, source, chart.chartArea);
  },
  defaults: {
    propagate: true,
    drawTime: 'beforeDatasetDraw'
  }
};

const getBoxSize = (labelOpts, fontSize) => {
  let {boxHeight = fontSize, boxWidth = fontSize} = labelOpts;
  if (labelOpts.usePointStyle) {
    boxHeight = Math.min(boxHeight, fontSize);
    boxWidth = Math.min(boxWidth, fontSize);
  }
  return {
    boxWidth,
    boxHeight,
    itemHeight: Math.max(fontSize, boxHeight)
  };
};
const itemsEqual = (a, b) => a !== null && b !== null && a.datasetIndex === b.datasetIndex && a.index === b.index;
class Legend extends Element {
  constructor(config) {
    super();
    this._added = false;
    this.legendHitBoxes = [];
    this._hoveredItem = null;
    this.doughnutMode = false;
    this.chart = config.chart;
    this.options = config.options;
    this.ctx = config.ctx;
    this.legendItems = undefined;
    this.columnSizes = undefined;
    this.lineWidths = undefined;
    this.maxHeight = undefined;
    this.maxWidth = undefined;
    this.top = undefined;
    this.bottom = undefined;
    this.left = undefined;
    this.right = undefined;
    this.height = undefined;
    this.width = undefined;
    this._margins = undefined;
    this.position = undefined;
    this.weight = undefined;
    this.fullSize = undefined;
  }
  update(maxWidth, maxHeight, margins) {
    const me = this;
    me.maxWidth = maxWidth;
    me.maxHeight = maxHeight;
    me._margins = margins;
    me.setDimensions();
    me.buildLabels();
    me.fit();
  }
  setDimensions() {
    const me = this;
    if (me.isHorizontal()) {
      me.width = me.maxWidth;
      me.left = me._margins.left;
      me.right = me.width;
    } else {
      me.height = me.maxHeight;
      me.top = me._margins.top;
      me.bottom = me.height;
    }
  }
  buildLabels() {
    const me = this;
    const labelOpts = me.options.labels || {};
    let legendItems = callback(labelOpts.generateLabels, [me.chart], me) || [];
    if (labelOpts.filter) {
      legendItems = legendItems.filter((item) => labelOpts.filter(item, me.chart.data));
    }
    if (labelOpts.sort) {
      legendItems = legendItems.sort((a, b) => labelOpts.sort(a, b, me.chart.data));
    }
    if (me.options.reverse) {
      legendItems.reverse();
    }
    me.legendItems = legendItems;
  }
  fit() {
    const me = this;
    const {options, ctx} = me;
    if (!options.display) {
      me.width = me.height = 0;
      return;
    }
    const labelOpts = options.labels;
    const labelFont = toFont(labelOpts.font);
    const fontSize = labelFont.size;
    const titleHeight = me._computeTitleHeight();
    const {boxWidth, itemHeight} = getBoxSize(labelOpts, fontSize);
    let width, height;
    ctx.font = labelFont.string;
    if (me.isHorizontal()) {
      width = me.maxWidth;
      height = me._fitRows(titleHeight, fontSize, boxWidth, itemHeight) + 10;
    } else {
      height = me.maxHeight;
      width = me._fitCols(titleHeight, fontSize, boxWidth, itemHeight) + 10;
    }
    me.width = Math.min(width, options.maxWidth || me.maxWidth);
    me.height = Math.min(height, options.maxHeight || me.maxHeight);
  }
  _fitRows(titleHeight, fontSize, boxWidth, itemHeight) {
    const me = this;
    const {ctx, maxWidth, options: {labels: {padding}}} = me;
    const hitboxes = me.legendHitBoxes = [];
    const lineWidths = me.lineWidths = [0];
    const lineHeight = itemHeight + padding;
    let totalHeight = titleHeight;
    ctx.textAlign = 'left';
    ctx.textBaseline = 'middle';
    let row = -1;
    let top = -lineHeight;
    me.legendItems.forEach((legendItem, i) => {
      const itemWidth = boxWidth + (fontSize / 2) + ctx.measureText(legendItem.text).width;
      if (i === 0 || lineWidths[lineWidths.length - 1] + itemWidth + 2 * padding > maxWidth) {
        totalHeight += lineHeight;
        lineWidths[lineWidths.length - (i > 0 ? 0 : 1)] = 0;
        top += lineHeight;
        row++;
      }
      hitboxes[i] = {left: 0, top, row, width: itemWidth, height: itemHeight};
      lineWidths[lineWidths.length - 1] += itemWidth + padding;
    });
    return totalHeight;
  }
  _fitCols(titleHeight, fontSize, boxWidth, itemHeight) {
    const me = this;
    const {ctx, maxHeight, options: {labels: {padding}}} = me;
    const hitboxes = me.legendHitBoxes = [];
    const columnSizes = me.columnSizes = [];
    const heightLimit = maxHeight - titleHeight;
    let totalWidth = padding;
    let currentColWidth = 0;
    let currentColHeight = 0;
    let left = 0;
    let col = 0;
    me.legendItems.forEach((legendItem, i) => {
      const itemWidth = boxWidth + (fontSize / 2) + ctx.measureText(legendItem.text).width;
      if (i > 0 && currentColHeight + itemHeight + 2 * padding > heightLimit) {
        totalWidth += currentColWidth + padding;
        columnSizes.push({width: currentColWidth, height: currentColHeight});
        left += currentColWidth + padding;
        col++;
        currentColWidth = currentColHeight = 0;
      }
      hitboxes[i] = {left, top: currentColHeight, col, width: itemWidth, height: itemHeight};
      currentColWidth = Math.max(currentColWidth, itemWidth);
      currentColHeight += itemHeight + padding;
    });
    totalWidth += currentColWidth;
    columnSizes.push({width: currentColWidth, height: currentColHeight});
    return totalWidth;
  }
  adjustHitBoxes() {
    const me = this;
    if (!me.options.display) {
      return;
    }
    const titleHeight = me._computeTitleHeight();
    const {legendHitBoxes: hitboxes, options: {align, labels: {padding}, rtl}} = me;
    const rtlHelper = getRtlAdapter(rtl, me.left, me.width);
    if (this.isHorizontal()) {
      let row = 0;
      let left = _alignStartEnd(align, me.left + padding, me.right - me.lineWidths[row]);
      for (const hitbox of hitboxes) {
        if (row !== hitbox.row) {
          row = hitbox.row;
          left = _alignStartEnd(align, me.left + padding, me.right - me.lineWidths[row]);
        }
        hitbox.top += me.top + titleHeight + padding;
        hitbox.left = rtlHelper.leftForLtr(rtlHelper.x(left), hitbox.width);
        left += hitbox.width + padding;
      }
    } else {
      let col = 0;
      let top = _alignStartEnd(align, me.top + titleHeight + padding, me.bottom - me.columnSizes[col].height);
      for (const hitbox of hitboxes) {
        if (hitbox.col !== col) {
          col = hitbox.col;
          top = _alignStartEnd(align, me.top + titleHeight + padding, me.bottom - me.columnSizes[col].height);
        }
        hitbox.top = top;
        hitbox.left += me.left + padding;
        hitbox.left = rtlHelper.leftForLtr(rtlHelper.x(hitbox.left), hitbox.width);
        top += hitbox.height + padding;
      }
    }
  }
  isHorizontal() {
    return this.options.position === 'top' || this.options.position === 'bottom';
  }
  draw() {
    const me = this;
    if (me.options.display) {
      const ctx = me.ctx;
      clipArea(ctx, me);
      me._draw();
      unclipArea(ctx);
    }
  }
  _draw() {
    const me = this;
    const {options: opts, columnSizes, lineWidths, ctx} = me;
    const {align, labels: labelOpts} = opts;
    const defaultColor = defaults.color;
    const rtlHelper = getRtlAdapter(opts.rtl, me.left, me.width);
    const labelFont = toFont(labelOpts.font);
    const {color: fontColor, padding} = labelOpts;
    const fontSize = labelFont.size;
    const halfFontSize = fontSize / 2;
    let cursor;
    me.drawTitle();
    ctx.textAlign = rtlHelper.textAlign('left');
    ctx.textBaseline = 'middle';
    ctx.lineWidth = 0.5;
    ctx.font = labelFont.string;
    const {boxWidth, boxHeight, itemHeight} = getBoxSize(labelOpts, fontSize);
    const drawLegendBox = function(x, y, legendItem) {
      if (isNaN(boxWidth) || boxWidth <= 0 || isNaN(boxHeight) || boxHeight < 0) {
        return;
      }
      ctx.save();
      const lineWidth = valueOrDefault(legendItem.lineWidth, 1);
      ctx.fillStyle = valueOrDefault(legendItem.fillStyle, defaultColor);
      ctx.lineCap = valueOrDefault(legendItem.lineCap, 'butt');
      ctx.lineDashOffset = valueOrDefault(legendItem.lineDashOffset, 0);
      ctx.lineJoin = valueOrDefault(legendItem.lineJoin, 'miter');
      ctx.lineWidth = lineWidth;
      ctx.strokeStyle = valueOrDefault(legendItem.strokeStyle, defaultColor);
      ctx.setLineDash(valueOrDefault(legendItem.lineDash, []));
      if (labelOpts.usePointStyle) {
        const drawOptions = {
          radius: boxWidth * Math.SQRT2 / 2,
          pointStyle: legendItem.pointStyle,
          rotation: legendItem.rotation,
          borderWidth: lineWidth
        };
        const centerX = rtlHelper.xPlus(x, boxWidth / 2);
        const centerY = y + halfFontSize;
        drawPoint(ctx, drawOptions, centerX, centerY);
      } else {
        const yBoxTop = y + Math.max((fontSize - boxHeight) / 2, 0);
        const xBoxLeft = rtlHelper.leftForLtr(x, boxWidth);
        const borderRadius = toTRBLCorners(legendItem.borderRadius);
        ctx.beginPath();
        if (Object.values(borderRadius).some(v => v !== 0)) {
          addRoundedRectPath(ctx, {
            x: xBoxLeft,
            y: yBoxTop,
            w: boxWidth,
            h: boxHeight,
            radius: borderRadius,
          });
        } else {
          ctx.rect(xBoxLeft, yBoxTop, boxWidth, boxHeight);
        }
        ctx.fill();
        if (lineWidth !== 0) {
          ctx.stroke();
        }
      }
      ctx.restore();
    };
    const fillText = function(x, y, legendItem) {
      renderText(ctx, legendItem.text, x, y + (itemHeight / 2), labelFont, {
        strikethrough: legendItem.hidden,
        textAlign: rtlHelper.textAlign(legendItem.textAlign)
      });
    };
    const isHorizontal = me.isHorizontal();
    const titleHeight = this._computeTitleHeight();
    if (isHorizontal) {
      cursor = {
        x: _alignStartEnd(align, me.left + padding, me.right - lineWidths[0]),
        y: me.top + padding + titleHeight,
        line: 0
      };
    } else {
      cursor = {
        x: me.left + padding,
        y: _alignStartEnd(align, me.top + titleHeight + padding, me.bottom - columnSizes[0].height),
        line: 0
      };
    }
    overrideTextDirection(me.ctx, opts.textDirection);
    const lineHeight = itemHeight + padding;
    me.legendItems.forEach((legendItem, i) => {
      ctx.strokeStyle = legendItem.fontColor || fontColor;
      ctx.fillStyle = legendItem.fontColor || fontColor;
      const textWidth = ctx.measureText(legendItem.text).width;
      const textAlign = rtlHelper.textAlign(legendItem.textAlign || (legendItem.textAlign = labelOpts.textAlign));
      const width = boxWidth + halfFontSize + textWidth;
      let x = cursor.x;
      let y = cursor.y;
      rtlHelper.setWidth(me.width);
      if (isHorizontal) {
        if (i > 0 && x + width + padding > me.right) {
          y = cursor.y += lineHeight;
          cursor.line++;
          x = cursor.x = _alignStartEnd(align, me.left + padding, me.right - lineWidths[cursor.line]);
        }
      } else if (i > 0 && y + lineHeight > me.bottom) {
        x = cursor.x = x + columnSizes[cursor.line].width + padding;
        cursor.line++;
        y = cursor.y = _alignStartEnd(align, me.top + titleHeight + padding, me.bottom - columnSizes[cursor.line].height);
      }
      const realX = rtlHelper.x(x);
      drawLegendBox(realX, y, legendItem);
      x = _textX(textAlign, x + boxWidth + halfFontSize, isHorizontal ? x + width : me.right, opts.rtl);
      fillText(rtlHelper.x(x), y, legendItem);
      if (isHorizontal) {
        cursor.x += width + padding;
      } else {
        cursor.y += lineHeight;
      }
    });
    restoreTextDirection(me.ctx, opts.textDirection);
  }
  drawTitle() {
    const me = this;
    const opts = me.options;
    const titleOpts = opts.title;
    const titleFont = toFont(titleOpts.font);
    const titlePadding = toPadding(titleOpts.padding);
    if (!titleOpts.display) {
      return;
    }
    const rtlHelper = getRtlAdapter(opts.rtl, me.left, me.width);
    const ctx = me.ctx;
    const position = titleOpts.position;
    const halfFontSize = titleFont.size / 2;
    const topPaddingPlusHalfFontSize = titlePadding.top + halfFontSize;
    let y;
    let left = me.left;
    let maxWidth = me.width;
    if (this.isHorizontal()) {
      maxWidth = Math.max(...me.lineWidths);
      y = me.top + topPaddingPlusHalfFontSize;
      left = _alignStartEnd(opts.align, left, me.right - maxWidth);
    } else {
      const maxHeight = me.columnSizes.reduce((acc, size) => Math.max(acc, size.height), 0);
      y = topPaddingPlusHalfFontSize + _alignStartEnd(opts.align, me.top, me.bottom - maxHeight - opts.labels.padding - me._computeTitleHeight());
    }
    const x = _alignStartEnd(position, left, left + maxWidth);
    ctx.textAlign = rtlHelper.textAlign(_toLeftRightCenter(position));
    ctx.textBaseline = 'middle';
    ctx.strokeStyle = titleOpts.color;
    ctx.fillStyle = titleOpts.color;
    ctx.font = titleFont.string;
    renderText(ctx, titleOpts.text, x, y, titleFont);
  }
  _computeTitleHeight() {
    const titleOpts = this.options.title;
    const titleFont = toFont(titleOpts.font);
    const titlePadding = toPadding(titleOpts.padding);
    return titleOpts.display ? titleFont.lineHeight + titlePadding.height : 0;
  }
  _getLegendItemAt(x, y) {
    const me = this;
    let i, hitBox, lh;
    if (x >= me.left && x <= me.right && y >= me.top && y <= me.bottom) {
      lh = me.legendHitBoxes;
      for (i = 0; i < lh.length; ++i) {
        hitBox = lh[i];
        if (x >= hitBox.left && x <= hitBox.left + hitBox.width && y >= hitBox.top && y <= hitBox.top + hitBox.height) {
          return me.legendItems[i];
        }
      }
    }
    return null;
  }
  handleEvent(e) {
    const me = this;
    const opts = me.options;
    if (!isListened(e.type, opts)) {
      return;
    }
    const hoveredItem = me._getLegendItemAt(e.x, e.y);
    if (e.type === 'mousemove') {
      const previous = me._hoveredItem;
      const sameItem = itemsEqual(previous, hoveredItem);
      if (previous && !sameItem) {
        callback(opts.onLeave, [e, previous, me], me);
      }
      me._hoveredItem = hoveredItem;
      if (hoveredItem && !sameItem) {
        callback(opts.onHover, [e, hoveredItem, me], me);
      }
    } else if (hoveredItem) {
      callback(opts.onClick, [e, hoveredItem, me], me);
    }
  }
}
function isListened(type, opts) {
  if (type === 'mousemove' && (opts.onHover || opts.onLeave)) {
    return true;
  }
  if (opts.onClick && (type === 'click' || type === 'mouseup')) {
    return true;
  }
  return false;
}
var plugin_legend = {
  id: 'legend',
  _element: Legend,
  start(chart, _args, options) {
    const legend = chart.legend = new Legend({ctx: chart.ctx, options, chart});
    layouts.configure(chart, legend, options);
    layouts.addBox(chart, legend);
  },
  stop(chart) {
    layouts.removeBox(chart, chart.legend);
    delete chart.legend;
  },
  beforeUpdate(chart, _args, options) {
    const legend = chart.legend;
    layouts.configure(chart, legend, options);
    legend.options = options;
  },
  afterUpdate(chart) {
    const legend = chart.legend;
    legend.buildLabels();
    legend.adjustHitBoxes();
  },
  afterEvent(chart, args) {
    if (!args.replay) {
      chart.legend.handleEvent(args.event);
    }
  },
  defaults: {
    display: true,
    position: 'top',
    align: 'center',
    fullSize: true,
    reverse: false,
    weight: 1000,
    onClick(e, legendItem, legend) {
      const index = legendItem.datasetIndex;
      const ci = legend.chart;
      if (ci.isDatasetVisible(index)) {
        ci.hide(index);
        legendItem.hidden = true;
      } else {
        ci.show(index);
        legendItem.hidden = false;
      }
    },
    onHover: null,
    onLeave: null,
    labels: {
      color: (ctx) => ctx.chart.options.color,
      boxWidth: 40,
      padding: 10,
      generateLabels(chart) {
        const datasets = chart.data.datasets;
        const {labels: {usePointStyle, pointStyle, textAlign, color}} = chart.legend.options;
        return chart._getSortedDatasetMetas().map((meta) => {
          const style = meta.controller.getStyle(usePointStyle ? 0 : undefined);
          const borderWidth = toPadding(style.borderWidth);
          return {
            text: datasets[meta.index].label,
            fillStyle: style.backgroundColor,
            fontColor: color,
            hidden: !meta.visible,
            lineCap: style.borderCapStyle,
            lineDash: style.borderDash,
            lineDashOffset: style.borderDashOffset,
            lineJoin: style.borderJoinStyle,
            lineWidth: (borderWidth.width + borderWidth.height) / 4,
            strokeStyle: style.borderColor,
            pointStyle: pointStyle || style.pointStyle,
            rotation: style.rotation,
            textAlign: textAlign || style.textAlign,
            borderRadius: 0,
            datasetIndex: meta.index
          };
        }, this);
      }
    },
    title: {
      color: (ctx) => ctx.chart.options.color,
      display: false,
      position: 'center',
      text: '',
    }
  },
  descriptors: {
    _scriptable: (name) => !name.startsWith('on'),
    labels: {
      _scriptable: (name) => !['generateLabels', 'filter', 'sort'].includes(name),
    }
  },
};

