;\n\n tooltipPosition(useFinalPosition: boolean): Point {\n const {x, y} = this.getProps(['x', 'y'], useFinalPosition);\n return {x, y} as Point;\n }\n\n hasValue() {\n return isNumber(this.x) && isNumber(this.y);\n }\n\n /**\n * Gets the current or final value of each prop. Can return extra properties (whole object).\n * @param props - properties to get\n * @param [final] - get the final value (animation target)\n */\n getProps(props: P, final?: boolean): Pick;\n getProps(props: P[], final?: boolean): Partial>;\n getProps(props: string[], final?: boolean): Partial> {\n const anims = this.$animations;\n if (!final || !anims) {\n // let's not create an object, if not needed\n return this as Record;\n }\n const ret: Record = {};\n props.forEach((prop) => {\n ret[prop] = anims[prop] && anims[prop].active() ? anims[prop]._to : this[prop as string];\n });\n return ret;\n }\n}\n","import {isNullOrUndef, valueOrDefault} from '../helpers/helpers.core.js';\nimport {_factorize} from '../helpers/helpers.math.js';\n\n\n/**\n * @typedef { import('./core.controller.js').default } Chart\n * @typedef {{value:number | string, label?:string, major?:boolean, $context?:any}} Tick\n */\n\n/**\n * Returns a subset of ticks to be plotted to avoid overlapping labels.\n * @param {import('./core.scale.js').default} scale\n * @param {Tick[]} ticks\n * @return {Tick[]}\n * @private\n */\nexport function autoSkip(scale, ticks) {\n const tickOpts = scale.options.ticks;\n const determinedMaxTicks = determineMaxTicks(scale);\n const ticksLimit = Math.min(tickOpts.maxTicksLimit || determinedMaxTicks, determinedMaxTicks);\n const majorIndices = tickOpts.major.enabled ? getMajorIndices(ticks) : [];\n const numMajorIndices = majorIndices.length;\n const first = majorIndices[0];\n const last = majorIndices[numMajorIndices - 1];\n const newTicks = [];\n\n // If there are too many major ticks to display them all\n if (numMajorIndices > ticksLimit) {\n skipMajors(ticks, newTicks, majorIndices, numMajorIndices / ticksLimit);\n return newTicks;\n }\n\n const spacing = calculateSpacing(majorIndices, ticks, ticksLimit);\n\n if (numMajorIndices > 0) {\n let i, ilen;\n const avgMajorSpacing = numMajorIndices > 1 ? Math.round((last - first) / (numMajorIndices - 1)) : null;\n skip(ticks, newTicks, spacing, isNullOrUndef(avgMajorSpacing) ? 0 : first - avgMajorSpacing, first);\n for (i = 0, ilen = numMajorIndices - 1; i < ilen; i++) {\n skip(ticks, newTicks, spacing, majorIndices[i], majorIndices[i + 1]);\n }\n skip(ticks, newTicks, spacing, last, isNullOrUndef(avgMajorSpacing) ? ticks.length : last + avgMajorSpacing);\n return newTicks;\n }\n skip(ticks, newTicks, spacing);\n return newTicks;\n}\n\nfunction determineMaxTicks(scale) {\n const offset = scale.options.offset;\n const tickLength = scale._tickSize();\n const maxScale = scale._length / tickLength + (offset ? 0 : 1);\n const maxChart = scale._maxLength / tickLength;\n return Math.floor(Math.min(maxScale, maxChart));\n}\n\n/**\n * @param {number[]} majorIndices\n * @param {Tick[]} ticks\n * @param {number} ticksLimit\n */\nfunction calculateSpacing(majorIndices, ticks, ticksLimit) {\n const evenMajorSpacing = getEvenSpacing(majorIndices);\n const spacing = ticks.length / ticksLimit;\n\n // If the major ticks are evenly spaced apart, place the minor ticks\n // so that they divide the major ticks into even chunks\n if (!evenMajorSpacing) {\n return Math.max(spacing, 1);\n }\n\n const factors = _factorize(evenMajorSpacing);\n for (let i = 0, ilen = factors.length - 1; i < ilen; i++) {\n const factor = factors[i];\n if (factor > spacing) {\n return factor;\n }\n }\n return Math.max(spacing, 1);\n}\n\n/**\n * @param {Tick[]} ticks\n */\nfunction getMajorIndices(ticks) {\n const result = [];\n let i, ilen;\n for (i = 0, ilen = ticks.length; i < ilen; i++) {\n if (ticks[i].major) {\n result.push(i);\n }\n }\n return result;\n}\n\n/**\n * @param {Tick[]} ticks\n * @param {Tick[]} newTicks\n * @param {number[]} majorIndices\n * @param {number} spacing\n */\nfunction skipMajors(ticks, newTicks, majorIndices, spacing) {\n let count = 0;\n let next = majorIndices[0];\n let i;\n\n spacing = Math.ceil(spacing);\n for (i = 0; i < ticks.length; i++) {\n if (i === next) {\n newTicks.push(ticks[i]);\n count++;\n next = majorIndices[count * spacing];\n }\n }\n}\n\n/**\n * @param {Tick[]} ticks\n * @param {Tick[]} newTicks\n * @param {number} spacing\n * @param {number} [majorStart]\n * @param {number} [majorEnd]\n */\nfunction skip(ticks, newTicks, spacing, majorStart, majorEnd) {\n const start = valueOrDefault(majorStart, 0);\n const end = Math.min(valueOrDefault(majorEnd, ticks.length), ticks.length);\n let count = 0;\n let length, i, next;\n\n spacing = Math.ceil(spacing);\n if (majorEnd) {\n length = majorEnd - majorStart;\n spacing = length / Math.floor(length / spacing);\n }\n\n next = start;\n\n while (next < 0) {\n count++;\n next = Math.round(start + count * spacing);\n }\n\n for (i = Math.max(start, 0); i < end; i++) {\n if (i === next) {\n newTicks.push(ticks[i]);\n count++;\n next = Math.round(start + count * spacing);\n }\n }\n}\n\n\n/**\n * @param {number[]} arr\n */\nfunction getEvenSpacing(arr) {\n const len = arr.length;\n let i, diff;\n\n if (len < 2) {\n return false;\n }\n\n for (diff = arr[0], i = 1; i < len; ++i) {\n if (arr[i] - arr[i - 1] !== diff) {\n return false;\n }\n }\n return diff;\n}\n","import Element from './core.element.js';\nimport {_alignPixel, _measureText, renderText, clipArea, unclipArea} from '../helpers/helpers.canvas.js';\nimport {callback as call, each, finiteOrDefault, isArray, isFinite, isNullOrUndef, isObject, valueOrDefault} from '../helpers/helpers.core.js';\nimport {toDegrees, toRadians, _int16Range, _limitValue, HALF_PI} from '../helpers/helpers.math.js';\nimport {_alignStartEnd, _toLeftRightCenter} from '../helpers/helpers.extras.js';\nimport {createContext, toFont, toPadding, _addGrace} from '../helpers/helpers.options.js';\nimport {autoSkip} from './core.scale.autoskip.js';\n\nconst reverseAlign = (align) => align === 'left' ? 'right' : align === 'right' ? 'left' : align;\nconst offsetFromEdge = (scale, edge, offset) => edge === 'top' || edge === 'left' ? scale[edge] + offset : scale[edge] - offset;\nconst getTicksLimit = (ticksLength, maxTicksLimit) => Math.min(maxTicksLimit || ticksLength, ticksLength);\n\n/**\n * @typedef { import('../types/index.js').Chart } Chart\n * @typedef {{value:number | string, label?:string, major?:boolean, $context?:any}} Tick\n */\n\n/**\n * Returns a new array containing numItems from arr\n * @param {any[]} arr\n * @param {number} numItems\n */\nfunction sample(arr, numItems) {\n const result = [];\n const increment = arr.length / numItems;\n const len = arr.length;\n let i = 0;\n\n for (; i < len; i += increment) {\n result.push(arr[Math.floor(i)]);\n }\n return result;\n}\n\n/**\n * @param {Scale} scale\n * @param {number} index\n * @param {boolean} offsetGridLines\n */\nfunction getPixelForGridLine(scale, index, offsetGridLines) {\n const length = scale.ticks.length;\n const validIndex = Math.min(index, length - 1);\n const start = scale._startPixel;\n const end = scale._endPixel;\n const epsilon = 1e-6; // 1e-6 is margin in pixels for accumulated error.\n let lineValue = scale.getPixelForTick(validIndex);\n let offset;\n\n if (offsetGridLines) {\n if (length === 1) {\n offset = Math.max(lineValue - start, end - lineValue);\n } else if (index === 0) {\n offset = (scale.getPixelForTick(1) - lineValue) / 2;\n } else {\n offset = (lineValue - scale.getPixelForTick(validIndex - 1)) / 2;\n }\n lineValue += validIndex < index ? offset : -offset;\n\n // Return undefined if the pixel is out of the range\n if (lineValue < start - epsilon || lineValue > end + epsilon) {\n return;\n }\n }\n return lineValue;\n}\n\n/**\n * @param {object} caches\n * @param {number} length\n */\nfunction garbageCollect(caches, length) {\n each(caches, (cache) => {\n const gc = cache.gc;\n const gcLen = gc.length / 2;\n let i;\n if (gcLen > length) {\n for (i = 0; i < gcLen; ++i) {\n delete cache.data[gc[i]];\n }\n gc.splice(0, gcLen);\n }\n });\n}\n\n/**\n * @param {object} options\n */\nfunction getTickMarkLength(options) {\n return options.drawTicks ? options.tickLength : 0;\n}\n\n/**\n * @param {object} options\n */\nfunction getTitleHeight(options, fallback) {\n if (!options.display) {\n return 0;\n }\n\n const font = toFont(options.font, fallback);\n const padding = toPadding(options.padding);\n const lines = isArray(options.text) ? options.text.length : 1;\n\n return (lines * font.lineHeight) + padding.height;\n}\n\nfunction createScaleContext(parent, scale) {\n return createContext(parent, {\n scale,\n type: 'scale'\n });\n}\n\nfunction createTickContext(parent, index, tick) {\n return createContext(parent, {\n tick,\n index,\n type: 'tick'\n });\n}\n\nfunction titleAlign(align, position, reverse) {\n /** @type {CanvasTextAlign} */\n let ret = _toLeftRightCenter(align);\n if ((reverse && position !== 'right') || (!reverse && position === 'right')) {\n ret = reverseAlign(ret);\n }\n return ret;\n}\n\nfunction titleArgs(scale, offset, position, align) {\n const {top, left, bottom, right, chart} = scale;\n const {chartArea, scales} = chart;\n let rotation = 0;\n let maxWidth, titleX, titleY;\n const height = bottom - top;\n const width = right - left;\n\n if (scale.isHorizontal()) {\n titleX = _alignStartEnd(align, left, right);\n\n if (isObject(position)) {\n const positionAxisID = Object.keys(position)[0];\n const value = position[positionAxisID];\n titleY = scales[positionAxisID].getPixelForValue(value) + height - offset;\n } else if (position === 'center') {\n titleY = (chartArea.bottom + chartArea.top) / 2 + height - offset;\n } else {\n titleY = offsetFromEdge(scale, position, offset);\n }\n maxWidth = right - left;\n } else {\n if (isObject(position)) {\n const positionAxisID = Object.keys(position)[0];\n const value = position[positionAxisID];\n titleX = scales[positionAxisID].getPixelForValue(value) - width + offset;\n } else if (position === 'center') {\n titleX = (chartArea.left + chartArea.right) / 2 - width + offset;\n } else {\n titleX = offsetFromEdge(scale, position, offset);\n }\n titleY = _alignStartEnd(align, bottom, top);\n rotation = position === 'left' ? -HALF_PI : HALF_PI;\n }\n return {titleX, titleY, maxWidth, rotation};\n}\n\nexport default class Scale extends Element {\n\n // eslint-disable-next-line max-statements\n constructor(cfg) {\n super();\n\n /** @type {string} */\n this.id = cfg.id;\n /** @type {string} */\n this.type = cfg.type;\n /** @type {any} */\n this.options = undefined;\n /** @type {CanvasRenderingContext2D} */\n this.ctx = cfg.ctx;\n /** @type {Chart} */\n this.chart = cfg.chart;\n\n // implements box\n /** @type {number} */\n this.top = undefined;\n /** @type {number} */\n this.bottom = undefined;\n /** @type {number} */\n this.left = undefined;\n /** @type {number} */\n this.right = undefined;\n /** @type {number} */\n this.width = undefined;\n /** @type {number} */\n this.height = undefined;\n this._margins = {\n left: 0,\n right: 0,\n top: 0,\n bottom: 0\n };\n /** @type {number} */\n this.maxWidth = undefined;\n /** @type {number} */\n this.maxHeight = undefined;\n /** @type {number} */\n this.paddingTop = undefined;\n /** @type {number} */\n this.paddingBottom = undefined;\n /** @type {number} */\n this.paddingLeft = undefined;\n /** @type {number} */\n this.paddingRight = undefined;\n\n // scale-specific properties\n /** @type {string=} */\n this.axis = undefined;\n /** @type {number=} */\n this.labelRotation = undefined;\n this.min = undefined;\n this.max = undefined;\n this._range = undefined;\n /** @type {Tick[]} */\n this.ticks = [];\n /** @type {object[]|null} */\n this._gridLineItems = null;\n /** @type {object[]|null} */\n this._labelItems = null;\n /** @type {object|null} */\n this._labelSizes = null;\n this._length = 0;\n this._maxLength = 0;\n this._longestTextCache = {};\n /** @type {number} */\n this._startPixel = undefined;\n /** @type {number} */\n this._endPixel = undefined;\n this._reversePixels = false;\n this._userMax = undefined;\n this._userMin = undefined;\n this._suggestedMax = undefined;\n this._suggestedMin = undefined;\n this._ticksLength = 0;\n this._borderValue = 0;\n this._cache = {};\n this._dataLimitsCached = false;\n this.$context = undefined;\n }\n\n /**\n\t * @param {any} options\n\t * @since 3.0\n\t */\n init(options) {\n this.options = options.setContext(this.getContext());\n\n this.axis = options.axis;\n\n // parse min/max value, so we can properly determine min/max for other scales\n this._userMin = this.parse(options.min);\n this._userMax = this.parse(options.max);\n this._suggestedMin = this.parse(options.suggestedMin);\n this._suggestedMax = this.parse(options.suggestedMax);\n }\n\n /**\n\t * Parse a supported input value to internal representation.