73 lines
2.5 KiB
Markdown
73 lines
2.5 KiB
Markdown
# Area Charts
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Both [line](line.md) and [radar](radar.md) charts support a `fill` option on the dataset object which can be used to create area between two datasets or a dataset and a boundary, i.e. the scale `origin`, `start` or `end` (see [filling modes](#filling-modes)).
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> **Note:** this feature is implemented by the [`filler` plugin](https://github.com/chartjs/Chart.js/blob/master/src/plugins/plugin.filler.js).
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## Filling modes
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| Mode | Type | Values |
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| :--- | :--- | :--- |
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| Absolute dataset index <sup>1</sup> | `number` | `1`, `2`, `3`, ... |
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| Relative dataset index <sup>1</sup> | `string` | `'-1'`, `'-2'`, `'+1'`, ... |
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| Boundary <sup>2</sup> | `string` | `'start'`, `'end'`, `'origin'` |
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| Disabled <sup>3</sup> | `boolean` | `false` |
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> <sup>1</sup> dataset filling modes have been introduced in version 2.6.0<br>
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> <sup>2</sup> prior version 2.6.0, boundary values was `'zero'`, `'top'`, `'bottom'` (deprecated)<br>
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> <sup>3</sup> for backward compatibility, `fill: true` (default) is equivalent to `fill: 'origin'`<br>
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**Example**
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```javascript
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new Chart(ctx, {
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data: {
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datasets: [
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{fill: 'origin'}, // 0: fill to 'origin'
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{fill: '+2'}, // 1: fill to dataset 3
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{fill: 1}, // 2: fill to dataset 1
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{fill: false}, // 3: no fill
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{fill: '-2'} // 4: fill to dataset 2
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]
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}
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});
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```
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## Configuration
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| Option | Type | Default | Description |
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| :--- | :--- | :--- | :--- |
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| [`plugins.filler.propagate`](#propagate) | `boolean` | `true` | Fill propagation when target is hidden.
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### propagate
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`propagate` takes a `boolean` value (default: `true`).
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If `true`, the fill area will be recursively extended to the visible target defined by the `fill` value of hidden dataset targets:
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**Example**
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```javascript
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new Chart(ctx, {
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data: {
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datasets: [
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{fill: 'origin'}, // 0: fill to 'origin'
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{fill: '-1'}, // 1: fill to dataset 0
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{fill: 1}, // 2: fill to dataset 1
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{fill: false}, // 3: no fill
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{fill: '-2'} // 4: fill to dataset 2
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]
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},
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options: {
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plugins: {
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filler: {
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propagate: 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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`propagate: true`:
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- if dataset 2 is hidden, dataset 4 will fill to dataset 1
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- if dataset 2 and 1 are hidden, dataset 4 will fill to `'origin'`
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`propagate: false`:
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- if dataset 2 and/or 4 are hidden, dataset 4 will not be filled
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