class Title extends Element {
  constructor(config) {
    super();
    this.chart = config.chart;
    this.options = config.options;
    this.ctx = config.ctx;
    this._padding = undefined;
    this.top = undefined;
    this.bottom = undefined;
    this.left = undefined;
    this.right = undefined;
    this.width = undefined;
    this.height = undefined;
    this.position = undefined;
    this.weight = undefined;
    this.fullSize = undefined;
  }
  update(maxWidth, maxHeight) {
    const me = this;
    const opts = me.options;
    me.left = 0;
    me.top = 0;
    if (!opts.display) {
      me.width = me.height = me.right = me.bottom = 0;
      return;
    }
    me.width = me.right = maxWidth;
    me.height = me.bottom = maxHeight;
    const lineCount = isArray(opts.text) ? opts.text.length : 1;
    me._padding = toPadding(opts.padding);
    const textSize = lineCount * toFont(opts.font).lineHeight + me._padding.height;
    if (me.isHorizontal()) {
      me.height = textSize;
    } else {
      me.width = textSize;
    }
  }
  isHorizontal() {
    const pos = this.options.position;
    return pos === 'top' || pos === 'bottom';
  }
  _drawArgs(offset) {
    const {top, left, bottom, right, options} = this;
    const align = options.align;
    let rotation = 0;
    let maxWidth, titleX, titleY;
    if (this.isHorizontal()) {
      titleX = _alignStartEnd(align, left, right);
      titleY = top + offset;
      maxWidth = right - left;
    } else {
      if (options.position === 'left') {
        titleX = left + offset;
        titleY = _alignStartEnd(align, bottom, top);
        rotation = PI * -0.5;
      } else {
        titleX = right - offset;
        titleY = _alignStartEnd(align, top, bottom);
        rotation = PI * 0.5;
      }
      maxWidth = bottom - top;
    }
    return {titleX, titleY, maxWidth, rotation};
  }
  draw() {
    const me = this;
    const ctx = me.ctx;
    const opts = me.options;
    if (!opts.display) {
      return;
    }
    const fontOpts = toFont(opts.font);
    const lineHeight = fontOpts.lineHeight;
    const offset = lineHeight / 2 + me._padding.top;
    const {titleX, titleY, maxWidth, rotation} = me._drawArgs(offset);
    renderText(ctx, opts.text, 0, 0, fontOpts, {
      color: opts.color,
      maxWidth,
      rotation,
      textAlign: _toLeftRightCenter(opts.align),
      textBaseline: 'middle',
      translation: [titleX, titleY],
    });
  }
}
function createTitle(chart, titleOpts) {
  const title = new Title({
    ctx: chart.ctx,
    options: titleOpts,
    chart
  });
  layouts.configure(chart, title, titleOpts);
  layouts.addBox(chart, title);
  chart.titleBlock = title;
}
var plugin_title = {
  id: 'title',
  _element: Title,
  start(chart, _args, options) {
    createTitle(chart, options);
  },
  stop(chart) {
    const titleBlock = chart.titleBlock;
    layouts.removeBox(chart, titleBlock);
    delete chart.titleBlock;
  },
  beforeUpdate(chart, _args, options) {
    const title = chart.titleBlock;
    layouts.configure(chart, title, options);
    title.options = options;
  },
  defaults: {
    align: 'center',
    display: false,
    font: {
      weight: 'bold',
    },
    fullSize: true,
    padding: 10,
    position: 'top',
    text: '',
    weight: 2000
  },
  defaultRoutes: {
    color: 'color'
  },
  descriptors: {
    _scriptable: true,
    _indexable: false,
  },
};

const map = new WeakMap();
var plugin_subtitle = {
  id: 'subtitle',
  start(chart, _args, options) {
    const title = new Title({
      ctx: chart.ctx,
      options,
      chart
    });
    layouts.configure(chart, title, options);
    layouts.addBox(chart, title);
    map.set(chart, title);
  },
  stop(chart) {
    layouts.removeBox(chart, map.get(chart));
    map.delete(chart);
  },
  beforeUpdate(chart, _args, options) {
    const title = map.get(chart);
    layouts.configure(chart, title, options);
    title.options = options;
  },
  defaults: {
    align: 'center',
    display: false,
    font: {
      weight: 'normal',
    },
    fullSize: true,
    padding: 0,
    position: 'top',
    text: '',
    weight: 1500
  },
  defaultRoutes: {
    color: 'color'
  },
  descriptors: {
    _scriptable: true,
    _indexable: false,
  },
};