\n\t * @param {*} raw\n\t * @param {number} [index]\n\t * @since 3.0\n\t */\n parse(raw, index) { // eslint-disable-line no-unused-vars\n return raw;\n }\n\n /**\n\t * @return {{min: number, max: number, minDefined: boolean, maxDefined: boolean}}\n\t * @protected\n\t * @since 3.0\n\t */\n getUserBounds() {\n let {_userMin, _userMax, _suggestedMin, _suggestedMax} = this;\n _userMin = finiteOrDefault(_userMin, Number.POSITIVE_INFINITY);\n _userMax = finiteOrDefault(_userMax, Number.NEGATIVE_INFINITY);\n _suggestedMin = finiteOrDefault(_suggestedMin, Number.POSITIVE_INFINITY);\n _suggestedMax = finiteOrDefault(_suggestedMax, Number.NEGATIVE_INFINITY);\n return {\n min: finiteOrDefault(_userMin, _suggestedMin),\n max: finiteOrDefault(_userMax, _suggestedMax),\n minDefined: isFinite(_userMin),\n maxDefined: isFinite(_userMax)\n };\n }\n\n /**\n\t * @param {boolean} canStack\n\t * @return {{min: number, max: number}}\n\t * @protected\n\t * @since 3.0\n\t */\n getMinMax(canStack) {\n // eslint-disable-next-line prefer-const\n let {min, max, minDefined, maxDefined} = this.getUserBounds();\n let range;\n\n if (minDefined && maxDefined) {\n return {min, max};\n }\n\n const metas = this.getMatchingVisibleMetas();\n for (let i = 0, ilen = metas.length; i < ilen; ++i) {\n range = metas[i].controller.getMinMax(this, canStack);\n if (!minDefined) {\n min = Math.min(min, range.min);\n }\n if (!maxDefined) {\n max = Math.max(max, range.max);\n }\n }\n\n // Make sure min <= max when only min or max is defined by user and the data is outside that range\n min = maxDefined && min > max ? max : min;\n max = minDefined && min > max ? min : max;\n\n return {\n min: finiteOrDefault(min, finiteOrDefault(max, min)),\n max: finiteOrDefault(max, finiteOrDefault(min, max))\n };\n }\n\n /**\n\t * Get the padding needed for the scale\n\t * @return {{top: number, left: number, bottom: number, right: number}} the necessary padding\n\t * @private\n\t */\n getPadding() {\n return {\n left: this.paddingLeft || 0,\n top: this.paddingTop || 0,\n right: this.paddingRight || 0,\n bottom: this.paddingBottom || 0\n };\n }\n\n /**\n\t * Returns the scale tick objects\n\t * @return {Tick[]}\n\t * @since 2.7\n\t */\n getTicks() {\n return this.ticks;\n }\n\n /**\n\t * @return {string[]}\n\t */\n getLabels() {\n const data = this.chart.data;\n return this.options.labels || (this.isHorizontal() ? data.xLabels : data.yLabels) || data.labels || [];\n }\n\n /**\n * @return {import('../types.js').LabelItem[]}\n */\n getLabelItems(chartArea = this.chart.chartArea) {\n const items = this._labelItems || (this._labelItems = this._computeLabelItems(chartArea));\n return items;\n }\n\n // When a new layout is created, reset the data limits cache\n beforeLayout() {\n this._cache = {};\n this._dataLimitsCached = false;\n }\n\n // These methods are ordered by lifecycle. Utilities then follow.\n // Any function defined here is inherited by all scale types.\n // Any function can be extended by the scale type\n\n beforeUpdate() {\n call(this.options.beforeUpdate, [this]);\n }\n\n /**\n\t * @param {number} maxWidth - the max width in pixels\n\t * @param {number} maxHeight - the max height in pixels\n\t * @param {{top: number, left: number, bottom: number, right: number}} margins - the space between the edge of the other scales and edge of the chart\n\t * This space comes from two sources:\n\t * - padding - space that's required to show the labels at the edges of the scale\n\t * - thickness of scales or legends in another orientation\n\t */\n update(maxWidth, maxHeight, margins) {\n const {beginAtZero, grace, ticks: tickOpts} = this.options;\n const sampleSize = tickOpts.sampleSize;\n\n // Update Lifecycle - Probably don't want to ever extend or overwrite this function ;)\n this.beforeUpdate();\n\n // Absorb the master measurements\n this.maxWidth = maxWidth;\n this.maxHeight = maxHeight;\n this._margins = margins = Object.assign({\n left: 0,\n right: 0,\n top: 0,\n bottom: 0\n }, margins);\n\n this.ticks = null;\n this._labelSizes = null;\n this._gridLineItems = null;\n this._labelItems = null;\n\n // Dimensions\n this.beforeSetDimensions();\n this.setDimensions();\n this.afterSetDimensions();\n\n this._maxLength = this.isHorizontal()\n ? this.width + margins.left + margins.right\n : this.height + margins.top + margins.bottom;\n\n // Data min/max\n if (!this._dataLimitsCached) {\n this.beforeDataLimits();\n this.determineDataLimits();\n this.afterDataLimits();\n this._range = _addGrace(this, grace, beginAtZero);\n this._dataLimitsCached = true;\n }\n\n this.beforeBuildTicks();\n\n this.ticks = this.buildTicks() || [];\n\n // Allow modification of ticks in callback.\n this.afterBuildTicks();\n\n // Compute tick rotation and fit using a sampled subset of labels\n // We generally don't need to compute the size of every single label for determining scale size\n const samplingEnabled = sampleSize < this.ticks.length;\n this._convertTicksToLabels(samplingEnabled ? sample(this.ticks, sampleSize) : this.ticks);\n\n // configure is called twice, once here, once from core.controller.updateLayout.\n // Here we haven't been positioned yet, but dimensions are correct.\n // Variables set in configure are needed for calculateLabelRotation, and\n // it's ok that coordinates are not correct there, only dimensions matter.\n this.configure();\n\n // Tick Rotation\n this.beforeCalculateLabelRotation();\n this.calculateLabelRotation(); // Preconditions: number of ticks and sizes of largest labels must be calculated beforehand\n this.afterCalculateLabelRotation();\n\n // Auto-skip\n if (tickOpts.display && (tickOpts.autoSkip || tickOpts.source === 'auto')) {\n this.ticks = autoSkip(this, this.ticks);\n this._labelSizes = null;\n this.afterAutoSkip();\n }\n\n if (samplingEnabled) {\n // Generate labels using all non-skipped ticks\n this._convertTicksToLabels(this.ticks);\n }\n\n this.beforeFit();\n this.fit(); // Preconditions: label rotation and label sizes must be calculated beforehand\n this.afterFit();\n\n // IMPORTANT: after this point, we consider that `this.ticks` will NEVER change!\n\n this.afterUpdate();\n }\n\n /**\n\t * @protected\n\t */\n configure() {\n let reversePixels = this.options.reverse;\n let startPixel, endPixel;\n\n if (this.isHorizontal()) {\n startPixel = this.left;\n endPixel = this.right;\n } else {\n startPixel = this.top;\n endPixel = this.bottom;\n // by default vertical scales are from bottom to top, so pixels are reversed\n reversePixels = !reversePixels;\n }\n this._startPixel = startPixel;\n this._endPixel = endPixel;\n this._reversePixels = reversePixels;\n this._length = endPixel - startPixel;\n this._alignToPixels = this.options.alignToPixels;\n }\n\n afterUpdate() {\n call(this.options.afterUpdate, [this]);\n }\n\n //\n\n beforeSetDimensions() {\n call(this.options.beforeSetDimensions, [this]);\n }\n setDimensions() {\n // Set the unconstrained dimension before label rotation\n if (this.isHorizontal()) {\n // Reset position before calculating rotation\n this.width = this.maxWidth;\n this.left = 0;\n this.right = this.width;\n } else {\n this.height = this.maxHeight;\n\n // Reset position before calculating rotation\n this.top = 0;\n this.bottom = this.height;\n }\n\n // Reset padding\n this.paddingLeft = 0;\n this.paddingTop = 0;\n this.paddingRight = 0;\n this.paddingBottom = 0;\n }\n afterSetDimensions() {\n call(this.options.afterSetDimensions, [this]);\n }\n\n _callHooks(name) {\n this.chart.notifyPlugins(name, this.getContext());\n call(this.options[name], [this]);\n }\n\n // Data limits\n beforeDataLimits() {\n this._callHooks('beforeDataLimits');\n }\n determineDataLimits() {}\n afterDataLimits() {\n this._callHooks('afterDataLimits');\n }\n\n //\n beforeBuildTicks() {\n this._callHooks('beforeBuildTicks');\n }\n /**\n\t * @return {object[]} the ticks\n\t */\n buildTicks() {\n return [];\n }\n afterBuildTicks() {\n this._callHooks('afterBuildTicks');\n }\n\n beforeTickToLabelConversion() {\n call(this.options.beforeTickToLabelConversion, [this]);\n }\n /**\n\t * Convert ticks to label strings\n\t * @param {Tick[]} ticks\n\t */\n generateTickLabels(ticks) {\n const tickOpts = this.options.ticks;\n let i, ilen, tick;\n for (i = 0, ilen = ticks.length; i < ilen; i++) {\n tick = ticks[i];\n tick.label = call(tickOpts.callback, [tick.value, i, ticks], this);\n }\n }\n afterTickToLabelConversion() {\n call(this.options.afterTickToLabelConversion, [this]);\n }\n\n //\n\n beforeCalculateLabelRotation() {\n call(this.options.beforeCalculateLabelRotation, [this]);\n }\n calculateLabelRotation() {\n const options = this.options;\n const tickOpts = options.ticks;\n const numTicks = getTicksLimit(this.ticks.length, options.ticks.maxTicksLimit);\n const minRotation = tickOpts.minRotation || 0;\n const maxRotation = tickOpts.maxRotation;\n let labelRotation = minRotation;\n let tickWidth, maxHeight, maxLabelDiagonal;\n\n if (!this._isVisible() || !tickOpts.display || minRotation >= maxRotation || numTicks <= 1 || !this.isHorizontal()) {\n this.labelRotation = minRotation;\n return;\n }\n\n const labelSizes = this._getLabelSizes();\n const maxLabelWidth = labelSizes.widest.width;\n const maxLabelHeight = labelSizes.highest.height;\n\n // Estimate the width of each grid based on the canvas width, the maximum\n // label width and the number of tick intervals\n const maxWidth = _limitValue(this.chart.width - maxLabelWidth, 0, this.maxWidth);\n tickWidth = options.offset ? this.maxWidth / numTicks : maxWidth / (numTicks - 1);\n\n // Allow 3 pixels x2 padding either side for label readability\n if (maxLabelWidth + 6 > tickWidth) {\n tickWidth = maxWidth / (numTicks - (options.offset ? 0.5 : 1));\n maxHeight = this.maxHeight - getTickMarkLength(options.grid)\n\t\t\t\t- tickOpts.padding - getTitleHeight(options.title, this.chart.options.font);\n maxLabelDiagonal = Math.sqrt(maxLabelWidth * maxLabelWidth + maxLabelHeight * maxLabelHeight);\n labelRotation = toDegrees(Math.min(\n Math.asin(_limitValue((labelSizes.highest.height + 6) / tickWidth, -1, 1)),\n Math.asin(_limitValue(maxHeight / maxLabelDiagonal, -1, 1)) - Math.asin(_limitValue(maxLabelHeight / maxLabelDiagonal, -1, 1))\n ));\n labelRotation = Math.max(minRotation, Math.min(maxRotation, labelRotation));\n }\n\n this.labelRotation = labelRotation;\n }\n afterCalculateLabelRotation() {\n call(this.options.afterCalculateLabelRotation, [this]);\n }\n afterAutoSkip() {}\n\n //\n\n beforeFit() {\n call(this.options.beforeFit, [this]);\n }\n fit() {\n // Reset\n const minSize = {\n width: 0,\n height: 0\n };\n\n const {chart, options: {ticks: tickOpts, title: titleOpts, grid: gridOpts}} = this;\n const display = this._isVisible();\n const isHorizontal = this.isHorizontal();\n\n if (display) {\n const titleHeight = getTitleHeight(titleOpts, chart.options.font);\n if (isHorizontal) {\n minSize.width = this.maxWidth;\n minSize.height = getTickMarkLength(gridOpts) + titleHeight;\n } else {\n minSize.height = this.maxHeight; // fill all the height\n minSize.width = getTickMarkLength(gridOpts) + titleHeight;\n }\n\n // Don't bother fitting the ticks if we are not showing the labels\n if (tickOpts.display && this.ticks.length) {\n const {first, last, widest, highest} = this._getLabelSizes();\n const tickPadding = tickOpts.padding * 2;\n const angleRadians = toRadians(this.labelRotation);\n const cos = Math.cos(angleRadians);\n const sin = Math.sin(angleRadians);\n\n if (isHorizontal) {\n // A horizontal axis is more constrained by the height.\n const labelHeight = tickOpts.mirror ? 0 : sin * widest.width + cos * highest.height;\n minSize.height = Math.min(this.maxHeight, minSize.height + labelHeight + tickPadding);\n } else {\n // A vertical axis is more constrained by the width. Labels are the\n // dominant factor here, so get that length first and account for padding\n const labelWidth = tickOpts.mirror ? 0 : cos * widest.width + sin * highest.height;\n\n minSize.width = Math.min(this.maxWidth, minSize.width + labelWidth + tickPadding);\n }\n this._calculatePadding(first, last, sin, cos);\n }\n }\n\n this._handleMargins();\n\n if (isHorizontal) {\n this.width = this._length = chart.width - this._margins.left - this._margins.right;\n this.height = minSize.height;\n } else {\n this.width = minSize.width;\n this.height = this._length = chart.height - this._margins.top - this._margins.bottom;\n }\n }\n\n _calculatePadding(first, last, sin, cos) {\n const {ticks: {align, padding}, position} = this.options;\n const isRotated = this.labelRotation !== 0;\n const labelsBelowTicks = position !== 'top' && this.axis === 'x';\n\n if (this.isHorizontal()) {\n const offsetLeft = this.getPixelForTick(0) - this.left;\n const offsetRight = this.right - this.getPixelForTick(this.ticks.length - 1);\n let paddingLeft = 0;\n let paddingRight = 0;\n\n // Ensure that our ticks are always inside the canvas. When rotated, ticks are right aligned\n // which means that the right padding is dominated by the font height\n if (isRotated) {\n if (labelsBelowTicks) {\n paddingLeft = cos * first.width;\n paddingRight = sin * last.height;\n } else {\n paddingLeft = sin * first.height;\n paddingRight = cos * last.width;\n }\n } else if (align === 'start') {\n paddingRight = last.width;\n } else if (align === 'end') {\n paddingLeft = first.width;\n } else if (align !== 'inner') {\n paddingLeft = first.width / 2;\n paddingRight = last.width / 2;\n }\n\n // Adjust padding taking into account changes in offsets\n this.paddingLeft = Math.max((paddingLeft - offsetLeft + padding) * this.width / (this.width - offsetLeft), 0);\n this.paddingRight = Math.max((paddingRight - offsetRight + padding) * this.width / (this.width - offsetRight), 0);\n } else {\n let paddingTop = last.height / 2;\n let paddingBottom = first.height / 2;\n\n if (align === 'start') {\n paddingTop = 0;\n paddingBottom = first.height;\n } else if (align === 'end') {\n paddingTop = last.height;\n paddingBottom = 0;\n }\n\n this.paddingTop = paddingTop + padding;\n this.paddingBottom = paddingBottom + padding;\n }\n }\n\n /**\n\t * Handle margins and padding interactions\n\t * @private\n\t */\n _handleMargins() {\n if (this._margins) {\n this._margins.left = Math.max(this.paddingLeft, this._margins.left);\n this._margins.top = Math.max(this.paddingTop, this._margins.top);\n this._margins.right = Math.max(this.paddingRight, this._margins.right);\n this._margins.bottom = Math.max(this.paddingBottom, this._margins.bottom);\n }\n }\n\n afterFit() {\n call(this.options.afterFit, [this]);\n }\n\n // Shared Methods\n /**\n\t * @return {boolean}\n\t */\n isHorizontal() {\n const {axis, position} = this.options;\n return position === 'top' || position === 'bottom' || axis === 'x';\n }\n /**\n\t * @return {boolean}\n\t */\n isFullSize() {\n return this.options.fullSize;\n }\n\n /**\n\t * @param {Tick[]} ticks\n\t * @private\n\t */\n _convertTicksToLabels(ticks) {\n this.beforeTickToLabelConversion();\n\n this.generateTickLabels(ticks);\n\n // Ticks should be skipped when callback returns null or undef, so lets remove those.