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2092 lines
60 KiB
2092 lines
60 KiB
/*!
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* chartjs-plugin-annotation v1.4.0
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* https://www.chartjs.org/chartjs-plugin-annotation/index
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* (c) 2022 chartjs-plugin-annotation Contributors
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* Released under the MIT License
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*/
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import { Element, defaults, Animations, Chart } from 'chart.js';
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import { defined, distanceBetweenPoints, callback, isFinite, valueOrDefault, isObject, toRadians, toFont, isArray, addRoundedRectPath, toTRBLCorners, toPadding, PI, drawPoint, RAD_PER_DEG, clipArea, unclipArea } from 'chart.js/helpers';
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const clickHooks = ['click', 'dblclick'];
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const moveHooks = ['enter', 'leave'];
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const hooks = clickHooks.concat(moveHooks);
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function updateListeners(chart, state, options) {
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state.listened = false;
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state.moveListened = false;
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hooks.forEach(hook => {
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if (typeof options[hook] === 'function') {
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state.listened = true;
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state.listeners[hook] = options[hook];
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} else if (defined(state.listeners[hook])) {
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delete state.listeners[hook];
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}
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});
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moveHooks.forEach(hook => {
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if (typeof options[hook] === 'function') {
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state.moveListened = true;
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}
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});
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if (!state.listened || !state.moveListened) {
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state.annotations.forEach(scope => {
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if (!state.listened) {
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clickHooks.forEach(hook => {
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if (typeof scope[hook] === 'function') {
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state.listened = true;
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}
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});
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}
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if (!state.moveListened) {
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moveHooks.forEach(hook => {
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if (typeof scope[hook] === 'function') {
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state.listened = true;
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state.moveListened = true;
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}
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});
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}
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});
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}
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}
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function handleEvent(state, event, options) {
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if (state.listened) {
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switch (event.type) {
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case 'mousemove':
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case 'mouseout':
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handleMoveEvents(state, event);
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break;
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case 'click':
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handleClickEvents(state, event, options);
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break;
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}
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}
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}
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function handleMoveEvents(state, event) {
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if (!state.moveListened) {
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return;
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}
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let element;
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if (event.type === 'mousemove') {
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element = getNearestItem(state.elements, event);
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}
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const previous = state.hovered;
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state.hovered = element;
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dispatchMoveEvents(state, {previous, element}, event);
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}
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function dispatchMoveEvents(state, elements, event) {
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const {previous, element} = elements;
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if (previous && previous !== element) {
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dispatchEvent(previous.options.leave || state.listeners.leave, previous, event);
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}
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if (element && element !== previous) {
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dispatchEvent(element.options.enter || state.listeners.enter, element, event);
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}
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}
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function handleClickEvents(state, event, options) {
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const listeners = state.listeners;
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const element = getNearestItem(state.elements, event);
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if (element) {
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const elOpts = element.options;
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const dblclick = elOpts.dblclick || listeners.dblclick;
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const click = elOpts.click || listeners.click;
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if (element.clickTimeout) {
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// 2nd click before timeout, so its a double click
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clearTimeout(element.clickTimeout);
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delete element.clickTimeout;
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dispatchEvent(dblclick, element, event);
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} else if (dblclick) {
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// if there is a dblclick handler, wait for dblClickSpeed ms before deciding its a click
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element.clickTimeout = setTimeout(() => {
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delete element.clickTimeout;
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dispatchEvent(click, element, event);
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}, options.dblClickSpeed);
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} else {
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// no double click handler, just call the click handler directly
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dispatchEvent(click, element, event);
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}
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}
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}
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function dispatchEvent(handler, element, event) {
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callback(handler, [element.$context, event]);
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}
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function getNearestItem(elements, position) {
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let minDistance = Number.POSITIVE_INFINITY;
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return elements
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.filter((element) => element.options.display && element.inRange(position.x, position.y))
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.reduce((nearestItems, element) => {
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const center = element.getCenterPoint();
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const distance = distanceBetweenPoints(position, center);
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if (distance < minDistance) {
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nearestItems = [element];
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minDistance = distance;
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} else if (distance === minDistance) {
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// Can have multiple items at the same distance in which case we sort by size
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nearestItems.push(element);
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}
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return nearestItems;
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}, [])
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.sort((a, b) => a._index - b._index)
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.slice(0, 1)[0]; // return only the top item
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}
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function adjustScaleRange(chart, scale, annotations) {
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const range = getScaleLimits(scale, annotations);
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let changed = changeScaleLimit(scale, range, 'min', 'suggestedMin');
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changed = changeScaleLimit(scale, range, 'max', 'suggestedMax') || changed;
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if (changed && typeof scale.handleTickRangeOptions === 'function') {
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scale.handleTickRangeOptions();
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}
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}
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function verifyScaleOptions(annotations, scales) {
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for (const annotation of annotations) {
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verifyScaleIDs(annotation, scales);
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}
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}
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function changeScaleLimit(scale, range, limit, suggestedLimit) {
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if (isFinite(range[limit]) && !scaleLimitDefined(scale.options, limit, suggestedLimit)) {
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const changed = scale[limit] !== range[limit];
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scale[limit] = range[limit];
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return changed;
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}
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}
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function scaleLimitDefined(scaleOptions, limit, suggestedLimit) {
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return defined(scaleOptions[limit]) || defined(scaleOptions[suggestedLimit]);
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}
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function verifyScaleIDs(annotation, scales) {
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for (const key of ['scaleID', 'xScaleID', 'yScaleID']) {
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if (annotation[key] && !scales[annotation[key]] && verifyProperties(annotation, key)) {
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console.warn(`No scale found with id '${annotation[key]}' for annotation '${annotation.id}'`);
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}
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}
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}
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function verifyProperties(annotation, key) {
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if (key === 'scaleID') {
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return true;
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}
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const axis = key.charAt(0);
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for (const prop of ['Min', 'Max', 'Value']) {
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if (defined(annotation[axis + prop])) {
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return true;
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}
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}
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return false;
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}
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function getScaleLimits(scale, annotations) {
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const axis = scale.axis;
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const scaleID = scale.id;
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const scaleIDOption = axis + 'ScaleID';
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const limits = {
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min: valueOrDefault(scale.min, Number.NEGATIVE_INFINITY),
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max: valueOrDefault(scale.max, Number.POSITIVE_INFINITY)
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};
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for (const annotation of annotations) {
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if (annotation.scaleID === scaleID) {
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updateLimits(annotation, scale, ['value', 'endValue'], limits);
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} else if (annotation[scaleIDOption] === scaleID) {
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updateLimits(annotation, scale, [axis + 'Min', axis + 'Max', axis + 'Value'], limits);
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}
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}
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return limits;
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}
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function updateLimits(annotation, scale, props, limits) {
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for (const prop of props) {
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const raw = annotation[prop];
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if (defined(raw)) {
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const value = scale.parse(raw);
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limits.min = Math.min(limits.min, value);
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limits.max = Math.max(limits.max, value);
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}
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}
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}
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const EPSILON = 0.001;
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const clamp = (x, from, to) => Math.min(to, Math.max(from, x));
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function clampAll(obj, from, to) {
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for (const key of Object.keys(obj)) {
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obj[key] = clamp(obj[key], from, to);
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}
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return obj;
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}
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function inPointRange(point, center, radius, borderWidth) {
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if (!point || !center || radius <= 0) {
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return false;
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}
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const hBorderWidth = borderWidth / 2 || 0;
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return (Math.pow(point.x - center.x, 2) + Math.pow(point.y - center.y, 2)) <= Math.pow(radius + hBorderWidth, 2);
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}
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function inBoxRange(mouseX, mouseY, {x, y, width, height}, borderWidth) {
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const hBorderWidth = borderWidth / 2;
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return mouseX >= x - hBorderWidth - EPSILON &&
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mouseX <= x + width + hBorderWidth + EPSILON &&
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mouseY >= y - hBorderWidth - EPSILON &&
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mouseY <= y + height + hBorderWidth + EPSILON;
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}
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function getElementCenterPoint(element, useFinalPosition) {
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const {x, y} = element.getProps(['x', 'y'], useFinalPosition);
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return {x, y};
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}
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const isOlderPart = (act, req) => req > act || (act.length > req.length && act.substr(0, req.length) === req);
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function requireVersion(pkg, min, ver, strict = true) {
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const parts = ver.split('.');
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let i = 0;
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for (const req of min.split('.')) {
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const act = parts[i++];
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if (parseInt(req, 10) < parseInt(act, 10)) {
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break;
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}
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if (isOlderPart(act, req)) {
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if (strict) {
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throw new Error(`${pkg} v${ver} is not supported. v${min} or newer is required.`);
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} else {
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return false;
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}
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}
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}
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return true;
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}
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const isPercentString = (s) => typeof s === 'string' && s.endsWith('%');
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const toPercent = (s) => clamp(parseFloat(s) / 100, 0, 1);
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function getRelativePosition(size, positionOption) {
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if (positionOption === 'start') {
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return 0;
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}
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if (positionOption === 'end') {
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return size;
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}
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if (isPercentString(positionOption)) {
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return toPercent(positionOption) * size;
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}
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return size / 2;
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}
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function getSize(size, value) {
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if (typeof value === 'number') {
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return value;
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} else if (isPercentString(value)) {
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return toPercent(value) * size;
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}
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return size;
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}
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function calculateTextAlignment(size, options) {
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const {x, width} = size;
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const textAlign = options.textAlign;
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if (textAlign === 'center') {
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return x + width / 2;
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} else if (textAlign === 'end' || textAlign === 'right') {
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return x + width;
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}
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return x;
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}
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function toPosition(value) {
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if (isObject(value)) {
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return {
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x: valueOrDefault(value.x, 'center'),
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y: valueOrDefault(value.y, 'center'),
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};
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}
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value = valueOrDefault(value, 'center');
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return {
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x: value,
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y: value
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};
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}
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function isBoundToPoint(options) {
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return options && (defined(options.xValue) || defined(options.yValue));
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}
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const widthCache = new Map();
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/**
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* Determine if content is an image or a canvas.