const positioners = {
  average(items) {
    if (!items.length) {
      return false;
    }
    let i, len;
    let x = 0;
    let y = 0;
    let count = 0;
    for (i = 0, len = items.length; i < len; ++i) {
      const el = items[i].element;
      if (el && el.hasValue()) {
        const pos = el.tooltipPosition();
        x += pos.x;
        y += pos.y;
        ++count;
      }
    }
    return {
      x: x / count,
      y: y / count
    };
  },
  nearest(items, eventPosition) {
    if (!items.length) {
      return false;
    }
    let x = eventPosition.x;
    let y = eventPosition.y;
    let minDistance = Number.POSITIVE_INFINITY;
    let i, len, nearestElement;
    for (i = 0, len = items.length; i < len; ++i) {
      const el = items[i].element;
      if (el && el.hasValue()) {
        const center = el.getCenterPoint();
        const d = distanceBetweenPoints(eventPosition, center);
        if (d < minDistance) {
          minDistance = d;
          nearestElement = el;
        }
      }
    }
    if (nearestElement) {
      const tp = nearestElement.tooltipPosition();
      x = tp.x;
      y = tp.y;
    }
    return {
      x,
      y
    };
  }
};
function pushOrConcat(base, toPush) {
  if (toPush) {
    if (isArray(toPush)) {
      Array.prototype.push.apply(base, toPush);
    } else {
      base.push(toPush);
    }
  }
  return base;
}
function splitNewlines(str) {
  if ((typeof str === 'string' || str instanceof String) && str.indexOf('\n') > -1) {
    return str.split('\n');
  }
  return str;
}
function createTooltipItem(chart, item) {
  const {element, datasetIndex, index} = item;
  const controller = chart.getDatasetMeta(datasetIndex).controller;
  const {label, value} = controller.getLabelAndValue(index);
  return {
    chart,
    label,
    parsed: controller.getParsed(index),
    raw: chart.data.datasets[datasetIndex].data[index],
    formattedValue: value,
    dataset: controller.getDataset(),
    dataIndex: index,
    datasetIndex,
    element
  };
}
function getTooltipSize(tooltip, options) {
  const ctx = tooltip._chart.ctx;
  const {body, footer, title} = tooltip;
  const {boxWidth, boxHeight} = options;
  const bodyFont = toFont(options.bodyFont);
  const titleFont = toFont(options.titleFont);
  const footerFont = toFont(options.footerFont);
  const titleLineCount = title.length;
  const footerLineCount = footer.length;
  const bodyLineItemCount = body.length;
  const padding = toPadding(options.padding);
  let height = padding.height;
  let width = 0;
  let combinedBodyLength = body.reduce((count, bodyItem) => count + bodyItem.before.length + bodyItem.lines.length + bodyItem.after.length, 0);
  combinedBodyLength += tooltip.beforeBody.length + tooltip.afterBody.length;
  if (titleLineCount) {
    height += titleLineCount * titleFont.lineHeight
			+ (titleLineCount - 1) * options.titleSpacing
			+ options.titleMarginBottom;
  }
  if (combinedBodyLength) {
    const bodyLineHeight = options.displayColors ? Math.max(boxHeight, bodyFont.lineHeight) : bodyFont.lineHeight;
    height += bodyLineItemCount * bodyLineHeight
			+ (combinedBodyLength - bodyLineItemCount) * bodyFont.lineHeight
			+ (combinedBodyLength - 1) * options.bodySpacing;
  }
  if (footerLineCount) {
    height += options.footerMarginTop
			+ footerLineCount * footerFont.lineHeight
			+ (footerLineCount - 1) * options.footerSpacing;
  }
  let widthPadding = 0;
  const maxLineWidth = function(line) {
    width = Math.max(width, ctx.measureText(line).width + widthPadding);
  };
  ctx.save();
  ctx.font = titleFont.string;
  each(tooltip.title, maxLineWidth);
  ctx.font = bodyFont.string;
  each(tooltip.beforeBody.concat(tooltip.afterBody), maxLineWidth);
  widthPadding = options.displayColors ? (boxWidth + 2) : 0;
  each(body, (bodyItem) => {
    each(bodyItem.before, maxLineWidth);
    each(bodyItem.lines, maxLineWidth);
    each(bodyItem.after, maxLineWidth);
  });
  widthPadding = 0;
  ctx.font = footerFont.string;
  each(tooltip.footer, maxLineWidth);
  ctx.restore();
  width += padding.width;
  return {width, height};
}
function determineYAlign(chart, size) {
  const {y, height} = size;
  if (y < height / 2) {
    return 'top';
  } else if (y > (chart.height - height / 2)) {
    return 'bottom';
  }
  return 'center';
}
function doesNotFitWithAlign(xAlign, chart, options, size) {
  const {x, width} = size;
  const caret = options.caretSize + options.caretPadding;
  if (xAlign === 'left' && x + width + caret > chart.width) {
    return true;
  }
  if (xAlign === 'right' && x - width - caret < 0) {
    return true;
  }
}
function determineXAlign(chart, options, size, yAlign) {
  const {x, width} = size;
  const {width: chartWidth, chartArea: {left, right}} = chart;
  let xAlign = 'center';
  if (yAlign === 'center') {
    xAlign = x <= (left + right) / 2 ? 'left' : 'right';
  } else if (x <= width / 2) {
    xAlign = 'left';
  } else if (x >= chartWidth - width / 2) {
    xAlign = 'right';
  }
  if (doesNotFitWithAlign(xAlign, chart, options, size)) {
    xAlign = 'center';
  }
  return xAlign;
}
function determineAlignment(chart, options, size) {
  const yAlign = options.yAlign || determineYAlign(chart, size);
  return {
    xAlign: options.xAlign || determineXAlign(chart, options, size, yAlign),
    yAlign
  };
}
function alignX(size, xAlign) {
  let {x, width} = size;
  if (xAlign === 'right') {
    x -= width;
  } else if (xAlign === 'center') {
    x -= (width / 2);
  }
  return x;
}
function alignY(size, yAlign, paddingAndSize) {
  let {y, height} = size;
  if (yAlign === 'top') {
    y += paddingAndSize;
  } else if (yAlign === 'bottom') {
    y -= height + paddingAndSize;
  } else {
    y -= (height / 2);
  }
  return y;
}
function getBackgroundPoint(options, size, alignment, chart) {
  const {caretSize, caretPadding, cornerRadius} = options;
  const {xAlign, yAlign} = alignment;
  const paddingAndSize = caretSize + caretPadding;
  const radiusAndPadding = cornerRadius + caretPadding;
  let x = alignX(size, xAlign);
  const y = alignY(size, yAlign, paddingAndSize);
  if (yAlign === 'center') {
    if (xAlign === 'left') {
      x += paddingAndSize;
    } else if (xAlign === 'right') {
      x -= paddingAndSize;
    }
  } else if (xAlign === 'left') {
    x -= radiusAndPadding;
  } else if (xAlign === 'right') {
    x += radiusAndPadding;
  }
  return {
    x: _limitValue(x, 0, chart.width - size.width),
    y: _limitValue(y, 0, chart.height - size.height)
  };
}
function getAlignedX(tooltip, align, options) {
  const padding = toPadding(options.padding);
  return align === 'center'
    ? tooltip.x + tooltip.width / 2
    : align === 'right'
      ? tooltip.x + tooltip.width - padding.right
      : tooltip.x + padding.left;
}
function getBeforeAfterBodyLines(callback) {
  return pushOrConcat([], splitNewlines(callback));
}
function createTooltipContext(parent, tooltip, tooltipItems) {
  return Object.assign(Object.create(parent), {
    tooltip,
    tooltipItems,
    type: 'tooltip'
  });
}
function overrideCallbacks(callbacks, context) {
  const override = context && context.dataset && context.dataset.tooltip && context.dataset.tooltip.callbacks;
  return override ? callbacks.override(override) : callbacks;
}
class Tooltip extends Element {
  constructor(config) {
    super();
    this.opacity = 0;
    this._active = [];
    this._chart = config._chart;
    this._eventPosition = undefined;
    this._size = undefined;
    this._cachedAnimations = undefined;
    this._tooltipItems = [];
    this.$animations = undefined;
    this.$context = undefined;
    this.options = config.options;
    this.dataPoints = undefined;
    this.title = undefined;
    this.beforeBody = undefined;
    this.body = undefined;
    this.afterBody = undefined;
    this.footer = undefined;
    this.xAlign = undefined;
    this.yAlign = undefined;
    this.x = undefined;
    this.y = undefined;
    this.height = undefined;
    this.width = undefined;
    this.caretX = undefined;
    this.caretY = undefined;
    this.labelColors = undefined;
    this.labelPointStyles = undefined;
    this.labelTextColors = undefined;
  }
  initialize(options) {
    this.options = options;
    this._cachedAnimations = undefined;
    this.$context = undefined;
  }
  _resolveAnimations() {
    const me = this;
    const cached = me._cachedAnimations;
    if (cached) {
      return cached;
    }
    const chart = me._chart;
    const options = me.options.setContext(me.getContext());
    const opts = options.enabled && chart.options.animation && options.animations;
    const animations = new Animations(me._chart, opts);
    if (opts._cacheable) {
      me._cachedAnimations = Object.freeze(animations);
    }
    return animations;
  }
  getContext() {
    const me = this;
    return me.$context ||
			(me.$context = createTooltipContext(me._chart.getContext(), me, me._tooltipItems));
  }
  getTitle(context, options) {
    const me = this;
    const {callbacks} = options;
    const beforeTitle = callbacks.beforeTitle.apply(me, [context]);
    const title = callbacks.title.apply(me, [context]);
    const afterTitle = callbacks.afterTitle.apply(me, [context]);
    let lines = [];
    lines = pushOrConcat(lines, splitNewlines(beforeTitle));
    lines = pushOrConcat(lines, splitNewlines(title));
    lines = pushOrConcat(lines, splitNewlines(afterTitle));
    return lines;
  }
  getBeforeBody(tooltipItems, options) {
    return getBeforeAfterBodyLines(options.callbacks.beforeBody.apply(this, [tooltipItems]));
  }
  getBody(tooltipItems, options) {
    const me = this;
    const {callbacks} = options;
    const bodyItems = [];
    each(tooltipItems, (context) => {
      const bodyItem = {
        before: [],
        lines: [],
        after: []
      };
      const scoped = overrideCallbacks(callbacks, context);
      pushOrConcat(bodyItem.before, splitNewlines(scoped.beforeLabel.call(me, context)));
      pushOrConcat(bodyItem.lines, scoped.label.call(me, context));
      pushOrConcat(bodyItem.after, splitNewlines(scoped.afterLabel.call(me, context)));
      bodyItems.push(bodyItem);
    });
    return bodyItems;
  }
  getAfterBody(tooltipItems, options) {
    return getBeforeAfterBodyLines(options.callbacks.afterBody.apply(this, [tooltipItems]));
  }
  getFooter(tooltipItems, options) {
    const me = this;
    const {callbacks} = options;
    const beforeFooter = callbacks.beforeFooter.apply(me, [tooltipItems]);
    const footer = callbacks.footer.apply(me, [tooltipItems]);
    const afterFooter = callbacks.afterFooter.apply(me, [tooltipItems]);
    let lines = [];
    lines = pushOrConcat(lines, splitNewlines(beforeFooter));
    lines = pushOrConcat(lines, splitNewlines(footer));
    lines = pushOrConcat(lines, splitNewlines(afterFooter));
    return lines;
  }
  _createItems(options) {
    const me = this;
    const active = me._active;
    const data = me._chart.data;
    const labelColors = [];
    const labelPointStyles = [];
    const labelTextColors = [];
    let tooltipItems = [];
    let i, len;
    for (i = 0, len = active.length; i < len; ++i) {
      tooltipItems.push(createTooltipItem(me._chart, active[i]));
    }
    if (options.filter) {
      tooltipItems = tooltipItems.filter((element, index, array) => options.filter(element, index, array, data));
    }
    if (options.itemSort) {
      tooltipItems = tooltipItems.sort((a, b) => options.itemSort(a, b, data));
    }
    each(tooltipItems, (context) => {
      const scoped = overrideCallbacks(options.callbacks, context);
      labelColors.push(scoped.labelColor.call(me, context));
      labelPointStyles.push(scoped.labelPointStyle.call(me, context));
      labelTextColors.push(scoped.labelTextColor.call(me, context));
    });
    me.labelColors = labelColors;
    me.labelPointStyles = labelPointStyles;
    me.labelTextColors = labelTextColors;
    me.dataPoints = tooltipItems;
    return tooltipItems;
  }
  update(changed, replay) {
    const me = this;
    const options = me.options.setContext(me.getContext());
    const active = me._active;
    let properties;
    let tooltipItems = [];
    if (!active.length) {
      if (me.opacity !== 0) {
        properties = {
          opacity: 0
        };
      }
    } else {
      const position = positioners[options.position].call(me, active, me._eventPosition);
      tooltipItems = me._createItems(options);
      me.title = me.getTitle(tooltipItems, options);
      me.beforeBody = me.getBeforeBody(tooltipItems, options);
      me.body = me.getBody(tooltipItems, options);
      me.afterBody = me.getAfterBody(tooltipItems, options);
      me.footer = me.getFooter(tooltipItems, options);
      const size = me._size = getTooltipSize(me, options);
      const positionAndSize = Object.assign({}, position, size);
      const alignment = determineAlignment(me._chart, options, positionAndSize);
      const backgroundPoint = getBackgroundPoint(options, positionAndSize, alignment, me._chart);
      me.xAlign = alignment.xAlign;
      me.yAlign = alignment.yAlign;
      properties = {
        opacity: 1,
        x: backgroundPoint.x,
        y: backgroundPoint.y,
        width: size.width,
        height: size.height,
        caretX: position.x,
        caretY: position.y
      };
    }
    me._tooltipItems = tooltipItems;
    me.$context = undefined;
    if (properties) {
      me._resolveAnimations().update(me, properties);
    }
    if (changed && options.external) {
      options.external.call(me, {chart: me._chart, tooltip: me, replay});
    }
  }
  drawCaret(tooltipPoint, ctx, size, options) {
    const caretPosition = this.getCaretPosition(tooltipPoint, size, options);
    ctx.lineTo(caretPosition.x1, caretPosition.y1);
    ctx.lineTo(caretPosition.x2, caretPosition.y2);
    ctx.lineTo(caretPosition.x3, caretPosition.y3);
  }
  getCaretPosition(tooltipPoint, size, options) {
    const {xAlign, yAlign} = this;
    const {cornerRadius, caretSize} = options;
    const {x: ptX, y: ptY} = tooltipPoint;
    const {width, height} = size;
    let x1, x2, x3, y1, y2, y3;
    if (yAlign === 'center') {
      y2 = ptY + (height / 2);
      if (xAlign === 'left') {
        x1 = ptX;
        x2 = x1 - caretSize;
        y1 = y2 + caretSize;
        y3 = y2 - caretSize;
      } else {
        x1 = ptX + width;
        x2 = x1 + caretSize;
        y1 = y2 - caretSize;
        y3 = y2 + caretSize;
      }
      x3 = x1;
    } else {
      if (xAlign === 'left') {
        x2 = ptX + cornerRadius + (caretSize);
      } else if (xAlign === 'right') {
        x2 = ptX + width - cornerRadius - caretSize;
      } else {
        x2 = this.caretX;
      }
      if (yAlign === 'top') {
        y1 = ptY;
        y2 = y1 - caretSize;
        x1 = x2 - caretSize;
        x3 = x2 + caretSize;
      } else {
        y1 = ptY + height;
        y2 = y1 + caretSize;
        x1 = x2 + caretSize;
        x3 = x2 - caretSize;
      }
      y3 = y1;
    }
    return {x1, x2, x3, y1, y2, y3};
  }
  drawTitle(pt, ctx, options) {
    const me = this;
    const title = me.title;
    const length = title.length;
    let titleFont, titleSpacing, i;
    if (length) {
      const rtlHelper = getRtlAdapter(options.rtl, me.x, me.width);
      pt.x = getAlignedX(me, options.titleAlign, options);