\n let i, ilen;\n for (i = 0, ilen = ticks.length; i < ilen; i++) {\n if (isNullOrUndef(ticks[i].label)) {\n ticks.splice(i, 1);\n ilen--;\n i--;\n }\n }\n\n this.afterTickToLabelConversion();\n }\n\n /**\n\t * @return {{ first: object, last: object, widest: object, highest: object, widths: Array, heights: array }}\n\t * @private\n\t */\n _getLabelSizes() {\n let labelSizes = this._labelSizes;\n\n if (!labelSizes) {\n const sampleSize = this.options.ticks.sampleSize;\n let ticks = this.ticks;\n if (sampleSize < ticks.length) {\n ticks = sample(ticks, sampleSize);\n }\n\n this._labelSizes = labelSizes = this._computeLabelSizes(ticks, ticks.length, this.options.ticks.maxTicksLimit);\n }\n\n return labelSizes;\n }\n\n /**\n\t * Returns {width, height, offset} objects for the first, last, widest, highest tick\n\t * labels where offset indicates the anchor point offset from the top in pixels.\n\t * @return {{ first: object, last: object, widest: object, highest: object, widths: Array, heights: array }}\n\t * @private\n\t */\n _computeLabelSizes(ticks, length, maxTicksLimit) {\n const {ctx, _longestTextCache: caches} = this;\n const widths = [];\n const heights = [];\n const increment = Math.floor(length / getTicksLimit(length, maxTicksLimit));\n let widestLabelSize = 0;\n let highestLabelSize = 0;\n let i, j, jlen, label, tickFont, fontString, cache, lineHeight, width, height, nestedLabel;\n\n for (i = 0; i < length; i += increment) {\n label = ticks[i].label;\n tickFont = this._resolveTickFontOptions(i);\n ctx.font = fontString = tickFont.string;\n cache = caches[fontString] = caches[fontString] || {data: {}, gc: []};\n lineHeight = tickFont.lineHeight;\n width = height = 0;\n // Undefined labels and arrays should not be measured\n if (!isNullOrUndef(label) && !isArray(label)) {\n width = _measureText(ctx, cache.data, cache.gc, width, label);\n height = lineHeight;\n } else if (isArray(label)) {\n // if it is an array let's measure each element\n for (j = 0, jlen = label.length; j < jlen; ++j) {\n nestedLabel = /** @type {string} */ (label[j]);\n // Undefined labels and arrays should not be measured\n if (!isNullOrUndef(nestedLabel) && !isArray(nestedLabel)) {\n width = _measureText(ctx, cache.data, cache.gc, width, nestedLabel);\n height += lineHeight;\n }\n }\n }\n widths.push(width);\n heights.push(height);\n widestLabelSize = Math.max(width, widestLabelSize);\n highestLabelSize = Math.max(height, highestLabelSize);\n }\n garbageCollect(caches, length);\n\n const widest = widths.indexOf(widestLabelSize);\n const highest = heights.indexOf(highestLabelSize);\n\n const valueAt = (idx) => ({width: widths[idx] || 0, height: heights[idx] || 0});\n\n return {\n first: valueAt(0),\n last: valueAt(length - 1),\n widest: valueAt(widest),\n highest: valueAt(highest),\n widths,\n heights,\n };\n }\n\n /**\n\t * Used to get the label to display in the tooltip for the given value\n\t * @param {*} value\n\t * @return {string}\n\t */\n getLabelForValue(value) {\n return value;\n }\n\n /**\n\t * Returns the location of the given data point. Value can either be an index or a numerical value\n\t * The coordinate (0, 0) is at the upper-left corner of the canvas\n\t * @param {*} value\n\t * @param {number} [index]\n\t * @return {number}\n\t */\n getPixelForValue(value, index) { // eslint-disable-line no-unused-vars\n return NaN;\n }\n\n /**\n\t * Used to get the data value from a given pixel. This is the inverse of getPixelForValue\n\t * The coordinate (0, 0) is at the upper-left corner of the canvas\n\t * @param {number} pixel\n\t * @return {*}\n\t */\n getValueForPixel(pixel) {} // eslint-disable-line no-unused-vars\n\n /**\n\t * Returns the location of the tick at the given index\n\t * The coordinate (0, 0) is at the upper-left corner of the canvas\n\t * @param {number} index\n\t * @return {number}\n\t */\n getPixelForTick(index) {\n const ticks = this.ticks;\n if (index < 0 || index > ticks.length - 1) {\n return null;\n }\n return this.getPixelForValue(ticks[index].value);\n }\n\n /**\n\t * Utility for getting the pixel location of a percentage of scale\n\t * The coordinate (0, 0) is at the upper-left corner of the canvas\n\t * @param {number} decimal\n\t * @return {number}\n\t */\n getPixelForDecimal(decimal) {\n if (this._reversePixels) {\n decimal = 1 - decimal;\n }\n\n const pixel = this._startPixel + decimal * this._length;\n return _int16Range(this._alignToPixels ? _alignPixel(this.chart, pixel, 0) : pixel);\n }\n\n /**\n\t * @param {number} pixel\n\t * @return {number}\n\t */\n getDecimalForPixel(pixel) {\n const decimal = (pixel - this._startPixel) / this._length;\n return this._reversePixels ? 1 - decimal : decimal;\n }\n\n /**\n\t * Returns the pixel for the minimum chart value\n\t * The coordinate (0, 0) is at the upper-left corner of the canvas\n\t * @return {number}\n\t */\n getBasePixel() {\n return this.getPixelForValue(this.getBaseValue());\n }\n\n /**\n\t * @return {number}\n\t */\n getBaseValue() {\n const {min, max} = this;\n\n return min < 0 && max < 0 ? max :\n min > 0 && max > 0 ? min :\n 0;\n }\n\n /**\n\t * @protected\n\t */\n getContext(index) {\n const ticks = this.ticks || [];\n\n if (index >= 0 && index < ticks.length) {\n const tick = ticks[index];\n return tick.$context ||\n\t\t\t\t(tick.$context = createTickContext(this.getContext(), index, tick));\n }\n return this.$context ||\n\t\t\t(this.$context = createScaleContext(this.chart.getContext(), this));\n }\n\n /**\n\t * @return {number}\n\t * @private\n\t */\n _tickSize() {\n const optionTicks = this.options.ticks;\n\n // Calculate space needed by label in axis direction.\n const rot = toRadians(this.labelRotation);\n const cos = Math.abs(Math.cos(rot));\n const sin = Math.abs(Math.sin(rot));\n\n const labelSizes = this._getLabelSizes();\n const padding = optionTicks.autoSkipPadding || 0;\n const w = labelSizes ? labelSizes.widest.width + padding : 0;\n const h = labelSizes ? labelSizes.highest.height + padding : 0;\n\n // Calculate space needed for 1 tick in axis direction.\n return this.isHorizontal()\n ? h * cos > w * sin ? w / cos : h / sin\n : h * sin < w * cos ? h / cos : w / sin;\n }\n\n /**\n\t * @return {boolean}\n\t * @private\n\t */\n _isVisible() {\n const display = this.options.display;\n\n if (display !== 'auto') {\n return !!display;\n }\n\n return this.getMatchingVisibleMetas().length > 0;\n }\n\n /**\n\t * @private\n\t */\n _computeGridLineItems(chartArea) {\n const axis = this.axis;\n const chart = this.chart;\n const options = this.options;\n const {grid, position, border} = options;\n const offset = grid.offset;\n const isHorizontal = this.isHorizontal();\n const ticks = this.ticks;\n const ticksLength = ticks.length + (offset ? 1 : 0);\n const tl = getTickMarkLength(grid);\n const items = [];\n\n const borderOpts = border.setContext(this.getContext());\n const axisWidth = borderOpts.display ? borderOpts.width : 0;\n const axisHalfWidth = axisWidth / 2;\n const alignBorderValue = function(pixel) {\n return _alignPixel(chart, pixel, axisWidth);\n };\n let borderValue, i, lineValue, alignedLineValue;\n let tx1, ty1, tx2, ty2, x1, y1, x2, y2;\n\n if (position === 'top') {\n borderValue = alignBorderValue(this.bottom);\n ty1 = this.bottom - tl;\n ty2 = borderValue - axisHalfWidth;\n y1 = alignBorderValue(chartArea.top) + axisHalfWidth;\n y2 = chartArea.bottom;\n } else if (position === 'bottom') {\n borderValue = alignBorderValue(this.top);\n y1 = chartArea.top;\n y2 = alignBorderValue(chartArea.bottom) - axisHalfWidth;\n ty1 = borderValue + axisHalfWidth;\n ty2 = this.top + tl;\n } else if (position === 'left') {\n borderValue = alignBorderValue(this.right);\n tx1 = this.right - tl;\n tx2 = borderValue - axisHalfWidth;\n x1 = alignBorderValue(chartArea.left) + axisHalfWidth;\n x2 = chartArea.right;\n } else if (position === 'right') {\n borderValue = alignBorderValue(this.left);\n x1 = chartArea.left;\n x2 = alignBorderValue(chartArea.right) - axisHalfWidth;\n tx1 = borderValue + axisHalfWidth;\n tx2 = this.left + tl;\n } else if (axis === 'x') {\n if (position === 'center') {\n borderValue = alignBorderValue((chartArea.top + chartArea.bottom) / 2 + 0.5);\n } else if (isObject(position)) {\n const positionAxisID = Object.keys(position)[0];\n const value = position[positionAxisID];\n borderValue = alignBorderValue(this.chart.scales[positionAxisID].getPixelForValue(value));\n }\n\n y1 = chartArea.top;\n y2 = chartArea.bottom;\n ty1 = borderValue + axisHalfWidth;\n ty2 = ty1 + tl;\n } else if (axis === 'y') {\n if (position === 'center') {\n borderValue = alignBorderValue((chartArea.left + chartArea.right) / 2);\n } else if (isObject(position)) {\n const positionAxisID = Object.keys(position)[0];\n const value = position[positionAxisID];\n borderValue = alignBorderValue(this.chart.scales[positionAxisID].getPixelForValue(value));\n }\n\n tx1 = borderValue - axisHalfWidth;\n tx2 = tx1 - tl;\n x1 = chartArea.left;\n x2 = chartArea.right;\n }\n\n const limit = valueOrDefault(options.ticks.maxTicksLimit, ticksLength);\n const step = Math.max(1, Math.ceil(ticksLength / limit));\n for (i = 0; i < ticksLength; i += step) {\n const context = this.getContext(i);\n const optsAtIndex = grid.setContext(context);\n const optsAtIndexBorder = border.setContext(context);\n\n const lineWidth = optsAtIndex.lineWidth;\n const lineColor = optsAtIndex.color;\n const borderDash = optsAtIndexBorder.dash || [];\n const borderDashOffset = optsAtIndexBorder.dashOffset;\n\n const tickWidth = optsAtIndex.tickWidth;\n const tickColor = optsAtIndex.tickColor;\n const tickBorderDash = optsAtIndex.tickBorderDash || [];\n const tickBorderDashOffset = optsAtIndex.tickBorderDashOffset;\n\n lineValue = getPixelForGridLine(this, i, offset);\n\n // Skip if the pixel is out of the range\n if (lineValue === undefined) {\n continue;\n }\n\n alignedLineValue = _alignPixel(chart, lineValue, lineWidth);\n\n if (isHorizontal) {\n tx1 = tx2 = x1 = x2 = alignedLineValue;\n } else {\n ty1 = ty2 = y1 = y2 = alignedLineValue;\n }\n\n items.push({\n tx1,\n ty1,\n tx2,\n ty2,\n x1,\n y1,\n x2,\n y2,\n width: lineWidth,\n color: lineColor,\n borderDash,\n borderDashOffset,\n tickWidth,\n tickColor,\n tickBorderDash,\n tickBorderDashOffset,\n });\n }\n\n this._ticksLength = ticksLength;\n this._borderValue = borderValue;\n\n return items;\n }\n\n /**\n\t * @private\n\t */\n _computeLabelItems(chartArea) {\n const axis = this.axis;\n const options = this.options;\n const {position, ticks: optionTicks} = options;\n const isHorizontal = this.isHorizontal();\n const ticks = this.ticks;\n const {align, crossAlign, padding, mirror} = optionTicks;\n const tl = getTickMarkLength(options.grid);\n const tickAndPadding = tl + padding;\n const hTickAndPadding = mirror ? -padding : tickAndPadding;\n const rotation = -toRadians(this.labelRotation);\n const items = [];\n let i, ilen, tick, label, x, y, textAlign, pixel, font, lineHeight, lineCount, textOffset;\n let textBaseline = 'middle';\n\n if (position === 'top') {\n y = this.bottom - hTickAndPadding;\n textAlign = this._getXAxisLabelAlignment();\n } else if (position === 'bottom') {\n y = this.top + hTickAndPadding;\n textAlign = this._getXAxisLabelAlignment();\n } else if (position === 'left') {\n const ret = this._getYAxisLabelAlignment(tl);\n textAlign = ret.textAlign;\n x = ret.x;\n } else if (position === 'right') {\n const ret = this._getYAxisLabelAlignment(tl);\n textAlign = ret.textAlign;\n x = ret.x;\n } else if (axis === 'x') {\n if (position === 'center') {\n y = ((chartArea.top + chartArea.bottom) / 2) + tickAndPadding;\n } else if (isObject(position)) {\n const positionAxisID = Object.keys(position)[0];\n const value = position[positionAxisID];\n y = this.chart.scales[positionAxisID].getPixelForValue(value) + tickAndPadding;\n }\n textAlign = this._getXAxisLabelAlignment();\n } else if (axis === 'y') {\n if (position === 'center') {\n x = ((chartArea.left + chartArea.right) / 2) - tickAndPadding;\n } else if (isObject(position)) {\n const positionAxisID = Object.keys(position)[0];\n const value = position[positionAxisID];\n x = this.chart.scales[positionAxisID].getPixelForValue(value);\n }\n textAlign = this._getYAxisLabelAlignment(tl).textAlign;\n }\n\n if (axis === 'y') {\n if (align === 'start') {\n textBaseline = 'top';\n } else if (align === 'end') {\n textBaseline = 'bottom';\n }\n }\n\n const labelSizes = this._getLabelSizes();\n for (i = 0, ilen = ticks.length; i < ilen; ++i) {\n tick = ticks[i];\n label = tick.label;\n\n const optsAtIndex = optionTicks.setContext(this.getContext(i));\n pixel = this.getPixelForTick(i) + optionTicks.labelOffset;\n font = this._resolveTickFontOptions(i);\n lineHeight = font.lineHeight;\n lineCount = isArray(label) ? label.length : 1;\n const halfCount = lineCount / 2;\n const color = optsAtIndex.color;\n const strokeColor = optsAtIndex.textStrokeColor;\n const strokeWidth = optsAtIndex.textStrokeWidth;\n let tickTextAlign = textAlign;\n\n if (isHorizontal) {\n x = pixel;\n\n if (textAlign === 'inner') {\n if (i === ilen - 1) {\n tickTextAlign = !this.options.reverse ? 'right' : 'left';\n } else if (i === 0) {\n tickTextAlign = !this.options.reverse ? 'left' : 'right';\n } else {\n tickTextAlign = 'center';\n }\n }\n\n if (position === 'top') {\n if (crossAlign === 'near' || rotation !== 0) {\n textOffset = -lineCount * lineHeight + lineHeight / 2;\n } else if (crossAlign === 'center') {\n textOffset = -labelSizes.highest.height / 2 - halfCount * lineHeight + lineHeight;\n } else {\n textOffset = -labelSizes.highest.height + lineHeight / 2;\n }\n } else {\n // eslint-disable-next-line no-lonely-if\n if (crossAlign === 'near' || rotation !