98 lines
2.6 KiB
Markdown
98 lines
2.6 KiB
Markdown
# Animations
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Chart.js animates charts out of the box. A number of options are provided to configure how the animation looks and how long it takes.
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## Animation Configuration
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The following animation options are available. The global options for are defined in `Chart.defaults.global.animation`.
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| Name | Type | Default | Description
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| ---- | ---- | ------- | -----------
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| `duration` | `number` | `1000` | The number of milliseconds an animation takes.
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| `easing` | `string` | `'easeOutQuart'` | Easing function to use. [more...](#easing)
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| `onProgress` | `function` | `null` | Callback called on each step of an animation. [more...](#animation-callbacks)
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| `onComplete` | `function` | `null` | Callback called at the end of an animation. [more...](#animation-callbacks)
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## Easing
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Available options are:
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* `'linear'`
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* `'easeInQuad'`
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* `'easeOutQuad'`
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* `'easeInOutQuad'`
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* `'easeInCubic'`
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* `'easeOutCubic'`
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* `'easeInOutCubic'`
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* `'easeInQuart'`
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* `'easeOutQuart'`
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* `'easeInOutQuart'`
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* `'easeInQuint'`
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* `'easeOutQuint'`
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* `'easeInOutQuint'`
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* `'easeInSine'`
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* `'easeOutSine'`
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* `'easeInOutSine'`
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* `'easeInExpo'`
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* `'easeOutExpo'`
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* `'easeInOutExpo'`
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* `'easeInCirc'`
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* `'easeOutCirc'`
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* `'easeInOutCirc'`
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* `'easeInElastic'`
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* `'easeOutElastic'`
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* `'easeInOutElastic'`
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* `'easeInBack'`
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* `'easeOutBack'`
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* `'easeInOutBack'`
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* `'easeInBounce'`
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* `'easeOutBounce'`
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* `'easeInOutBounce'`
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See [Robert Penner's easing equations](http://robertpenner.com/easing/).
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## Animation Callbacks
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The `onProgress` and `onComplete` callbacks are useful for synchronizing an external draw to the chart animation. The callback is passed a `Chart.Animation` instance:
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```javascript
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{
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// Chart object
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chart: Chart,
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// Current Animation frame number
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currentStep: number,
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// Number of animation frames
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numSteps: number,
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// Animation easing to use
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easing: string,
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// Function that renders the chart
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render: function,
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// User callback
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onAnimationProgress: function,
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// User callback
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onAnimationComplete: function
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}
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```
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The following example fills a progress bar during the chart animation.
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```javascript
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var chart = new Chart(ctx, {
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type: 'line',
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data: data,
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options: {
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animation: {
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onProgress: function(animation) {
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progress.value = animation.animationObject.currentStep / animation.animationObject.numSteps;
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}
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}
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}
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});
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```
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Another example usage of these callbacks can be found on [Github](https://github.com/chartjs/Chart.js/blob/master/samples/advanced/progress-bar.html): this sample displays a progress bar showing how far along the animation is.
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