---
title: Polar Area Chart
---

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.

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.

import { useEffect } from 'react';

export const ExampleChart = () => {
  useEffect(() => {
    const cfg = {
      type: 'polarArea',
      data: {
        labels: [
          'Red',
          'Green',
          'Yellow',
          'Grey',
          'Blue'
        ],
        datasets: [{
          label: 'My First Dataset',
          data: [11, 16, 7, 3, 14],
          backgroundColor: [
            'rgb(255, 99, 132)',
            'rgb(75, 192, 192)',
            'rgb(255, 205, 86)',
            'rgb(201, 203, 207)',
            'rgb(54, 162, 235)'
          ]
        }]
      }
    };
    new Chart(document.getElementById('chartjs-0').getContext('2d'), cfg);
  });
  return <div className="chartjs-wrapper"><canvas id="chartjs-0" className="chartjs"></canvas></div>;
}

<ExampleChart/>

## Example Usage

```javascript
new Chart(ctx, {
    data: data,
    type: 'polarArea',
    options: options
});
```

## Dataset Properties

The following options can be included in a polar area chart dataset to configure options for that specific dataset.

| Name | Type | [Scriptable](../general/options.md#scriptable-options) | [Indexable](../general/options.md#indexable-options) | Default
| ---- | ---- | :----: | :----: | ----
| [`backgroundColor`](#styling) | [`Color`](../general/colors.md) | Yes | Yes | `'rgba(0, 0, 0, 0.1)'`
| [`borderAlign`](#border-alignment) | `string` | Yes | Yes | `'center'`
| [`borderColor`](#styling) | [`Color`](../general/colors.md) | Yes | Yes | `'#fff'`
| [`borderWidth`](#styling) | `number` | Yes | Yes | `2`
| [`clip`](#general) | <code>number&#124;object</code> | - | - | `undefined`
| [`data`](#data-structure) | `number[]` | - | - | **required**
| [`hoverBackgroundColor`](#interations) | [`Color`](../general/colors.md) | Yes | Yes | `undefined`
| [`hoverBorderColor`](#interactions) | [`Color`](../general/colors.md) | Yes | Yes | `undefined`
| [`hoverBorderWidth`](#interactions) | `number` | Yes | Yes | `undefined`

### General

| Name | Description
| ---- | ----
| `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}`

### Styling

The style of each arc can be controlled with the following properties:

| Name | Description
| ---- | ----
| `backgroundColor` | arc background color.
| `borderColor` | arc border color.
| `borderWidth` | arc border width (in pixels).

All these values, if `undefined`, fallback to the associated [`elements.arc.*`](../configuration/elements.md#arc-configuration) options.

### Border Alignment

The following values are supported for `borderAlign`.

* `'center'` (default)
* `'inner'`

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 are not overlap.

### Interactions

The interaction with each arc can be controlled with the following properties:

| Name | Description
| ---- | -----------
| `hoverBackgroundColor` | arc background color when hovered.
| `hoverBorderColor` | arc border color when hovered.
| `hoverBorderWidth` | arc border width when hovered (in pixels).

All these values, if `undefined`, fallback to the associated [`elements.arc.*`](../configuration/elements.md#arc-configuration) options.

## Config Options

These are the customisation options specific to Polar Area charts. These options are merged with the [global chart default options](#default-options), and form the options of the chart.

| Name | Type | Default | Description
| ---- | ---- | ------- | -----------
| `startAngle` | `number` | `0` | Starting angle to draw arcs for the first item in a dataset. In degrees, 0 is at top.
| `animation.animateRotate` | `boolean` | `true` | If true, the chart will animate in with a rotation animation. This property is in the `options.animation` object.
| `animation.animateScale` | `boolean` | `true` | If true, will animate scaling the chart from the center outwards.

The polar area chart uses the [radialLinear](../axes/radial/linear.md) scale. Additional configuration is provided via the scale.

## Default Options

We can also change these defaults values for each PolarArea type that is created, this object is available at `Chart.defaults.polarArea`. Changing the global options only affects charts created after the change. Existing charts are not changed.

For example, to configure all new polar area charts with `animateScale = false` you would do:

```javascript
Chart.defaults.polarArea.animation.animateScale = false;
```

## Data Structure

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.

You also need to specify an array of labels so that tooltips appear correctly for each slice.

```javascript
data = {
    datasets: [{
        data: [10, 20, 30]
    }],

    // These labels appear in the legend and in the tooltips when hovering different arcs
    labels: [
        'Red',
        'Yellow',
        'Blue'
    ]
};
```