== 0) {\n textOffset = lineHeight / 2;\n } else if (crossAlign === 'center') {\n textOffset = labelSizes.highest.height / 2 - halfCount * lineHeight;\n } else {\n textOffset = labelSizes.highest.height - lineCount * lineHeight;\n }\n }\n if (mirror) {\n textOffset *= -1;\n }\n if (rotation !== 0 && !optsAtIndex.showLabelBackdrop) {\n x += (lineHeight / 2) * Math.sin(rotation);\n }\n } else {\n y = pixel;\n textOffset = (1 - lineCount) * lineHeight / 2;\n }\n\n let backdrop;\n\n if (optsAtIndex.showLabelBackdrop) {\n const labelPadding = toPadding(optsAtIndex.backdropPadding);\n const height = labelSizes.heights[i];\n const width = labelSizes.widths[i];\n\n let top = textOffset - labelPadding.top;\n let left = 0 - labelPadding.left;\n\n switch (textBaseline) {\n case 'middle':\n top -= height / 2;\n break;\n case 'bottom':\n top -= height;\n break;\n default:\n break;\n }\n\n switch (textAlign) {\n case 'center':\n left -= width / 2;\n break;\n case 'right':\n left -= width;\n break;\n default:\n break;\n }\n\n backdrop = {\n left,\n top,\n width: width + labelPadding.width,\n height: height + labelPadding.height,\n\n color: optsAtIndex.backdropColor,\n };\n }\n\n items.push({\n label,\n font,\n textOffset,\n options: {\n rotation,\n color,\n strokeColor,\n strokeWidth,\n textAlign: tickTextAlign,\n textBaseline,\n translation: [x, y],\n backdrop,\n }\n });\n }\n\n return items;\n }\n\n _getXAxisLabelAlignment() {\n const {position, ticks} = this.options;\n const rotation = -toRadians(this.labelRotation);\n\n if (rotation) {\n return position === 'top' ? 'left' : 'right';\n }\n\n let align = 'center';\n\n if (ticks.align === 'start') {\n align = 'left';\n } else if (ticks.align === 'end') {\n align = 'right';\n } else if (ticks.align === 'inner') {\n align = 'inner';\n }\n\n return align;\n }\n\n _getYAxisLabelAlignment(tl) {\n const {position, ticks: {crossAlign, mirror, padding}} = this.options;\n const labelSizes = this._getLabelSizes();\n const tickAndPadding = tl + padding;\n const widest = labelSizes.widest.width;\n\n let textAlign;\n let x;\n\n if (position === 'left') {\n if (mirror) {\n x = this.right + padding;\n\n if (crossAlign === 'near') {\n textAlign = 'left';\n } else if (crossAlign === 'center') {\n textAlign = 'center';\n x += (widest / 2);\n } else {\n textAlign = 'right';\n x += widest;\n }\n } else {\n x = this.right - tickAndPadding;\n\n if (crossAlign === 'near') {\n textAlign = 'right';\n } else if (crossAlign === 'center') {\n textAlign = 'center';\n x -= (widest / 2);\n } else {\n textAlign = 'left';\n x = this.left;\n }\n }\n } else if (position === 'right') {\n if (mirror) {\n x = this.left + padding;\n\n if (crossAlign === 'near') {\n textAlign = 'right';\n } else if (crossAlign === 'center') {\n textAlign = 'center';\n x -= (widest / 2);\n } else {\n textAlign = 'left';\n x -= widest;\n }\n } else {\n x = this.left + tickAndPadding;\n\n if (crossAlign === 'near') {\n textAlign = 'left';\n } else if (crossAlign === 'center') {\n textAlign = 'center';\n x += widest / 2;\n } else {\n textAlign = 'right';\n x = this.right;\n }\n }\n } else {\n textAlign = 'right';\n }\n\n return {textAlign, x};\n }\n\n /**\n\t * @private\n\t */\n _computeLabelArea() {\n if (this.options.ticks.mirror) {\n return;\n }\n\n const chart = this.chart;\n const position = this.options.position;\n\n if (position === 'left' || position === 'right') {\n return {top: 0, left: this.left, bottom: chart.height, right: this.right};\n } if (position === 'top' || position === 'bottom') {\n return {top: this.top, left: 0, bottom: this.bottom, right: chart.width};\n }\n }\n\n /**\n * @protected\n */\n drawBackground() {\n const {ctx, options: {backgroundColor}, left, top, width, height} = this;\n if (backgroundColor) {\n ctx.save();\n ctx.fillStyle = backgroundColor;\n ctx.fillRect(left, top, width, height);\n ctx.restore();\n }\n }\n\n getLineWidthForValue(value) {\n const grid = this.options.grid;\n if (!this._isVisible() || !grid.display) {\n return 0;\n }\n const ticks = this.ticks;\n const index = ticks.findIndex(t => t.value === value);\n if (index >= 0) {\n const opts = grid.setContext(this.getContext(index));\n return opts.lineWidth;\n }\n return 0;\n }\n\n /**\n\t * @protected\n\t */\n drawGrid(chartArea) {\n const grid = this.options.grid;\n const ctx = this.ctx;\n const items = this._gridLineItems || (this._gridLineItems = this._computeGridLineItems(chartArea));\n let i, ilen;\n\n const drawLine = (p1, p2, style) => {\n if (!style.width || !style.color) {\n return;\n }\n ctx.save();\n ctx.lineWidth = style.width;\n ctx.strokeStyle = style.color;\n ctx.setLineDash(style.borderDash || []);\n ctx.lineDashOffset = style.borderDashOffset;\n\n ctx.beginPath();\n ctx.moveTo(p1.x, p1.y);\n ctx.lineTo(p2.x, p2.y);\n ctx.stroke();\n ctx.restore();\n };\n\n if (grid.display) {\n for (i = 0, ilen = items.length; i < ilen; ++i) {\n const item = items[i];\n\n if (grid.drawOnChartArea) {\n drawLine(\n {x: item.x1, y: item.y1},\n {x: item.x2, y: item.y2},\n item\n );\n }\n\n if (grid.drawTicks) {\n drawLine(\n {x: item.tx1, y: item.ty1},\n {x: item.tx2, y: item.ty2},\n {\n color: item.tickColor,\n width: item.tickWidth,\n borderDash: item.tickBorderDash,\n borderDashOffset: item.tickBorderDashOffset\n }\n );\n }\n }\n }\n }\n\n /**\n\t * @protected\n\t */\n drawBorder() {\n const {chart, ctx, options: {border, grid}} = this;\n const borderOpts = border.setContext(this.getContext());\n const axisWidth = border.display ? borderOpts.width : 0;\n if (!axisWidth) {\n return;\n }\n const lastLineWidth = grid.setContext(this.getContext(0)).lineWidth;\n const borderValue = this._borderValue;\n let x1, x2, y1, y2;\n\n if (this.isHorizontal()) {\n x1 = _alignPixel(chart, this.left, axisWidth) - axisWidth / 2;\n x2 = _alignPixel(chart, this.right, lastLineWidth) + lastLineWidth / 2;\n y1 = y2 = borderValue;\n } else {\n y1 = _alignPixel(chart, this.top, axisWidth) - axisWidth / 2;\n y2 = _alignPixel(chart, this.bottom, lastLineWidth) + lastLineWidth / 2;\n x1 = x2 = borderValue;\n }\n ctx.save();\n ctx.lineWidth = borderOpts.width;\n ctx.strokeStyle = borderOpts.color;\n\n ctx.beginPath();\n ctx.moveTo(x1, y1);\n ctx.lineTo(x2, y2);\n ctx.stroke();\n\n ctx.restore();\n }\n\n /**\n\t * @protected\n\t */\n drawLabels(chartArea) {\n const optionTicks = this.options.ticks;\n\n if (!optionTicks.display) {\n return;\n }\n\n const ctx = this.ctx;\n\n const area = this._computeLabelArea();\n if (area) {\n clipArea(ctx, area);\n }\n\n const items = this.getLabelItems(chartArea);\n for (const item of items) {\n const renderTextOptions = item.options;\n const tickFont = item.font;\n const label = item.label;\n const y = item.textOffset;\n renderText(ctx, label, 0, y, tickFont, renderTextOptions);\n }\n\n if (area) {\n unclipArea(ctx);\n }\n }\n\n /**\n\t * @protected\n\t */\n drawTitle() {\n const {ctx, options: {position, title, reverse}} = this;\n\n if (!title.display) {\n return;\n }\n\n const font = toFont(title.font);\n const padding = toPadding(title.padding);\n const align = title.align;\n let offset = font.lineHeight / 2;\n\n if (position === 'bottom' || position === 'center' || isObject(position)) {\n offset += padding.bottom;\n if (isArray(title.text)) {\n offset += font.lineHeight * (title.text.length - 1);\n }\n } else {\n offset += padding.top;\n }\n\n const {titleX, titleY, maxWidth, rotation} = titleArgs(this, offset, position, align);\n\n renderText(ctx, title.text, 0, 0, font, {\n color: title.color,\n maxWidth,\n rotation,\n textAlign: titleAlign(align, position, reverse),\n textBaseline: 'middle',\n translation: [titleX, titleY],\n });\n }\n\n draw(chartArea) {\n if (!this._isVisible()) {\n return;\n }\n\n this.drawBackground();\n this.drawGrid(chartArea);\n this.drawBorder();\n this.drawTitle();\n this.drawLabels(chartArea);\n }\n\n /**\n\t * @return {object[]}\n\t * @private\n\t */\n _layers() {\n const opts = this.options;\n const tz = opts.ticks && opts.ticks.z || 0;\n const gz = valueOrDefault(opts.grid && opts.grid.z, -1);\n const bz = valueOrDefault(opts.border && opts.border.z, 0);\n\n if (!this._isVisible() || this.draw !== Scale.prototype.draw) {\n // backward compatibility: draw has been overridden by custom scale\n return [{\n z: tz,\n draw: (chartArea) => {\n this.draw(chartArea);\n }\n }];\n }\n\n return [{\n z: gz,\n draw: (chartArea) => {\n this.drawBackground();\n this.drawGrid(chartArea);\n this.drawTitle();\n }\n }, {\n z: bz,\n draw: () => {\n this.drawBorder();\n }\n }, {\n z: tz,\n draw: (chartArea) => {\n this.drawLabels(chartArea);\n }\n }];\n }\n\n /**\n\t * Returns visible dataset metas that are attached to this scale\n\t * @param {string} [type] - if specified, also filter by dataset type\n\t * @return {object[]}\n\t */\n getMatchingVisibleMetas(type) {\n const metas = this.chart.getSortedVisibleDatasetMetas();\n const axisID = this.axis + 'AxisID';\n const result = [];\n let i, ilen;\n\n for (i = 0, ilen = metas.length; i < ilen; ++i) {\n const meta = metas[i];\n if (meta[axisID] === this.id && (!type || meta.type === type)) {\n result.push(meta);\n }\n }\n return result;\n }\n\n /**\n\t * @param {number} index\n\t * @return {object}\n\t * @protected\n \t */\n _resolveTickFontOptions(index) {\n const opts = this.options.ticks.setContext(this.getContext(index));\n return toFont(opts.font);\n }\n\n /**\n * @protected\n */\n _maxDigits() {\n const fontSize = this._resolveTickFontOptions(0).lineHeight;\n return (this.isHorizontal() ? this.width : this.height) / fontSize;\n }\n}\n","import {merge} from '../helpers/index.js';\nimport defaults, {overrides} from './core.defaults.js';\n\n/**\n * @typedef {{id: string, defaults: any, overrides?: any, defaultRoutes: any}} IChartComponent\n */\n\nexport default class TypedRegistry {\n constructor(type, scope, override) {\n this.type = type;\n this.scope = scope;\n this.override = override;\n this.items = Object.create(null);\n }\n\n isForType(type) {\n return Object.prototype.isPrototypeOf.call(this.type.prototype, type.prototype);\n }\n\n /**\n\t * @param {IChartComponent} item\n\t * @returns {string} The scope where items defaults were registered to.\n\t */\n register(item) {\n const proto = Object.getPrototypeOf(item);\n let parentScope;\n\n if (isIChartComponent(proto)) {\n // Make sure the parent is registered and note the scope where its defaults are.\n parentScope = this.register(proto);\n }\n\n const items = this.items;\n const id = item.id;\n const scope = this.scope + '.' + id;\n\n if (!id) {\n throw new Error('class does not have id: ' + item);\n }\n\n if (id in items) {\n // already registered\n return scope;\n }\n\n items[id] = item;\n registerDefaults(item, scope, parentScope);\n if (this.override) {\n defaults.override(item.id, item.overrides);\n }\n\n return scope;\n }\n\n /**\n\t * @param {string} id\n\t * @returns {object?}\n\t */\n get(id) {\n return this.items[id];\n }\n\n /**\n\t * @param {IChartComponent} item\n\t */\n unregister(item) {\n const items = this.items;\n const id = item.id;\n const scope = this.scope;\n\n if (id in items) {\n delete items[id];\n }\n\n if (scope && id in defaults[scope]) {\n delete defaults[scope][id];\n if (this.override) {\n delete overrides[id];\n }\n }\n }\n}\n\nfunction registerDefaults(item, scope, parentScope) {\n // Inherit the parent's defaults and keep existing defaults\n const itemDefaults = merge(Object.create(null), [\n parentScope ? defaults.get(parentScope) : {},\n defaults.get(scope),\n item.defaults\n ]);\n\n defaults.set(scope, itemDefaults);\n\n if (item.defaultRoutes) {\n routeDefaults(scope, item.defaultRoutes);\n }\n\n if (item.descriptors) {\n defaults.describe(scope, item.descriptors);\n }\n}\n\nfunction routeDefaults(scope, routes) {\n Object.keys(routes).forEach(property => {\n const propertyParts = property.split('.');\n const sourceName = propertyParts.pop();\n const sourceScope = [scope].concat(propertyParts).join('.');\n const parts = routes[property].split('.');\n const targetName = parts.pop();\n const targetScope = parts.join('.');\n defaults.route(sourceScope, sourceName, targetScope, targetName);\n });\n}\n\nfunction isIChartComponent(proto) {\n return 'id' in proto && 'defaults' in proto;\n}\n","import DatasetController from './core.datasetController.js';\nimport Element from './core.element.js';\nimport Scale from './core.scale.js';\nimport TypedRegistry from './core.typedRegistry.js';\nimport {each, callback as call, _capitalize} from '../helpers/helpers.core.js';\n\n/**\n * Please use the module's default export which provides a singleton instance\n * Note: class is exported for typedoc\n */\nexport class Registry {\n constructor() {\n this.controllers = new TypedRegistry(DatasetController, 'datasets', true);\n this.elements = new TypedRegistry(Element, 'elements');\n this.plugins = new TypedRegistry(Object, 'plugins');\n this.scales = new TypedRegistry(Scale, 'scales');\n // Order is important, Scale has Element in prototype chain,\n // so Scales must be before Elements. Plugins are a fallback, so not listed here.