181 lines
7.0 KiB
Markdown
181 lines
7.0 KiB
Markdown
# Radar
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A radar chart is a way of showing multiple data points and the variation between them.
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They are often useful for comparing the points of two or more different data sets.
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{% chartjs %}
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{
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"type": "radar",
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"data": {
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"labels": [
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"Eating",
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"Drinking",
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"Sleeping",
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"Designing",
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"Coding",
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"Cycling",
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"Running"
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],
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"datasets": [{
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"label": "My First Dataset",
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"data": [65, 59, 90, 81, 56, 55, 40],
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"fill": true,
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"backgroundColor": "rgba(255, 99, 132, 0.2)",
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"borderColor": "rgb(255, 99, 132)",
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"pointBackgroundColor": "rgb(255, 99, 132)",
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"pointBorderColor": "#fff",
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"pointHoverBackgroundColor": "#fff",
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"pointHoverBorderColor": "rgb(255, 99, 132)",
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"fill": true
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}, {
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"label": "My Second Dataset",
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"data": [28, 48, 40, 19, 96, 27, 100],
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"fill": true,
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"backgroundColor": "rgba(54, 162, 235, 0.2)",
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"borderColor": "rgb(54, 162, 235)",
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"pointBackgroundColor": "rgb(54, 162, 235)",
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"pointBorderColor": "#fff",
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"pointHoverBackgroundColor": "#fff",
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"pointHoverBorderColor": "rgb(54, 162, 235)",
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"fill": true
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}]
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},
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"options": {
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"elements": {
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"line": {
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"tension": 0,
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"borderWidth": 3
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}
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}
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}
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}
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{% endchartjs %}
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## Example Usage
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```javascript
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var myRadarChart = new Chart(ctx, {
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type: 'radar',
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data: data,
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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 radar chart allows a number of properties to be specified for each dataset. These are used to set display properties for a specific dataset. For example, the colour of a line is generally set this way.
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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`](#line-styling) | [`Color`](../general/colors.md) | - | - | `'rgba(0, 0, 0, 0.1)'`
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| [`borderCapStyle`](#line-styling) | `string` | - | - | `'butt'`
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| [`borderColor`](#line-styling) | [`Color`](../general/colors.md) | - | - | `'rgba(0, 0, 0, 0.1)'`
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| [`borderDash`](#line-styling) | `number[]` | - | - | `[]`
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| [`borderDashOffset`](#line-styling) | `number` | - | - | `0.0`
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| [`borderJoinStyle`](#line-styling) | `string` | - | - | `'miter'`
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| [`borderWidth`](#line-styling) | `number` | - | - | `3`
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| [`fill`](#line-styling) | <code>boolean|string</code> | - | - | `true`
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| [`label`](#general) | `string` | - | - | `''`
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| [`lineTension`](#line-styling) | `number` | - | - | `0.4`
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| [`pointBackgroundColor`](#point-styling) | `Color` | Yes | Yes | `'rgba(0, 0, 0, 0.1)'`
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| [`pointBorderColor`](#point-styling) | `Color` | Yes | Yes | `'rgba(0, 0, 0, 0.1)'`
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| [`pointBorderWidth`](#point-styling) | `number` | Yes | Yes | `1`
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| [`pointHitRadius`](#point-styling) | `number` | Yes | Yes | `1`
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| [`pointHoverBackgroundColor`](#interactions) | `Color` | Yes | Yes | `undefined`
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| [`pointHoverBorderColor`](#interactions) | `Color` | Yes | Yes | `undefined`
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| [`pointHoverBorderWidth`](#interactions) | `number` | Yes | Yes | `1`
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| [`pointHoverRadius`](#interactions) | `number` | Yes | Yes | `4`
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| [`pointRadius`](#point-styling) | `number` | Yes | Yes | `3`
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| [`pointRotation`](#point-styling) | `number` | Yes | Yes | `0`
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| [`pointStyle`](#point-styling) | <code>string|Image</code> | Yes | Yes | `'circle'`
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### General
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| Name | Description
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| ---- | ----
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| `label` | The label for the dataset which appears in the legend and tooltips.
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### Point Styling
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The style of each point can be controlled with the following properties:
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| Name | Description
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| ---- | ----
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| `pointBackgroundColor` | The fill color for points.
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| `pointBorderColor` | The border color for points.
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| `pointBorderWidth` | The width of the point border in pixels.
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| `pointHitRadius` | The pixel size of the non-displayed point that reacts to mouse events.
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| `pointRadius` | The radius of the point shape. If set to 0, the point is not rendered.
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| `pointRotation` | The rotation of the point in degrees.
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| `pointStyle` | Style of the point. [more...](../configuration/elements#point-styles)
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All these values, if `undefined`, fallback first to the dataset options then to the associated [`elements.point.*`](../configuration/elements.md#point-configuration) options.
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### Line Styling
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The style of the line can be controlled with the following properties:
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| Name | Description
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| ---- | ----
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| `backgroundColor` | The line fill color.
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| `borderCapStyle` | Cap style of the line. See [MDN](https://developer.mozilla.org/en-US/docs/Web/API/CanvasRenderingContext2D/lineCap).
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| `borderColor` | The line color.
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| `borderDash` | Length and spacing of dashes. See [MDN](https://developer.mozilla.org/en-US/docs/Web/API/CanvasRenderingContext2D/setLineDash).
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| `borderDashOffset` | Offset for line dashes. See [MDN](https://developer.mozilla.org/en-US/docs/Web/API/CanvasRenderingContext2D/lineDashOffset).
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| `borderJoinStyle` | Line joint style. See [MDN](https://developer.mozilla.org/en-US/docs/Web/API/CanvasRenderingContext2D/lineJoin).
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| `borderWidth` | The line width (in pixels).
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| `fill` | How to fill the area under the line. See [area charts](area.md).
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| `lineTension` | Bezier curve tension of the line. Set to 0 to draw straightlines.
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All these values, if `undefined`, fallback to the associated [`elements.line.*`](../configuration/elements.md#line-configuration) options.
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### Interactions
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The interaction with each point can be controlled with the following properties:
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| Name | Description
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| ---- | -----------
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| `pointHoverBackgroundColor` | Point background color when hovered.
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| `pointHoverBorderColor` | Point border color when hovered.
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| `pointHoverBorderWidth` | Border width of point when hovered.
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| `pointHoverRadius` | The radius of the point when hovered.
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## Configuration Options
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Unlike other charts, the radar chart has no chart specific options.
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## Scale Options
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The radar chart supports only a single scale. The options for this scale are defined in the `scale` property.
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```javascript
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options = {
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scale: {
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// Hides the scale
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display: false
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}
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};
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```
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## Default Options
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It is common to want to apply a configuration setting to all created radar charts. The global radar chart settings are stored in `Chart.defaults.radar`. Changing the global options only affects charts created after the change. Existing charts are not changed.
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## Data Structure
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The `data` property of a dataset for a radar chart is specified as an array of numbers. Each point in the data array corresponds to the label at the same index.
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```javascript
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data: [20, 10]
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```
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For a radar chart, to provide context of what each point means, we include an array of strings that show around each point in the chart.
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```javascript
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data: {
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labels: ['Running', 'Swimming', 'Eating', 'Cycling'],
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datasets: [{
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data: [20, 10, 4, 2]
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}]
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}
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```
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