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* @param {*} content
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* @returns boolean|undefined
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* @todo move this function to chart.js helpers
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*/
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function isImageOrCanvas(content) {
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if (content && typeof content === 'object') {
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const type = content.toString();
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return (type === '[object HTMLImageElement]' || type === '[object HTMLCanvasElement]');
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}
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}
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/**
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* Set the translation on the canvas if the rotation must be applied.
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* @param {CanvasRenderingContext2D} ctx - chart canvas context
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* @param {Element} element - annotation element to use for applying the translation
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* @param {number} rotation - rotation (in degrees) to apply
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*/
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function translate(ctx, element, rotation) {
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if (rotation) {
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const center = element.getCenterPoint();
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ctx.translate(center.x, center.y);
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ctx.rotate(toRadians(rotation));
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ctx.translate(-center.x, -center.y);
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}
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}
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/**
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* Apply border options to the canvas context before drawing a shape
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* @param {CanvasRenderingContext2D} ctx - chart canvas context
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* @param {Object} options - options with border configuration
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* @returns {boolean} true is the border options have been applied
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*/
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function setBorderStyle(ctx, options) {
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if (options && options.borderWidth) {
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ctx.lineCap = options.borderCapStyle;
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ctx.setLineDash(options.borderDash);
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ctx.lineDashOffset = options.borderDashOffset;
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ctx.lineJoin = options.borderJoinStyle;
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ctx.lineWidth = options.borderWidth;
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ctx.strokeStyle = options.borderColor;
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return true;
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}
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}
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/**
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* Apply shadow options to the canvas context before drawing a shape
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* @param {CanvasRenderingContext2D} ctx - chart canvas context
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* @param {Object} options - options with shadow configuration
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*/
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function setShadowStyle(ctx, options) {
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ctx.shadowColor = options.backgroundShadowColor;
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ctx.shadowBlur = options.shadowBlur;
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ctx.shadowOffsetX = options.shadowOffsetX;
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ctx.shadowOffsetY = options.shadowOffsetY;
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}
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/**
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* Measure the label size using the label options.
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* @param {CanvasRenderingContext2D} ctx - chart canvas context
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* @param {Object} options - options to configure the label
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* @returns {{width: number, height: number}} the measured size of the label
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*/
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function measureLabelSize(ctx, options) {
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const content = options.content;
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if (isImageOrCanvas(content)) {
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return {
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width: getSize(content.width, options.width),
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height: getSize(content.height, options.height)
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};
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}
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const font = toFont(options.font);
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const strokeWidth = options.textStrokeWidth;
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const lines = isArray(content) ? content : [content];
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const mapKey = lines.join() + font.string + strokeWidth + (ctx._measureText ? '-spriting' : '');
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if (!widthCache.has(mapKey)) {
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ctx.save();
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ctx.font = font.string;
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const count = lines.length;
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let width = 0;
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for (let i = 0; i < count; i++) {
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const text = lines[i];
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width = Math.max(width, ctx.measureText(text).width + strokeWidth);
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}
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ctx.restore();
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const height = count * font.lineHeight + strokeWidth;
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widthCache.set(mapKey, {width, height});
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}
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return widthCache.get(mapKey);
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}
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/**
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* Draw a box with the size and the styling options.
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* @param {CanvasRenderingContext2D} ctx - chart canvas context
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* @param {{x: number, y: number, width: number, height: number}} rect - rect to draw
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* @param {Object} options - options to style the box
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* @returns {undefined}
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*/
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function drawBox(ctx, rect, options) {
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const {x, y, width, height} = rect;
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ctx.save();
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setShadowStyle(ctx, options);
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const stroke = setBorderStyle(ctx, options);
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ctx.fillStyle = options.backgroundColor;
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ctx.beginPath();
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addRoundedRectPath(ctx, {
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x, y, w: width, h: height,
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// TODO: v2 remove support for cornerRadius
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radius: clampAll(toTRBLCorners(valueOrDefault(options.cornerRadius, options.borderRadius)), 0, Math.min(width, height) / 2)
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});