\n this._typedRegistries = [this.controllers, this.scales, this.elements];\n }\n\n /**\n\t * @param {...any} args\n\t */\n add(...args) {\n this._each('register', args);\n }\n\n remove(...args) {\n this._each('unregister', args);\n }\n\n /**\n\t * @param {...typeof DatasetController} args\n\t */\n addControllers(...args) {\n this._each('register', args, this.controllers);\n }\n\n /**\n\t * @param {...typeof Element} args\n\t */\n addElements(...args) {\n this._each('register', args, this.elements);\n }\n\n /**\n\t * @param {...any} args\n\t */\n addPlugins(...args) {\n this._each('register', args, this.plugins);\n }\n\n /**\n\t * @param {...typeof Scale} args\n\t */\n addScales(...args) {\n this._each('register', args, this.scales);\n }\n\n /**\n\t * @param {string} id\n\t * @returns {typeof DatasetController}\n\t */\n getController(id) {\n return this._get(id, this.controllers, 'controller');\n }\n\n /**\n\t * @param {string} id\n\t * @returns {typeof Element}\n\t */\n getElement(id) {\n return this._get(id, this.elements, 'element');\n }\n\n /**\n\t * @param {string} id\n\t * @returns {object}\n\t */\n getPlugin(id) {\n return this._get(id, this.plugins, 'plugin');\n }\n\n /**\n\t * @param {string} id\n\t * @returns {typeof Scale}\n\t */\n getScale(id) {\n return this._get(id, this.scales, 'scale');\n }\n\n /**\n\t * @param {...typeof DatasetController} args\n\t */\n removeControllers(...args) {\n this._each('unregister', args, this.controllers);\n }\n\n /**\n\t * @param {...typeof Element} args\n\t */\n removeElements(...args) {\n this._each('unregister', args, this.elements);\n }\n\n /**\n\t * @param {...any} args\n\t */\n removePlugins(...args) {\n this._each('unregister', args, this.plugins);\n }\n\n /**\n\t * @param {...typeof Scale} args\n\t */\n removeScales(...args) {\n this._each('unregister', args, this.scales);\n }\n\n /**\n\t * @private\n\t */\n _each(method, args, typedRegistry) {\n [...args].forEach(arg => {\n const reg = typedRegistry || this._getRegistryForType(arg);\n if (typedRegistry || reg.isForType(arg) || (reg === this.plugins && arg.id)) {\n this._exec(method, reg, arg);\n } else {\n // Handle loopable args\n // Use case:\n // import * as plugins from './plugins.js';\n // Chart.register(plugins);\n each(arg, item => {\n // If there are mixed types in the loopable, make sure those are\n // registered in correct registry\n // Use case: (treemap exporting controller, elements etc)\n // import * as treemap from 'chartjs-chart-treemap.js';\n // Chart.register(treemap);\n\n const itemReg = typedRegistry || this._getRegistryForType(item);\n this._exec(method, itemReg, item);\n });\n }\n });\n }\n\n /**\n\t * @private\n\t */\n _exec(method, registry, component) {\n const camelMethod = _capitalize(method);\n call(component['before' + camelMethod], [], component); // beforeRegister / beforeUnregister\n registry[method](component);\n call(component['after' + camelMethod], [], component); // afterRegister / afterUnregister\n }\n\n /**\n\t * @private\n\t */\n _getRegistryForType(type) {\n for (let i = 0; i < this._typedRegistries.length; i++) {\n const reg = this._typedRegistries[i];\n if (reg.isForType(type)) {\n return reg;\n }\n }\n // plugins is the fallback registry\n return this.plugins;\n }\n\n /**\n\t * @private\n\t */\n _get(id, typedRegistry, type) {\n const item = typedRegistry.get(id);\n if (item === undefined) {\n throw new Error('\"' + id + '\" is not a registered ' + type + '.');\n }\n return item;\n }\n\n}\n\n// singleton instance\nexport default /* #__PURE__ */ new Registry();\n","import registry from './core.registry.js';\nimport {callback as callCallback, isNullOrUndef, valueOrDefault} from '../helpers/helpers.core.js';\n\n/**\n * @typedef { import('./core.controller.js').default } Chart\n * @typedef { import('../types/index.js').ChartEvent } ChartEvent\n * @typedef { import('../plugins/plugin.tooltip.js').default } Tooltip\n */\n\n/**\n * @callback filterCallback\n * @param {{plugin: object, options: object}} value\n * @param {number} [index]\n * @param {array} [array]\n * @param {object} [thisArg]\n * @return {boolean}\n */\n\n\nexport default class PluginService {\n constructor() {\n this._init = [];\n }\n\n /**\n\t * Calls enabled plugins for `chart` on the specified hook and with the given args.\n\t * This method immediately returns as soon as a plugin explicitly returns false. The\n\t * returned value can be used, for instance, to interrupt the current action.\n\t * @param {Chart} chart - The chart instance for which plugins should be called.\n\t * @param {string} hook - The name of the plugin method to call (e.g. 'beforeUpdate').\n\t * @param {object} [args] - Extra arguments to apply to the hook call.\n * @param {filterCallback} [filter] - Filtering function for limiting which plugins are notified\n\t * @returns {boolean} false if any of the plugins return false, else returns true.\n\t */\n notify(chart, hook, args, filter) {\n if (hook === 'beforeInit') {\n this._init = this._createDescriptors(chart, true);\n this._notify(this._init, chart, 'install');\n }\n\n const descriptors = filter ? this._descriptors(chart).filter(filter) : this._descriptors(chart);\n const result = this._notify(descriptors, chart, hook, args);\n\n if (hook === 'afterDestroy') {\n this._notify(descriptors, chart, 'stop');\n this._notify(this._init, chart, 'uninstall');\n }\n return result;\n }\n\n /**\n\t * @private\n\t */\n _notify(descriptors, chart, hook, args) {\n args = args || {};\n for (const descriptor of descriptors) {\n const plugin = descriptor.plugin;\n const method = plugin[hook];\n const params = [chart, args, descriptor.options];\n if (callCallback(method, params, plugin) === false && args.cancelable) {\n return false;\n }\n }\n\n return true;\n }\n\n invalidate() {\n // When plugins are registered, there is the possibility of a double\n // invalidate situation. In this case, we only want to invalidate once.\n // If we invalidate multiple times, the `_oldCache` is lost and all of the\n // plugins are restarted without being correctly stopped.\n // See https://github.com/chartjs/Chart.js/issues/8147\n if (!isNullOrUndef(this._cache)) {\n this._oldCache = this._cache;\n this._cache = undefined;\n }\n }\n\n /**\n\t * @param {Chart} chart\n\t * @private\n\t */\n _descriptors(chart) {\n if (this._cache) {\n return this._cache;\n }\n\n const descriptors = this._cache = this._createDescriptors(chart);\n\n this._notifyStateChanges(chart);\n\n return descriptors;\n }\n\n _createDescriptors(chart, all) {\n const config = chart && chart.config;\n const options = valueOrDefault(config.options && config.options.plugins, {});\n const plugins = allPlugins(config);\n // options === false => all plugins are disabled\n return options === false && !all ? [] : createDescriptors(chart, plugins, options, all);\n }\n\n /**\n\t * @param {Chart} chart\n\t * @private\n\t */\n _notifyStateChanges(chart) {\n const previousDescriptors = this._oldCache || [];\n const descriptors = this._cache;\n const diff = (a, b) => a.filter(x => !b.some(y => x.plugin.id === y.plugin.id));\n this._notify(diff(previousDescriptors, descriptors), chart, 'stop');\n this._notify(diff(descriptors, previousDescriptors), chart, 'start');\n }\n}\n\n/**\n * @param {import('./core.config.js').default} config\n */\nfunction allPlugins(config) {\n const localIds = {};\n const plugins = [];\n const keys = Object.keys(registry.plugins.items);\n for (let i = 0; i < keys.length; i++) {\n plugins.push(registry.getPlugin(keys[i]));\n }\n\n const local = config.plugins || [];\n for (let i = 0; i < local.length; i++) {\n const plugin = local[i];\n\n if (plugins.indexOf(plugin) === -1) {\n plugins.push(plugin);\n localIds[plugin.id] = true;\n }\n }\n\n return {plugins, localIds};\n}\n\nfunction getOpts(options, all) {\n if (!all && options === false) {\n return null;\n }\n if (options === true) {\n return {};\n }\n return options;\n}\n\nfunction createDescriptors(chart, {plugins, localIds}, options, all) {\n const result = [];\n const context = chart.getContext();\n\n for (const plugin of plugins) {\n const id = plugin.id;\n const opts = getOpts(options[id], all);\n if (opts === null) {\n continue;\n }\n result.push({\n plugin,\n options: pluginOpts(chart.config, {plugin, local: localIds[id]}, opts, context)\n });\n }\n\n return result;\n}\n\nfunction pluginOpts(config, {plugin, local}, opts, context) {\n const keys = config.pluginScopeKeys(plugin);\n const scopes = config.getOptionScopes(opts, keys);\n if (local && plugin.defaults) {\n // make sure plugin defaults are in scopes for local (not registered) plugins\n scopes.push(plugin.defaults);\n }\n return config.createResolver(scopes, context, [''], {\n // These are just defaults that plugins can override\n scriptable: false,\n indexable: false,\n allKeys: true\n });\n}\n","import defaults, {overrides, descriptors} from './core.defaults.js';\nimport {mergeIf, resolveObjectKey, isArray, isFunction, valueOrDefault, isObject} from '../helpers/helpers.core.js';\nimport {_attachContext, _createResolver, _descriptors} from '../helpers/helpers.config.js';\n\nexport function getIndexAxis(type, options) {\n const datasetDefaults = defaults.datasets[type] || {};\n const datasetOptions = (options.datasets || {})[type] || {};\n return datasetOptions.indexAxis || options.indexAxis || datasetDefaults.indexAxis || 'x';\n}\n\nfunction getAxisFromDefaultScaleID(id, indexAxis) {\n let axis = id;\n if (id === '_index_') {\n axis = indexAxis;\n } else if (id === '_value_') {\n axis = indexAxis === 'x' ? 'y' : 'x';\n }\n return axis;\n}\n\nfunction getDefaultScaleIDFromAxis(axis, indexAxis) {\n return axis === indexAxis ? '_index_' : '_value_';\n}\n\nfunction idMatchesAxis(id) {\n if (id === 'x' || id === 'y' || id === 'r') {\n return id;\n }\n}\n\nfunction axisFromPosition(position) {\n if (position === 'top' || position === 'bottom') {\n return 'x';\n }\n if (position === 'left' || position === 'right') {\n return 'y';\n }\n}\n\nexport function determineAxis(id, ...scaleOptions) {\n if (idMatchesAxis(id)) {\n return id;\n }\n for (const opts of scaleOptions) {\n const axis = opts.axis\n || axisFromPosition(opts.position)\n || id.length > 1 && idMatchesAxis(id[0].toLowerCase());\n if (axis) {\n return axis;\n }\n }\n throw new Error(`Cannot determine type of '${id}' axis. Please provide 'axis' or 'position' option.`);\n}\n\nfunction getAxisFromDataset(id, axis, dataset) {\n if (dataset[axis + 'AxisID'] === id) {\n return {axis};\n }\n}\n\nfunction retrieveAxisFromDatasets(id, config) {\n if (config.data && config.data.datasets) {\n const boundDs = config.data.datasets.filter((d) => d.xAxisID === id || d.yAxisID === id);\n if (boundDs.length) {\n return getAxisFromDataset(id, 'x', boundDs[0]) || getAxisFromDataset(id, 'y', boundDs[0]);\n }\n }\n return {};\n}\n\nfunction mergeScaleConfig(config, options) {\n const chartDefaults = overrides[config.type] || {scales: {}};\n const configScales = options.scales || {};\n const chartIndexAxis = getIndexAxis(config.type, options);\n const scales = Object.create(null);\n\n // First figure out first scale id's per axis.\n Object.keys(configScales).forEach(id => {\n const scaleConf = configScales[id];\n if (!isObject(scaleConf)) {\n return console.error(`Invalid scale configuration for scale: ${id}`);\n }\n if (scaleConf._proxy) {\n return console.warn(`Ignoring resolver passed as options for scale: ${id}`);\n }\n const axis = determineAxis(id, scaleConf, retrieveAxisFromDatasets(id, config), defaults.scales[scaleConf.type]);\n const defaultId = getDefaultScaleIDFromAxis(axis, chartIndexAxis);\n const defaultScaleOptions = chartDefaults.scales || {};\n scales[id] = mergeIf(Object.create(null), [{axis}, scaleConf, defaultScaleOptions[axis], defaultScaleOptions[defaultId]]);\n });\n\n // Then merge dataset defaults to scale configs\n config.data.datasets.forEach(dataset => {\n const type = dataset.type || config.type;\n const indexAxis = dataset.indexAxis || getIndexAxis(type, options);\n const datasetDefaults = overrides[type] || {};\n const defaultScaleOptions = datasetDefaults.scales || {};\n Object.keys(defaultScaleOptions).forEach(defaultID => {\n const axis = getAxisFromDefaultScaleID(defaultID, indexAxis);\n const id = dataset[axis + 'AxisID'] || axis;\n scales[id] = scales[id] || Object.create(null);\n mergeIf(scales[id], [{axis}, configScales[id], defaultScaleOptions[defaultID]]);\n });\n });\n\n // apply scale defaults, if not overridden by dataset defaults\n Object.keys(scales).forEach(key => {\n const scale = scales[key];\n mergeIf(scale, [defaults.scales[scale.type], defaults.scale]);\n });\n\n return scales;\n}\n\nfunction initOptions(config) {\n const options = config.options || (config.options = {});\n\n options.plugins = valueOrDefault(options.plugins, {});\n options.scales = mergeScaleConfig(config, options);\n}\n\nfunction initData(data) {\n data = data || {};\n data.datasets = data.datasets || [];\n data.labels = data.labels || [];\n return data;\n}\n\nfunction initConfig(config) {\n config = config || {};\n config.data = initData(config.data);\n\n initOptions(config);\n\n return config;\n}\n\nconst keyCache = new Map();\nconst keysCached = new Set();\n\nfunction cachedKeys(cacheKey, generate) {\n let keys = keyCache.get(cacheKey);\n if (!keys) {\n keys = generate();\n keyCache.set(cacheKey, keys);\n keysCached.add(keys);\n }\n return keys;\n}\n\nconst addIfFound = (set, obj, key) => {\n const opts = resolveObjectKey(obj, key);\n if (opts !== undefined) {\n set.add(opts);\n }\n};\n\nexport default class Config {\n constructor(config) {\n this._config = initConfig(config);\n this._scopeCache = new Map();\n this._resolverCache = new Map();\n }\n\n get platform() {\n return this._config.platform;\n }\n\n get type() {\n return this._config.type;\n }\n\n set type(type) {\n this._config.type = type;\n }\n\n get data() {\n return this._config.data;\n }\n\n set data(data) {\n this._config.data = initData(data);\n }\n\n get options() {\n return this._config.options;\n }\n\n set options(options) {\n this._config.options = options;\n }\n\n get plugins() {\n return this._config.plugins;\n }\n\n update() {\n const config = this._config;\n this.clearCache();\n initOptions(config);\n }\n\n clearCache() {\n this._scopeCache.clear();\n this._resolverCache.clear();\n }\n\n /**\n * Returns the option scope keys for resolving dataset options.\n * These keys do not include the dataset itself, because it is not under options.\n * @param {string} datasetType\n * @return {string[][]}\n */\n datasetScopeKeys(datasetType) {\n return cachedKeys(datasetType,\n () => [[\n `datasets.${datasetType}`,\n ''\n ]]);\n }\n\n /**\n * Returns the option scope keys for resolving dataset animation options.