      ctx.textAlign = rtlHelper.textAlign(options.titleAlign);
      ctx.textBaseline = 'middle';
      titleFont = toFont(options.titleFont);
      titleSpacing = options.titleSpacing;
      ctx.fillStyle = options.titleColor;
      ctx.font = titleFont.string;
      for (i = 0; i < length; ++i) {
        ctx.fillText(title[i], rtlHelper.x(pt.x), pt.y + titleFont.lineHeight / 2);
        pt.y += titleFont.lineHeight + titleSpacing;
        if (i + 1 === length) {
          pt.y += options.titleMarginBottom - titleSpacing;
        }
      }
    }
  }
  _drawColorBox(ctx, pt, i, rtlHelper, options) {
    const me = this;
    const labelColors = me.labelColors[i];
    const labelPointStyle = me.labelPointStyles[i];
    const {boxHeight, boxWidth} = options;
    const bodyFont = toFont(options.bodyFont);
    const colorX = getAlignedX(me, 'left', options);
    const rtlColorX = rtlHelper.x(colorX);
    const yOffSet = boxHeight < bodyFont.lineHeight ? (bodyFont.lineHeight - boxHeight) / 2 : 0;
    const colorY = pt.y + yOffSet;
    if (options.usePointStyle) {
      const drawOptions = {
        radius: Math.min(boxWidth, boxHeight) / 2,
        pointStyle: labelPointStyle.pointStyle,
        rotation: labelPointStyle.rotation,
        borderWidth: 1
      };
      const centerX = rtlHelper.leftForLtr(rtlColorX, boxWidth) + boxWidth / 2;
      const centerY = colorY + boxHeight / 2;
      ctx.strokeStyle = options.multiKeyBackground;
      ctx.fillStyle = options.multiKeyBackground;
      drawPoint(ctx, drawOptions, centerX, centerY);
      ctx.strokeStyle = labelColors.borderColor;
      ctx.fillStyle = labelColors.backgroundColor;
      drawPoint(ctx, drawOptions, centerX, centerY);
    } else {
      ctx.lineWidth = labelColors.borderWidth || 1;
      ctx.strokeStyle = labelColors.borderColor;
      ctx.setLineDash(labelColors.borderDash || []);
      ctx.lineDashOffset = labelColors.borderDashOffset || 0;
      const outerX = rtlHelper.leftForLtr(rtlColorX, boxWidth);
      const innerX = rtlHelper.leftForLtr(rtlHelper.xPlus(rtlColorX, 1), boxWidth - 2);
      const borderRadius = toTRBLCorners(labelColors.borderRadius);
      if (Object.values(borderRadius).some(v => v !== 0)) {
        ctx.beginPath();
        ctx.fillStyle = options.multiKeyBackground;
        addRoundedRectPath(ctx, {
          x: outerX,
          y: colorY,
          w: boxWidth,
          h: boxHeight,
          radius: borderRadius,
        });
        ctx.fill();
        ctx.stroke();
        ctx.fillStyle = labelColors.backgroundColor;
        ctx.beginPath();
        addRoundedRectPath(ctx, {
          x: innerX,
          y: colorY + 1,
          w: boxWidth - 2,
          h: boxHeight - 2,
          radius: borderRadius,
        });
        ctx.fill();
      } else {
        ctx.fillStyle = options.multiKeyBackground;
        ctx.fillRect(outerX, colorY, boxWidth, boxHeight);
        ctx.strokeRect(outerX, colorY, boxWidth, boxHeight);
        ctx.fillStyle = labelColors.backgroundColor;
        ctx.fillRect(innerX, colorY + 1, boxWidth - 2, boxHeight - 2);
      }
    }
    ctx.fillStyle = me.labelTextColors[i];
  }
  drawBody(pt, ctx, options) {
    const me = this;
    const {body} = me;
    const {bodySpacing, bodyAlign, displayColors, boxHeight, boxWidth} = options;
    const bodyFont = toFont(options.bodyFont);
    let bodyLineHeight = bodyFont.lineHeight;
    let xLinePadding = 0;
    const rtlHelper = getRtlAdapter(options.rtl, me.x, me.width);
    const fillLineOfText = function(line) {
      ctx.fillText(line, rtlHelper.x(pt.x + xLinePadding), pt.y + bodyLineHeight / 2);
      pt.y += bodyLineHeight + bodySpacing;
    };
    const bodyAlignForCalculation = rtlHelper.textAlign(bodyAlign);
    let bodyItem, textColor, lines, i, j, ilen, jlen;
    ctx.textAlign = bodyAlign;
    ctx.textBaseline = 'middle';
    ctx.font = bodyFont.string;
    pt.x = getAlignedX(me, bodyAlignForCalculation, options);
    ctx.fillStyle = options.bodyColor;
    each(me.beforeBody, fillLineOfText);
    xLinePadding = displayColors && bodyAlignForCalculation !== 'right'
      ? bodyAlign === 'center' ? (boxWidth / 2 + 1) : (boxWidth + 2)
      : 0;
    for (i = 0, ilen = body.length; i < ilen; ++i) {
      bodyItem = body[i];
      textColor = me.labelTextColors[i];
      ctx.fillStyle = textColor;
      each(bodyItem.before, fillLineOfText);
      lines = bodyItem.lines;
      if (displayColors && lines.length) {
        me._drawColorBox(ctx, pt, i, rtlHelper, options);
        bodyLineHeight = Math.max(bodyFont.lineHeight, boxHeight);
      }
      for (j = 0, jlen = lines.length; j < jlen; ++j) {
        fillLineOfText(lines[j]);
        bodyLineHeight = bodyFont.lineHeight;
      }
      each(bodyItem.after, fillLineOfText);
    }
    xLinePadding = 0;
    bodyLineHeight = bodyFont.lineHeight;
    each(me.afterBody, fillLineOfText);
    pt.y -= bodySpacing;
  }
  drawFooter(pt, ctx, options) {
    const me = this;
    const footer = me.footer;
    const length = footer.length;
    let footerFont, i;
    if (length) {
      const rtlHelper = getRtlAdapter(options.rtl, me.x, me.width);
      pt.x = getAlignedX(me, options.footerAlign, options);
      pt.y += options.footerMarginTop;
      ctx.textAlign = rtlHelper.textAlign(options.footerAlign);
      ctx.textBaseline = 'middle';
      footerFont = toFont(options.footerFont);
      ctx.fillStyle = options.footerColor;
      ctx.font = footerFont.string;
      for (i = 0; i < length; ++i) {
        ctx.fillText(footer[i], rtlHelper.x(pt.x), pt.y + footerFont.lineHeight / 2);
        pt.y += footerFont.lineHeight + options.footerSpacing;
      }
    }
  }
  drawBackground(pt, ctx, tooltipSize, options) {
    const {xAlign, yAlign} = this;
    const {x, y} = pt;
    const {width, height} = tooltipSize;
    const radius = options.cornerRadius;
    ctx.fillStyle = options.backgroundColor;
    ctx.strokeStyle = options.borderColor;
    ctx.lineWidth = options.borderWidth;
    ctx.beginPath();
    ctx.moveTo(x + radius, y);
    if (yAlign === 'top') {
      this.drawCaret(pt, ctx, tooltipSize, options);
    }
    ctx.lineTo(x + width - radius, y);
    ctx.quadraticCurveTo(x + width, y, x + width, y + radius);
    if (yAlign === 'center' && xAlign === 'right') {
      this.drawCaret(pt, ctx, tooltipSize, options);
    }
    ctx.lineTo(x + width, y + height - radius);
    ctx.quadraticCurveTo(x + width, y + height, x + width - radius, y + height);
    if (yAlign === 'bottom') {
      this.drawCaret(pt, ctx, tooltipSize, options);
    }
    ctx.lineTo(x + radius, y + height);
    ctx.quadraticCurveTo(x, y + height, x, y + height - radius);
    if (yAlign === 'center' && xAlign === 'left') {
      this.drawCaret(pt, ctx, tooltipSize, options);
    }
    ctx.lineTo(x, y + radius);
    ctx.quadraticCurveTo(x, y, x + radius, y);
    ctx.closePath();
    ctx.fill();
    if (options.borderWidth > 0) {
      ctx.stroke();
    }
  }
  _updateAnimationTarget(options) {
    const me = this;
    const chart = me._chart;
    const anims = me.$animations;
    const animX = anims && anims.x;
    const animY = anims && anims.y;
    if (animX || animY) {
      const position = positioners[options.position].call(me, me._active, me._eventPosition);
      if (!position) {
        return;
      }
      const size = me._size = getTooltipSize(me, options);
      const positionAndSize = Object.assign({}, position, me._size);
      const alignment = determineAlignment(chart, options, positionAndSize);
      const point = getBackgroundPoint(options, positionAndSize, alignment, chart);
      if (animX._to !== point.x || animY._to !== point.y) {
        me.xAlign = alignment.xAlign;
        me.yAlign = alignment.yAlign;
        me.width = size.width;
        me.height = size.height;
        me.caretX = position.x;
        me.caretY = position.y;
        me._resolveAnimations().update(me, point);
      }
    }
  }
  draw(ctx) {
    const me = this;
    const options = me.options.setContext(me.getContext());
    let opacity = me.opacity;
    if (!opacity) {
      return;
    }
    me._updateAnimationTarget(options);
    const tooltipSize = {
      width: me.width,
      height: me.height
    };
    const pt = {
      x: me.x,
      y: me.y
    };
    opacity = Math.abs(opacity) < 1e-3 ? 0 : opacity;
    const padding = toPadding(options.padding);
    const hasTooltipContent = me.title.length || me.beforeBody.length || me.body.length || me.afterBody.length || me.footer.length;
    if (options.enabled && hasTooltipContent) {
      ctx.save();
      ctx.globalAlpha = opacity;
      me.drawBackground(pt, ctx, tooltipSize, options);
      overrideTextDirection(ctx, options.textDirection);
      pt.y += padding.top;
      me.drawTitle(pt, ctx, options);
      me.drawBody(pt, ctx, options);
      me.drawFooter(pt, ctx, options);
      restoreTextDirection(ctx, options.textDirection);
      ctx.restore();
    }
  }
  getActiveElements() {
    return this._active || [];
  }
  setActiveElements(activeElements, eventPosition) {
    const me = this;
    const lastActive = me._active;
    const active = activeElements.map(({datasetIndex, index}) => {
      const meta = me._chart.getDatasetMeta(datasetIndex);
      if (!meta) {
        throw new Error('Cannot find a dataset at index ' + datasetIndex);
      }
      return {
        datasetIndex,
        element: meta.data[index],
        index,
      };
    });
    const changed = !_elementsEqual(lastActive, active);
    const positionChanged = me._positionChanged(active, eventPosition);
    if (changed || positionChanged) {
      me._active = active;
      me._eventPosition = eventPosition;
      me.update(true);
    }
  }
  handleEvent(e, replay) {
    const me = this;
    const options = me.options;
    const lastActive = me._active || [];
    let changed = false;
    let active = [];
    if (e.type !== 'mouseout') {
      active = me._chart.getElementsAtEventForMode(e, options.mode, options, replay);
      if (options.reverse) {
        active.reverse();
      }
    }
    const positionChanged = me._positionChanged(active, e);
    changed = replay || !_elementsEqual(active, lastActive) || positionChanged;
    if (changed) {
      me._active = active;
      if (options.enabled || options.external) {
        me._eventPosition = {
          x: e.x,
          y: e.y
        };
        me.update(true, replay);
      }
    }
    return changed;
  }
  _positionChanged(active, e) {
    const {caretX, caretY, options} = this;
    const position = positioners[options.position].call(this, active, e);
    return position !== false && (caretX !== position.x || caretY !== position.y);
  }
}
Tooltip.positioners = positioners;
var plugin_tooltip = {
  id: 'tooltip',
  _element: Tooltip,
  positioners,
  afterInit(chart, _args, options) {
    if (options) {
      chart.tooltip = new Tooltip({_chart: chart, options});
    }
  },
  beforeUpdate(chart, _args, options) {
    if (chart.tooltip) {
      chart.tooltip.initialize(options);
    }
  },
  reset(chart, _args, options) {
    if (chart.tooltip) {
      chart.tooltip.initialize(options);
    }
  },
  afterDraw(chart) {
    const tooltip = chart.tooltip;
    const args = {
      tooltip
    };
    if (chart.notifyPlugins('beforeTooltipDraw', args) === false) {
      return;
    }
    if (tooltip) {
      tooltip.draw(chart.ctx);
    }
    chart.notifyPlugins('afterTooltipDraw', args);
  },
  afterEvent(chart, args) {
    if (chart.tooltip) {
      const useFinalPosition = args.replay;
      if (chart.tooltip.handleEvent(args.event, useFinalPosition)) {
        args.changed = true;
      }
    }
  },
  defaults: {
    enabled: true,
    external: null,
    position: 'average',
    backgroundColor: 'rgba(0,0,0,0.8)',
    titleColor: '#fff',
    titleFont: {
      weight: 'bold',
    },
    titleSpacing: 2,
    titleMarginBottom: 6,
    titleAlign: 'left',
    bodyColor: '#fff',
    bodySpacing: 2,
    bodyFont: {
    },
    bodyAlign: 'left',
    footerColor: '#fff',
    footerSpacing: 2,
    footerMarginTop: 6,
    footerFont: {
      weight: 'bold',
    },
    footerAlign: 'left',
    padding: 6,
    caretPadding: 2,
    caretSize: 5,
    cornerRadius: 6,
    boxHeight: (ctx, opts) => opts.bodyFont.size,
    boxWidth: (ctx, opts) => opts.bodyFont.size,
    multiKeyBackground: '#fff',
    displayColors: true,
    borderColor: 'rgba(0,0,0,0)',
    borderWidth: 0,
    animation: {
      duration: 400,
      easing: 'easeOutQuart',
    },
    animations: {
      numbers: {
        type: 'number',
        properties: ['x', 'y', 'width', 'height', 'caretX', 'caretY'],
      },
      opacity: {
        easing: 'linear',
        duration: 200
      }
    },
    callbacks: {
      beforeTitle: noop,
      title(tooltipItems) {
        if (tooltipItems.length > 0) {
          const item = tooltipItems[0];
          const labels = item.chart.data.labels;
          const labelCount = labels ? labels.length : 0;
          if (this && this.options && this.options.mode === 'dataset') {
            return item.dataset.label || '';
          } else if (item.label) {
            return item.label;
          } else if (labelCount > 0 && item.dataIndex < labelCount) {
            return labels[item.dataIndex];
          }
        }
        return '';
      },
      afterTitle: noop,
      beforeBody: noop,
      beforeLabel: noop,
      label(tooltipItem) {
        if (this && this.options && this.options.mode === 'dataset') {
          return tooltipItem.label + ': ' + tooltipItem.formattedValue || tooltipItem.formattedValue;
        }
        let label = tooltipItem.dataset.label || '';
        if (label) {
          label += ': ';
        }
        const value = tooltipItem.formattedValue;
        if (!isNullOrUndef(value)) {
          label += value;
        }
        return label;
      },
      labelColor(tooltipItem) {
        const meta = tooltipItem.chart.getDatasetMeta(tooltipItem.datasetIndex);
        const options = meta.controller.getStyle(tooltipItem.dataIndex);
        return {
          borderColor: options.borderColor,
          backgroundColor: options.backgroundColor,
          borderWidth: options.borderWidth,
          borderDash: options.borderDash,
          borderDashOffset: options.borderDashOffset,
          borderRadius: 0,
        };
      },
      labelTextColor() {
        return this.options.bodyColor;
      },
      labelPointStyle(tooltipItem) {
        const meta = tooltipItem.chart.getDatasetMeta(tooltipItem.datasetIndex);
        const options = meta.controller.getStyle(tooltipItem.dataIndex);
        return {
          pointStyle: options.pointStyle,
          rotation: options.rotation,
        };
      },
      afterLabel: noop,
      afterBody: noop,
      beforeFooter: noop,
      footer: noop,
      afterFooter: noop
    }
  },
  defaultRoutes: {
    bodyFont: 'font',
    footerFont: 'font',
    titleFont: 'font'
  },
  descriptors: {
    _scriptable: (name) => name !== 'filter' && name !== 'itemSort' && name !== 'external',
    _indexable: false,
    callbacks: {
      _scriptable: false,
      _indexable: false,
    },
    animation: {
      _fallback: false
    },
    animations: {
      _fallback: 'animation'
    }
  },
  additionalOptionScopes: ['interaction']
};