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ctx.closePath();
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ctx.fill();
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if (stroke) {
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ctx.shadowColor = options.borderShadowColor;
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ctx.stroke();
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}
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ctx.restore();
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}
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/**
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* Draw a label with the size and the styling options.
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* @param {CanvasRenderingContext2D} ctx - chart canvas context
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* @param {{x: number, y: number, width: number, height: number}} rect - rect to map teh label
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* @param {Object} options - options to style the label
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* @returns {undefined}
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*/
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function drawLabel(ctx, rect, options) {
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const content = options.content;
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if (isImageOrCanvas(content)) {
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ctx.drawImage(content, rect.x, rect.y, rect.width, rect.height);
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return;
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}
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const labels = isArray(content) ? content : [content];
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const font = toFont(options.font);
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const lh = font.lineHeight;
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const x = calculateTextAlignment(rect, options);
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const y = rect.y + (lh / 2) + options.textStrokeWidth / 2;
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ctx.save();
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ctx.font = font.string;
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ctx.textBaseline = 'middle';
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ctx.textAlign = options.textAlign;
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if (setTextStrokeStyle(ctx, options)) {
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labels.forEach((l, i) => ctx.strokeText(l, x, y + (i * lh)));
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}
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ctx.fillStyle = options.color;
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labels.forEach((l, i) => ctx.fillText(l, x, y + (i * lh)));
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ctx.restore();
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}
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function setTextStrokeStyle(ctx, options) {
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if (options.textStrokeWidth > 0) {
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// https://stackoverflow.com/questions/13627111/drawing-text-with-an-outer-stroke-with-html5s-canvas
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ctx.lineJoin = 'round';
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ctx.miterLimit = 2;
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ctx.lineWidth = options.textStrokeWidth;
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ctx.strokeStyle = options.textStrokeColor;
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return true;
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}
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}
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|
|
/**
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* @typedef {import('chart.js').Point} Point
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|
*/
|
|
|
|
/**
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* @param {{x: number, y: number, width: number, height: number}} rect
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|
* @returns {Point}
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|
*/
|
|
function getRectCenterPoint(rect) {
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const {x, y, width, height} = rect;
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return {
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x: x + width / 2,
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y: y + height / 2
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};
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}
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|
|
|
/**
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* Rotate a `point` relative to `center` point by `angle`
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* @param {Point} point - the point to rotate
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* @param {Point} center - center point for rotation
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* @param {number} angle - angle for rotation, in radians
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* @returns {Point} rotated point
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*/
|
|
function rotated(point, center, angle) {
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const cos = Math.cos(angle);
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const sin = Math.sin(angle);
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const cx = center.x;
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const cy = center.y;
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|
|
return {
|
|
x: cx + cos * (point.x - cx) - sin * (point.y - cy),
|
|
y: cy + sin * (point.x - cx) + cos * (point.y - cy)
|
|
};
|
|
}
|
|
|
|
/**
|
|
* @typedef { import("chart.js").Chart } Chart
|
|
* @typedef { import("chart.js").Scale } Scale
|
|
* @typedef { import("chart.js").Point } Point
|
|
* @typedef { import('../../types/options').CoreAnnotationOptions } CoreAnnotationOptions
|
|
* @typedef { import('../../types/options').PointAnnotationOptions } PointAnnotationOptions
|
|
*/
|
|
|
|
/**
|
|
* @param {Scale} scale
|
|
* @param {number|string} value
|
|
* @param {number} fallback
|
|
* @returns {number}
|
|
*/
|
|
function scaleValue(scale, value, fallback) {
|
|
value = typeof value === 'number' ? value : scale.parse(value);
|
|
return isFinite(value) ? scale.getPixelForValue(value) : fallback;
|
|
}
|
|
|
|
/**
|
|
* @param {Scale} scale
|
|
* @param {{start: number, end: number}} options
|
|
* @returns {{start: number, end: number}}
|
|
*/
|
|
function getChartDimensionByScale(scale, options) {
|
|
if (scale) {
|
|
const min = scaleValue(scale, options.min, options.start);
|
|
const max = scaleValue(scale, options.max, options.end);
|
|
return {
|
|
start: Math.min(min, max),
|
|
end: Math.max(min, max)
|
|
};
|
|
}
|
|
return {
|
|
start: options.start,
|
|
end: options.end
|
|
};
|
|
}
|
|
|
|
/**
|
|
* @param {Chart} chart
|
|
* @param {CoreAnnotationOptions} options
|
|
* @returns {Point}
|
|
*/
|
|
function getChartPoint(chart, options) {
|
|
const {chartArea, scales} = chart;
|
|
const xScale = scales[options.xScaleID];
|
|
const yScale = scales[options.yScaleID];
|
|
let x = chartArea.width / 2;
|
|
let y = chartArea.height / 2;
|
|
|
|
if (xScale) {
|
|
x = scaleValue(xScale, options.xValue, x);
|
|
}
|
|
|
|
if (yScale) {
|
|
y = scaleValue(yScale, options.yValue, y);
|
|
}
|
|
return {x, y};
|
|
}
|
|
|
|
/**
|
|
* @param {Chart} chart
|
|
* @param {CoreAnnotationOptions} options
|
|
* @returns {{x?:number, y?: number, x2?: number, y2?: number, width?: number, height?: number}}
|
|
*/
|
|
function getChartRect(chart, options) {
|
|
const xScale = chart.scales[options.xScaleID];
|
|
const yScale = chart.scales[options.yScaleID];
|
|
let {top: y, left: x, bottom: y2, right: x2} = chart.chartArea;
|
|
|
|
if (!xScale && !yScale) {
|
|
return {};
|
|
}
|
|
|
|
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: y, end: y2});
|
|
y = yDim.start;
|
|
y2 = yDim.end;
|
|
|
|
return {
|
|
x,
|
|
y,
|
|
x2,
|
|
y2,
|
|
width: x2 - x,
|
|
height: y2 - y
|
|
};
|
|
}
|
|
|
|
/**
|
|
* @param {Chart} chart
|
|
* @param {PointAnnotationOptions} options
|
|
*/
|
|
function getChartCircle(chart, options) {
|
|
const point = getChartPoint(chart, options);
|
|
return {
|
|
x: point.x + options.xAdjust,
|
|
y: point.y + options.yAdjust,
|
|
width: options.radius * 2,
|
|
height: options.radius * 2
|
|
};
|
|
}
|
|
|
|
/**
|
|
* @param {Chart} chart
|
|
* @param {PointAnnotationOptions} options
|
|
* @returns
|
|
*/
|
|
function resolvePointPosition(chart, options) {
|
|
if (!isBoundToPoint(options)) {
|
|
const box = getChartRect(chart, options);
|
|
const point = getRectCenterPoint(box);
|
|
let radius = options.radius;
|
|
if (!radius || isNaN(radius)) {
