chart.js/dist/chart.esm.js

Simple HTML5 charts using the canvas element.

/*!
 * Chart.js v3.9.0
 * https://www.chartjs.org
 * (c) 2022 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 createContext, j as defined, s as sign, k as isNullOrUndef, _ as _arrayUnique, t as toRadians, m as toPercentage, n as toDimension, T as TAU, o as formatNumber, p as _angleBetween, H as HALF_PI, P as PI, q as _getStartAndCountOfVisiblePoints, w as _scaleRangesChanged, x as isNumber, y as _parseObjectDataRadialScale, z as log10, A as _factorize, B as finiteOrDefault, C as callback, D as _addGrace, E as _limitValue, F as toDegrees, G as _measureText, I as _int16Range, J as _alignPixel, K as toPadding, L as clipArea, M as renderText, N as unclipArea, O as toFont, Q as each, R as _toLeftRightCenter, S as _alignStartEnd, U as overrides, V as merge, W as _capitalize, X as getRelativePosition, Y as _rlookupByKey, Z as _lookupByKey, $ as _isPointInArea, a0 as getAngleFromPoint, a1 as getMaximumSize, a2 as _getParentNode, a3 as readUsedSize, a4 as throttled, a5 as supportsEventListenerOptions, a6 as _isDomSupported, a7 as descriptors, a8 as isFunction, a9 as _attachContext, aa as _createResolver, ab as _descriptors, ac as mergeIf, ad as uid, ae as debounce, af as retinaScale, ag as clearCanvas, ah as setsEqual, ai as _elementsEqual, aj as _isClickEvent, ak as _isBetween, al as _readValueToProps, am as _updateBezierControlPoints, an as _computeSegments, ao as _boundSegments, ap as _steppedInterpolation, aq as _bezierInterpolation, ar as _pointInLine, as as _steppedLineTo, at as _bezierCurveTo, au as drawPoint, av as addRoundedRectPath, aw as toTRBL, ax as toTRBLCorners, ay as _boundSegment, az as _normalizeAngle, aA as getRtlAdapter, aB as overrideTextDirection, aC as _textX, aD as restoreTextDirection, aE as drawPointLegend, aF as noop, aG as distanceBetweenPoints, aH as _setMinAndMaxByKey, aI as niceNum, aJ as almostWhole, aK as almostEquals, aL as _decimalPlaces, aM as _longestText, aN as _filterBetween, aO 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() {
    if (this._request) {
      return;
    }
    this._running = true;
    this._request = requestAnimFrame.call(window, () => {
      this._update();
      this._request = null;
      if (this._running) {
        this._refresh();
      }
    });
  }
  _update(date = Date.now()) {
    let remaining = 0;
    this._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();
        this._notify(chart, anims, date, 'progress');
      }
      if (!items.length) {
        anims.running = false;
        this._notify(chart, anims, date, 'complete');
        anims.initial = false;
      }
      remaining += items.length;
    });
    this._lastDate = date;
    if (remaining === 0) {
      this._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) {
    if (this._active) {
      this._notify(false);
      const currentValue = this._target[this._prop];
      const elapsed = date - this._start;
      const remain = this._duration - elapsed;
      this._start = date;
      this._duration = Math.floor(Math.max(remain, cfg.duration));
      this._total += elapsed;
      this._loop = !!cfg.loop;
      this._to = resolve([cfg.to, to, currentValue, cfg.from]);
      this._from = resolve([cfg.from, currentValue, to]);
    }
  }
  cancel() {
    if (this._active) {
      this.tick(Date.now());
      this._active = false;
      this._notify(false);
    }
  }
  tick(date) {
    const elapsed = date - this._start;
    const duration = this._duration;
    const prop = this._prop;
    const from = this._from;
    const loop = this._loop;
    const to = this._to;
    let factor;
    this._active = from !== to && (loop || (elapsed < duration));
    if (!this._active) {
      this._target[prop] = to;
      this._notify(true);
      return;
    }
    if (elapsed < 0) {
      this._target[prop] = from;
      return;
    }
    factor = (elapsed / duration) % 2;
    factor = loop && factor > 1 ? 2 - factor : factor;
    factor = this._easing(Math.min(1, Math.max(0, factor)));