var plugins = /*#__PURE__*/Object.freeze({
__proto__: null,
Decimation: plugin_decimation,
Filler: plugin_filler,
Legend: plugin_legend,
SubTitle: plugin_subtitle,
Title: plugin_title,
Tooltip: plugin_tooltip
});

const addIfString = (labels, raw, index) => typeof raw === 'string'
  ? labels.push(raw) - 1
  : isNaN(raw) ? null : index;
function findOrAddLabel(labels, raw, index) {
  const first = labels.indexOf(raw);
  if (first === -1) {
    return addIfString(labels, raw, index);
  }
  const last = labels.lastIndexOf(raw);
  return first !== last ? index : first;
}
const validIndex = (index, max) => index === null ? null : _limitValue(Math.round(index), 0, max);
class CategoryScale extends Scale {
  constructor(cfg) {
    super(cfg);
    this._startValue = undefined;
    this._valueRange = 0;
  }
  parse(raw, index) {
    if (isNullOrUndef(raw)) {
      return null;
    }
    const labels = this.getLabels();
    index = isFinite(index) && labels[index] === raw ? index
      : findOrAddLabel(labels, raw, valueOrDefault(index, raw));
    return validIndex(index, labels.length - 1);
  }
  determineDataLimits() {
    const me = this;
    const {minDefined, maxDefined} = me.getUserBounds();
    let {min, max} = me.getMinMax(true);
    if (me.options.bounds === 'ticks') {
      if (!minDefined) {
        min = 0;
      }
      if (!maxDefined) {
        max = me.getLabels().length - 1;
      }
    }
    me.min = min;
    me.max = max;
  }
  buildTicks() {
    const me = this;
    const min = me.min;
    const max = me.max;
    const offset = me.options.offset;
    const ticks = [];
    let labels = me.getLabels();
    labels = (min === 0 && max === labels.length - 1) ? labels : labels.slice(min, max + 1);
    me._valueRange = Math.max(labels.length - (offset ? 0 : 1), 1);
    me._startValue = me.min - (offset ? 0.5 : 0);
    for (let value = min; value <= max; value++) {
      ticks.push({value});
    }
    return ticks;
  }
  getLabelForValue(value) {
    const me = this;
    const labels = me.getLabels();
    if (value >= 0 && value < labels.length) {
      return labels[value];
    }
    return value;
  }
  configure() {
    const me = this;
    super.configure();
    if (!me.isHorizontal()) {
      me._reversePixels = !me._reversePixels;
    }
  }
  getPixelForValue(value) {
    const me = this;
    if (typeof value !== 'number') {
      value = me.parse(value);
    }
    return value === null ? NaN : me.getPixelForDecimal((value - me._startValue) / me._valueRange);
  }
  getPixelForTick(index) {
    const me = this;
    const ticks = me.ticks;
    if (index < 0 || index > ticks.length - 1) {
      return null;
    }
    return me.getPixelForValue(ticks[index].value);
  }
  getValueForPixel(pixel) {
    const me = this;
    return Math.round(me._startValue + me.getDecimalForPixel(pixel) * me._valueRange);
  }
  getBasePixel() {
    return this.bottom;
  }
}
CategoryScale.id = 'category';
CategoryScale.defaults = {
  ticks: {
    callback: CategoryScale.prototype.getLabelForValue
  }
};

function generateTicks$1(generationOptions, dataRange) {
  const ticks = [];
  const MIN_SPACING = 1e-14;
  const {bounds, step, min, max, precision, count, maxTicks, maxDigits, includeBounds} = generationOptions;
  const unit = step || 1;
  const maxSpaces = maxTicks - 1;
  const {min: rmin, max: rmax} = dataRange;
  const minDefined = !isNullOrUndef(min);
  const maxDefined = !isNullOrUndef(max);
  const countDefined = !isNullOrUndef(count);
  const minSpacing = (rmax - rmin) / (maxDigits + 1);
  let spacing = niceNum((rmax - rmin) / maxSpaces / unit) * unit;
  let factor, niceMin, niceMax, numSpaces;
  if (spacing < MIN_SPACING && !minDefined && !maxDefined) {
    return [{value: rmin}, {value: rmax}];
  }
  numSpaces = Math.ceil(rmax / spacing) - Math.floor(rmin / spacing);
  if (numSpaces > maxSpaces) {
    spacing = niceNum(numSpaces * spacing / maxSpaces / unit) * unit;
  }
  if (!isNullOrUndef(precision)) {
    factor = Math.pow(10, precision);
    spacing = Math.ceil(spacing * factor) / factor;
  }
  if (bounds === 'ticks') {
    niceMin = Math.floor(rmin / spacing) * spacing;
    niceMax = Math.ceil(rmax / spacing) * spacing;
  } else {
    niceMin = rmin;
    niceMax = rmax;
  }
  if (minDefined && maxDefined && step && almostWhole((max - min) / step, spacing / 1000)) {
    numSpaces = Math.round(Math.min((max - min) / spacing, maxTicks));
    spacing = (max - min) / numSpaces;
    niceMin = min;
    niceMax = max;
  } else if (countDefined) {
    niceMin = minDefined ? min : niceMin;
    niceMax = maxDefined ? max : niceMax;
    numSpaces = count - 1;
    spacing = (niceMax - niceMin) / numSpaces;
  } else {
    numSpaces = (niceMax - niceMin) / spacing;
    if (almostEquals(numSpaces, Math.round(numSpaces), spacing / 1000)) {
      numSpaces = Math.round(numSpaces);
    } else {
      numSpaces = Math.ceil(numSpaces);
    }
  }
  const decimalPlaces = Math.max(
    _decimalPlaces(spacing),
    _decimalPlaces(niceMin)
  );
  factor = Math.pow(10, isNullOrUndef(precision) ? decimalPlaces : precision);
  niceMin = Math.round(niceMin * factor) / factor;
  niceMax = Math.round(niceMax * factor) / factor;
  let j = 0;
  if (minDefined) {
    if (includeBounds && niceMin !== min) {
      ticks.push({value: min});
      if (niceMin < min) {
        j++;
      }
      if (almostEquals(Math.round((niceMin + j * spacing) * factor) / factor, min, relativeLabelSize(min, minSpacing, generationOptions))) {
        j++;
      }
    } else if (niceMin < min) {
      j++;
    }
  }
  for (; j < numSpaces; ++j) {
    ticks.push({value: Math.round((niceMin + j * spacing) * factor) / factor});
  }
  if (maxDefined && includeBounds && niceMax !== max) {
    if (almostEquals(ticks[ticks.length - 1].value, max, relativeLabelSize(max, minSpacing, generationOptions))) {
      ticks[ticks.length - 1].value = max;
    } else {
      ticks.push({value: max});
    }
  } else if (!maxDefined || niceMax === max) {
    ticks.push({value: niceMax});
  }
  return ticks;
}
function relativeLabelSize(value, minSpacing, {horizontal, minRotation}) {
  const rad = toRadians(minRotation);
  const ratio = (horizontal ? Math.sin(rad) : Math.cos(rad)) || 0.001;
  const length = 0.75 * minSpacing * ('' + value).length;
  return Math.min(minSpacing / ratio, length);
}
class LinearScaleBase extends Scale {
  constructor(cfg) {
    super(cfg);
    this.start = undefined;
    this.end = undefined;
    this._startValue = undefined;
    this._endValue = undefined;
    this._valueRange = 0;
  }
  parse(raw, index) {
    if (isNullOrUndef(raw)) {
      return null;
    }
    if ((typeof raw === 'number' || raw instanceof Number) && !isFinite(+raw)) {
      return null;
    }
    return +raw;
  }
  handleTickRangeOptions() {
    const me = this;
    const {beginAtZero} = me.options;
    const {minDefined, maxDefined} = me.getUserBounds();
    let {min, max} = me;
    const setMin = v => (min = minDefined ? min : v);
    const setMax = v => (max = maxDefined ? max : v);
    if (beginAtZero) {
      const minSign = sign(min);
      const maxSign = sign(max);
      if (minSign < 0 && maxSign < 0) {
        setMax(0);
      } else if (minSign > 0 && maxSign > 0) {
        setMin(0);
      }
    }
    if (min === max) {
      let offset = 1;
      if (max >= Number.MAX_SAFE_INTEGER || min <= Number.MIN_SAFE_INTEGER) {
        offset = Math.abs(max * 0.05);
      }
      setMax(max + offset);
      if (!beginAtZero) {
        setMin(min - offset);
      }
    }
    me.min = min;
    me.max = max;
  }
  getTickLimit() {
    const me = this;
    const tickOpts = me.options.ticks;
    let {maxTicksLimit, stepSize} = tickOpts;
    let maxTicks;
    if (stepSize) {
      maxTicks = Math.ceil(me.max / stepSize) - Math.floor(me.min / stepSize) + 1;
    } else {
      maxTicks = me.computeTickLimit();
      maxTicksLimit = maxTicksLimit || 11;
    }
    if (maxTicksLimit) {
      maxTicks = Math.min(maxTicksLimit, maxTicks);
    }
    return maxTicks;
  }
  computeTickLimit() {
    return Number.POSITIVE_INFINITY;
  }
  buildTicks() {
    const me = this;
    const opts = me.options;
    const tickOpts = opts.ticks;
    let maxTicks = me.getTickLimit();
    maxTicks = Math.max(2, maxTicks);
    const numericGeneratorOptions = {
      maxTicks,
      bounds: opts.bounds,
      min: opts.min,
      max: opts.max,
      precision: tickOpts.precision,
      step: tickOpts.stepSize,
      count: tickOpts.count,
      maxDigits: me._maxDigits(),
      horizontal: me.isHorizontal(),
      minRotation: tickOpts.minRotation || 0,
      includeBounds: tickOpts.includeBounds !== false
    };
    const dataRange = me._range || me;
    const ticks = generateTicks$1(numericGeneratorOptions, dataRange);
    if (opts.bounds === 'ticks') {
      _setMinAndMaxByKey(ticks, me, 'value');
    }
    if (opts.reverse) {
      ticks.reverse();
      me.start = me.max;
      me.end = me.min;
    } else {
      me.start = me.min;
      me.end = me.max;
    }
    return ticks;
  }
  configure() {
    const me = this;
    const ticks = me.ticks;
    let start = me.min;
    let end = me.max;
    super.configure();
    if (me.options.offset && ticks.length) {
      const offset = (end - start) / Math.max(ticks.length - 1, 1) / 2;
      start -= offset;
      end += offset;
    }
    me._startValue = start;
    me._endValue = end;
    me._valueRange = end - start;
  }
  getLabelForValue(value) {
    return formatNumber(value, this.chart.options.locale);
  }
}

