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150 lines
5.0 KiB
Markdown
150 lines
5.0 KiB
Markdown
# Polar Area Chart
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Polar area charts are similar to pie charts, but each segment has the same angle - the radius of the segment differs depending on the value.
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This type of chart is often useful when we want to show a comparison data similar to a pie chart, but also show a scale of values for context.
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```js chart-editor
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// <block:setup:1>
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const data = {
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labels: [
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'Red',
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'Green',
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'Yellow',
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'Grey',
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'Blue'
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],
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datasets: [{
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label: 'My First Dataset',
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data: [11, 16, 7, 3, 14],
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backgroundColor: [
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'rgb(255, 99, 132)',
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'rgb(75, 192, 192)',
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'rgb(255, 205, 86)',
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'rgb(201, 203, 207)',
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'rgb(54, 162, 235)'
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]
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}]
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};
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// </block:setup>
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// <block:config:0>
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const config = {
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type: 'polarArea',
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data: data,
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};
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// </block:config>
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module.exports = {
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actions: [],
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config: config,
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};
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```
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## Example Usage
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```javascript
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new Chart(ctx, {
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data: data,
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type: 'polarArea',
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options: options
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});
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```
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## Dataset Properties
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The following options can be included in a polar area chart dataset to configure options for that specific dataset.
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| Name | Type | [Scriptable](../general/options.md#scriptable-options) | [Indexable](../general/options.md#indexable-options) | Default
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| ---- | ---- | :----: | :----: | ----
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| [`backgroundColor`](#styling) | [`Color`](../general/colors.md) | Yes | Yes | `'rgba(0, 0, 0, 0.1)'`
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| [`borderAlign`](#border-alignment) | `string` | Yes | Yes | `'center'`
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| [`borderColor`](#styling) | [`Color`](../general/colors.md) | Yes | Yes | `'#fff'`
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| [`borderWidth`](#styling) | `number` | Yes | Yes | `2`
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| [`clip`](#general) | `number`\|`object` | - | - | `undefined`
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| [`data`](#data-structure) | `number[]` | - | - | **required**
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| [`hoverBackgroundColor`](#interations) | [`Color`](../general/colors.md) | Yes | Yes | `undefined`
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| [`hoverBorderColor`](#interactions) | [`Color`](../general/colors.md) | Yes | Yes | `undefined`
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| [`hoverBorderWidth`](#interactions) | `number` | Yes | Yes | `undefined`
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### General
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| Name | Description
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| ---- | ----
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| `clip` | How to clip relative to chartArea. Positive value allows overflow, negative value clips that many pixels inside chartArea. `0` = clip at chartArea. Clipping can also be configured per side: `clip: {left: 5, top: false, right: -2, bottom: 0}`
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### Styling
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The style of each arc can be controlled with the following properties:
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| Name | Description
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| ---- | ----
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| `backgroundColor` | arc background color.
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| `borderColor` | arc border color.
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| `borderWidth` | arc border width (in pixels).
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All these values, if `undefined`, fallback to the associated [`elements.arc.*`](../configuration/elements.md#arc-configuration) options.
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### Border Alignment
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The following values are supported for `borderAlign`.
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* `'center'` (default)
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* `'inner'`
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When `'center'` is set, the borders of arcs next to each other will overlap. When `'inner'` is set, it is guaranteed that all the borders do not overlap.
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### Interactions
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The interaction with each arc can be controlled with the following properties:
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| Name | Description
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| ---- | -----------
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| `hoverBackgroundColor` | arc background color when hovered.
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| `hoverBorderColor` | arc border color when hovered.
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| `hoverBorderWidth` | arc border width when hovered (in pixels).
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All these values, if `undefined`, fallback to the associated [`elements.arc.*`](../configuration/elements.md#arc-configuration) options.
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## Config Options
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These are the customisation options specific to Polar Area charts. These options are looked up on access, and form together with the [global chart default options](#default-options) the options of the chart.
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| Name | Type | Default | Description
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| ---- | ---- | ------- | -----------
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| `animation.animateRotate` | `boolean` | `true` | If true, the chart will animate in with a rotation animation. This property is in the `options.animation` object.
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| `animation.animateScale` | `boolean` | `true` | If true, will animate scaling the chart from the center outwards.
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The polar area chart uses the [radialLinear](../axes/radial/linear.md) scale. Additional configuration is provided via the scale.
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## Default Options
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We can also change these default values for each PolarArea type that is created, this object is available at `Chart.overrides.polarArea`. Changing the global options only affects charts created after the change. Existing charts are not changed.
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For example, to configure all new polar area charts with `animateScale = false` you would do:
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```javascript
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Chart.overrides.polarArea.animation.animateScale = false;
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```
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## Data Structure
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For a polar area chart, datasets need to contain an array of data points. The data points should be a number, Chart.js will total all of the numbers and calculate the relative proportion of each.
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You also need to specify an array of labels so that tooltips appear correctly for each slice.
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```javascript
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data = {
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datasets: [{
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data: [10, 20, 30]
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}],
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// These labels appear in the legend and in the tooltips when hovering different arcs
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labels: [
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'Red',
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'Yellow',
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'Blue'
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]
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};
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```
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