    this._target[prop] = this._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, type) {
  for (const meta of vScale.getMatchingVisibleMetas(type).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, meta.type);
    stack._bottom = getLastIndexInStack(stack, vScale, false, meta.type);
  }
}
function getFirstScaleId(chart, axis) {
  const scales = chart.scales;
  return Object.keys(scales).filter(key => scales[key].axis === axis).shift();
}
function createDatasetContext(parent, index) {
  return createContext(parent,
    {
      active: false,
      dataset: undefined,
      datasetIndex: index,
      index,
      mode: 'default',
      type: 'dataset'
    }
  );
}
function createDataContext(parent, index, element) {
  return createContext(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);
const createStack = (canStack, meta, chart) => canStack && !meta.hidden && meta._stacked
  && {keys: getSortedDatasetIndices(chart, true), values: null};
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.supportsDecimation = false;
    this.$context = undefined;
    this._syncList = [];
    this.initialize();
  }
  initialize() {
    const meta = this._cachedMeta;
    this.configure();
    this.linkScales();
    meta._stacked = isStacked(meta.vScale, meta);
    this.addElements();
  }
  updateIndex(datasetIndex) {
    if (this.index !== datasetIndex) {
      clearStacks(this._cachedMeta);
    }
    this.index = datasetIndex;
  }
  linkScales() {
    const chart = this.chart;
    const meta = this._cachedMeta;
    const dataset = this.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 = this.getScaleForId(xid);
    meta.yScale = this.getScaleForId(yid);
    meta.rScale = this.getScaleForId(rid);
    meta.iScale = this.getScaleForId(iid);
    meta.vScale = this.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 dataset = this.getDataset();
    const data = dataset.data || (dataset.data = []);
    const _data = this._data;
    if (isObject(data)) {
      this._data = convertObjectDataToArray(data);
    } else if (_data !== data) {
      if (_data) {
        unlistenArrayEvents(_data, this);
        const meta = this._cachedMeta;
        clearStacks(meta);
        meta._parsed = [];
      }
      if (data && Object.isExtensible(data)) {
        listenArrayEvents(data, this);
      }
      this._syncList = [];
      this._data = data;
    }
  }
  addElements() {
    const meta = this._cachedMeta;
    this._dataCheck();
    if (this.datasetElementType) {
      meta.dataset = new this.datasetElementType();
    }
  }
  buildOrUpdateElements(resetNewElements) {
    const meta = this._cachedMeta;
    const dataset = this.getDataset();
    let stackChanged = false;
    this._dataCheck();
    const oldStacked = meta._stacked;
    meta._stacked = isStacked(meta.vScale, meta);
    if (meta.stack !== dataset.stack) {
      stackChanged = true;
      clearStacks(meta);
      meta.stack = dataset.stack;
    }
    this._resyncElements(resetNewElements);
    if (stackChanged || oldStacked !== meta._stacked) {
      updateStacks(this, meta._parsed);
    }
  }
  configure() {
    const config = this.chart.config;
    const scopeKeys = config.datasetScopeKeys(this._type);
    const scopes = config.getOptionScopes(this.getDataset(), scopeKeys, true);
    this.options = config.createResolver(scopes, this.getContext());
    this._parsing = this.options.parsing;
    this._cachedDataOpts = {};
  }
  parse(start, count) {
    const {_cachedMeta: meta, _data: data} = this;
    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 (this._parsing === false) {
      meta._parsed = data;
      meta._sorted = true;
      parsed = data;
    } else {
      if (isArray(data[start])) {
        parsed = this.parseArrayData(meta, data, start, count);
      } else if (isObject(data[start])) {
        parsed = this.parseObjectData(meta, data, start, count);
      } else {
        parsed = this.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(this, 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;
      value = applyStack(stack, parsedValue, this._cachedMeta.index);