class LinearScale extends LinearScaleBase {
  determineDataLimits() {
    const me = this;
    const {min, max} = me.getMinMax(true);
    me.min = isNumberFinite(min) ? min : 0;
    me.max = isNumberFinite(max) ? max : 1;
    me.handleTickRangeOptions();
  }
  computeTickLimit() {
    const me = this;
    const horizontal = me.isHorizontal();
    const length = horizontal ? me.width : me.height;
    const minRotation = toRadians(me.options.ticks.minRotation);
    const ratio = (horizontal ? Math.sin(minRotation) : Math.cos(minRotation)) || 0.001;
    const tickFont = me._resolveTickFontOptions(0);
    return Math.ceil(length / Math.min(40, tickFont.lineHeight / ratio));
  }
  getPixelForValue(value) {
    return value === null ? NaN : this.getPixelForDecimal((value - this._startValue) / this._valueRange);
  }
  getValueForPixel(pixel) {
    return this._startValue + this.getDecimalForPixel(pixel) * this._valueRange;
  }
}
LinearScale.id = 'linear';
LinearScale.defaults = {
  ticks: {
    callback: Ticks.formatters.numeric
  }
};

function isMajor(tickVal) {
  const remain = tickVal / (Math.pow(10, Math.floor(log10(tickVal))));
  return remain === 1;
}
function generateTicks(generationOptions, dataRange) {
  const endExp = Math.floor(log10(dataRange.max));
  const endSignificand = Math.ceil(dataRange.max / Math.pow(10, endExp));
  const ticks = [];
  let tickVal = finiteOrDefault(generationOptions.min, Math.pow(10, Math.floor(log10(dataRange.min))));
  let exp = Math.floor(log10(tickVal));
  let significand = Math.floor(tickVal / Math.pow(10, exp));
  let precision = exp < 0 ? Math.pow(10, Math.abs(exp)) : 1;
  do {
    ticks.push({value: tickVal, major: isMajor(tickVal)});
    ++significand;
    if (significand === 10) {
      significand = 1;
      ++exp;
      precision = exp >= 0 ? 1 : precision;
    }
    tickVal = Math.round(significand * Math.pow(10, exp) * precision) / precision;
  } while (exp < endExp || (exp === endExp && significand < endSignificand));
  const lastTick = finiteOrDefault(generationOptions.max, tickVal);
  ticks.push({value: lastTick, major: isMajor(tickVal)});
  return ticks;
}
class LogarithmicScale extends Scale {
  constructor(cfg) {
    super(cfg);
    this.start = undefined;
    this.end = undefined;
    this._startValue = undefined;
    this._valueRange = 0;
  }
  parse(raw, index) {
    const value = LinearScaleBase.prototype.parse.apply(this, [raw, index]);
    if (value === 0) {
      this._zero = true;
      return undefined;
    }
    return isNumberFinite(value) && value > 0 ? value : null;
  }
  determineDataLimits() {
    const me = this;
    const {min, max} = me.getMinMax(true);
    me.min = isNumberFinite(min) ? Math.max(0, min) : null;
    me.max = isNumberFinite(max) ? Math.max(0, max) : null;
    if (me.options.beginAtZero) {
      me._zero = true;
    }
    me.handleTickRangeOptions();
  }
  handleTickRangeOptions() {
    const me = this;
    const {minDefined, maxDefined} = me.getUserBounds();
    let min = me.min;
    let max = me.max;
    const setMin = v => (min = minDefined ? min : v);
    const setMax = v => (max = maxDefined ? max : v);
    const exp = (v, m) => Math.pow(10, Math.floor(log10(v)) + m);
    if (min === max) {
      if (min <= 0) {
        setMin(1);
        setMax(10);
      } else {
        setMin(exp(min, -1));
        setMax(exp(max, +1));
      }
    }
    if (min <= 0) {
      setMin(exp(max, -1));
    }
    if (max <= 0) {
      setMax(exp(min, +1));
    }
    if (me._zero && me.min !== me._suggestedMin && min === exp(me.min, 0)) {
      setMin(exp(min, -1));
    }
    me.min = min;
    me.max = max;
  }
  buildTicks() {
    const me = this;
    const opts = me.options;
    const generationOptions = {
      min: me._userMin,
      max: me._userMax
    };
    const ticks = generateTicks(generationOptions, me);
    if (opts.bounds === 'ticks') {
      _setMinAndMaxByKey(ticks, me, 'value');
    }
    if (opts.reverse) {
      ticks.reverse();
      me.start = me.max;
      me.end = me.min;
    } else {
      me.start = me.min;
      me.end = me.max;
    }
    return ticks;
  }
  getLabelForValue(value) {
    return value === undefined ? '0' : formatNumber(value, this.chart.options.locale);
  }
  configure() {
    const me = this;
    const start = me.min;
    super.configure();
    me._startValue = log10(start);
    me._valueRange = log10(me.max) - log10(start);
  }
  getPixelForValue(value) {
    const me = this;
    if (value === undefined || value === 0) {
      value = me.min;
    }
    if (value === null || isNaN(value)) {
      return NaN;
    }
    return me.getPixelForDecimal(value === me.min
      ? 0
      : (log10(value) - me._startValue) / me._valueRange);
  }
  getValueForPixel(pixel) {
    const me = this;
    const decimal = me.getDecimalForPixel(pixel);
    return Math.pow(10, me._startValue + decimal * me._valueRange);
  }
}
LogarithmicScale.id = 'logarithmic';
LogarithmicScale.defaults = {
  ticks: {
    callback: Ticks.formatters.logarithmic,
    major: {
      enabled: true
    }
  }
};

