mirror of
https://github.com/chartjs/Chart.js.git
synced 2024-10-06 12:19:08 +02:00
4c200b2574
* Replace html extension with md extension for docs * Revert some links * Commit saved files
108 lines
2.3 KiB
Markdown
108 lines
2.3 KiB
Markdown
# Progressive Line
|
|
|
|
```js chart-editor
|
|
|
|
// <block:data:2>
|
|
const data = [];
|
|
const data2 = [];
|
|
let prev = 100;
|
|
let prev2 = 80;
|
|
for (let i = 0; i < 1000; i++) {
|
|
prev += 5 - Math.random() * 10;
|
|
data.push({x: i, y: prev});
|
|
prev2 += 5 - Math.random() * 10;
|
|
data2.push({x: i, y: prev2});
|
|
}
|
|
// </block:data>
|
|
|
|
// <block:animation:1>
|
|
const totalDuration = 10000;
|
|
const delayBetweenPoints = totalDuration / data.length;
|
|
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;
|
|
const animation = {
|
|
x: {
|
|
type: 'number',
|
|
easing: 'linear',
|
|
duration: delayBetweenPoints,
|
|
from: NaN, // the point is initially skipped
|
|
delay(ctx) {
|
|
if (ctx.type !== 'data' || ctx.xStarted) {
|
|
return 0;
|
|
}
|
|
ctx.xStarted = true;
|
|
return ctx.index * delayBetweenPoints;
|
|
}
|
|
},
|
|
y: {
|
|
type: 'number',
|
|
easing: 'linear',
|
|
duration: delayBetweenPoints,
|
|
from: previousY,
|
|
delay(ctx) {
|
|
if (ctx.type !== 'data' || ctx.yStarted) {
|
|
return 0;
|
|
}
|
|
ctx.yStarted = true;
|
|
return ctx.index * delayBetweenPoints;
|
|
}
|
|
}
|
|
};
|
|
// </block:animation>
|
|
|
|
// <block:config:0>
|
|
const config = {
|
|
type: 'line',
|
|
data: {
|
|
datasets: [{
|
|
borderColor: Utils.CHART_COLORS.red,
|
|
borderWidth: 1,
|
|
radius: 0,
|
|
data: data,
|
|
},
|
|
{
|
|
borderColor: Utils.CHART_COLORS.blue,
|
|
borderWidth: 1,
|
|
radius: 0,
|
|
data: data2,
|
|
}]
|
|
},
|
|
options: {
|
|
animation,
|
|
interaction: {
|
|
intersect: false
|
|
},
|
|
plugins: {
|
|
legend: false
|
|
},
|
|
scales: {
|
|
x: {
|
|
type: 'linear'
|
|
}
|
|
}
|
|
}
|
|
};
|
|
// </block:config>
|
|
|
|
module.exports = {
|
|
config
|
|
};
|
|
|
|
```
|
|
|
|
## Api
|
|
* [Chart](../../api/classes/Chart.md)
|
|
* [`getDatasetMeta`](../../api/classes/Chart.md#getdatasetmeta)
|
|
* [Scale](../../api/classes/Scale.md)
|
|
* [`getPixelForValue`](../../api/classes/Scale.md#getpixelforvalue)
|
|
## Docs
|
|
* [Animations](../../configuration/animations.md)
|
|
* [animation](../../configuration/animations.md#animation)
|
|
* `delay`
|
|
* `duration`
|
|
* `easing`
|
|
* `loop`
|
|
* [Line](../../charts/line.md)
|
|
* [Options](../../general/options.md)
|
|
* [Scriptable Options](../../general/options.md#scriptable-options)
|
|
* [Data Context](../../general/options.md#data)
|