|
|
radius = Math.min(box.width, box.height) / 2;
|
|
options.radius = radius;
|
|
}
|
|
return {
|
|
x: point.x + options.xAdjust,
|
|
y: point.y + options.yAdjust,
|
|
width: radius * 2,
|
|
height: radius * 2
|
|
};
|
|
}
|
|
return getChartCircle(chart, options);
|
|
}
|
|
|
|
class BoxAnnotation extends Element {
|
|
inRange(mouseX, mouseY, useFinalPosition) {
|
|
const {x, y} = rotated({x: mouseX, y: mouseY}, this.getCenterPoint(useFinalPosition), toRadians(-this.options.rotation));
|
|
return inBoxRange(x, y, this.getProps(['x', 'y', 'width', 'height'], useFinalPosition), this.options.borderWidth);
|
|
}
|
|
|
|
getCenterPoint(useFinalPosition) {
|
|
return getRectCenterPoint(this.getProps(['x', 'y', 'width', 'height'], useFinalPosition));
|
|
}
|
|
|
|
draw(ctx) {
|
|
ctx.save();
|
|
translate(ctx, this, this.options.rotation);
|
|
drawBox(ctx, this, this.options);
|
|
ctx.restore();
|
|
}
|
|
|
|
drawLabel(ctx) {
|
|
const {x, y, width, height, options} = this;
|
|
const {label, borderWidth} = options;
|
|
const halfBorder = borderWidth / 2;
|
|
const position = toPosition(label.position);
|
|
const padding = toPadding(label.padding);
|
|
const labelSize = measureLabelSize(ctx, label);
|
|
const labelRect = {
|
|
x: calculateX(this, labelSize, position, padding),
|
|
y: calculateY(this, labelSize, position, padding),
|
|
width: labelSize.width,
|
|
height: labelSize.height
|
|
};
|
|
|
|
ctx.save();
|
|
translate(ctx, this, label.rotation);
|
|
ctx.beginPath();
|
|
ctx.rect(x + halfBorder + padding.left, y + halfBorder + padding.top,
|
|
width - borderWidth - padding.width, height - borderWidth - padding.height);
|
|
ctx.clip();
|
|
drawLabel(ctx, labelRect, label);
|
|
ctx.restore();
|
|
}
|
|
|
|
resolveElementProperties(chart, options) {
|
|
return getChartRect(chart, options);
|
|
}
|
|
}
|
|
|
|
BoxAnnotation.id = 'boxAnnotation';
|
|
|
|
BoxAnnotation.defaults = {
|
|
adjustScaleRange: true,
|
|
backgroundShadowColor: 'transparent',
|
|
borderCapStyle: 'butt',
|
|
borderDash: [],
|
|
borderDashOffset: 0,
|
|
borderJoinStyle: 'miter',
|
|
borderRadius: 0,
|
|
borderShadowColor: 'transparent',
|
|
borderWidth: 1,
|
|
cornerRadius: undefined, // TODO: v2 remove support for cornerRadius
|
|
display: true,
|
|
label: {
|
|
borderWidth: undefined,
|
|
color: 'black',
|
|
content: null,
|
|
drawTime: undefined,
|
|
enabled: false,
|
|
font: {
|
|
family: undefined,
|
|
lineHeight: undefined,
|
|
size: undefined,
|
|
style: undefined,
|
|
weight: 'bold'
|
|
},
|
|
height: undefined,
|
|
padding: 6,
|
|
position: 'center',
|
|
rotation: undefined,
|
|
textAlign: 'start',
|
|
textStrokeColor: undefined,
|
|
textStrokeWidth: 0,
|
|
xAdjust: 0,
|
|
yAdjust: 0,
|
|
width: undefined
|
|
},
|
|
rotation: 0,
|
|
shadowBlur: 0,
|
|
shadowOffsetX: 0,
|
|
shadowOffsetY: 0,
|
|
xMax: undefined,
|
|
xMin: undefined,
|
|
xScaleID: 'x',
|
|
yMax: undefined,
|
|
yMin: undefined,
|
|
yScaleID: 'y'
|
|
};
|
|
|
|
BoxAnnotation.defaultRoutes = {
|
|
borderColor: 'color',
|
|
backgroundColor: 'color'
|
|
};
|
|
|
|
BoxAnnotation.descriptors = {
|
|
label: {
|
|
_fallback: true
|
|
}
|
|
};
|
|
|
|
function calculateX(box, labelSize, position, padding) {
|
|
const {x: start, x2: end, width: size, options} = box;
|
|
const {xAdjust: adjust, borderWidth} = options.label;
|
|
return calculatePosition$1({start, end, size}, {
|
|
position: position.x,
|
|
padding: {start: padding.left, end: padding.right},
|
|
adjust, borderWidth,
|
|
size: labelSize.width
|
|
});
|
|
}
|
|
|
|
function calculateY(box, labelSize, position, padding) {
|
|
const {y: start, y2: end, height: size, options} = box;
|
|
const {yAdjust: adjust, borderWidth} = options.label;
|
|
return calculatePosition$1({start, end, size}, {
|
|
position: position.y,
|
|
padding: {start: padding.top, end: padding.bottom},
|
|
adjust, borderWidth,
|
|
size: labelSize.height
|
|
});
|
|
}
|
|
|
|
function calculatePosition$1(boxOpts, labelOpts) {
|
|
const {start, end} = boxOpts;
|
|
const {position, padding: {start: padStart, end: padEnd}, adjust, borderWidth} = labelOpts;
|
|
const availableSize = end - borderWidth - start - padStart - padEnd - labelOpts.size;
|
|
return start + borderWidth / 2 + adjust + padStart + getRelativePosition(availableSize, position);
|
|
}
|
|
|
|
const pointInLine = (p1, p2, t) => ({x: p1.x + t * (p2.x - p1.x), y: p1.y + t * (p2.y - p1.y)});
|
|
const interpolateX = (y, p1, p2) => pointInLine(p1, p2, Math.abs((y - p1.y) / (p2.y - p1.y))).x;
|
|
const interpolateY = (x, p1, p2) => pointInLine(p1, p2, Math.abs((x - p1.x) / (p2.x - p1.x))).y;
|
|
const sqr = v => v * v;
|
|
const defaultEpsilon = 0.001;
|
|
|
|
function isLineInArea({x, y, x2, y2}, {top, right, bottom, left}) {
|
|
return !(
|
|
(x < left && x2 < left) ||
|
|
(x > right && x2 > right) ||
|
|
(y < top && y2 < top) ||
|
|
(y > bottom && y2 > bottom)
|
|
);
|
|
}
|
|
|
|
function limitPointToArea({x, y}, p2, {top, right, bottom, left}) {
|
|
if (x < left) {
|
|
y = interpolateY(left, {x, y}, p2);
|
|
x = left;
|
|
}
|
|
if (x > right) {
|
|
y = interpolateY(right, {x, y}, p2);
|
|
x = right;
|
|
}
|
|
if (y < top) {
|
|
x = interpolateX(top, {x, y}, p2);
|
|
y = top;
|
|
}
|
|
if (y > bottom) {
|
|
x = interpolateX(bottom, {x, y}, p2);
|
|
y = bottom;
|
|
}
|
|
return {x, y};
|
|
}
|
|
|
|
function limitLineToArea(p1, p2, area) {
|
|
const {x, y} = limitPointToArea(p1, p2, area);
|
|
const {x: x2, y: y2} = limitPointToArea(p2, p1, area);
|
|
return {x, y, x2, y2, width: Math.abs(x2 - x), height: Math.abs(y2 - y)};
|
|
}
|
|
|
|
class LineAnnotation extends Element {
|
|
|
|
// TODO: make private in v2
|
|
intersects(x, y, epsilon = defaultEpsilon, useFinalPosition) {
|
|
// Adapted from https://stackoverflow.com/a/6853926/25507
|
|
const {x: x1, y: y1, x2, y2} = this.getProps(['x', 'y', 'x2', 'y2'], useFinalPosition);
|
|
const dx = x2 - x1;
|
|
const dy = y2 - y1;
|
|
const lenSq = sqr(dx) + sqr(dy);
|
|
const t = lenSq === 0 ? -1 : ((x - x1) * dx + (y - y1) * dy) / lenSq;
|
|
let xx, yy;
|
|
if (t < 0) {
|
|
xx = x1;
|
|
yy = y1;
|
|
} else if (t > 1) {
|
|
xx = x2;
|
|
yy = y2;
|
|
} else {
|
|
xx = x1 + t * dx;
|
|
yy = y1 + t * dy;
|
|
}
|
|
return (sqr(x - xx) + sqr(y - yy)) <= epsilon;
|
|
}
|
|
|
|
/**
|
|
* @todo make private in v2
|
|
* @param {boolean} useFinalPosition - use the element's animation target instead of current position
|
|
* @param {top, right, bottom, left} [chartArea] - optional, area of the chart
|
|
* @returns {boolean} true if the label is visible
|
|
*/
|
|
labelIsVisible(useFinalPosition, chartArea) {
|
|
const labelOpts = this.options.label;
|
|
if (!labelOpts || !labelOpts.enabled) {
|
|
return false;
|
|
}
|
|
return !chartArea || isLineInArea(this.getProps(['x', 'y', 'x2', 'y2'], useFinalPosition), chartArea);
|
|
}
|
|
|
|
// TODO: make private in v2
|
|
isOnLabel(mouseX, mouseY, useFinalPosition) {
|
|
if (!this.labelIsVisible(useFinalPosition)) {
|
|
return false;
|
|
}
|
|
const {labelX, labelY, labelWidth, labelHeight, labelRotation} = this.getProps(['labelX', 'labelY', 'labelWidth', 'labelHeight', 'labelRotation'], useFinalPosition);
|
|
const {x, y} = rotated({x: mouseX, y: mouseY}, {x: labelX, y: labelY}, -labelRotation);
|
|
const hBorderWidth = this.options.label.borderWidth / 2 || 0;
|
|
const w2 = labelWidth / 2 + hBorderWidth;
|
|
const h2 = labelHeight / 2 + hBorderWidth;
|
|
return x >= labelX - w2 - defaultEpsilon && x <= labelX + w2 + defaultEpsilon &&
|
|
y >= labelY - h2 - defaultEpsilon && y <= labelY + h2 + defaultEpsilon;
|
|
}
|
|
|
|
inRange(mouseX, mouseY, useFinalPosition) {
|
|
const epsilon = sqr(this.options.borderWidth / 2);
|
|
return this.intersects(mouseX, mouseY, epsilon, useFinalPosition) || this.isOnLabel(mouseX, mouseY, useFinalPosition);
|
|
}
|
|
|
|
getCenterPoint() {
|
|
return {
|
|
x: (this.x2 + this.x) / 2,
|
|
y: (this.y2 + this.y) / 2
|
|
};
|
|
}
|
|
|
|
draw(ctx) {
|
|
const {x, y, x2, y2, options} = this;
|
|
|
|
ctx.save();
|
|
if (!setBorderStyle(ctx, options)) {
|
|
// no border width, then line is not drawn
|
|
return ctx.restore();
|
|
}
|
|
setShadowStyle(ctx, options);
|
|
const angle = Math.atan2(y2 - y, x2 - x);
|
|
const length = Math.sqrt(Math.pow(x2 - x, 2) + Math.pow(y2 - y, 2));
|
|
const {startOpts, endOpts, startAdjust, endAdjust} = getArrowHeads(this);
|
|
|
|
ctx.translate(x, y);
|
|
ctx.rotate(angle);
|
|
ctx.beginPath();
|
|
ctx.moveTo(0 + startAdjust, 0);
|
|
ctx.lineTo(length - endAdjust, 0);
|
|
ctx.shadowColor = options.borderShadowColor;
|
|
ctx.stroke();
|
|
drawArrowHead(ctx, 0, startAdjust, startOpts);
|
|
drawArrowHead(ctx, length, -endAdjust, endOpts);
|
|
ctx.restore();
|
|
}
|
|
|
|
drawLabel(ctx, chartArea) {
|
|
if (!this.labelIsVisible(false, chartArea)) {
|
|
return;
|
|
}
|
|
const {labelX, labelY, labelWidth, labelHeight, labelRotation, labelPadding, labelTextSize, options: {label}} = this;
|
|
|
|
ctx.save();
|
|
ctx.translate(labelX, labelY);
|
|
ctx.rotate(labelRotation);
|
|
|
|
const boxRect = {
|
|
x: -(labelWidth / 2),
|
|
y: -(labelHeight / 2),
|
|
width: labelWidth,
|
|
height: labelHeight