\n * These keys do not include the dataset itself, because it is not under options.\n * @param {string} datasetType\n * @param {string} transition\n * @return {string[][]}\n */\n datasetAnimationScopeKeys(datasetType, transition) {\n return cachedKeys(`${datasetType}.transition.${transition}`,\n () => [\n [\n `datasets.${datasetType}.transitions.${transition}`,\n `transitions.${transition}`,\n ],\n // The following are used for looking up the `animations` and `animation` keys\n [\n `datasets.${datasetType}`,\n ''\n ]\n ]);\n }\n\n /**\n * Returns the options scope keys for resolving element options that belong\n * to an dataset. These keys do not include the dataset itself, because it\n * is not under options.\n * @param {string} datasetType\n * @param {string} elementType\n * @return {string[][]}\n */\n datasetElementScopeKeys(datasetType, elementType) {\n return cachedKeys(`${datasetType}-${elementType}`,\n () => [[\n `datasets.${datasetType}.elements.${elementType}`,\n `datasets.${datasetType}`,\n `elements.${elementType}`,\n ''\n ]]);\n }\n\n /**\n * Returns the options scope keys for resolving plugin options.\n * @param {{id: string, additionalOptionScopes?: string[]}} plugin\n * @return {string[][]}\n */\n pluginScopeKeys(plugin) {\n const id = plugin.id;\n const type = this.type;\n return cachedKeys(`${type}-plugin-${id}`,\n () => [[\n `plugins.${id}`,\n ...plugin.additionalOptionScopes || [],\n ]]);\n }\n\n /**\n * @private\n */\n _cachedScopes(mainScope, resetCache) {\n const _scopeCache = this._scopeCache;\n let cache = _scopeCache.get(mainScope);\n if (!cache || resetCache) {\n cache = new Map();\n _scopeCache.set(mainScope, cache);\n }\n return cache;\n }\n\n /**\n * Resolves the objects from options and defaults for option value resolution.\n * @param {object} mainScope - The main scope object for options\n * @param {string[][]} keyLists - The arrays of keys in resolution order\n * @param {boolean} [resetCache] - reset the cache for this mainScope\n */\n getOptionScopes(mainScope, keyLists, resetCache) {\n const {options, type} = this;\n const cache = this._cachedScopes(mainScope, resetCache);\n const cached = cache.get(keyLists);\n if (cached) {\n return cached;\n }\n\n const scopes = new Set();\n\n keyLists.forEach(keys => {\n if (mainScope) {\n scopes.add(mainScope);\n keys.forEach(key => addIfFound(scopes, mainScope, key));\n }\n keys.forEach(key => addIfFound(scopes, options, key));\n keys.forEach(key => addIfFound(scopes, overrides[type] || {}, key));\n keys.forEach(key => addIfFound(scopes, defaults, key));\n keys.forEach(key => addIfFound(scopes, descriptors, key));\n });\n\n const array = Array.from(scopes);\n if (array.length === 0) {\n array.push(Object.create(null));\n }\n if (keysCached.has(keyLists)) {\n cache.set(keyLists, array);\n }\n return array;\n }\n\n /**\n * Returns the option scopes for resolving chart options\n * @return {object[]}\n */\n chartOptionScopes() {\n const {options, type} = this;\n\n return [\n options,\n overrides[type] || {},\n defaults.datasets[type] || {}, // https://github.com/chartjs/Chart.js/issues/8531\n {type},\n defaults,\n descriptors\n ];\n }\n\n /**\n * @param {object[]} scopes\n * @param {string[]} names\n * @param {function|object} context\n * @param {string[]} [prefixes]\n * @return {object}\n */\n resolveNamedOptions(scopes, names, context, prefixes = ['']) {\n const result = {$shared: true};\n const {resolver, subPrefixes} = getResolver(this._resolverCache, scopes, prefixes);\n let options = resolver;\n if (needContext(resolver, names)) {\n result.$shared = false;\n context = isFunction(context) ? context() : context;\n // subResolver is passed to scriptable options. It should not resolve to hover options.\n const subResolver = this.createResolver(scopes, context, subPrefixes);\n options = _attachContext(resolver, context, subResolver);\n }\n\n for (const prop of names) {\n result[prop] = options[prop];\n }\n return result;\n }\n\n /**\n * @param {object[]} scopes\n * @param {object} [context]\n * @param {string[]} [prefixes]\n * @param {{scriptable: boolean, indexable: boolean, allKeys?: boolean}} [descriptorDefaults]\n */\n createResolver(scopes, context, prefixes = [''], descriptorDefaults) {\n const {resolver} = getResolver(this._resolverCache, scopes, prefixes);\n return isObject(context)\n ? _attachContext(resolver, context, undefined, descriptorDefaults)\n : resolver;\n }\n}\n\nfunction getResolver(resolverCache, scopes, prefixes) {\n let cache = resolverCache.get(scopes);\n if (!cache) {\n cache = new Map();\n resolverCache.set(scopes, cache);\n }\n const cacheKey = prefixes.join();\n let cached = cache.get(cacheKey);\n if (!cached) {\n const resolver = _createResolver(scopes, prefixes);\n cached = {\n resolver,\n subPrefixes: prefixes.filter(p => !p.toLowerCase().includes('hover'))\n };\n cache.set(cacheKey, cached);\n }\n return cached;\n}\n\nconst hasFunction = value => isObject(value)\n && Object.getOwnPropertyNames(value).reduce((acc, key) => acc || isFunction(value[key]), false);\n\nfunction needContext(proxy, names) {\n const {isScriptable, isIndexable} = _descriptors(proxy);\n\n for (const prop of names) {\n const scriptable = isScriptable(prop);\n const indexable = isIndexable(prop);\n const value = (indexable || scriptable) && proxy[prop];\n if ((scriptable && (isFunction(value) || hasFunction(value)))\n || (indexable && isArray(value))) {\n return true;\n }\n }\n return false;\n}\n","import animator from './core.animator.js';\nimport defaults, {overrides} from './core.defaults.js';\nimport Interaction from './core.interaction.js';\nimport layouts from './core.layouts.js';\nimport {_detectPlatform} from '../platform/index.js';\nimport PluginService from './core.plugins.js';\nimport registry from './core.registry.js';\nimport Config, {determineAxis, getIndexAxis} from './core.config.js';\nimport {retinaScale, _isDomSupported} from '../helpers/helpers.dom.js';\nimport {each, callback as callCallback, uid, valueOrDefault, _elementsEqual, isNullOrUndef, setsEqual, defined, isFunction, _isClickEvent} from '../helpers/helpers.core.js';\nimport {clearCanvas, clipArea, createContext, unclipArea, _isPointInArea} from '../helpers/index.js';\n// @ts-ignore\nimport {version} from '../../package.json';\nimport {debounce} from '../helpers/helpers.extras.js';\n\n/**\n * @typedef { import('../types/index.js').ChartEvent } ChartEvent\n * @typedef { import('../types/index.js').Point } Point\n */\n\nconst KNOWN_POSITIONS = ['top', 'bottom', 'left', 'right', 'chartArea'];\nfunction positionIsHorizontal(position, axis) {\n return position === 'top' || position === 'bottom' || (KNOWN_POSITIONS.indexOf(position) === -1 && axis === 'x');\n}\n\nfunction compare2Level(l1, l2) {\n return function(a, b) {\n return a[l1] === b[l1]\n ? a[l2] - b[l2]\n : a[l1] - b[l1];\n };\n}\n\nfunction onAnimationsComplete(context) {\n const chart = context.chart;\n const animationOptions = chart.options.animation;\n\n chart.notifyPlugins('afterRender');\n callCallback(animationOptions && animationOptions.onComplete, [context], chart);\n}\n\nfunction onAnimationProgress(context) {\n const chart = context.chart;\n const animationOptions = chart.options.animation;\n callCallback(animationOptions && animationOptions.onProgress, [context], chart);\n}\n\n/**\n * Chart.js can take a string id of a canvas element, a 2d context, or a canvas element itself.\n * Attempt to unwrap the item passed into the chart constructor so that it is a canvas element (if possible).\n */\nfunction getCanvas(item) {\n if (_isDomSupported() && typeof item === 'string') {\n item = document.getElementById(item);\n } else if (item && item.length) {\n // Support for array based queries (such as jQuery)\n item = item[0];\n }\n\n if (item && item.canvas) {\n // Support for any object associated to a canvas (including a context2d)\n item = item.canvas;\n }\n return item;\n}\n\nconst instances = {};\nconst getChart = (key) => {\n const canvas = getCanvas(key);\n return Object.values(instances).filter((c) => c.canvas === canvas).pop();\n};\n\nfunction moveNumericKeys(obj, start, move) {\n const keys = Object.keys(obj);\n for (const key of keys) {\n const intKey = +key;\n if (intKey >= start) {\n const value = obj[key];\n delete obj[key];\n if (move > 0 || intKey > start) {\n obj[intKey + move] = value;\n }\n }\n }\n}\n\n/**\n * @param {ChartEvent} e\n * @param {ChartEvent|null} lastEvent\n * @param {boolean} inChartArea\n * @param {boolean} isClick\n * @returns {ChartEvent|null}\n */\nfunction determineLastEvent(e, lastEvent, inChartArea, isClick) {\n if (!inChartArea || e.type === 'mouseout') {\n return null;\n }\n if (isClick) {\n return lastEvent;\n }\n return e;\n}\n\nfunction getDatasetArea(meta) {\n const {xScale, yScale} = meta;\n if (xScale && yScale) {\n return {\n left: xScale.left,\n right: xScale.right,\n top: yScale.top,\n bottom: yScale.bottom\n };\n }\n}\n\nclass Chart {\n\n static defaults = defaults;\n static instances = instances;\n static overrides = overrides;\n static registry = registry;\n static version = version;\n static getChart = getChart;\n\n static register(...items) {\n registry.add(...items);\n invalidatePlugins();\n }\n\n static unregister(...items) {\n registry.remove(...items);\n invalidatePlugins();\n }\n\n // eslint-disable-next-line max-statements\n constructor(item, userConfig) {\n const config = this.config = new Config(userConfig);\n const initialCanvas = getCanvas(item);\n const existingChart = getChart(initialCanvas);\n if (existingChart) {\n throw new Error(\n 'Canvas is already in use. Chart with ID \\'' + existingChart.id + '\\'' +\n\t\t\t\t' must be destroyed before the canvas with ID \\'' + existingChart.canvas.id + '\\' can be reused.'\n );\n }\n\n const options = config.createResolver(config.chartOptionScopes(), this.getContext());\n\n this.platform = new (config.platform || _detectPlatform(initialCanvas))();\n this.platform.updateConfig(config);\n\n const context = this.platform.acquireContext(initialCanvas, options.aspectRatio);\n const canvas = context && context.canvas;\n const height = canvas && canvas.height;\n const width = canvas && canvas.width;\n\n this.id = uid();\n this.ctx = context;\n this.canvas = canvas;\n this.width = width;\n this.height = height;\n this._options = options;\n // Store the previously used aspect ratio to determine if a resize\n // is needed during updates. Do this after _options is set since\n // aspectRatio uses a getter\n this._aspectRatio = this.aspectRatio;\n this._layers = [];\n this._metasets = [];\n this._stacks = undefined;\n this.boxes = [];\n this.currentDevicePixelRatio = undefined;\n this.chartArea = undefined;\n this._active = [];\n this._lastEvent = undefined;\n this._listeners = {};\n /** @type {?{attach?: function, detach?: function, resize?: function}} */\n this._responsiveListeners = undefined;\n this._sortedMetasets = [];\n this.scales = {};\n this._plugins = new PluginService();\n this.$proxies = {};\n this._hiddenIndices = {};\n this.attached = false;\n this._animationsDisabled = undefined;\n this.$context = undefined;\n this._doResize = debounce(mode => this.update(mode), options.resizeDelay || 0);\n this._dataChanges = [];\n\n // Add the chart instance to the global namespace\n instances[this.id] = this;\n\n if (!context || !canvas) {\n // The given item is not a compatible context2d element, let's return before finalizing\n // the chart initialization but after setting basic chart / controller properties that\n // can help to figure out that the chart is not valid (e.g chart.canvas !== null);\n // https://github.com/chartjs/Chart.js/issues/2807\n console.error(\"Failed to create chart: can't acquire context from the given item\");\n return;\n }\n\n animator.listen(this, 'complete', onAnimationsComplete);\n animator.listen(this, 'progress', onAnimationProgress);\n\n this._initialize();\n if (this.attached) {\n this.update();\n }\n }\n\n get aspectRatio() {\n const {options: {aspectRatio, maintainAspectRatio}, width, height, _aspectRatio} = this;\n if (!isNullOrUndef(aspectRatio)) {\n // If aspectRatio is defined in options, use that.\n return aspectRatio;\n }\n\n if (maintainAspectRatio && _aspectRatio) {\n // If maintainAspectRatio is truthly and we had previously determined _aspectRatio, use that\n return _aspectRatio;\n }\n\n // Calculate\n return height ? width / height : null;\n }\n\n get data() {\n return this.config.data;\n }\n\n set data(data) {\n this.config.data = data;\n }\n\n get options() {\n return this._options;\n }\n\n set options(options) {\n this.config.options = options;\n }\n\n get registry() {\n return registry;\n }\n\n /**\n\t * @private\n\t */\n _initialize() {\n // Before init plugin notification\n this.notifyPlugins('beforeInit');\n\n if (this.options.responsive) {\n this.resize();\n } else {\n retinaScale(this, this.options.devicePixelRatio);\n }\n\n this.bindEvents();\n\n // After init plugin notification\n this.notifyPlugins('afterInit');\n\n return this;\n }\n\n clear() {\n clearCanvas(this.canvas, this.ctx);\n return this;\n }\n\n stop() {\n animator.stop(this);\n return this;\n }\n\n /**\n\t * Resize the chart to its container or to explicit dimensions.\n\t * @param {number} [width]\n\t * @param {number} [height]\n\t */\n resize(width, height) {\n if (!animator.running(this)) {\n this._resize(width, height);\n } else {\n this._resizeBeforeDraw = {width, height};\n }\n }\n\n _resize(width, height) {\n const options = this.options;\n const canvas = this.canvas;\n const aspectRatio = options.maintainAspectRatio && this.aspectRatio;\n const newSize = this.platform.getMaximumSize(canvas, width, height, aspectRatio);\n const newRatio = options.devicePixelRatio || this.platform.getDevicePixelRatio();\n const mode = this.width ? 