function getTickBackdropHeight(opts) {
  const tickOpts = opts.ticks;
  if (tickOpts.display && opts.display) {
    const padding = toPadding(tickOpts.backdropPadding);
    return valueOrDefault(tickOpts.font && tickOpts.font.size, defaults.font.size) + padding.height;
  }
  return 0;
}
function measureLabelSize(ctx, font, label) {
  label = isArray(label) ? label : [label];
  return {
    w: _longestText(ctx, font.string, label),
    h: label.length * font.lineHeight
  };
}
function determineLimits(angle, pos, size, min, max) {
  if (angle === min || angle === max) {
    return {
      start: pos - (size / 2),
      end: pos + (size / 2)
    };
  } else if (angle < min || angle > max) {
    return {
      start: pos - size,
      end: pos
    };
  }
  return {
    start: pos,
    end: pos + size
  };
}
function fitWithPointLabels(scale) {
  const furthestLimits = {
    l: 0,
    r: scale.width,
    t: 0,
    b: scale.height - scale.paddingTop
  };
  const furthestAngles = {};
  const labelSizes = [];
  const padding = [];
  const valueCount = scale.getLabels().length;
  for (let i = 0; i < valueCount; i++) {
    const opts = scale.options.pointLabels.setContext(scale.getPointLabelContext(i));
    padding[i] = opts.padding;
    const pointPosition = scale.getPointPosition(i, scale.drawingArea + padding[i]);
    const plFont = toFont(opts.font);
    const textSize = measureLabelSize(scale.ctx, plFont, scale._pointLabels[i]);
    labelSizes[i] = textSize;
    const angleRadians = scale.getIndexAngle(i);
    const angle = toDegrees(angleRadians);
    const hLimits = determineLimits(angle, pointPosition.x, textSize.w, 0, 180);
    const vLimits = determineLimits(angle, pointPosition.y, textSize.h, 90, 270);
    if (hLimits.start < furthestLimits.l) {
      furthestLimits.l = hLimits.start;
      furthestAngles.l = angleRadians;
    }
    if (hLimits.end > furthestLimits.r) {
      furthestLimits.r = hLimits.end;
      furthestAngles.r = angleRadians;
    }
    if (vLimits.start < furthestLimits.t) {
      furthestLimits.t = vLimits.start;
      furthestAngles.t = angleRadians;
    }
    if (vLimits.end > furthestLimits.b) {
      furthestLimits.b = vLimits.end;
      furthestAngles.b = angleRadians;
    }
  }
  scale._setReductions(scale.drawingArea, furthestLimits, furthestAngles);
  scale._pointLabelItems = buildPointLabelItems(scale, labelSizes, padding);
}
function buildPointLabelItems(scale, labelSizes, padding) {
  const items = [];
  const valueCount = scale.getLabels().length;
  const opts = scale.options;
  const tickBackdropHeight = getTickBackdropHeight(opts);
  const outerDistance = scale.getDistanceFromCenterForValue(opts.ticks.reverse ? scale.min : scale.max);
  for (let i = 0; i < valueCount; i++) {
    const extra = (i === 0 ? tickBackdropHeight / 2 : 0);
    const pointLabelPosition = scale.getPointPosition(i, outerDistance + extra + padding[i]);
    const angle = toDegrees(scale.getIndexAngle(i));
    const size = labelSizes[i];
    const y = yForAngle(pointLabelPosition.y, size.h, angle);
    const textAlign = getTextAlignForAngle(angle);
    const left = leftForTextAlign(pointLabelPosition.x, size.w, textAlign);
    items.push({
      x: pointLabelPosition.x,
      y,
      textAlign,
      left,
      top: y,
      right: left + size.w,
      bottom: y + size.h
    });
  }
  return items;
}
function getTextAlignForAngle(angle) {
  if (angle === 0 || angle === 180) {
    return 'center';
  } else if (angle < 180) {
    return 'left';
  }
  return 'right';
}
function leftForTextAlign(x, w, align) {
  if (align === 'right') {
    x -= w;
  } else if (align === 'center') {
    x -= (w / 2);
  }
  return x;
}
function yForAngle(y, h, angle) {
  if (angle === 90 || angle === 270) {
    y -= (h / 2);
  } else if (angle > 270 || angle < 90) {
    y -= h;
  }
  return y;
}
function drawPointLabels(scale, labelCount) {
  const {ctx, options: {pointLabels}} = scale;
  for (let i = labelCount - 1; i >= 0; i--) {
    const optsAtIndex = pointLabels.setContext(scale.getPointLabelContext(i));
    const plFont = toFont(optsAtIndex.font);
    const {x, y, textAlign, left, top, right, bottom} = scale._pointLabelItems[i];
    const {backdropColor} = optsAtIndex;
    if (!isNullOrUndef(backdropColor)) {
      const padding = toPadding(optsAtIndex.backdropPadding);
      ctx.fillStyle = backdropColor;
      ctx.fillRect(left - padding.left, top - padding.top, right - left + padding.width, bottom - top + padding.height);
    }
    renderText(
      ctx,
      scale._pointLabels[i],
      x,
      y + (plFont.lineHeight / 2),
      plFont,
      {
        color: optsAtIndex.color,
        textAlign: textAlign,
        textBaseline: 'middle'
      }
    );
  }
}
function pathRadiusLine(scale, radius, circular, labelCount) {
  const {ctx} = scale;
  if (circular) {
    ctx.arc(scale.xCenter, scale.yCenter, radius, 0, TAU);
  } else {
    let pointPosition = scale.getPointPosition(0, radius);
    ctx.moveTo(pointPosition.x, pointPosition.y);
    for (let i = 1; i < labelCount; i++) {
      pointPosition = scale.getPointPosition(i, radius);
      ctx.lineTo(pointPosition.x, pointPosition.y);
    }
  }
}
function drawRadiusLine(scale, gridLineOpts, radius, labelCount) {
  const ctx = scale.ctx;
  const circular = gridLineOpts.circular;
  const {color, lineWidth} = gridLineOpts;
  if ((!circular && !labelCount) || !color || !lineWidth || radius < 0) {
    return;
  }
  ctx.save();
  ctx.strokeStyle = color;
  ctx.lineWidth = lineWidth;
  ctx.setLineDash(gridLineOpts.borderDash);
  ctx.lineDashOffset = gridLineOpts.borderDashOffset;
  ctx.beginPath();
  pathRadiusLine(scale, radius, circular, labelCount);
  ctx.closePath();
  ctx.stroke();
  ctx.restore();
}
function numberOrZero(param) {
  return isNumber(param) ? param : 0;
}
function createPointLabelContext(parent, index, label) {
  return Object.assign(Object.create(parent), {
    label,
    index,
    type: 'pointLabel'
  });
}
class RadialLinearScale extends LinearScaleBase {
  constructor(cfg) {
    super(cfg);
    this.xCenter = undefined;
    this.yCenter = undefined;
    this.drawingArea = undefined;
    this._pointLabels = [];
    this._pointLabelItems = [];
  }
  setDimensions() {
    const me = this;
    me.width = me.maxWidth;
    me.height = me.maxHeight;
    me.paddingTop = getTickBackdropHeight(me.options) / 2;
    me.xCenter = Math.floor(me.width / 2);
    me.yCenter = Math.floor((me.height - me.paddingTop) / 2);
    me.drawingArea = Math.min(me.height - me.paddingTop, me.width) / 2;
  }
  determineDataLimits() {
    const me = this;
    const {min, max} = me.getMinMax(false);
    me.min = isNumberFinite(min) && !isNaN(min) ? min : 0;
    me.max = isNumberFinite(max) && !isNaN(max) ? max : 0;
    me.handleTickRangeOptions();
  }
  computeTickLimit() {
    return Math.ceil(this.drawingArea / getTickBackdropHeight(this.options));
  }
  generateTickLabels(ticks) {
    const me = this;
    LinearScaleBase.prototype.generateTickLabels.call(me, ticks);
    me._pointLabels = me.getLabels().map((value, index) => {
      const label = callback(me.options.pointLabels.callback, [value, index], me);
      return label || label === 0 ? label : '';
    });
  }
  fit() {
    const me = this;
    const opts = me.options;
    if (opts.display && opts.pointLabels.display) {
      fitWithPointLabels(me);
    } else {
      me.setCenterPoint(0, 0, 0, 0);
    }
  }
  _setReductions(largestPossibleRadius, furthestLimits, furthestAngles) {
    const me = this;
    let radiusReductionLeft = furthestLimits.l / Math.sin(furthestAngles.l);
    let radiusReductionRight = Math.max(furthestLimits.r - me.width, 0) / Math.sin(furthestAngles.r);
    let radiusReductionTop = -furthestLimits.t / Math.cos(furthestAngles.t);
    let radiusReductionBottom = -Math.max(furthestLimits.b - (me.height - me.paddingTop), 0) / Math.cos(furthestAngles.b);
    radiusReductionLeft = numberOrZero(radiusReductionLeft);
    radiusReductionRight = numberOrZero(radiusReductionRight);
    radiusReductionTop = numberOrZero(radiusReductionTop);
    radiusReductionBottom = numberOrZero(radiusReductionBottom);
    me.drawingArea = Math.max(largestPossibleRadius / 2, Math.min(
      Math.floor(largestPossibleRadius - (radiusReductionLeft + radiusReductionRight) / 2),
      Math.floor(largestPossibleRadius - (radiusReductionTop + radiusReductionBottom) / 2)));
    me.setCenterPoint(radiusReductionLeft, radiusReductionRight, radiusReductionTop, radiusReductionBottom);
  }
  setCenterPoint(leftMovement, rightMovement, topMovement, bottomMovement) {
    const me = this;
    const maxRight = me.width - rightMovement - me.drawingArea;
    const maxLeft = leftMovement + me.drawingArea;
    const maxTop = topMovement + me.drawingArea;
    const maxBottom = (me.height - me.paddingTop) - bottomMovement - me.drawingArea;
    me.xCenter = Math.floor(((maxLeft + maxRight) / 2) + me.left);
    me.yCenter = Math.floor(((maxTop + maxBottom) / 2) + me.top + me.paddingTop);
  }
  getIndexAngle(index) {
    const angleMultiplier = TAU / this.getLabels().length;
    const startAngle = this.options.startAngle || 0;
    return _normalizeAngle(index * angleMultiplier + toRadians(startAngle));
  }
  getDistanceFromCenterForValue(value) {
    const me = this;
    if (isNullOrUndef(value)) {
      return NaN;
    }
    const scalingFactor = me.drawingArea / (me.max - me.min);
    if (me.options.reverse) {
      return (me.max - value) * scalingFactor;
    }
    return (value - me.min) * scalingFactor;
  }
  getValueForDistanceFromCenter(distance) {
    if (isNullOrUndef(distance)) {
      return NaN;
    }
    const me = this;
    const scaledDistance = distance / (me.drawingArea / (me.max - me.min));
    return me.options.reverse ? me.max - scaledDistance : me.min + scaledDistance;
  }
  getPointLabelContext(index) {
    const me = this;
    const pointLabels = me._pointLabels || [];
    if (index >= 0 && index < pointLabels.length) {
      const pointLabel = pointLabels[index];
      return createPointLabelContext(me.getContext(), index, pointLabel);
    }
  }
  getPointPosition(index, distanceFromCenter) {
    const me = this;
    const angle = me.getIndexAngle(index) - HALF_PI;
    return {
      x: Math.cos(angle) * distanceFromCenter + me.xCenter,
      y: Math.sin(angle) * distanceFromCenter + me.yCenter,
      angle
    };
  }
  getPointPositionForValue(index, value) {
    return this.getPointPosition(index, this.getDistanceFromCenterForValue(value));
  }
  getBasePosition(index) {
    return this.getPointPositionForValue(index || 0, this.getBaseValue());
  }
  getPointLabelPosition(index) {
    const {left, top, right, bottom} = this._pointLabelItems[index];
    return {
      left,
      top,
      right,
      bottom,
    };
  }
  drawBackground() {
    const me = this;
    const {backgroundColor, grid: {circular}} = me.options;
    if (backgroundColor) {
      const ctx = me.ctx;
      ctx.save();
      ctx.beginPath();
      pathRadiusLine(me, me.getDistanceFromCenterForValue(me._endValue), circular, me.getLabels().length);
      ctx.closePath();
      ctx.fillStyle = backgroundColor;
      ctx.fill();
      ctx.restore();
    }
  }
  drawGrid() {
    const me = this;
    const ctx = me.ctx;
    const opts = me.options;
    const {angleLines, grid} = opts;
    const labelCount = me.getLabels().length;
    let i, offset, position;
    if (opts.pointLabels.display) {
      drawPointLabels(me, labelCount);
    }
    if (grid.display) {
      me.ticks.forEach((tick, index) => {
        if (index !== 0) {
          offset = me.getDistanceFromCenterForValue(tick.value);
          const optsAtIndex = grid.setContext(me.getContext(index - 1));
          drawRadiusLine(me, optsAtIndex, offset, labelCount);
        }
      });
    }
    if (angleLines.display) {
      ctx.save();
      for (i = me.getLabels().length - 1; i >= 0; i--) {
        const optsAtIndex = angleLines.setContext(me.getPointLabelContext(i));
        const {color, lineWidth} = optsAtIndex;
        if (!lineWidth || !color) {
          continue;
        }
        ctx.lineWidth = lineWidth;
        ctx.strokeStyle = color;
        ctx.setLineDash(optsAtIndex.borderDash);
        ctx.lineDashOffset = optsAtIndex.borderDashOffset;
        offset = me.getDistanceFromCenterForValue(opts.ticks.reverse ? me.min : me.max);
        position = me.getPointPosition(i, offset);
        ctx.beginPath();
        ctx.moveTo(me.xCenter, me.yCenter);
        ctx.lineTo(position.x, position.y);
        ctx.stroke();
      }
      ctx.restore();
    }
  }
  drawBorder() {}
  drawLabels() {
    const me = this;
    const ctx = me.ctx;
    const opts = me.options;
    const tickOpts = opts.ticks;
    if (!tickOpts.display) {
      return;
    }
    const startAngle = me.getIndexAngle(0);
    let offset, width;
    ctx.save();
    ctx.translate(me.xCenter, me.yCenter);
    ctx.rotate(startAngle);
    ctx.textAlign = 'center';
    ctx.textBaseline = 'middle';
    me.ticks.forEach((tick, index) => {
      if (index === 0 && !opts.reverse) {
        return;
      }
      const optsAtIndex = tickOpts.setContext(me.getContext(index));
      const tickFont = toFont(optsAtIndex.font);
      offset = me.getDistanceFromCenterForValue(me.ticks[index].value);
      if (optsAtIndex.showLabelBackdrop) {
        ctx.font = tickFont.string;
        width = ctx.measureText(tick.label).width;
        ctx.fillStyle = optsAtIndex.backdropColor;
        const padding = toPadding(optsAtIndex.backdropPadding);
        ctx.fillRect(
          -width / 2 - padding.left,
          -offset - tickFont.size / 2 - padding.top,
          width + padding.width,
          tickFont.size + padding.height
        );
      }
      renderText(ctx, tick.label, 0, -offset, tickFont, {
        color: optsAtIndex.color,
      });
    });
    ctx.restore();
  }
  drawTitle() {}
}
RadialLinearScale.id = 'radialLinear';
RadialLinearScale.defaults = {
  display: true,
  animate: true,
  position: 'chartArea',
  angleLines: {
    display: true,
    lineWidth: 1,
    borderDash: [],
    borderDashOffset: 0.0
  },
  grid: {
    circular: false
  },
  startAngle: 0,
  ticks: {
    showLabelBackdrop: true,
    callback: Ticks.formatters.numeric
  },
  pointLabels: {
    backdropColor: undefined,
    backdropPadding: 2,
    display: true,
    font: {
      size: 10
    },
    callback(label) {
      return label;
    },
    padding: 5
  }
};
RadialLinearScale.defaultRoutes = {
  'angleLines.color': 'borderColor',
  'pointLabels.color': 'color',
  'ticks.color': 'color'
};
RadialLinearScale.descriptors = {
  angleLines: {
    _fallback: 'grid'
  }
};