|
|
};
|
|
drawBox(ctx, boxRect, label);
|
|
|
|
const labelTextRect = {
|
|
x: -(labelWidth / 2) + labelPadding.left + label.borderWidth / 2,
|
|
y: -(labelHeight / 2) + labelPadding.top + label.borderWidth / 2,
|
|
width: labelTextSize.width,
|
|
height: labelTextSize.height
|
|
};
|
|
drawLabel(ctx, labelTextRect, label);
|
|
ctx.restore();
|
|
}
|
|
|
|
resolveElementProperties(chart, options) {
|
|
const scale = chart.scales[options.scaleID];
|
|
let {top: y, left: x, bottom: y2, right: x2} = chart.chartArea;
|
|
let min, max;
|
|
|
|
if (scale) {
|
|
min = scaleValue(scale, options.value, NaN);
|
|
max = scaleValue(scale, options.endValue, min);
|
|
if (scale.isHorizontal()) {
|
|
x = min;
|
|
x2 = max;
|
|
} else {
|
|
y = min;
|
|
y2 = max;
|
|
}
|
|
} else {
|
|
const xScale = chart.scales[options.xScaleID];
|
|
const yScale = chart.scales[options.yScaleID];
|
|
|
|
if (xScale) {
|
|
x = scaleValue(xScale, options.xMin, x);
|
|
x2 = scaleValue(xScale, options.xMax, x2);
|
|
}
|
|
|
|
if (yScale) {
|
|
y = scaleValue(yScale, options.yMin, y);
|
|
y2 = scaleValue(yScale, options.yMax, y2);
|
|
}
|
|
}
|
|
const inside = isLineInArea({x, y, x2, y2}, chart.chartArea);
|
|
const properties = inside
|
|
? limitLineToArea({x, y}, {x: x2, y: y2}, chart.chartArea)
|
|
: {x, y, x2, y2, width: Math.abs(x2 - x), height: Math.abs(y2 - y)};
|
|
|
|
const label = options.label;
|
|
if (label && label.content) {
|
|
return loadLabelRect(properties, chart, label);
|
|
}
|
|
return properties;
|
|
}
|
|
}
|
|
|
|
LineAnnotation.id = 'lineAnnotation';
|
|
|
|
const arrowHeadsDefaults = {
|
|
backgroundColor: undefined,
|
|
backgroundShadowColor: undefined,
|
|
borderColor: undefined,
|
|
borderDash: undefined,
|
|
borderDashOffset: undefined,
|
|
borderShadowColor: undefined,
|
|
borderWidth: undefined,
|
|
enabled: undefined,
|
|
fill: undefined,
|
|
length: undefined,
|
|
shadowBlur: undefined,
|
|
shadowOffsetX: undefined,
|
|
shadowOffsetY: undefined,
|
|
width: undefined
|
|
};
|
|
|
|
LineAnnotation.defaults = {
|
|
adjustScaleRange: true,
|
|
arrowHeads: {
|
|
enabled: false,
|
|
end: Object.assign({}, arrowHeadsDefaults),
|
|
fill: false,
|
|
length: 12,
|
|
start: Object.assign({}, arrowHeadsDefaults),
|
|
width: 6
|
|
},
|
|
borderDash: [],
|
|
borderDashOffset: 0,
|
|
borderShadowColor: 'transparent',
|
|
borderWidth: 2,
|
|
display: true,
|
|
endValue: undefined,
|
|
label: {
|
|
backgroundColor: 'rgba(0,0,0,0.8)',
|
|
backgroundShadowColor: 'transparent',
|
|
borderCapStyle: 'butt',
|
|
borderColor: 'black',
|
|
borderDash: [],
|
|
borderDashOffset: 0,
|
|
borderJoinStyle: 'miter',
|
|
borderRadius: 6,
|
|
borderShadowColor: 'transparent',
|
|
borderWidth: 0,
|
|
color: '#fff',
|
|
content: null,
|
|
cornerRadius: undefined, // TODO: v2 remove support for cornerRadius
|
|
drawTime: undefined,
|
|
enabled: false,
|
|
font: {
|
|
family: undefined,
|
|
lineHeight: undefined,
|
|
size: undefined,
|
|
style: undefined,
|
|
weight: 'bold'
|
|
},
|
|
height: undefined,
|
|
padding: 6,
|
|
position: 'center',
|
|
rotation: 0,
|
|
shadowBlur: 0,
|
|
shadowOffsetX: 0,
|
|
shadowOffsetY: 0,
|
|
textAlign: 'center',
|
|
textStrokeColor: undefined,
|
|
textStrokeWidth: 0,
|
|
width: undefined,
|
|
xAdjust: 0,
|
|
xPadding: undefined, // TODO: v2 remove support for xPadding
|
|
yAdjust: 0,
|
|
yPadding: undefined, // TODO: v2 remove support for yPadding
|
|
},
|
|
scaleID: undefined,
|
|
shadowBlur: 0,
|
|
shadowOffsetX: 0,
|
|
shadowOffsetY: 0,
|
|
value: undefined,
|
|
xMax: undefined,
|
|
xMin: undefined,
|
|
xScaleID: 'x',
|
|
yMax: undefined,
|
|
yMin: undefined,
|
|
yScaleID: 'y'
|
|
};
|
|
|
|
LineAnnotation.descriptors = {
|
|
arrowHeads: {
|
|
start: {
|
|
_fallback: true
|
|
},
|
|
end: {
|
|
_fallback: true
|
|
},
|
|
_fallback: true
|
|
}
|
|
};
|
|
|
|
LineAnnotation.defaultRoutes = {
|
|
borderColor: 'color'
|
|
};
|
|
|
|
function loadLabelRect(line, chart, options) {
|
|
// TODO: v2 remove support for xPadding and yPadding
|
|
const {padding: lblPadding, xPadding, yPadding, borderWidth} = options;
|
|
const padding = getPadding(lblPadding, xPadding, yPadding);
|
|
const textSize = measureLabelSize(chart.ctx, options);
|
|
const width = textSize.width + padding.width + borderWidth;
|
|
const height = textSize.height + padding.height + borderWidth;
|
|
const labelRect = calculateLabelPosition(line, options, {width, height, padding}, chart.chartArea);
|
|
line.labelX = labelRect.x;
|
|
line.labelY = labelRect.y;
|
|
line.labelWidth = labelRect.width;
|
|
line.labelHeight = labelRect.height;
|
|
line.labelRotation = labelRect.rotation;
|
|
line.labelPadding = padding;
|
|
line.labelTextSize = textSize;
|
|
return line;
|
|
}
|
|
|
|
function calculateAutoRotation(line) {
|
|
const {x, y, x2, y2} = line;
|
|
const rotation = Math.atan2(y2 - y, x2 - x);
|
|
// Flip the rotation if it goes > PI/2 or < -PI/2, so label stays upright
|
|
return rotation > PI / 2 ? rotation - PI : rotation < PI / -2 ? rotation + PI : rotation;
|
|
}
|
|
|
|
// TODO: v2 remove support for xPadding and yPadding
|
|
function getPadding(padding, xPadding, yPadding) {
|
|
let tempPadding = padding;
|
|
if (xPadding || yPadding) {
|
|
tempPadding = {x: xPadding || 6, y: yPadding || 6};
|
|
}
|
|
return toPadding(tempPadding);
|
|
}
|
|
|
|
function calculateLabelPosition(line, label, sizes, chartArea) {
|
|
const {width, height, padding} = sizes;
|
|
const {xAdjust, yAdjust} = label;
|
|
const p1 = {x: line.x, y: line.y};
|
|
const p2 = {x: line.x2, y: line.y2};
|
|
const rotation = label.rotation === 'auto' ? calculateAutoRotation(line) : toRadians(label.rotation);
|
|
const size = rotatedSize(width, height, rotation);
|
|
const t = calculateT(line, label, {labelSize: size, padding}, chartArea);
|
|
const pt = pointInLine(p1, p2, t);
|
|
const xCoordinateSizes = {size: size.w, min: chartArea.left, max: chartArea.right, padding: padding.left};
|
|
const yCoordinateSizes = {size: size.h, min: chartArea.top, max: chartArea.bottom, padding: padding.top};
|
|
|
|
return {
|
|
x: adjustLabelCoordinate(pt.x, xCoordinateSizes) + xAdjust,
|
|
y: adjustLabelCoordinate(pt.y, yCoordinateSizes) + yAdjust,
|
|
width,
|
|
height,
|
|
rotation
|
|
};
|
|
}
|
|
|
|
function rotatedSize(width, height, rotation) {
|
|
const cos = Math.cos(rotation);
|
|
const sin = Math.sin(rotation);
|
|
return {
|
|
w: Math.abs(width * cos) + Math.abs(height * sin),
|
|
h: Math.abs(width * sin) + Math.abs(height * cos)
|
|
};
|
|
}
|
|
|
|
function calculateT(line, label, sizes, chartArea) {
|
|
let t;
|
|
const space = spaceAround(line, chartArea);
|
|
if (label.position === 'start') {
|
|
t = calculateTAdjust({w: line.x2 - line.x, h: line.y2 - line.y}, sizes, label, space);
|
|
} else if (label.position === 'end') {
|
|
t = 1 - calculateTAdjust({w: line.x - line.x2, h: line.y - line.y2}, sizes, label, space);
|
|
} else {
|
|
t = getRelativePosition(1, label.position);
|
|
}
|
|
return t;
|
|
}
|
|
|
|
function calculateTAdjust(lineSize, sizes, label, space) {
|
|
const {labelSize, padding} = sizes;
|
|
const lineW = lineSize.w * space.dx;
|
|
const lineH = lineSize.h * space.dy;
|
|
const x = (lineW > 0) && ((labelSize.w / 2 + padding.left - space.x) / lineW);
|
|
const y = (lineH > 0) && ((labelSize.h / 2 + padding.top - space.y) / lineH);
|
|
return clamp(Math.max(x, y), 0, 0.25);
|
|
}
|
|
|
|
function spaceAround(line, chartArea) {
|
|
const {x, x2, y, y2} = line;
|
|
const t = Math.min(y, y2) - chartArea.top;
|
|
const l = Math.min(x, x2) - chartArea.left;
|
|
const b = chartArea.bottom - Math.max(y, y2);
|
|
const r = chartArea.right - Math.max(x, x2);
|
|
return {
|
|
x: Math.min(l, r),
|
|
y: Math.min(t, b),
|
|
dx: l <= r ? 1 : -1,
|
|
dy: t <= b ? 1 : -1
|
|
};
|
|
}
|
|
|
|
function adjustLabelCoordinate(coordinate, labelSizes) {
|
|
const {size, min, max, padding} = labelSizes;
|
|
const halfSize = size / 2;
|
|
if (size > max - min) {
|
|
// if it does not fit, display as much as possible
|
|
return (max + min) / 2;
|
|
}
|
|
if (min >= (coordinate - padding - halfSize)) {
|
|
coordinate = min + padding + halfSize;
|
|
}
|
|
if (max <= (coordinate + padding + halfSize)) {
|
|
coordinate = max - padding - halfSize;
|
|
}
|
|
return coordinate;
|
|
}
|
|
|
|
function getArrowHeads(line) {
|
|
const options = line.options;
|
|
const arrowStartOpts = options.arrowHeads && options.arrowHeads.start;
|
|
const arrowEndOpts = options.arrowHeads && options.arrowHeads.end;
|
|
return {
|
|
startOpts: arrowStartOpts,
|
|
endOpts: arrowEndOpts,
|
|
startAdjust: getLineAdjust(line, arrowStartOpts),
|
|
endAdjust: getLineAdjust(line, arrowEndOpts)
|
|
};
|
|
}
|
|
|
|
function getLineAdjust(line, arrowOpts) {
|
|
if (!arrowOpts || !arrowOpts.enabled) {
|
|
return 0;
|
|
}
|
|
const {length, width} = arrowOpts;
|
|
const adjust = line.options.borderWidth / 2;
|
|
const p1 = {x: length, y: width + adjust};
|
|
const p2 = {x: 0, y: adjust};
|
|
return Math.abs(interpolateX(0, p1, p2));
|
|
}
|
|
|
|
function drawArrowHead(ctx, offset, adjust, arrowOpts) {
|
|
if (!arrowOpts || !arrowOpts.enabled) {
|
|
return;