'resize' : 'attach';\n\n this.width = newSize.width;\n this.height = newSize.height;\n this._aspectRatio = this.aspectRatio;\n if (!retinaScale(this, newRatio, true)) {\n return;\n }\n\n this.notifyPlugins('resize', {size: newSize});\n\n callCallback(options.onResize, [this, newSize], this);\n\n if (this.attached) {\n if (this._doResize(mode)) {\n // The resize update is delayed, only draw without updating.\n this.render();\n }\n }\n }\n\n ensureScalesHaveIDs() {\n const options = this.options;\n const scalesOptions = options.scales || {};\n\n each(scalesOptions, (axisOptions, axisID) => {\n axisOptions.id = axisID;\n });\n }\n\n /**\n\t * Builds a map of scale ID to scale object for future lookup.\n\t */\n buildOrUpdateScales() {\n const options = this.options;\n const scaleOpts = options.scales;\n const scales = this.scales;\n const updated = Object.keys(scales).reduce((obj, id) => {\n obj[id] = false;\n return obj;\n }, {});\n let items = [];\n\n if (scaleOpts) {\n items = items.concat(\n Object.keys(scaleOpts).map((id) => {\n const scaleOptions = scaleOpts[id];\n const axis = determineAxis(id, scaleOptions);\n const isRadial = axis === 'r';\n const isHorizontal = axis === 'x';\n return {\n options: scaleOptions,\n dposition: isRadial ? 'chartArea' : isHorizontal ? 'bottom' : 'left',\n dtype: isRadial ? 'radialLinear' : isHorizontal ? 'category' : 'linear'\n };\n })\n );\n }\n\n each(items, (item) => {\n const scaleOptions = item.options;\n const id = scaleOptions.id;\n const axis = determineAxis(id, scaleOptions);\n const scaleType = valueOrDefault(scaleOptions.type, item.dtype);\n\n if (scaleOptions.position === undefined || positionIsHorizontal(scaleOptions.position, axis) !== positionIsHorizontal(item.dposition)) {\n scaleOptions.position = item.dposition;\n }\n\n updated[id] = true;\n let scale = null;\n if (id in scales && scales[id].type === scaleType) {\n scale = scales[id];\n } else {\n const scaleClass = registry.getScale(scaleType);\n scale = new scaleClass({\n id,\n type: scaleType,\n ctx: this.ctx,\n chart: this\n });\n scales[scale.id] = scale;\n }\n\n scale.init(scaleOptions, options);\n });\n // clear up discarded scales\n each(updated, (hasUpdated, id) => {\n if (!hasUpdated) {\n delete scales[id];\n }\n });\n\n each(scales, (scale) => {\n layouts.configure(this, scale, scale.options);\n layouts.addBox(this, scale);\n });\n }\n\n /**\n\t * @private\n\t */\n _updateMetasets() {\n const metasets = this._metasets;\n const numData = this.data.datasets.length;\n const numMeta = metasets.length;\n\n metasets.sort((a, b) => a.index - b.index);\n if (numMeta > numData) {\n for (let i = numData; i < numMeta; ++i) {\n this._destroyDatasetMeta(i);\n }\n metasets.splice(numData, numMeta - numData);\n }\n this._sortedMetasets = metasets.slice(0).sort(compare2Level('order', 'index'));\n }\n\n /**\n\t * @private\n\t */\n _removeUnreferencedMetasets() {\n const {_metasets: metasets, data: {datasets}} = this;\n if (metasets.length > datasets.length) {\n delete this._stacks;\n }\n metasets.forEach((meta, index) => {\n if (datasets.filter(x => x === meta._dataset).length === 0) {\n this._destroyDatasetMeta(index);\n }\n });\n }\n\n buildOrUpdateControllers() {\n const newControllers = [];\n const datasets = this.data.datasets;\n let i, ilen;\n\n this._removeUnreferencedMetasets();\n\n for (i = 0, ilen = datasets.length; i < ilen; i++) {\n const dataset = datasets[i];\n let meta = this.getDatasetMeta(i);\n const type = dataset.type || this.config.type;\n\n if (meta.type && meta.type !== type) {\n this._destroyDatasetMeta(i);\n meta = this.getDatasetMeta(i);\n }\n meta.type = type;\n meta.indexAxis = dataset.indexAxis || getIndexAxis(type, this.options);\n meta.order = dataset.order || 0;\n meta.index = i;\n meta.label = '' + dataset.label;\n meta.visible = this.isDatasetVisible(i);\n\n if (meta.controller) {\n meta.controller.updateIndex(i);\n meta.controller.linkScales();\n } else {\n const ControllerClass = registry.getController(type);\n const {datasetElementType, dataElementType} = defaults.datasets[type];\n Object.assign(ControllerClass, {\n dataElementType: registry.getElement(dataElementType),\n datasetElementType: datasetElementType && registry.getElement(datasetElementType)\n });\n meta.controller = new ControllerClass(this, i);\n newControllers.push(meta.controller);\n }\n }\n\n this._updateMetasets();\n return newControllers;\n }\n\n /**\n\t * Reset the elements of all datasets\n\t * @private\n\t */\n _resetElements() {\n each(this.data.datasets, (dataset, datasetIndex) => {\n this.getDatasetMeta(datasetIndex).controller.reset();\n }, this);\n }\n\n /**\n\t* Resets the chart back to its state before the initial animation\n\t*/\n reset() {\n this._resetElements();\n this.notifyPlugins('reset');\n }\n\n update(mode) {\n const config = this.config;\n\n config.update();\n const options = this._options = config.createResolver(config.chartOptionScopes(), this.getContext());\n const animsDisabled = this._animationsDisabled = !options.animation;\n\n this._updateScales();\n this._checkEventBindings();\n this._updateHiddenIndices();\n\n // plugins options references might have change, let's invalidate the cache\n // https://github.com/chartjs/Chart.js/issues/5111#issuecomment-355934167\n this._plugins.invalidate();\n\n if (this.notifyPlugins('beforeUpdate', {mode, cancelable: true}) === false) {\n return;\n }\n\n // Make sure dataset controllers are updated and new controllers are reset\n const newControllers = this.buildOrUpdateControllers();\n\n this.notifyPlugins('beforeElementsUpdate');\n\n // Make sure all dataset controllers have correct meta data counts\n let minPadding = 0;\n for (let i = 0, ilen = this.data.datasets.length; i < ilen; i++) {\n const {controller} = this.getDatasetMeta(i);\n const reset = !animsDisabled && newControllers.indexOf(controller) === -1;\n // New controllers will be reset after the layout pass, so we only want to modify\n // elements added to new datasets\n controller.buildOrUpdateElements(reset);\n minPadding = Math.max(+controller.getMaxOverflow(), minPadding);\n }\n minPadding = this._minPadding = options.layout.autoPadding ? minPadding : 0;\n this._updateLayout(minPadding);\n\n // Only reset the controllers if we have animations\n if (!animsDisabled) {\n // Can only reset the new controllers after the scales have been updated\n // Reset is done to get the starting point for the initial animation\n each(newControllers, (controller) => {\n controller.reset();\n });\n }\n\n this._updateDatasets(mode);\n\n // Do this before render so that any plugins that need final scale updates can use it\n this.notifyPlugins('afterUpdate', {mode});\n\n this._layers.sort(compare2Level('z', '_idx'));\n\n // Replay last event from before update, or set hover styles on active elements\n const {_active, _lastEvent} = this;\n if (_lastEvent) {\n this._eventHandler(_lastEvent, true);\n } else if (_active.length) {\n this._updateHoverStyles(_active, _active, true);\n }\n\n this.render();\n }\n\n /**\n * @private\n */\n _updateScales() {\n each(this.scales, (scale) => {\n layouts.removeBox(this, scale);\n });\n\n this.ensureScalesHaveIDs();\n this.buildOrUpdateScales();\n }\n\n /**\n * @private\n */\n _checkEventBindings() {\n const options = this.options;\n const existingEvents = new Set(Object.keys(this._listeners));\n const newEvents = new Set(options.events);\n\n if (!setsEqual(existingEvents, newEvents) || !!this._responsiveListeners !== options.responsive) {\n // The configured events have changed. Rebind.\n this.unbindEvents();\n this.bindEvents();\n }\n }\n\n /**\n * @private\n */\n _updateHiddenIndices() {\n const {_hiddenIndices} = this;\n const changes = this._getUniformDataChanges() || [];\n for (const {method, start, count} of changes) {\n const move = method === '_removeElements' ? -count : count;\n moveNumericKeys(_hiddenIndices, start, move);\n }\n }\n\n /**\n * @private\n */\n _getUniformDataChanges() {\n const _dataChanges = this._dataChanges;\n if (!_dataChanges || !_dataChanges.length) {\n return;\n }\n\n this._dataChanges = [];\n const datasetCount = this.data.datasets.length;\n const makeSet = (idx) => new Set(\n _dataChanges\n .filter(c => c[0] === idx)\n .map((c, i) => i + ',' + c.splice(1).join(','))\n );\n\n const changeSet = makeSet(0);\n for (let i = 1; i < datasetCount; i++) {\n if (!setsEqual(changeSet, makeSet(i))) {\n return;\n }\n }\n return Array.from(changeSet)\n .map(c => c.split(','))\n .map(a => ({method: a[1], start: +a[2], count: +a[3]}));\n }\n\n /**\n\t * Updates the chart layout unless a plugin returns `false` to the `beforeLayout`\n\t * hook, in which case, plugins will not be called on `afterLayout`.\n\t * @private\n\t */\n _updateLayout(minPadding) {\n if (this.notifyPlugins('beforeLayout', {cancelable: true}) === false) {\n return;\n }\n\n layouts.update(this, this.width, this.height, minPadding);\n\n const area = this.chartArea;\n const noArea = area.width <= 0 || area.height <= 0;\n\n this._layers = [];\n each(this.boxes, (box) => {\n if (noArea && box.position === 'chartArea') {\n // Skip drawing and configuring chartArea boxes when chartArea is zero or negative\n return;\n }\n\n // configure is called twice, once in core.scale.update and once here.\n // Here the boxes are fully updated and at their final positions.\n if (box.configure) {\n box.configure();\n }\n this._layers.push(...box._layers());\n }, this);\n\n this._layers.forEach((item, index) => {\n item._idx = index;\n });\n\n this.notifyPlugins('afterLayout');\n }\n\n /**\n\t * Updates all datasets unless a plugin returns `false` to the `beforeDatasetsUpdate`\n\t * hook, in which case, plugins will not be called on `afterDatasetsUpdate`.\n\t * @private\n\t */\n _updateDatasets(mode) {\n if (this.notifyPlugins('beforeDatasetsUpdate', {mode, cancelable: true}) === false) {\n return;\n }\n\n for (let i = 0, ilen = this.data.datasets.length; i < ilen; ++i) {\n this.getDatasetMeta(i).controller.configure();\n }\n\n for (let i = 0, ilen = this.data.datasets.length; i < ilen; ++i) {\n this._updateDataset(i, isFunction(mode) ? mode({datasetIndex: i}) : mode);\n }\n\n this.notifyPlugins('afterDatasetsUpdate', {mode});\n }\n\n /**\n\t * Updates dataset at index unless a plugin returns `false` to the `beforeDatasetUpdate`\n\t * hook, in which case, plugins will not be called on `afterDatasetUpdate`.\n\t * @private\n\t */\n _updateDataset(index, mode) {\n const meta = this.getDatasetMeta(index);\n const args = {meta, index, mode, cancelable: true};\n\n if (this.notifyPlugins('beforeDatasetUpdate', args) === false) {\n return;\n }\n\n meta.controller._update(mode);\n\n args.cancelable = false;\n this.notifyPlugins('afterDatasetUpdate', args);\n }\n\n render() {\n if (this.notifyPlugins('beforeRender', {cancelable: true}) === false) {\n return;\n }\n\n if (animator.has(this)) {\n if (this.attached && !animator.running(this)) {\n animator.start(this);\n }\n } else {\n this.draw();\n onAnimationsComplete({chart: this});\n }\n }\n\n draw() {\n let i;\n if (this._resizeBeforeDraw) {\n const {width, height} = this._resizeBeforeDraw;\n this._resize(width, height);\n this._resizeBeforeDraw = null;\n }\n this.clear();\n\n if (this.width <= 0 || this.height <= 0) {\n return;\n }\n\n if (this.notifyPlugins('beforeDraw', {cancelable: true}) === false) {\n return;\n }\n\n // Because of plugin hooks (before/afterDatasetsDraw), datasets can't\n // currently be part of layers. Instead, we draw\n // layers <= 0 before(default, backward compat), and the rest after\n const layers = this._layers;\n for (i = 0; i < layers.length && layers[i].z <= 0; ++i) {\n layers[i].draw(this.chartArea);\n }\n\n this._drawDatasets();\n\n // Rest of layers\n for (; i < layers.length; ++i) {\n layers[i].draw(this.chartArea);\n }\n\n this.notifyPlugins('afterDraw');\n }\n\n /**\n\t * @private\n\t */\n _getSortedDatasetMetas(filterVisible) {\n const metasets = this._sortedMetasets;\n const result = [];\n let i, ilen;\n\n for (i = 0, ilen = metasets.length; i < ilen; ++i) {\n const meta = metasets[i];\n if (!filterVisible || meta.visible) {\n result.push(meta);\n }\n }\n\n return result;\n }\n\n /**\n\t * Gets the visible dataset metas in drawing order\n\t * @return {object[]}\n\t */\n getSortedVisibleDatasetMetas() {\n return this._getSortedDatasetMetas(true);\n }\n\n /**\n\t * Draws all datasets unless a plugin returns `false` to the `beforeDatasetsDraw`\n\t * hook, in which case, plugins will not be called on `afterDatasetsDraw`.\n\t * @private\n\t */\n _drawDatasets() {\n if (this.notifyPlugins('beforeDatasetsDraw', {cancelable: true}) === false) {\n return;\n }\n\n const metasets = this.getSortedVisibleDatasetMetas();\n for (let i = metasets.length - 1; i >= 0; --i) {\n this._drawDataset(metasets[i]);\n }\n\n this.notifyPlugins('afterDatasetsDraw');\n }\n\n /**\n\t * Draws dataset at index unless a plugin returns `false` to the `beforeDatasetDraw`\n\t * hook, in which case, plugins will not be called on `afterDatasetDraw`.\n\t * @private\n\t */\n _drawDataset(meta) {\n const ctx = this.ctx;\n const clip = meta._clip;\n const useClip = !clip.disabled;\n const area = getDatasetArea(meta) || this.chartArea;\n const args = {\n meta,\n index: meta.index,\n cancelable: true\n };\n\n if (this.notifyPlugins('beforeDatasetDraw', args) === false) {\n return;\n }\n\n if (useClip) {\n clipArea(ctx, {\n left: clip.left === false ? 0 : area.left - clip.left,\n right: clip.right === false ? this.width : area.right + clip.right,\n top: clip.top === false ? 0 : area.top - clip.top,\n bottom: clip.bottom === false ? this.height : area.bottom + clip.bottom\n });\n }\n\n meta.controller.draw();\n\n if (useClip) {\n unclipArea(ctx);\n }\n\n args.cancelable = false;\n this.notifyPlugins('afterDatasetDraw', args);\n }\n\n /**\n * Checks whether the given point is in the chart area.