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helpers.chart.js
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helpers.chart.js
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import {isFinite, toPadding} from 'chart.js/helpers';
import {measureLabelSize} from './helpers.canvas';
import {isBoundToPoint, getRelativePosition, toPosition, initAnimationProperties} from './helpers.options';
const limitedLineScale = {
xScaleID: {min: 'xMin', max: 'xMax', start: 'left', end: 'right', startProp: 'x', endProp: 'x2'},
yScaleID: {min: 'yMin', max: 'yMax', start: 'bottom', end: 'top', startProp: 'y', endProp: 'y2'}
};
/**
* @typedef { import("chart.js").Chart } Chart
* @typedef { import("chart.js").Scale } Scale
* @typedef { import("chart.js").Point } Point
* @typedef { import('../../types/element').AnnotationBoxModel } AnnotationBoxModel
* @typedef { import('../../types/options').CoreAnnotationOptions } CoreAnnotationOptions
* @typedef { import('../../types/options').LineAnnotationOptions } LineAnnotationOptions
* @typedef { import('../../types/options').PointAnnotationOptions } PointAnnotationOptions
* @typedef { import('../../types/options').PolygonAnnotationOptions } PolygonAnnotationOptions
*/
/**
* @param {Scale} scale
* @param {number|string} value
* @param {number} fallback
* @returns {number}
*/
export function scaleValue(scale, value, fallback) {
value = typeof value === 'number' ? value : scale.parse(value);
return isFinite(value) ? scale.getPixelForValue(value) : fallback;
}
/**
* Search the scale defined in chartjs by the axis related to the annotation options key.
* @param {{ [key: string]: Scale }} scales
* @param {CoreAnnotationOptions} options
* @param {string} key
* @returns {string}
*/
export function retrieveScaleID(scales, options, key) {
const scaleID = options[key];
if (scaleID || key === 'scaleID') {
return scaleID;
}
const axis = key.charAt(0);
const axes = Object.values(scales).filter((scale) => scale.axis && scale.axis === axis);
if (axes.length) {
return axes[0].id;
}
return axis;
}
/**
* @param {Scale} scale
* @param {{min: number, max: number, start: number, end: number}} options
* @returns {{start: number, end: number}|undefined}
*/
export function getDimensionByScale(scale, options) {
if (scale) {
const reverse = scale.options.reverse;
const start = scaleValue(scale, options.min, reverse ? options.end : options.start);
const end = scaleValue(scale, options.max, reverse ? options.start : options.end);
return {
start,
end
};
}
}
/**
* @param {Chart} chart
* @param {CoreAnnotationOptions} options
* @returns {Point}
*/
export function getChartPoint(chart, options) {
const {chartArea, scales} = chart;
const xScale = scales[retrieveScaleID(scales, options, 'xScaleID')];
const yScale = scales[retrieveScaleID(scales, options, 'yScaleID')];
let x = chartArea.width / 2;
let y = chartArea.height / 2;
if (xScale) {
x = scaleValue(xScale, options.xValue, xScale.left + xScale.width / 2);
}
if (yScale) {
y = scaleValue(yScale, options.yValue, yScale.top + yScale.height / 2);
}
return {x, y};
}
/**
* @param {Chart} chart
* @param {CoreAnnotationOptions} options
* @returns {AnnotationBoxModel}
*/
export function resolveBoxProperties(chart, options) {
const scales = chart.scales;
const xScale = scales[retrieveScaleID(scales, options, 'xScaleID')];
const yScale = scales[retrieveScaleID(scales, options, 'yScaleID')];
if (!xScale && !yScale) {
return {};
}
let {left: x, right: x2} = xScale || chart.chartArea;
let {top: y, bottom: y2} = yScale || chart.chartArea;
const xDim = getChartDimensionByScale(xScale, {min: options.xMin, max: options.xMax, start: x, end: x2});
x = xDim.start;
x2 = xDim.end;
const yDim = getChartDimensionByScale(yScale, {min: options.yMin, max: options.yMax, start: y2, end: y});
y = yDim.start;
y2 = yDim.end;
return {
x,
y,
x2,
y2,
width: x2 - x,
height: y2 - y,
centerX: x + (x2 - x) / 2,
centerY: y + (y2 - y) / 2
};
}
/**
* @param {Chart} chart
* @param {PointAnnotationOptions|PolygonAnnotationOptions} options
* @returns {AnnotationBoxModel}
*/
export function resolvePointProperties(chart, options) {
if (!isBoundToPoint(options)) {
const box = resolveBoxProperties(chart, options);
let radius = options.radius;
if (!radius || isNaN(radius)) {
radius = Math.min(box.width, box.height) / 2;
options.radius = radius;
}
const size = radius * 2;
const adjustCenterX = box.centerX + options.xAdjust;