|
|
}
|
|
const {length, width, fill, backgroundColor, borderColor} = arrowOpts;
|
|
const arrowOffsetX = Math.abs(offset - length) + adjust;
|
|
ctx.beginPath();
|
|
setShadowStyle(ctx, arrowOpts);
|
|
setBorderStyle(ctx, arrowOpts);
|
|
ctx.moveTo(arrowOffsetX, -width);
|
|
ctx.lineTo(offset + adjust, 0);
|
|
ctx.lineTo(arrowOffsetX, width);
|
|
if (fill === true) {
|
|
ctx.fillStyle = backgroundColor || borderColor;
|
|
ctx.closePath();
|
|
ctx.fill();
|
|
ctx.shadowColor = 'transparent';
|
|
} else {
|
|
ctx.shadowColor = arrowOpts.borderShadowColor;
|
|
}
|
|
ctx.stroke();
|
|
}
|
|
|
|
class EllipseAnnotation extends Element {
|
|
|
|
inRange(mouseX, mouseY, useFinalPosition) {
|
|
return pointInEllipse({x: mouseX, y: mouseY}, this.getProps(['width', 'height'], useFinalPosition), this.options.rotation, this.options.borderWidth);
|
|
}
|
|
|
|
getCenterPoint(useFinalPosition) {
|
|
return getRectCenterPoint(this.getProps(['x', 'y', 'width', 'height'], useFinalPosition));
|
|
}
|
|
|
|
draw(ctx) {
|
|
const {width, height, options} = this;
|
|
const center = this.getCenterPoint();
|
|
|
|
ctx.save();
|
|
translate(ctx, this, options.rotation);
|
|
setShadowStyle(ctx, this.options);
|
|
ctx.beginPath();
|
|
ctx.fillStyle = options.backgroundColor;
|
|
const stroke = setBorderStyle(ctx, options);
|
|
ctx.ellipse(center.x, center.y, height / 2, width / 2, PI / 2, 0, 2 * PI);
|
|
ctx.fill();
|
|
if (stroke) {
|
|
ctx.shadowColor = options.borderShadowColor;
|
|
ctx.stroke();
|
|
}
|
|
ctx.restore();
|
|
}
|
|
|
|
resolveElementProperties(chart, options) {
|
|
return getChartRect(chart, options);
|
|
}
|
|
|
|
}
|
|
|
|
EllipseAnnotation.id = 'ellipseAnnotation';
|
|
|
|
EllipseAnnotation.defaults = {
|
|
adjustScaleRange: true,
|
|
backgroundShadowColor: 'transparent',
|
|
borderDash: [],
|
|
borderDashOffset: 0,
|
|
borderShadowColor: 'transparent',
|
|
borderWidth: 1,
|
|
display: true,
|
|
rotation: 0,
|
|
shadowBlur: 0,
|
|
shadowOffsetX: 0,
|
|
shadowOffsetY: 0,
|
|
xMax: undefined,
|
|
xMin: undefined,
|
|
xScaleID: 'x',
|
|
yMax: undefined,
|
|
yMin: undefined,
|
|
yScaleID: 'y'
|
|
};
|
|
|
|
EllipseAnnotation.defaultRoutes = {
|
|
borderColor: 'color',
|
|
backgroundColor: 'color'
|
|
};
|
|
|
|
function pointInEllipse(p, ellipse, rotation, borderWidth) {
|
|
const {width, height} = ellipse;
|
|
const center = ellipse.getCenterPoint(true);
|
|
const xRadius = width / 2;
|
|
const yRadius = height / 2;
|
|
|
|
if (xRadius <= 0 || yRadius <= 0) {
|
|
return false;
|
|
}
|
|
// https://stackoverflow.com/questions/7946187/point-and-ellipse-rotated-position-test-algorithm
|
|
const angle = toRadians(rotation || 0);
|
|
const hBorderWidth = borderWidth / 2 || 0;
|
|
const cosAngle = Math.cos(angle);
|
|
const sinAngle = Math.sin(angle);
|
|
const a = Math.pow(cosAngle * (p.x - center.x) + sinAngle * (p.y - center.y), 2);
|
|
const b = Math.pow(sinAngle * (p.x - center.x) - cosAngle * (p.y - center.y), 2);
|
|
return (a / Math.pow(xRadius + hBorderWidth, 2)) + (b / Math.pow(yRadius + hBorderWidth, 2)) <= 1.0001;
|
|
}
|
|
|
|
class LabelAnnotation extends Element {
|
|
|
|
inRange(mouseX, mouseY, useFinalPosition) {
|
|
const {x, y} = rotated({x: mouseX, y: mouseY}, this.getCenterPoint(useFinalPosition), toRadians(-this.options.rotation));
|
|
return inBoxRange(x, y, this.getProps(['x', 'y', 'width', 'height'], useFinalPosition), this.options.borderWidth);
|
|
}
|
|
|
|
getCenterPoint(useFinalPosition) {
|
|
return getRectCenterPoint(this.getProps(['x', 'y', 'width', 'height'], useFinalPosition));
|
|
}
|
|
|
|
draw(ctx) {
|
|
if (!this.options.content) {
|
|
return;
|
|
}
|
|
const {labelX, labelY, labelWidth, labelHeight, options} = this;
|
|
ctx.save();
|
|
translate(ctx, this, options.rotation);
|
|
drawCallout(ctx, this);
|
|
drawBox(ctx, this, options);
|
|
drawLabel(ctx, {x: labelX, y: labelY, width: labelWidth, height: labelHeight}, options);
|
|
ctx.restore();
|
|
}
|
|
|
|
// TODO: make private in v2
|
|
resolveElementProperties(chart, options) {
|
|
const point = !isBoundToPoint(options) ? getRectCenterPoint(getChartRect(chart, options)) : getChartPoint(chart, options);
|
|
const padding = toPadding(options.padding);
|
|
const labelSize = measureLabelSize(chart.ctx, options);
|
|
const boxSize = measureRect(point, labelSize, options, padding);
|
|
const hBorderWidth = options.borderWidth / 2;
|
|
const properties = {
|
|
pointX: point.x,
|
|
pointY: point.y,
|
|
...boxSize,
|
|
labelX: boxSize.x + padding.left + hBorderWidth,
|
|
labelY: boxSize.y + padding.top + hBorderWidth,
|
|
labelWidth: labelSize.width,
|
|
labelHeight: labelSize.height
|
|
};
|
|
properties.calloutPosition = options.callout.enabled && resolveCalloutPosition(properties, options.callout, options.rotation);
|
|
return properties;
|
|
}
|
|
}
|
|
|
|
LabelAnnotation.id = 'labelAnnotation';
|
|
|
|
LabelAnnotation.defaults = {
|
|
adjustScaleRange: true,
|
|
backgroundColor: 'transparent',
|
|
backgroundShadowColor: 'transparent',
|
|
borderCapStyle: 'butt',
|
|
borderDash: [],
|
|
borderDashOffset: 0,
|
|
borderJoinStyle: 'miter',
|
|
borderRadius: 0,
|
|
borderShadowColor: 'transparent',
|
|
borderWidth: 0,
|
|
callout: {
|
|
borderCapStyle: 'butt',
|
|
borderColor: undefined,
|
|
borderDash: [],
|
|
borderDashOffset: 0,
|
|
borderJoinStyle: 'miter',
|
|
borderWidth: 1,
|
|
enabled: false,
|
|
margin: 5,
|
|
position: 'auto',
|
|
side: 5,
|
|
start: '50%',
|
|
},
|
|
color: 'black',
|
|
content: null,
|
|
display: true,
|
|
font: {
|
|
family: undefined,
|
|
lineHeight: undefined,
|
|
size: undefined,
|
|
style: undefined,
|
|
weight: undefined
|
|
},
|
|
height: undefined,
|
|
padding: 6,
|
|
position: 'center',
|
|
rotation: 0,
|
|
shadowBlur: 0,
|
|
shadowOffsetX: 0,
|
|
shadowOffsetY: 0,
|
|
textAlign: 'center',
|
|
textStrokeColor: undefined,
|
|
textStrokeWidth: 0,
|
|
width: undefined,
|
|
xAdjust: 0,
|
|
xMax: undefined,
|
|
xMin: undefined,
|
|
xScaleID: 'x',
|
|
xValue: undefined,
|
|
yAdjust: 0,
|
|
yMax: undefined,
|
|
yMin: undefined,
|
|
yScaleID: 'y',
|
|
yValue: undefined
|
|
};
|
|
|
|
LabelAnnotation.defaultRoutes = {
|
|
borderColor: 'color'
|
|
};
|
|
|
|
function measureRect(point, size, options, padding) {
|
|
const width = size.width + padding.width + options.borderWidth;
|
|
const height = size.height + padding.height + options.borderWidth;
|
|
const position = toPosition(options.position);
|
|
|
|
return {
|
|
x: calculatePosition(point.x, width, options.xAdjust, position.x),
|
|
y: calculatePosition(point.y, height, options.yAdjust, position.y),
|
|
width,
|
|
height
|
|
};
|
|
}
|
|
|
|
function calculatePosition(start, size, adjust = 0, position) {
|
|
return start - getRelativePosition(size, position) + adjust;
|
|
}
|
|
|
|
function drawCallout(ctx, element) {
|
|
const {pointX, pointY, calloutPosition, options} = element;
|
|
if (!calloutPosition || element.inRange(pointX, pointY)) {
|
|
return;
|
|
}
|
|
const callout = options.callout;
|
|
|
|
ctx.save();
|
|
ctx.beginPath();
|
|
const stroke = setBorderStyle(ctx, callout);
|
|
if (!stroke) {
|
|
return ctx.restore();
|
|
}
|
|
const {separatorStart, separatorEnd} = getCalloutSeparatorCoord(element, calloutPosition);
|
|
const {sideStart, sideEnd} = getCalloutSideCoord(element, calloutPosition, separatorStart);
|
|
if (callout.margin > 0 || options.borderWidth === 0) {
|
|
ctx.moveTo(separatorStart.x, separatorStart.y);
|
|
ctx.lineTo(separatorEnd.x, separatorEnd.y);
|
|
}
|
|
ctx.moveTo(sideStart.x, sideStart.y);
|
|
ctx.lineTo(sideEnd.x, sideEnd.y);
|
|
const rotatedPoint = rotated({x: pointX, y: pointY}, element.getCenterPoint(), toRadians(-options.rotation));
|
|
ctx.lineTo(rotatedPoint.x, rotatedPoint.y);
|
|
ctx.stroke();
|
|
ctx.restore();
|
|
}
|
|
|
|
function getCalloutSeparatorCoord(element, position) {
|
|
const {x, y, width, height} = element;
|
|
const adjust = getCalloutSeparatorAdjust(element, position);
|
|
let separatorStart, separatorEnd;
|
|
if (position === 'left' || position === 'right') {
|
|
separatorStart = {x: x + adjust, y};
|
|
separatorEnd = {x: separatorStart.x, y: separatorStart.y + height};
|
|
} else {
|
|
// position 'top' or 'bottom'
|
|
separatorStart = {x, y: y + adjust};
|
|
separatorEnd = {x: separatorStart.x + width, y: separatorStart.y};
|
|
}
|
|
return {separatorStart, separatorEnd};
|
|
}
|
|
|
|
function getCalloutSeparatorAdjust(element, position) {
|
|
const {width, height, options} = element;
|
|
const adjust = options.callout.margin + options.borderWidth / 2;
|
|
if (position === 'right') {
|
|
return width + adjust;
|
|
} else if (position === 'bottom') {
|
|
return height + adjust;
|
|
}
|
|
return -adjust;
|
|
}
|
|
|
|
function getCalloutSideCoord(element, position, separatorStart) {
|
|
const {y, width, height, options} = element;
|
|
const start = options.callout.start;
|
|
const side = getCalloutSideAdjust(position, options.callout);
|
|
let sideStart, sideEnd;
|
|
if (position === 'left' || position === 'right') {
|
|
sideStart = {x: separatorStart.x, y: y + getSize(height, start)};
|
|
sideEnd = {x: sideStart.x + side, y: sideStart.y};