    }
    range.min = Math.min(range.min, value);
    range.max = Math.max(range.max, value);
  }
  getMinMax(scale, canStack) {
    const meta = this._cachedMeta;
    const _parsed = meta._parsed;
    const sorted = meta._sorted && scale === meta.iScale;
    const ilen = _parsed.length;
    const otherScale = this._getOtherScale(scale);
    const stack = createStack(canStack, meta, this.chart);
    const range = {min: Number.POSITIVE_INFINITY, max: Number.NEGATIVE_INFINITY};
    const {min: otherMin, max: otherMax} = getUserBounds(otherScale);
    let i, parsed;
    function _skip() {
      parsed = _parsed[i];
      const otherValue = parsed[otherScale.axis];
      return !isNumberFinite(parsed[scale.axis]) || otherMin > otherValue || otherMax < otherValue;
    }
    for (i = 0; i < ilen; ++i) {
      if (_skip()) {
        continue;
      }
      this.updateRangeFromParsed(range, scale, parsed, stack);
      if (sorted) {
        break;
      }
    }
    if (sorted) {
      for (i = ilen - 1; i >= 0; --i) {
        if (_skip()) {
          continue;
        }
        this.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 meta = this._cachedMeta;
    const iScale = meta.iScale;
    const vScale = meta.vScale;
    const parsed = this.getParsed(index);
    return {
      label: iScale ? '' + iScale.getLabelForValue(parsed[iScale.axis]) : '',
      value: vScale ? '' + vScale.getLabelForValue(parsed[vScale.axis]) : ''
    };
  }
  _update(mode) {
    const meta = this._cachedMeta;
    this.update(mode || 'default');
    meta._clip = toClip(valueOrDefault(this.options.clip, defaultClip(meta.xScale, meta.yScale, this.getMaxOverflow())));
  }
  update(mode) {}
  draw() {
    const ctx = this._ctx;
    const chart = this.chart;
    const meta = this._cachedMeta;
    const elements = meta.data || [];
    const area = chart.chartArea;
    const active = [];
    const start = this._drawStart || 0;
    const count = this._drawCount || (elements.length - start);
    const drawActiveElementsOnTop = this.options.drawActiveElementsOnTop;
    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 && drawActiveElementsOnTop) {
        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 dataset = this.getDataset();
    let context;
    if (index >= 0 && index < this._cachedMeta.data.length) {
      const element = this._cachedMeta.data[index];
      context = element.$context ||
        (element.$context = createDataContext(this.getContext(), index, element));
      context.parsed = this.getParsed(index);
      context.raw = dataset.data[index];
      context.index = context.dataIndex = index;
    } else {
      context = this.$context ||
        (this.$context = createDatasetContext(this.chart.getContext(), this.index));
      context.dataset = dataset;
      context.index = context.datasetIndex = this.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 active = mode === 'active';
    const cache = this._cachedDataOpts;
    const cacheKey = elementType + '-' + mode;
    const cached = cache[cacheKey];
    const sharing = this.enableOptionSharing && defined(index);
    if (cached) {
      return cloneIfNotShared(cached, sharing);
    }
    const config = this.chart.config;
    const scopeKeys = config.datasetElementScopeKeys(this._type, elementType);
    const prefixes = active ? [`${elementType}Hover`, 'hover', elementType, ''] : [elementType, ''];
    const scopes = config.getOptionScopes(this.getDataset(), scopeKeys);
    const names = Object.keys(defaults.elements[elementType]);
    const context = () => this.getContext(index, active);
    const values = config.resolveNamedOptions(scopes, names, context, prefixes);
    if (values.$shared) {
      values.$shared = sharing;
      cache[cacheKey] = Object.freeze(cloneIfNotShared(values, sharing));
    }
    return values;
  }
  _resolveAnimations(index, transition, active) {
    const chart = this.chart;
    const cache = this._cachedDataOpts;
    const cacheKey = `animation-${transition}`;
    const cached = cache[cacheKey];
    if (cached) {
