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90 lines
4.7 KiB
Markdown
90 lines
4.7 KiB
Markdown
# Elements
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While chart types provide settings to configure the styling of each dataset, you sometimes want to style **all datasets the same way**. A common example would be to stroke all of the bars in a bar chart with the same colour but change the fill per dataset. Options can be configured for four different types of elements: **[arc](#arc-configuration)**, **[lines](#line-configuration)**, **[points](#point-configuration)**, and **[rectangles](#rectangle-configuration)**. When set, these options apply to all objects of that type unless specifically overridden by the configuration attached to a dataset.
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## Global Configuration
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The element options can be specified per chart or globally. The global options for elements are defined in `Chart.defaults.elements`. For example, to set the border width of all bar charts globally you would do:
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```javascript
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Chart.defaults.elements.rectangle.borderWidth = 2;
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```
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## Point Configuration
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Point elements are used to represent the points in a line, radar or bubble chart.
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Global point options: `Chart.defaults.elements.point`.
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| Name | Type | Default | Description
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| ---- | ---- | ------- | -----------
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| `radius` | `number` | `3` | Point radius.
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| [`pointStyle`](#point-styles) | <code>string|Image</code> | `'circle'` | Point style.
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| `rotation` | `number` | `0` | Point rotation (in degrees).
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| `backgroundColor` | `Color` | `'rgba(0, 0, 0, 0.1)'` | Point fill color.
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| `borderWidth` | `number` | `1` | Point stroke width.
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| `borderColor` | `Color` | `'rgba(0, 0, 0, 0.1)'` | Point stroke color.
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| `hitRadius` | `number` | `1` | Extra radius added to point radius for hit detection.
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| `hoverRadius` | `number` | `4` | Point radius when hovered.
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| `hoverBorderWidth` | `number` | `1` | Stroke width when hovered.
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### Point Styles
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The following values are supported:
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- `'circle'`
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- `'cross'`
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- `'crossRot'`
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- `'dash'`
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- `'line'`
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- `'rect'`
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- `'rectRounded'`
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- `'rectRot'`
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- `'star'`
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- `'triangle'`
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If the value is an image, that image is drawn on the canvas using [drawImage](https://developer.mozilla.org/en/docs/Web/API/CanvasRenderingContext2D/drawImage).
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## Line Configuration
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Line elements are used to represent the line in a line chart.
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Global line options: `Chart.defaults.elements.line`.
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| Name | Type | Default | Description
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| ---- | ---- | ------- | -----------
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| `tension` | `number` | `0.4` | Bézier curve tension (`0` for no Bézier curves).
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| `backgroundColor` | `Color` | `'rgba(0, 0, 0, 0.1)'` | Line fill color.
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| `borderWidth` | `number` | `3` | Line stroke width.
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| `borderColor` | `Color` | `'rgba(0, 0, 0, 0.1)'` | Line stroke color.
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| `borderCapStyle` | `string` | `'butt'` | Line cap style. See [MDN](https://developer.mozilla.org/en/docs/Web/API/CanvasRenderingContext2D/lineCap).
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| `borderDash` | `number[]` | `[]` | Line dash. See [MDN](https://developer.mozilla.org/en-US/docs/Web/API/CanvasRenderingContext2D/setLineDash).
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| `borderDashOffset` | `number` | `0.0` | Line dash offset. See [MDN](https://developer.mozilla.org/en-US/docs/Web/API/CanvasRenderingContext2D/lineDashOffset).
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| `borderJoinStyle` | `string` | `'miter'` | Line join style. See [MDN](https://developer.mozilla.org/en-US/docs/Web/API/CanvasRenderingContext2D/lineJoin).
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| `capBezierPoints` | `boolean` | `true` | `true` to keep Bézier control inside the chart, `false` for no restriction.
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| `cubicInterpolationMode` | `string` | `'default'` | Interpolation mode to apply. [See more...](../charts/line.md#cubicinterpolationmode)
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| `fill` | <code>boolean|string</code> | `true` | How to fill the area under the line. See [area charts](../charts/area.md#filling-modes).
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| `stepped` | `boolean` | `false` | `true` to show the line as a stepped line (`tension` will be ignored).
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## Rectangle Configuration
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Rectangle elements are used to represent the bars in a bar chart.
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Global rectangle options: `Chart.defaults.elements.rectangle`.
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| Name | Type | Default | Description
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| ---- | ---- | ------- | -----------
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| `backgroundColor` | `Color` | `'rgba(0, 0, 0, 0.1)'` | Bar fill color.
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| `borderWidth` | `number` | `0` | Bar stroke width.
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| `borderColor` | `Color` | `'rgba(0, 0, 0, 0.1)'` | Bar stroke color.
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| `borderSkipped` | `string` | `'bottom'` | Skipped (excluded) border: `'bottom'`, `'left'`, `'top'` or `'right'`.
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## Arc Configuration
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Arcs are used in the polar area, doughnut and pie charts.
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Global arc options: `Chart.defaults.elements.arc`.
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| Name | Type | Default | Description
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| ---- | ---- | ------- | -----------
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| `angle` - for polar only | `number` | `circumference / (arc count)` | Arc angle to cover.
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| `backgroundColor` | `Color` | `'rgba(0, 0, 0, 0.1)'` | Arc fill color.
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| `borderAlign` | `string` | `'center'` | Arc stroke alignment.
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| `borderColor` | `Color` | `'#fff'` | Arc stroke color.
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| `borderWidth`| `number` | `2` | Arc stroke width.
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