const adjustCenterY = box.centerY + options.yAdjust;
return {
x: adjustCenterX - radius,
y: adjustCenterY - radius,
x2: adjustCenterX + radius,
y2: adjustCenterY + radius,
centerX: adjustCenterX,
centerY: adjustCenterY,
width: size,
height: size,
radius
};
}
return getChartCircle(chart, options);
}
/**
* @param {Chart} chart
* @param {LineAnnotationOptions} options
* @returns {AnnotationBoxModel}
*/
export function resolveLineProperties(chart, options) {
const {scales, chartArea} = chart;
const scale = scales[options.scaleID];
const area = {x: chartArea.left, y: chartArea.top, x2: chartArea.right, y2: chartArea.bottom};
if (scale) {
resolveFullLineProperties(scale, area, options);
} else {
resolveLimitedLineProperties(scales, area, options);
}
return area;
}
/**
* @param {Chart} chart
* @param {CoreAnnotationOptions} options
* @param {boolean} [centerBased=false]
* @returns {AnnotationBoxModel}
*/
export function resolveBoxAndLabelProperties(chart, options) {
const properties = resolveBoxProperties(chart, options);
properties.initProperties = initAnimationProperties(chart, properties, options);
properties.elements = [{
type: 'label',
optionScope: 'label',
properties: resolveLabelElementProperties(chart, properties, options),
initProperties: properties.initProperties
}];
return properties;
}
function getChartCircle(chart, options) {
const point = getChartPoint(chart, options);
const size = options.radius * 2;
return {
x: point.x - options.radius + options.xAdjust,
y: point.y - options.radius + options.yAdjust,
x2: point.x + options.radius + options.xAdjust,
y2: point.y + options.radius + options.yAdjust,
centerX: point.x + options.xAdjust,
centerY: point.y + options.yAdjust,
radius: options.radius,
width: size,
height: size
};
}
function getChartDimensionByScale(scale, options) {
const result = getDimensionByScale(scale, options) || options;
return {
start: Math.min(result.start, result.end),
end: Math.max(result.start, result.end)
};
}
function resolveFullLineProperties(scale, area, options) {
const min = scaleValue(scale, options.value, NaN);
const max = scaleValue(scale, options.endValue, min);
if (scale.isHorizontal()) {
area.x = min;
area.x2 = max;
} else {
area.y = min;
area.y2 = max;
}
}
function resolveLimitedLineProperties(scales, area, options) {
for (const scaleId of Object.keys(limitedLineScale)) {
const scale = scales[retrieveScaleID(scales, options, scaleId)];
if (scale) {
const {min, max, start, end, startProp, endProp} = limitedLineScale[scaleId];
const dim = getDimensionByScale(scale, {min: options[min], max: options[max], start: scale[start], end: scale[end]});
area[startProp] = dim.start;
area[endProp] = dim.end;
}
}
}
function calculateX({properties, options}, labelSize, position, padding) {
const {x: start, x2: end, width: size} = properties;
return calculatePosition({start, end, size, borderWidth: options.borderWidth}, {
position: position.x,
padding: {start: padding.left, end: padding.right},
adjust: options.label.xAdjust,
size: labelSize.width
});
}
function calculateY({properties, options}, labelSize, position, padding) {
const {y: start, y2: end, height: size} = properties;
return calculatePosition({start, end, size, borderWidth: options.borderWidth}, {
position: position.y,
padding: {start: padding.top, end: padding.bottom},
adjust: options.label.yAdjust,
size: labelSize.height
});
}
function calculatePosition(boxOpts, labelOpts) {
const {start, end, borderWidth} = boxOpts;
const {position, padding: {start: padStart, end: padEnd}, adjust} = labelOpts;
const availableSize = end - borderWidth - start - padStart - padEnd - labelOpts.size;
return start + borderWidth / 2 + adjust + getRelativePosition(availableSize, position);
}
function resolveLabelElementProperties(chart, properties, options) {
const label = options.label;
label.backgroundColor = 'transparent';
label.callout.display = false;
const position = toPosition(label.position);
const padding = toPadding(label.padding);
const labelSize = measureLabelSize(chart.ctx, label);
const x = calculateX({properties, options}, labelSize, position, padding);
const y = calculateY({properties, options}, labelSize, position, padding);
const width = labelSize.width + padding.width;
const height = labelSize.height + padding.height;
return {
x,
y,
x2: x + width,
y2: y + height,
width,
height,
centerX: x + width / 2,
centerY: y + height / 2,
rotation: label.rotation
};
}