      return cached;
    }
    let options;
    if (chart.options.animation !== false) {
      const config = this.chart.config;
      const scopeKeys = config.datasetAnimationScopeKeys(this._type, transition);
      const scopes = config.getOptionScopes(this.getDataset(), scopeKeys);
      options = config.createResolver(scopes, this.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;
  }
  _getSharedOptions(start, mode) {
    const firstOpts = this.resolveDataElementOptions(start, mode);
    const previouslySharedOptions = this._sharedOptions;
    const sharedOptions = this.getSharedOptions(firstOpts);
    const includeOptions = this.includeOptions(mode, sharedOptions) || (sharedOptions !== previouslySharedOptions);
    this.updateSharedOptions(sharedOptions, mode, firstOpts);
    return {sharedOptions, includeOptions};
  }
  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 data = this._data;
    const elements = this._cachedMeta.data;
    for (const [method, arg1, arg2] of this._syncList) {
      this[method](arg1, arg2);
    }
    this._syncList = [];
    const numMeta = elements.length;
    const numData = data.length;
    const count = Math.min(numData, numMeta);
    if (count) {
      this.parse(0, count);
    }
    if (numData > numMeta) {
      this._insertElements(numMeta, numData - numMeta, resetNewElements);
    } else if (numData < numMeta) {
      this._removeElements(numData, numMeta - numData);
    }
  }
  _insertElements(start, count, resetNewElements = true) {
    const meta = this._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 this.dataElementType();
    }
    if (this._parsing) {
      move(meta._parsed);
    }
    this.parse(start, count);
    if (resetNewElements) {
      this.updateElements(data, start, count, 'reset');
    }
  }
  updateElements(element, start, count, mode) {}
  _removeElements(start, count) {
    const meta = this._cachedMeta;
    if (this._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);
    }
    this.chart._dataChanges.push([this.index, ...args]);
  }
  _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) {
    if (count) {
      this._sync(['_removeElements', start, count]);
    }
    const newCount = arguments.length - 2;
    if (newCount) {
      this._sync(['_insertElements', start, newCount]);
    }
  }
  _onDataUnshift() {
    this._sync(['_insertElements', 0, arguments.length]);
  }
}
DatasetController.defaults = {};
DatasetController.prototype.datasetElementType = null;
DatasetController.prototype.dataElementType = null;

function getAllScaleValues(scale, type) {
  if (!scale._cache.$bar) {
    const visibleMetas = scale.getMatchingVisibleMetas(type);
    let values = [];
    for (let i = 0, ilen = visibleMetas.length; i < ilen; i++) {
      values = values.concat(visibleMetas[i].controller.getAllParsedValues(scale));
    }
    scale._cache.$bar = _arrayUnique(values.sort((a, b) => a - b));
  }
  return scale._cache.$bar;
}
function computeMinSampleSize(meta) {
  const scale = meta.iScale;
  const values = getAllScaleValues(scale, meta.type);
  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;
  }
  if (edge === true) {
    properties.borderSkipped = {top: true, right: true, bottom: true, left: true};
    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;
}
function setInflateAmount(properties, {inflateAmount}, ratio) {
  properties.inflateAmount = inflateAmount === 'auto'
    ? ratio === 1 ? 0.33 : 0
    : inflateAmount;
}
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 meta = this._cachedMeta;
    const {iScale, vScale} = meta;
    const parsed = this.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() {
    this.enableOptionSharing = true;
    super.initialize();
    const meta = this._cachedMeta;
    meta.stack = this.getDataset().stack;
  }
  update(mode) {
    const meta = this._cachedMeta;
    this.updateElements(meta.data, 0, meta.data.length, mode);
  }
  updateElements(bars, start, count, mode) {
    const reset = mode === 'reset';
    const {index, _cachedMeta: {vScale}} = this;
    const base = vScale.getBasePixel();