|
|
} else {
|
|
// position 'top' or 'bottom'
|
|
sideStart = {x: separatorStart.x + getSize(width, start), y: separatorStart.y};
|
|
sideEnd = {x: sideStart.x, y: sideStart.y + side};
|
|
}
|
|
return {sideStart, sideEnd};
|
|
}
|
|
|
|
function getCalloutSideAdjust(position, options) {
|
|
const side = options.side;
|
|
if (position === 'left' || position === 'top') {
|
|
return -side;
|
|
}
|
|
return side;
|
|
}
|
|
|
|
function resolveCalloutPosition(properties, options, rotation) {
|
|
const position = options.position;
|
|
if (position === 'left' || position === 'right' || position === 'top' || position === 'bottom') {
|
|
return position;
|
|
}
|
|
return resolveCalloutAutoPosition(properties, options, rotation);
|
|
}
|
|
|
|
const positions = ['left', 'bottom', 'top', 'right'];
|
|
|
|
function resolveCalloutAutoPosition(properties, options, rotation) {
|
|
const {x, y, width, height, pointX, pointY} = properties;
|
|
const center = {x: x + width / 2, y: y + height / 2};
|
|
const start = options.start;
|
|
const xAdjust = getSize(width, start);
|
|
const yAdjust = getSize(height, start);
|
|
const xPoints = [x, x + xAdjust, x + xAdjust, x + width];
|
|
const yPoints = [y + yAdjust, y + height, y, y + yAdjust];
|
|
const result = [];
|
|
for (let index = 0; index < 4; index++) {
|
|
const rotatedPoint = rotated({x: xPoints[index], y: yPoints[index]}, center, toRadians(rotation));
|
|
result.push({
|
|
position: positions[index],
|
|
distance: distanceBetweenPoints(rotatedPoint, {x: pointX, y: pointY})
|
|
});
|
|
}
|
|
return result.sort((a, b) => a.distance - b.distance)[0].position;
|
|
}
|
|
|
|
class PointAnnotation extends Element {
|
|
|
|
inRange(mouseX, mouseY, useFinalPosition) {
|
|
const {width} = this.getProps(['width'], useFinalPosition);
|
|
return inPointRange({x: mouseX, y: mouseY}, this.getCenterPoint(useFinalPosition), width / 2, this.options.borderWidth);
|
|
}
|
|
|
|
getCenterPoint(useFinalPosition) {
|
|
return getElementCenterPoint(this, useFinalPosition);
|
|
}
|
|
|
|
draw(ctx) {
|
|
const options = this.options;
|
|
const borderWidth = options.borderWidth;
|
|
if (options.radius < 0.1) {
|
|
return;
|
|
}
|
|
ctx.save();
|
|
ctx.fillStyle = options.backgroundColor;
|
|
setShadowStyle(ctx, options);
|
|
const stroke = setBorderStyle(ctx, options);
|
|
options.borderWidth = 0;
|
|
drawPoint(ctx, options, this.x, this.y);
|
|
if (stroke && !isImageOrCanvas(options.pointStyle)) {
|
|
ctx.shadowColor = options.borderShadowColor;
|
|
ctx.stroke();
|
|
}
|
|
ctx.restore();
|
|
options.borderWidth = borderWidth;
|
|
}
|
|
|
|
resolveElementProperties(chart, options) {
|
|
return resolvePointPosition(chart, options);
|
|
}
|
|
}
|
|
|
|
PointAnnotation.id = 'pointAnnotation';
|
|
|
|
PointAnnotation.defaults = {
|
|
adjustScaleRange: true,
|
|
backgroundShadowColor: 'transparent',
|
|
borderDash: [],
|
|
borderDashOffset: 0,
|
|
borderShadowColor: 'transparent',
|
|
borderWidth: 1,
|
|
display: true,
|
|
pointStyle: 'circle',
|
|
radius: 10,
|
|
rotation: 0,
|
|
shadowBlur: 0,
|
|
shadowOffsetX: 0,
|
|
shadowOffsetY: 0,
|
|
xAdjust: 0,
|
|
xMax: undefined,
|
|
xMin: undefined,
|
|
xScaleID: 'x',
|
|
xValue: undefined,
|
|
yAdjust: 0,
|
|
yMax: undefined,
|
|
yMin: undefined,
|
|
yScaleID: 'y',
|
|
yValue: undefined
|
|
};
|
|
|
|
PointAnnotation.defaultRoutes = {
|
|
borderColor: 'color',
|
|
backgroundColor: 'color'
|
|
};
|
|
|
|
class PolygonAnnotation extends Element {
|
|
inRange(mouseX, mouseY, useFinalPosition) {
|
|
return this.options.radius >= 0.1 && this.elements.length > 1 && pointIsInPolygon(this.elements, mouseX, mouseY, useFinalPosition);
|
|
}
|
|
|
|
getCenterPoint(useFinalPosition) {
|
|
return getElementCenterPoint(this, useFinalPosition);
|
|
}
|
|
|
|
draw(ctx) {
|
|
const {elements, options} = this;
|
|
ctx.save();
|
|
ctx.beginPath();
|
|
ctx.fillStyle = options.backgroundColor;
|
|
setShadowStyle(ctx, options);
|
|
const stroke = setBorderStyle(ctx, options);
|
|
let first = true;
|
|
for (const el of elements) {
|
|
if (first) {
|
|
ctx.moveTo(el.x, el.y);
|
|
first = false;
|
|
} else {
|
|
ctx.lineTo(el.x, el.y);
|
|
}
|
|
}
|
|
ctx.closePath();
|
|
ctx.fill();
|
|
// If no border, don't draw it
|
|
if (stroke) {
|
|
ctx.shadowColor = options.borderShadowColor;
|
|
ctx.stroke();
|
|
}
|
|
ctx.restore();
|
|
}
|
|
|
|
resolveElementProperties(chart, options) {
|
|
const {x, y, width, height} = resolvePointPosition(chart, options);
|
|
const {sides, radius, rotation, borderWidth} = options;
|
|
const halfBorder = borderWidth / 2;
|
|
const elements = [];
|
|
const angle = (2 * PI) / sides;
|
|
let rad = rotation * RAD_PER_DEG;
|
|
for (let i = 0; i < sides; i++, rad += angle) {
|
|
const sin = Math.sin(rad);
|
|
const cos = Math.cos(rad);
|
|
elements.push({
|
|
type: 'point',
|
|
optionScope: 'point',
|
|
properties: {
|
|
x: x + sin * radius,
|
|
y: y - cos * radius,
|
|
bX: x + sin * (radius + halfBorder),
|
|
bY: y - cos * (radius + halfBorder)
|
|
}
|
|
});
|
|
}
|
|
return {x, y, width, height, elements, initProperties: {x, y}};
|
|
}
|
|
}
|
|
|
|
PolygonAnnotation.id = 'polygonAnnotation';
|
|
|
|
PolygonAnnotation.defaults = {
|
|
adjustScaleRange: true,
|
|
backgroundShadowColor: 'transparent',
|
|
borderCapStyle: 'butt',
|
|
borderDash: [],
|
|
borderDashOffset: 0,
|
|
borderJoinStyle: 'miter',
|
|
borderShadowColor: 'transparent',
|
|
borderWidth: 1,
|
|
display: true,
|
|
point: {
|
|
radius: 0
|
|
},
|
|
radius: 10,
|
|
rotation: 0,
|
|
shadowBlur: 0,
|
|
shadowOffsetX: 0,
|
|
shadowOffsetY: 0,
|
|
sides: 3,
|
|
xAdjust: 0,
|
|
xMax: undefined,
|
|
xMin: undefined,
|
|
xScaleID: 'x',
|
|
xValue: undefined,
|
|
yAdjust: 0,
|
|
yMax: undefined,
|
|
yMin: undefined,
|
|
yScaleID: 'y',
|
|
yValue: undefined
|
|
};
|
|
|
|
PolygonAnnotation.defaultRoutes = {
|
|
borderColor: 'color',
|
|
backgroundColor: 'color'
|
|
};
|
|
|
|
|
|
function pointIsInPolygon(points, x, y, useFinalPosition) {
|
|
let isInside = false;
|
|
let A = points[points.length - 1].getProps(['bX', 'bY'], useFinalPosition);
|
|
for (const point of points) {
|
|
const B = point.getProps(['bX', 'bY'], useFinalPosition);
|
|
if ((B.bY > y) !== (A.bY > y) && x < (A.bX - B.bX) * (y - B.bY) / (A.bY - B.bY) + B.bX) {
|
|
isInside = !isInside;
|
|
}
|
|
A = B;
|
|
}
|
|
return isInside;
|
|
}
|
|
|
|
const annotationTypes = {
|
|
box: BoxAnnotation,
|
|
ellipse: EllipseAnnotation,
|
|
label: LabelAnnotation,
|
|
line: LineAnnotation,
|
|
point: PointAnnotation,
|
|
polygon: PolygonAnnotation
|
|
};
|
|
|
|
/**
|
|
* Register fallback for annotation elements
|
|
* For example lineAnnotation options would be looked through:
|
|
* - the annotation object (options.plugins.annotation.annotations[id])
|
|
* - element options (options.elements.lineAnnotation)
|
|
* - element defaults (defaults.elements.lineAnnotation)
|
|
* - annotation plugin defaults (defaults.plugins.annotation, this is what we are registering here)
|
|
*/
|
|
Object.keys(annotationTypes).forEach(key => {
|
|
defaults.describe(`elements.${annotationTypes[key].id}`, {
|
|
_fallback: 'plugins.annotation'
|
|
});
|
|
});
|
|
|
|
const directUpdater = {
|
|
update: Object.assign
|
|
};
|
|
|
|
/**
|
|
* Resolve the annotation type, checking if is supported.
|
|
* @param {string} [type=line] - annotation type
|
|
* @returns {string} resolved annotation type
|
|
*/
|
|
function resolveType(type = 'line') {
|
|
if (annotationTypes[type]) {
|
|
return type;
|
|
}
|
|
console.warn(`Unknown annotation type: '${type}', defaulting to 'line'`);
|
|
return 'line';
|
|
}
|
|
|
|
/**
|
|
* Create or update all annotation elements, configured to the plugin.
|
|
* @param {Chart} chart - the chart where the plugin is enabled
|
|
* @param {Object} state - the state of the plugin
|
|
* @param {Object} options - annotation options to use
|
|
* @param {UpdateMode} mode - The update mode
|
|
*/
|
|
function updateElements(chart, state, options, mode) {
|
|
const animations = resolveAnimations(chart, options.animations, mode);
|
|
|
|
const annotations = state.annotations;
|
|
const elements = resyncElements(state.elements, annotations);
|
|
|
|
for (let i = 0; i < annotations.length; i++) {
|
|
const annotationOptions = annotations[i];
|
|
const element = getOrCreateElement(elements, i, annotationOptions.type);
|
|
const resolver = annotationOptions.setContext(getContext(chart, element, annotationOptions));
|
|
const properties = element.resolveElementProperties(chart, resolver);
|
|
|
|
properties.skip = toSkip(properties);
|
|
|
|
if ('elements' in properties) {
|
|
updateSubElements(element, properties, resolver, animations);
|
|
// Remove the sub-element definitions from properties, so the actual elements
|
|
// are not overwritten by their definitions
|
|
delete properties.elements;
|
|
}
|
|
|
|
if (!defined(element.x)) {
|
|
// If the element is newly created, assing the properties directly - to
|
|
// make them readily awailable to any scriptable options. If we do not do this,
|
|
// the properties retruned by `resolveElementProperties` are available only
|
|
// after options resolution.