const INTERVALS = {
  millisecond: {common: true, size: 1, steps: 1000},
  second: {common: true, size: 1000, steps: 60},
  minute: {common: true, size: 60000, steps: 60},
  hour: {common: true, size: 3600000, steps: 24},
  day: {common: true, size: 86400000, steps: 30},
  week: {common: false, size: 604800000, steps: 4},
  month: {common: true, size: 2.628e9, steps: 12},
  quarter: {common: false, size: 7.884e9, steps: 4},
  year: {common: true, size: 3.154e10}
};
const UNITS = (Object.keys(INTERVALS));
function sorter(a, b) {
  return a - b;
}
function parse(scale, input) {
  if (isNullOrUndef(input)) {
    return null;
  }
  const adapter = scale._adapter;
  const {parser, round, isoWeekday} = scale._parseOpts;
  let value = input;
  if (typeof parser === 'function') {
    value = parser(value);
  }
  if (!isNumberFinite(value)) {
    value = typeof parser === 'string'
      ? adapter.parse(value, parser)
      : adapter.parse(value);
  }
  if (value === null) {
    return null;
  }
  if (round) {
    value = round === 'week' && (isNumber(isoWeekday) || isoWeekday === true)
      ? adapter.startOf(value, 'isoWeek', isoWeekday)
      : adapter.startOf(value, round);
  }
  return +value;
}
function determineUnitForAutoTicks(minUnit, min, max, capacity) {
  const ilen = UNITS.length;
  for (let i = UNITS.indexOf(minUnit); i < ilen - 1; ++i) {
    const interval = INTERVALS[UNITS[i]];
    const factor = interval.steps ? interval.steps : Number.MAX_SAFE_INTEGER;
    if (interval.common && Math.ceil((max - min) / (factor * interval.size)) <= capacity) {
      return UNITS[i];
    }
  }
  return UNITS[ilen - 1];
}
function determineUnitForFormatting(scale, numTicks, minUnit, min, max) {
  for (let i = UNITS.length - 1; i >= UNITS.indexOf(minUnit); i--) {
    const unit = UNITS[i];
    if (INTERVALS[unit].common && scale._adapter.diff(max, min, unit) >= numTicks - 1) {
      return unit;
    }
  }
  return UNITS[minUnit ? UNITS.indexOf(minUnit) : 0];
}
function determineMajorUnit(unit) {
  for (let i = UNITS.indexOf(unit) + 1, ilen = UNITS.length; i < ilen; ++i) {
    if (INTERVALS[UNITS[i]].common) {
      return UNITS[i];
    }
  }
}
function addTick(ticks, time, timestamps) {
  if (!timestamps) {
    ticks[time] = true;
  } else if (timestamps.length) {
    const {lo, hi} = _lookup(timestamps, time);
    const timestamp = timestamps[lo] >= time ? timestamps[lo] : timestamps[hi];
    ticks[timestamp] = true;
  }
}
function setMajorTicks(scale, ticks, map, majorUnit) {
  const adapter = scale._adapter;
  const first = +adapter.startOf(ticks[0].value, majorUnit);
  const last = ticks[ticks.length - 1].value;
  let major, index;
  for (major = first; major <= last; major = +adapter.add(major, 1, majorUnit)) {
    index = map[major];
    if (index >= 0) {
      ticks[index].major = true;
    }
  }
  return ticks;
}
function ticksFromTimestamps(scale, values, majorUnit) {
  const ticks = [];
  const map = {};
  const ilen = values.length;
  let i, value;
  for (i = 0; i < ilen; ++i) {
    value = values[i];
    map[value] = i;
    ticks.push({
      value,
      major: false
    });
  }
  return (ilen === 0 || !majorUnit) ? ticks : setMajorTicks(scale, ticks, map, majorUnit);
}
class TimeScale extends Scale {
  constructor(props) {
    super(props);
    this._cache = {
      data: [],
      labels: [],
      all: []
    };
    this._unit = 'day';
    this._majorUnit = undefined;
    this._offsets = {};
    this._normalized = false;
    this._parseOpts = undefined;
  }
  init(scaleOpts, opts) {
    const time = scaleOpts.time || (scaleOpts.time = {});
    const adapter = this._adapter = new adapters._date(scaleOpts.adapters.date);
    mergeIf(time.displayFormats, adapter.formats());
    this._parseOpts = {
      parser: time.parser,
      round: time.round,
      isoWeekday: time.isoWeekday
    };
    super.init(scaleOpts);
    this._normalized = opts.normalized;
  }
  parse(raw, index) {
    if (raw === undefined) {
      return null;
    }
    return parse(this, raw);
  }
  beforeLayout() {
    super.beforeLayout();
    this._cache = {
      data: [],
      labels: [],
      all: []
    };
  }
  determineDataLimits() {
    const me = this;
    const options = me.options;
    const adapter = me._adapter;
    const unit = options.time.unit || 'day';
    let {min, max, minDefined, maxDefined} = me.getUserBounds();
    function _applyBounds(bounds) {
      if (!minDefined && !isNaN(bounds.min)) {
        min = Math.min(min, bounds.min);
      }
      if (!maxDefined && !isNaN(bounds.max)) {
        max = Math.max(max, bounds.max);
      }
    }
    if (!minDefined || !maxDefined) {
      _applyBounds(me._getLabelBounds());
      if (options.bounds !== 'ticks' || options.ticks.source !== 'labels') {
        _applyBounds(me.getMinMax(false));
      }
    }
    min = isNumberFinite(min) && !isNaN(min) ? min : +adapter.startOf(Date.now(), unit);
    max = isNumberFinite(max) && !isNaN(max) ? max : +adapter.endOf(Date.now(), unit) + 1;
    me.min = Math.min(min, max - 1);
    me.max = Math.max(min + 1, max);
  }
  _getLabelBounds() {
    const arr = this.getLabelTimestamps();
    let min = Number.POSITIVE_INFINITY;
    let max = Number.NEGATIVE_INFINITY;
    if (arr.length) {
      min = arr[0];
      max = arr[arr.length - 1];
    }
    return {min, max};
  }
  buildTicks() {
    const me = this;
    const options = me.options;
    const timeOpts = options.time;
    const tickOpts = options.ticks;
    const timestamps = tickOpts.source === 'labels' ? me.getLabelTimestamps() : me._generate();
    if (options.bounds === 'ticks' && timestamps.length) {
      me.min = me._userMin || timestamps[0];
      me.max = me._userMax || timestamps[timestamps.length - 1];
    }
    const min = me.min;
    const max = me.max;
    const ticks = _filterBetween(timestamps, min, max);
    me._unit = timeOpts.unit || (tickOpts.autoSkip
      ? determineUnitForAutoTicks(timeOpts.minUnit, me.min, me.max, me._getLabelCapacity(min))
      : determineUnitForFormatting(me, ticks.length, timeOpts.minUnit, me.min, me.max));
    me._majorUnit = !tickOpts.major.enabled || me._unit === 'year' ? undefined
      : determineMajorUnit(me._unit);
    me.initOffsets(timestamps);
    if (options.reverse) {
      ticks.reverse();
    }
    return ticksFromTimestamps(me, ticks, me._majorUnit);
  }
  initOffsets(timestamps) {
    const me = this;
    let start = 0;
    let end = 0;
    let first, last;
    if (me.options.offset && timestamps.length) {
      first = me.getDecimalForValue(timestamps[0]);
      if (timestamps.length === 1) {
        start = 1 - first;
      } else {
        start = (me.getDecimalForValue(timestamps[1]) - first) / 2;
      }
      last = me.getDecimalForValue(timestamps[timestamps.length - 1]);
      if (timestamps.length === 1) {
        end = last;
      } else {
        end = (last - me.getDecimalForValue(timestamps[timestamps.length - 2])) / 2;
      }
    }
    const limit = timestamps.length < 3 ? 0.5 : 0.25;
    start = _limitValue(start, 0, limit);
    end = _limitValue(end, 0, limit);
    me._offsets = {start, end, factor: 1 / (start + 1 + end)};
  }
  _generate() {
    const me = this;
    const adapter = me._adapter;
    const min = me.min;
    const max = me.max;
    const options = me.options;
    const timeOpts = options.time;
    const minor = timeOpts.unit || determineUnitForAutoTicks(timeOpts.minUnit, min, max, me._getLabelCapacity(min));
    const stepSize = valueOrDefault(timeOpts.stepSize, 1);
    const weekday = minor === 'week' ? timeOpts.isoWeekday : false;
    const hasWeekday = isNumber(weekday) || weekday === true;
    const ticks = {};
    let first = min;
    let time, count;
    if (hasWeekday) {
      first = +adapter.startOf(first, 'isoWeek', weekday);
    }
    first = +adapter.startOf(first, hasWeekday ? 'day' : minor);
    if (adapter.diff(max, min, minor) > 100000 * stepSize) {
      throw new Error(min + ' and ' + max + ' are too far apart with stepSize of ' + stepSize + ' ' + minor);
    }
    const timestamps = options.ticks.source === 'data' && me.getDataTimestamps();
    for (time = first, count = 0; time < max; time = +adapter.add(time, stepSize, minor), count++) {
      addTick(ticks, time, timestamps);
    }
    if (time === max || options.bounds === 'ticks' || count === 1) {
      addTick(ticks, time, timestamps);
    }
    return Object.keys(ticks).sort((a, b) => a - b).map(x => +x);
  }
  getLabelForValue(value) {
    const me = this;
    const adapter = me._adapter;
    const timeOpts = me.options.time;
    if (timeOpts.tooltipFormat) {
      return adapter.format(value, timeOpts.tooltipFormat);
    }
    return adapter.format(value, timeOpts.displayFormats.datetime);
  }
  _tickFormatFunction(time, index, ticks, format) {
    const me = this;
    const options = me.options;
    const formats = options.time.displayFormats;
    const unit = me._unit;
    const majorUnit = me._majorUnit;
    const minorFormat = unit && formats[unit];
    const majorFormat = majorUnit && formats[majorUnit];
    const tick = ticks[index];
    const major = majorUnit && majorFormat && tick && tick.major;
    const label = me._adapter.format(time, format || (major ? majorFormat : minorFormat));
    const formatter = options.ticks.callback;
    return formatter ? callback(formatter, [label, index, ticks], me) : label;
  }
  generateTickLabels(ticks) {
    let i, ilen, tick;
    for (i = 0, ilen = ticks.length; i < ilen; ++i) {
      tick = ticks[i];
      tick.label = this._tickFormatFunction(tick.value, i, ticks);
    }
  }
  getDecimalForValue(value) {
    const me = this;
    return value === null ? NaN : (value - me.min) / (me.max - me.min);
  }
  getPixelForValue(value) {
    const me = this;
    const offsets = me._offsets;
    const pos = me.getDecimalForValue(value);
    return me.getPixelForDecimal((offsets.start + pos) * offsets.factor);
  }
  getValueForPixel(pixel) {
    const me = this;
    const offsets = me._offsets;
    const pos = me.getDecimalForPixel(pixel) / offsets.factor - offsets.end;
    return me.min + pos * (me.max - me.min);
  }
  _getLabelSize(label) {
    const me = this;
    const ticksOpts = me.options.ticks;
    const tickLabelWidth = me.ctx.measureText(label).width;
    const angle = toRadians(me.isHorizontal() ? ticksOpts.maxRotation : ticksOpts.minRotation);
    const cosRotation = Math.cos(angle);
    const sinRotation = Math.sin(angle);
    const tickFontSize = me._resolveTickFontOptions(0).size;
    return {
      w: (tickLabelWidth * cosRotation) + (tickFontSize * sinRotation),
      h: (tickLabelWidth * sinRotation) + (tickFontSize * cosRotation)
    };
  }
  _getLabelCapacity(exampleTime) {
    const me = this;
    const timeOpts = me.options.time;
    const displayFormats = timeOpts.displayFormats;
    const format = displayFormats[timeOpts.unit] || displayFormats.millisecond;
    const exampleLabel = me._tickFormatFunction(exampleTime, 0, ticksFromTimestamps(me, [exampleTime], me._majorUnit), format);
    const size = me._getLabelSize(exampleLabel);
    const capacity = Math.floor(me.isHorizontal() ? me.width / size.w : me.height / size.h) - 1;
    return capacity > 0 ? capacity : 1;
  }
  getDataTimestamps() {
    const me = this;
    let timestamps = me._cache.data || [];
    let i, ilen;
    if (timestamps.length) {
      return timestamps;
    }
    const metas = me.getMatchingVisibleMetas();
    if (me._normalized && metas.length) {
      return (me._cache.data = metas[0].controller.getAllParsedValues(me));
    }
    for (i = 0, ilen = metas.length; i < ilen; ++i) {
      timestamps = timestamps.concat(metas[i].controller.getAllParsedValues(me));
    }
    return (me._cache.data = me.normalize(timestamps));
  }
  getLabelTimestamps() {
    const me = this;
    const timestamps = me._cache.labels || [];
    let i, ilen;
    if (timestamps.length) {
      return timestamps;
    }
    const labels = me.getLabels();
    for (i = 0, ilen = labels.length; i < ilen; ++i) {
      timestamps.push(parse(me, labels[i]));
    }
    return (me._cache.labels = me._normalized ? timestamps : me.normalize(timestamps));
  }
  normalize(values) {
    return _arrayUnique(values.sort(sorter));
  }
}
TimeScale.id = 'time';
TimeScale.defaults = {
  bounds: 'data',
  adapters: {},
  time: {
    parser: false,
    unit: false,
    round: false,
    isoWeekday: false,
    minUnit: 'millisecond',
    displayFormats: {}
  },
  ticks: {
    source: 'auto',
    major: {
      enabled: false
    }
  }
};

function interpolate(table, val, reverse) {
  let lo = 0;
  let hi = table.length - 1;
  let prevSource, nextSource, prevTarget, nextTarget;
  if (reverse) {
    if (val >= table[lo].pos && val <= table[hi].pos) {
      ({lo, hi} = _lookupByKey(table, 'pos', val));
    }
    ({pos: prevSource, time: prevTarget} = table[lo]);
    ({pos: nextSource, time: nextTarget} = table[hi]);
  } else {
    if (val >= table[lo].time && val <= table[hi].time) {
      ({lo, hi} = _lookupByKey(table, 'time', val));
    }
    ({time: prevSource, pos: prevTarget} = table[lo]);
    ({time: nextSource, pos: nextTarget} = table[hi]);
  }
  const span = nextSource - prevSource;
  return span ? prevTarget + (nextTarget - prevTarget) * (val - prevSource) / span : prevTarget;
}
class TimeSeriesScale extends TimeScale {
  constructor(props) {
    super(props);
    this._table = [];
    this._minPos = undefined;
    this._tableRange = undefined;
  }
  initOffsets() {
    const me = this;
    const timestamps = me._getTimestampsForTable();
    const table = me._table = me.buildLookupTable(timestamps);
    me._minPos = interpolate(table, me.min);
    me._tableRange = interpolate(table, me.max) - me._minPos;
    super.initOffsets(timestamps);
  }
  buildLookupTable(timestamps) {
    const {min, max} = this;
    const items = [];
    const table = [];
    let i, ilen, prev, curr, next;
    for (i = 0, ilen = timestamps.length; i < ilen; ++i) {
      curr = timestamps[i];
      if (curr >= min && curr <= max) {
        items.push(curr);
      }
    }
    if (items.length < 2) {
      return [
        {time: min, pos: 0},
        {time: max, pos: 1}
      ];
    }
    for (i = 0, ilen = items.length; i < ilen; ++i) {
      next = items[i + 1];
      prev = items[i - 1];
      curr = items[i];
      if (Math.round((next + prev) / 2) !== curr) {
        table.push({time: curr, pos: i / (ilen - 1)});
      }
    }
    return table;
  }
  _getTimestampsForTable() {
    const me = this;
    let timestamps = me._cache.all || [];
    if (timestamps.length) {
      return timestamps;
    }
    const data = me.getDataTimestamps();
    const label = me.getLabelTimestamps();
    if (data.length && label.length) {
      timestamps = me.normalize(data.concat(label));
    } else {
      timestamps = data.length ? data : label;
    }
    timestamps = me._cache.all = timestamps;
    return timestamps;
  }
  getDecimalForValue(value) {
    return (interpolate(this._table, value) - this._minPos) / this._tableRange;
  }
  getValueForPixel(pixel) {
    const me = this;
    const offsets = me._offsets;
    const decimal = me.getDecimalForPixel(pixel) / offsets.factor - offsets.end;
    return interpolate(me._table, decimal * me._tableRange + me._minPos, true);
  }
}
TimeSeriesScale.id = 'timeseries';
TimeSeriesScale.defaults = TimeScale.defaults;

var scales = /*#__PURE__*/Object.freeze({
__proto__: null,
CategoryScale: CategoryScale,
LinearScale: LinearScale,
LogarithmicScale: LogarithmicScale,
RadialLinearScale: RadialLinearScale,
TimeScale: TimeScale,
TimeSeriesScale: TimeSeriesScale
});

const registerables = [
  controllers,
  elements,
  plugins,
  scales,
];

export { Animation, Animations, ArcElement, BarController, BarElement, BasePlatform, BasicPlatform, BubbleController, CategoryScale, Chart, DatasetController, plugin_decimation as Decimation, DomPlatform, DoughnutController, Element, plugin_filler as Filler, Interaction, plugin_legend as Legend, LineController, LineElement, LinearScale, LogarithmicScale, PieController, PointElement, PolarAreaController, RadarController, RadialLinearScale, Scale, ScatterController, plugin_subtitle as SubTitle, Ticks, TimeScale, TimeSeriesScale, plugin_title as Title, plugin_tooltip as Tooltip, adapters as _adapters, _detectPlatform, animator, controllers, elements, layouts, plugins, registerables, registry, scales };