2021-10-26 13:49:04 +02:00
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# Progressive Line With Easing
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```js chart-editor
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// <block:data:2>
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const data = [];
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const data2 = [];
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let prev = 100;
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let prev2 = 80;
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for (let i = 0; i < 1000; i++) {
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prev += 5 - Math.random() * 10;
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data.push({x: i, y: prev});
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prev2 += 5 - Math.random() * 10;
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data2.push({x: i, y: prev2});
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}
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// </block:data>
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// <block:animation:1>
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let easing = helpers.easingEffects.easeOutQuad;
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let restart = false;
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const totalDuration = 5000;
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const duration = (ctx) => easing(ctx.index / data.length) * totalDuration / data.length;
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const delay = (ctx) => easing(ctx.index / data.length) * totalDuration;
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const previousY = (ctx) => ctx.index === 0 ? ctx.chart.scales.y.getPixelForValue(100) : ctx.chart.getDatasetMeta(ctx.datasetIndex).data[ctx.index - 1].getProps(['y'], true).y;
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const animation = {
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x: {
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type: 'number',
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easing: 'linear',
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duration: duration,
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from: NaN, // the point is initially skipped
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delay(ctx) {
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if (ctx.type !== 'data' || ctx.xStarted) {
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return 0;
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}
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ctx.xStarted = true;
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return delay(ctx);
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}
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},
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y: {
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type: 'number',
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easing: 'linear',
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duration: duration,
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from: previousY,
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delay(ctx) {
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if (ctx.type !== 'data' || ctx.yStarted) {
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return 0;
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}
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ctx.yStarted = true;
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return delay(ctx);
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}
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}
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};
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// </block:animation>
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// <block:config:0>
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const config = {
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type: 'line',
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data: {
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datasets: [{
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borderColor: Utils.CHART_COLORS.red,
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borderWidth: 1,
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radius: 0,
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data: data,
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},
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{
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borderColor: Utils.CHART_COLORS.blue,
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borderWidth: 1,
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radius: 0,
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data: data2,
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}]
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},
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options: {
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animation,
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interaction: {
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intersect: false
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},
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plugins: {
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legend: false,
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title: {
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display: true,
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text: () => easing.name
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}
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},
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scales: {
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x: {
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type: 'linear'
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}
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}
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}
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};
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// </block:config>
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// <block:actions:2>
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function restartAnims(chart) {
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chart.stop();
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const meta0 = chart.getDatasetMeta(0);
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const meta1 = chart.getDatasetMeta(1);
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for (let i = 0; i < data.length; i++) {
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const ctx0 = meta0.controller.getContext(i);
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const ctx1 = meta1.controller.getContext(i);
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ctx0.xStarted = ctx0.yStarted = false;
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ctx1.xStarted = ctx1.yStarted = false;
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}
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chart.update();
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}
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const actions = [
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{
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name: 'easeOutQuad',
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handler(chart) {
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easing = helpers.easingEffects.easeOutQuad;
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restartAnims(chart);
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}
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},
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{
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name: 'easeOutCubic',
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handler(chart) {
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easing = helpers.easingEffects.easeOutCubic;
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restartAnims(chart);
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}
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},
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{
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name: 'easeOutQuart',
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handler(chart) {
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easing = helpers.easingEffects.easeOutQuart;
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restartAnims(chart);
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}
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},
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{
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name: 'easeOutQuint',
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handler(chart) {
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easing = helpers.easingEffects.easeOutQuint;
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restartAnims(chart);
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}
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},
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{
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name: 'easeInQuad',
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handler(chart) {
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easing = helpers.easingEffects.easeInQuad;
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restartAnims(chart);
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}
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},
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{
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name: 'easeInCubic',
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handler(chart) {
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easing = helpers.easingEffects.easeInCubic;
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restartAnims(chart);
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}
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},
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{
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name: 'easeInQuart',
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handler(chart) {
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easing = helpers.easingEffects.easeInQuart;
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restartAnims(chart);
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}
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},
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{
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name: 'easeInQuint',
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handler(chart) {
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easing = helpers.easingEffects.easeInQuint;
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restartAnims(chart);
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}
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},
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];
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// </block:actions>
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module.exports = {
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config,
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actions
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};
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```
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2022-05-21 17:02:13 +02:00
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## Api
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* [Chart](../../api/classes/Chart.md)
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* [`getDatasetMeta`](../../api/classes/Chart.md#getdatasetmeta)
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* [Scale](../../api/classes/Scale.html)
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* [`getPixelForValue`](../../api/classes/Scale.html#getpixelforvalue)
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## Docs
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* [Animations](../../configuration/animations.html)
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* [animation](../../configuration/animations.html#animation)
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* `delay`
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* `duration`
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* `easing`
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* `loop`
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* [Easing](../../configuration/animations.html#easing)
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* [Line](../../charts/line.html)
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* [Options](../../general/options.html)
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* [Scriptable Options](../../general/options.html#scriptable-options)
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* [Data Context](../../general/options.html#data)
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