    const horizontal = vScale.isHorizontal();
    const ruler = this._getRuler();
    const {sharedOptions, includeOptions} = this._getSharedOptions(start, mode);
    for (let i = start; i < start + count; i++) {
      const parsed = this.getParsed(i);
      const vpixels = reset || isNullOrUndef(parsed[vScale.axis]) ? {base, head: base} : this._calculateBarValuePixels(i);
      const ipixels = this._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 || this.resolveDataElementOptions(i, bars[i].active ? 'active' : mode);
      }
      const options = properties.options || bars[i].options;
      setBorderSkipped(properties, options, stack, index);
      setInflateAmount(properties, options, ruler.ratio);
      this.updateElement(bars[i], i, properties, mode);
    }
  }
  _getStacks(last, dataIndex) {
    const {iScale} = this._cachedMeta;
    const metasets = iScale.getMatchingVisibleMetas(this._type)
      .filter(meta => meta.controller.options.grouped);
    const stacked = iScale.options.stacked;
    const stacks = [];
    const skipNull = (meta) => {
      const parsed = meta.controller.getParsed(dataIndex);
      const val = parsed && parsed[meta.vScale.axis];
      if (isNullOrUndef(val) || isNaN(val)) {
        return true;
      }
    };
    for (const meta of metasets) {
      if (dataIndex !== undefined && skipNull(meta)) {
        continue;
      }
      if (stacked === false || stacks.indexOf(meta.stack) === -1 ||
				(stacked === undefined && meta.stack === undefined)) {
        stacks.push(meta.stack);
      }
      if (meta.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 opts = this.options;
    const meta = this._cachedMeta;
    const iScale = meta.iScale;
    const pixels = [];
    let i, ilen;
    for (i = 0, ilen = meta.data.length; i < ilen; ++i) {
      pixels.push(iScale.getPixelForValue(this.getParsed(i)[iScale.axis], i));
    }
    const barThickness = opts.barThickness;
    const min = barThickness || computeMinSampleSize(meta);
    return {
      min,
      pixels,
      start: iScale._startPixel,
      end: iScale._endPixel,
      stackCount: this._getStackCount(),
      scale: iScale,
      grouped: opts.grouped,
      ratio: barThickness ? 1 : opts.categoryPercentage * opts.barPercentage
    };
  }
  _calculateBarValuePixels(index) {
    const {_cachedMeta: {vScale, _stacked}, options: {base: baseValue, minBarLength}} = this;
    const actualBase = baseValue || 0;
    const parsed = this.getParsed(index);
    const custom = parsed._custom;
    const floating = isFloatBar(custom);
    let value = parsed[vScale.axis];
    let start = 0;
    let length = _stacked ? this.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 (this.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;
      }
      const startPixel = vScale.getPixelForDecimal(0);
      const endPixel = vScale.getPixelForDecimal(1);
      const min = Math.min(startPixel, endPixel);
      const max = Math.max(startPixel, endPixel);
      base = Math.max(Math.min(base, max), min);
      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 scale = ruler.scale;
    const options = this.options;
    const skipNull = options.skipNull;
    const maxBarThickness = valueOrDefault(options.maxBarThickness, Infinity);
    let center, size;
    if (ruler.grouped) {
      const stackCount = skipNull ? this._getStackCount(index) : ruler.stackCount;
      const range = options.barThickness === 'flex'
        ? computeFlexCategoryTraits(index, ruler, options, stackCount)
        : computeFitCategoryTraits(index, ruler, options, stackCount);
      const stackIndex = this._getStackIndex(this.index, this._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(this.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 meta = this._cachedMeta;
    const vScale = meta.vScale;
    const rects = meta.data;
    const ilen = rects.length;
    let i = 0;
    for (; i < ilen; ++i) {
      if (this.getParsed(i)[vScale.axis] !== null) {
        rects[i].draw(this._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', 'ba