\n * @param {Point} point - in relative coordinates (see, e.g., getRelativePosition)\n * @returns {boolean}\n */\n isPointInArea(point) {\n return _isPointInArea(point, this.chartArea, this._minPadding);\n }\n\n getElementsAtEventForMode(e, mode, options, useFinalPosition) {\n const method = Interaction.modes[mode];\n if (typeof method === 'function') {\n return method(this, e, options, useFinalPosition);\n }\n\n return [];\n }\n\n getDatasetMeta(datasetIndex) {\n const dataset = this.data.datasets[datasetIndex];\n const metasets = this._metasets;\n let meta = metasets.filter(x => x && x._dataset === dataset).pop();\n\n if (!meta) {\n meta = {\n type: null,\n data: [],\n dataset: null,\n controller: null,\n hidden: null,\t\t\t// See isDatasetVisible() comment\n xAxisID: null,\n yAxisID: null,\n order: dataset && dataset.order || 0,\n index: datasetIndex,\n _dataset: dataset,\n _parsed: [],\n _sorted: false\n };\n metasets.push(meta);\n }\n\n return meta;\n }\n\n getContext() {\n return this.$context || (this.$context = createContext(null, {chart: this, type: 'chart'}));\n }\n\n getVisibleDatasetCount() {\n return this.getSortedVisibleDatasetMetas().length;\n }\n\n isDatasetVisible(datasetIndex) {\n const dataset = this.data.datasets[datasetIndex];\n if (!dataset) {\n return false;\n }\n\n const meta = this.getDatasetMeta(datasetIndex);\n\n // meta.hidden is a per chart dataset hidden flag override with 3 states: if true or false,\n // the dataset.hidden value is ignored, else if null, the dataset hidden state is returned.\n return typeof meta.hidden === 'boolean' ? !meta.hidden : !dataset.hidden;\n }\n\n setDatasetVisibility(datasetIndex, visible) {\n const meta = this.getDatasetMeta(datasetIndex);\n meta.hidden = !visible;\n }\n\n toggleDataVisibility(index) {\n this._hiddenIndices[index] = !this._hiddenIndices[index];\n }\n\n getDataVisibility(index) {\n return !this._hiddenIndices[index];\n }\n\n /**\n\t * @private\n\t */\n _updateVisibility(datasetIndex, dataIndex, visible) {\n const mode = visible ? 'show' : 'hide';\n const meta = this.getDatasetMeta(datasetIndex);\n const anims = meta.controller._resolveAnimations(undefined, mode);\n\n if (defined(dataIndex)) {\n meta.data[dataIndex].hidden = !visible;\n this.update();\n } else {\n this.setDatasetVisibility(datasetIndex, visible);\n // Animate visible state, so hide animation can be seen. This could be handled better if update / updateDataset returned a Promise.\n anims.update(meta, {visible});\n this.update((ctx) => ctx.datasetIndex === datasetIndex ? mode : undefined);\n }\n }\n\n hide(datasetIndex, dataIndex) {\n this._updateVisibility(datasetIndex, dataIndex, false);\n }\n\n show(datasetIndex, dataIndex) {\n this._updateVisibility(datasetIndex, dataIndex, true);\n }\n\n /**\n\t * @private\n\t */\n _destroyDatasetMeta(datasetIndex) {\n const meta = this._metasets[datasetIndex];\n if (meta && meta.controller) {\n meta.controller._destroy();\n }\n delete this._metasets[datasetIndex];\n }\n\n _stop() {\n let i, ilen;\n this.stop();\n animator.remove(this);\n\n for (i = 0, ilen = this.data.datasets.length; i < ilen; ++i) {\n this._destroyDatasetMeta(i);\n }\n }\n\n destroy() {\n this.notifyPlugins('beforeDestroy');\n const {canvas, ctx} = this;\n\n this._stop();\n this.config.clearCache();\n\n if (canvas) {\n this.unbindEvents();\n clearCanvas(canvas, ctx);\n this.platform.releaseContext(ctx);\n this.canvas = null;\n this.ctx = null;\n }\n\n delete instances[this.id];\n\n this.notifyPlugins('afterDestroy');\n }\n\n toBase64Image(...args) {\n return this.canvas.toDataURL(...args);\n }\n\n /**\n\t * @private\n\t */\n bindEvents() {\n this.bindUserEvents();\n if (this.options.responsive) {\n this.bindResponsiveEvents();\n } else {\n this.attached = true;\n }\n }\n\n /**\n * @private\n */\n bindUserEvents() {\n const listeners = this._listeners;\n const platform = this.platform;\n\n const _add = (type, listener) => {\n platform.addEventListener(this, type, listener);\n listeners[type] = listener;\n };\n\n const listener = (e, x, y) => {\n e.offsetX = x;\n e.offsetY = y;\n this._eventHandler(e);\n };\n\n each(this.options.events, (type) => _add(type, listener));\n }\n\n /**\n * @private\n */\n bindResponsiveEvents() {\n if (!this._responsiveListeners) {\n this._responsiveListeners = {};\n }\n const listeners = this._responsiveListeners;\n const platform = this.platform;\n\n const _add = (type, listener) => {\n platform.addEventListener(this, type, listener);\n listeners[type] = listener;\n };\n const _remove = (type, listener) => {\n if (listeners[type]) {\n platform.removeEventListener(this, type, listener);\n delete listeners[type];\n }\n };\n\n const listener = (width, height) => {\n if (this.canvas) {\n this.resize(width, height);\n }\n };\n\n let detached; // eslint-disable-line prefer-const\n const attached = () => {\n _remove('attach', attached);\n\n this.attached = true;\n this.resize();\n\n _add('resize', listener);\n _add('detach', detached);\n };\n\n detached = () => {\n this.attached = false;\n\n _remove('resize', listener);\n\n // Stop animating and remove metasets, so when re-attached, the animations start from beginning.\n this._stop();\n this._resize(0, 0);\n\n _add('attach', attached);\n };\n\n if (platform.isAttached(this.canvas)) {\n attached();\n } else {\n detached();\n }\n }\n\n /**\n\t * @private\n\t */\n unbindEvents() {\n each(this._listeners, (listener, type) => {\n this.platform.removeEventListener(this, type, listener);\n });\n this._listeners = {};\n\n each(this._responsiveListeners, (listener, type) => {\n this.platform.removeEventListener(this, type, listener);\n });\n this._responsiveListeners = undefined;\n }\n\n updateHoverStyle(items, mode, enabled) {\n const prefix = enabled ? 'set' : 'remove';\n let meta, item, i, ilen;\n\n if (mode === 'dataset') {\n meta = this.getDatasetMeta(items[0].datasetIndex);\n meta.controller['_' + prefix + 'DatasetHoverStyle']();\n }\n\n for (i = 0, ilen = items.length; i < ilen; ++i) {\n item = items[i];\n const controller = item && this.getDatasetMeta(item.datasetIndex).controller;\n if (controller) {\n controller[prefix + 'HoverStyle'](item.element, item.datasetIndex, item.index);\n }\n }\n }\n\n /**\n\t * Get active (hovered) elements\n\t * @returns array\n\t */\n getActiveElements() {\n return this._active || [];\n }\n\n /**\n\t * Set active (hovered) elements\n\t * @param {array} activeElements New active data points\n\t */\n setActiveElements(activeElements) {\n const lastActive = this._active || [];\n const active = activeElements.map(({datasetIndex, index}) => {\n const meta = this.getDatasetMeta(datasetIndex);\n if (!meta) {\n throw new Error('No dataset found at index ' + datasetIndex);\n }\n\n return {\n datasetIndex,\n element: meta.data[index],\n index,\n };\n });\n const changed = !_elementsEqual(active, lastActive);\n\n if (changed) {\n this._active = active;\n // Make sure we don't use the previous mouse event to override the active elements in update.\n this._lastEvent = null;\n this._updateHoverStyles(active, lastActive);\n }\n }\n\n /**\n\t * Calls enabled plugins on the specified hook and with the given args.\n\t * This method immediately returns as soon as a plugin explicitly returns false. The\n\t * returned value can be used, for instance, to interrupt the current action.\n\t * @param {string} hook - The name of the plugin method to call (e.g. 'beforeUpdate').\n\t * @param {Object} [args] - Extra arguments to apply to the hook call.\n * @param {import('./core.plugins.js').filterCallback} [filter] - Filtering function for limiting which plugins are notified\n\t * @returns {boolean} false if any of the plugins return false, else returns true.\n\t */\n notifyPlugins(hook, args, filter) {\n return this._plugins.notify(this, hook, args, filter);\n }\n\n /**\n * Check if a plugin with the specific ID is registered and enabled\n * @param {string} pluginId - The ID of the plugin of which to check if it is enabled\n * @returns {boolean}\n */\n isPluginEnabled(pluginId) {\n return this._plugins._cache.filter(p => p.plugin.id === pluginId).length === 1;\n }\n\n /**\n\t * @private\n\t */\n _updateHoverStyles(active, lastActive, replay) {\n const hoverOptions = this.options.hover;\n const diff = (a, b) => a.filter(x => !b.some(y => x.datasetIndex === y.datasetIndex && x.index === y.index));\n const deactivated = diff(lastActive, active);\n const activated = replay ? active : diff(active, lastActive);\n\n if (deactivated.length) {\n this.updateHoverStyle(deactivated, hoverOptions.mode, false);\n }\n\n if (activated.length && hoverOptions.mode) {\n this.updateHoverStyle(activated, hoverOptions.mode, true);\n }\n }\n\n /**\n\t * @private\n\t */\n _eventHandler(e, replay) {\n const args = {\n event: e,\n replay,\n cancelable: true,\n inChartArea: this.isPointInArea(e)\n };\n const eventFilter = (plugin) => (plugin.options.events || this.options.events).includes(e.native.type);\n\n if (this.notifyPlugins('beforeEvent', args, eventFilter) === false) {\n return;\n }\n\n const changed = this._handleEvent(e, replay, args.inChartArea);\n\n args.cancelable = false;\n this.notifyPlugins('afterEvent', args, eventFilter);\n\n if (changed || args.changed) {\n this.render();\n }\n\n return this;\n }\n\n /**\n\t * Handle an event\n\t * @param {ChartEvent} e the event to handle\n\t * @param {boolean} [replay] - true if the event was replayed by `update`\n * @param {boolean} [inChartArea] - true if the event is inside chartArea\n\t * @return {boolean} true if the chart needs to re-render\n\t * @private\n\t */\n _handleEvent(e, replay, inChartArea) {\n const {_active: lastActive = [], options} = this;\n\n // If the event is replayed from `update`, we should evaluate with the final positions.\n //\n // The `replay`:\n // It's the last event (excluding click) that has occurred before `update`.\n // So mouse has not moved. It's also over the chart, because there is a `replay`.\n //\n // The why:\n // If animations are active, the elements haven't moved yet compared to state before update.\n // But if they will, we are activating the elements that would be active, if this check\n // was done after the animations have completed. => \"final positions\".\n // If there is no animations, the \"final\" and \"current\" positions are equal.\n // This is done so we do not have to evaluate the active elements each animation frame\n // - it would be expensive.\n const useFinalPosition = replay;\n const active = this._getActiveElements(e, lastActive, inChartArea, useFinalPosition);\n const isClick = _isClickEvent(e);\n const lastEvent = determineLastEvent(e, this._lastEvent, inChartArea, isClick);\n\n if (inChartArea) {\n // Set _lastEvent to null while we are processing the event handlers.\n // This prevents recursion if the handler calls chart.update()\n this._lastEvent = null;\n\n // Invoke onHover hook\n callCallback(options.onHover, [e, active, this], this);\n\n if (isClick) {\n callCallback(options.onClick, [e, active, this], this);\n }\n }\n\n const changed = !_elementsEqual(active, lastActive);\n if (changed || replay) {\n this._active = active;\n this._updateHoverStyles(active, lastActive, replay);\n }\n\n this._lastEvent = lastEvent;\n\n return changed;\n }\n\n /**\n * @param {ChartEvent} e - The event\n * @param {import('../types/index.js').ActiveElement[]} lastActive - Previously active elements\n * @param {boolean} inChartArea - Is the envent inside chartArea\n * @param {boolean} useFinalPosition - Should the evaluation be done with current or final (after animation) element positions\n * @returns {import('../types/index.js').ActiveElement[]} - The active elements\n * @pravate\n */\n _getActiveElements(e, lastActive, inChartArea, useFinalPosition) {\n if (e.type === 'mouseout') {\n return [];\n }\n\n if (!inChartArea) {\n // Let user control the active elements outside chartArea. Eg. using Legend.\n return lastActive;\n }\n\n const hoverOptions = this.options.hover;\n return this.getElementsAtEventForMode(e, hoverOptions.mode, hoverOptions, useFinalPosition);\n }\n}\n\n// @ts-ignore\nfunction invalidatePlugins() {\n return each(Chart.instances, (chart) => chart._plugins.invalidate());\n}\n\nexport default Chart;\n","/**\n * @namespace Chart._adapters\n * @since 2.8.0\n * @private\n */\n\nimport type {AnyObject} from '../types/basic.js';\nimport type {ChartOptions} from '../types/index.js';\n\nexport type TimeUnit = 'millisecond' | 'second' | 'minute' | 'hour' | 'day' | 'week' | 'month' | 'quarter' | 'year';\n\nexport interface DateAdapter {\n readonly options: T;\n /**\n * Will called with chart options after adapter creation.\n */\n init(this: DateAdapter, chartOptions: ChartOptions): void;\n /**\n * Returns a map of time formats for the supported formatting units defined\n * in Unit as well as 'datetime' representing a detailed date/time string.\n */\n formats(this: DateAdapter): Record;\n /**\n * Parses the given `value` and return the associated timestamp.\n * @param value - the value to parse (usually comes from the data)\n * @param [format] - the expected data format\n */\n parse(this: DateAdapter, value: unknown, format?: TimeUnit): number | null;\n /**\n * Returns the formatted date in the specified `format` for a given `timestamp`.\n * @param timestamp - the timestamp to format\n * @param format - the date/time token\n */\n format(this: DateAdapter, timestamp: number, format: TimeUnit): string;\n /**\n * Adds the specified `amount` of `unit` to the given `timestamp`.\n * @param timestamp - the input timestamp\n * @param amount - the amount to add\n * @param unit - the unit as string\n */\n add(this: DateAdapter, timestamp: number, amount: number, unit: TimeUnit): number;\n /**\n * Returns the number of `unit` between the given timestamps.\n * @param a - the input timestamp (reference)\n * @param b - the timestamp to subtract\n * @param unit - the unit as string\n */\n diff(this: DateAdapter
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