|
|
Object.assign(element, properties);
|
|
}
|
|
|
|
properties.options = resolveAnnotationOptions(resolver);
|
|
|
|
animations.update(element, properties);
|
|
}
|
|
}
|
|
|
|
function toSkip(properties) {
|
|
return isNaN(properties.x) || isNaN(properties.y);
|
|
}
|
|
|
|
function resolveAnimations(chart, animOpts, mode) {
|
|
if (mode === 'reset' || mode === 'none' || mode === 'resize') {
|
|
return directUpdater;
|
|
}
|
|
return new Animations(chart, animOpts);
|
|
}
|
|
|
|
function updateSubElements(mainElement, {elements, initProperties}, resolver, animations) {
|
|
const subElements = mainElement.elements || (mainElement.elements = []);
|
|
subElements.length = elements.length;
|
|
for (let i = 0; i < elements.length; i++) {
|
|
const definition = elements[i];
|
|
const properties = definition.properties;
|
|
const subElement = getOrCreateElement(subElements, i, definition.type, initProperties);
|
|
const subResolver = resolver[definition.optionScope].override(definition);
|
|
properties.options = resolveAnnotationOptions(subResolver);
|
|
animations.update(subElement, properties);
|
|
}
|
|
}
|
|
|
|
function getOrCreateElement(elements, index, type, initProperties) {
|
|
const elementClass = annotationTypes[resolveType(type)];
|
|
let element = elements[index];
|
|
if (!element || !(element instanceof elementClass)) {
|
|
element = elements[index] = new elementClass();
|
|
if (isObject(initProperties)) {
|
|
Object.assign(element, initProperties);
|
|
}
|
|
}
|
|
return element;
|
|
}
|
|
|
|
function resolveAnnotationOptions(resolver) {
|
|
const elementClass = annotationTypes[resolveType(resolver.type)];
|
|
const result = {};
|
|
result.id = resolver.id;
|
|
result.type = resolver.type;
|
|
result.drawTime = resolver.drawTime;
|
|
Object.assign(result,
|
|
resolveObj(resolver, elementClass.defaults),
|
|
resolveObj(resolver, elementClass.defaultRoutes));
|
|
for (const hook of hooks) {
|
|
result[hook] = resolver[hook];
|
|
}
|
|
return result;
|
|
}
|
|
|
|
function resolveObj(resolver, defs) {
|
|
const result = {};
|
|
for (const prop of Object.keys(defs)) {
|
|
const optDefs = defs[prop];
|
|
const value = resolver[prop];
|
|
result[prop] = isObject(optDefs) ? resolveObj(value, optDefs) : value;
|
|
}
|
|
return result;
|
|
}
|
|
|
|
function getContext(chart, element, annotation) {
|
|
return element.$context || (element.$context = Object.assign(Object.create(chart.getContext()), {
|
|
element,
|
|
id: annotation.id,
|
|
type: 'annotation'
|
|
}));
|
|
}
|
|
|
|
function resyncElements(elements, annotations) {
|
|
const count = annotations.length;
|
|
const start = elements.length;
|
|
|
|
if (start < count) {
|
|
const add = count - start;
|
|
elements.splice(start, 0, ...new Array(add));
|
|
} else if (start > count) {
|
|
elements.splice(count, start - count);
|
|
}
|
|
return elements;
|
|
}
|
|
|
|
var name = "chartjs-plugin-annotation";
|
|
var version = "1.4.0";
|
|
|
|
const chartStates = new Map();
|
|
|
|
var annotation = {
|
|
id: 'annotation',
|
|
|
|
version,
|
|
|
|
/* TODO: enable in v2
|
|
beforeRegister() {
|
|
requireVersion('chart.js', '3.7', Chart.version);
|
|
},
|
|
*/
|
|
|
|
afterRegister() {
|
|
Chart.register(annotationTypes);
|
|
|
|
// TODO: Remove this check, warning and workaround in v2
|
|
if (!requireVersion('chart.js', '3.7', Chart.version, false)) {
|
|
console.warn(`${name} has known issues with chart.js versions prior to 3.7, please consider upgrading.`);
|
|
|
|
// Workaround for https://github.com/chartjs/chartjs-plugin-annotation/issues/572
|
|
Chart.defaults.set('elements.lineAnnotation', {
|
|
callout: {},
|
|
font: {},
|
|
padding: 6
|
|
});
|
|
}
|
|
},
|
|
|
|
afterUnregister() {
|
|
Chart.unregister(annotationTypes);
|
|
},
|
|
|
|
beforeInit(chart) {
|
|
chartStates.set(chart, {
|
|
annotations: [],
|
|
elements: [],
|
|
visibleElements: [],
|
|
listeners: {},
|
|
listened: false,
|
|
moveListened: false
|
|
});
|
|
},
|
|
|
|
beforeUpdate(chart, args, options) {
|
|
const state = chartStates.get(chart);
|
|
const annotations = state.annotations = [];
|
|
|
|
let annotationOptions = options.annotations;
|
|
if (isObject(annotationOptions)) {
|
|
Object.keys(annotationOptions).forEach(key => {
|
|
const value = annotationOptions[key];
|
|
if (isObject(value)) {
|
|
value.id = key;
|
|
annotations.push(value);
|
|
}
|
|
});
|
|
} else if (isArray(annotationOptions)) {
|
|
annotations.push(...annotationOptions);
|
|
}
|
|
verifyScaleOptions(annotations, chart.scales);
|
|
},
|
|
|
|
afterDataLimits(chart, args) {
|
|
const state = chartStates.get(chart);
|
|
adjustScaleRange(chart, args.scale, state.annotations.filter(a => a.display && a.adjustScaleRange));
|
|
},
|
|
|
|
afterUpdate(chart, args, options) {
|
|
const state = chartStates.get(chart);
|
|
updateListeners(chart, state, options);
|
|
updateElements(chart, state, options, args.mode);
|
|
state.visibleElements = state.elements.filter(el => !el.skip && el.options.display);
|
|
},
|
|
|
|
beforeDatasetsDraw(chart, _args, options) {
|
|
draw(chart, 'beforeDatasetsDraw', options.clip);
|
|
},
|
|
|
|
afterDatasetsDraw(chart, _args, options) {
|
|
draw(chart, 'afterDatasetsDraw', options.clip);
|
|
},
|
|
|
|
beforeDraw(chart, _args, options) {
|
|
draw(chart, 'beforeDraw', options.clip);
|
|
},
|
|
|
|
afterDraw(chart, _args, options) {
|
|
draw(chart, 'afterDraw', options.clip);
|
|
},
|
|
|
|
beforeEvent(chart, args, options) {
|
|
const state = chartStates.get(chart);
|
|
handleEvent(state, args.event, options);
|
|
},
|
|
|
|
destroy(chart) {
|
|
chartStates.delete(chart);
|
|
},
|
|
|
|
_getState(chart) {
|
|
return chartStates.get(chart);
|
|
},
|
|
|
|
defaults: {
|
|
animations: {
|
|
numbers: {
|
|
properties: ['x', 'y', 'x2', 'y2', 'width', 'height', 'pointX', 'pointY', 'labelX', 'labelY', 'labelWidth', 'labelHeight', 'radius'],
|
|
type: 'number'
|
|
},
|
|
},
|
|
clip: true,
|
|
dblClickSpeed: 350, // ms
|
|
drawTime: 'afterDatasetsDraw',
|
|
label: {
|
|
drawTime: null
|
|
}
|
|
},
|
|
|
|
descriptors: {
|
|
_indexable: false,
|
|
_scriptable: (prop) => !hooks.includes(prop),
|
|
annotations: {
|
|
_allKeys: false,
|
|
_fallback: (prop, opts) => `elements.${annotationTypes[resolveType(opts.type)].id}`,
|
|
},
|
|
},
|
|
|
|
additionalOptionScopes: ['']
|
|
};
|
|
|
|
function draw(chart, caller, clip) {
|
|
const {ctx, chartArea} = chart;
|
|
const {visibleElements} = chartStates.get(chart);
|
|
|
|
if (clip) {
|
|
clipArea(ctx, chartArea);
|
|
}
|
|
|
|
drawElements(ctx, visibleElements, caller);
|
|
drawSubElements(ctx, visibleElements, caller);
|
|
|
|
if (clip) {
|
|
unclipArea(ctx);
|
|
}
|
|
|
|
visibleElements.forEach(el => {
|
|
if (!('drawLabel' in el)) {
|
|
return;
|
|
}
|
|
const label = el.options.label;
|
|
if (label && label.enabled && label.content && (label.drawTime || el.options.drawTime) === caller) {
|
|
el.drawLabel(ctx, chartArea);
|
|
}
|
|
});
|
|
}
|
|
|
|
function drawElements(ctx, elements, caller) {
|
|
for (const el of elements) {
|
|
if (el.options.drawTime === caller) {
|
|
el.draw(ctx);
|
|
}
|
|
}
|
|
}
|
|
|
|
function drawSubElements(ctx, elements, caller) {
|
|
for (const el of elements) {
|
|
if (isArray(el.elements)) {
|
|
drawElements(ctx, el.elements, caller);
|
|
}
|
|
}
|
|
}
|
|
|
|
export { annotation as default };
|
|
|