Radar Chart

A radar chart is a way of showing multiple data points and the variation between them.

They are often useful for comparing the points of two or more different data sets.

config setup

const config = {
  type: 'radar',
  data: data,
  options: {
    elements: {
      line: {
        borderWidth: 3
      }
    }
  },
};

const data = {
  labels: [
    'Eating',
    'Drinking',
    'Sleeping',
    'Designing',
    'Coding',
    'Cycling',
    'Running'
  ],
  datasets: [{
    label: 'My First Dataset',
    data: [65, 59, 90, 81, 56, 55, 40],
    fill: true,
    backgroundColor: 'rgba(255, 99, 132, 0.2)',
    borderColor: 'rgb(255, 99, 132)',
    pointBackgroundColor: 'rgb(255, 99, 132)',
    pointBorderColor: '#fff',
    pointHoverBackgroundColor: '#fff',
    pointHoverBorderColor: 'rgb(255, 99, 132)'
  }, {
    label: 'My Second Dataset',
    data: [28, 48, 40, 19, 96, 27, 100],
    fill: true,
    backgroundColor: 'rgba(54, 162, 235, 0.2)',
    borderColor: 'rgb(54, 162, 235)',
    pointBackgroundColor: 'rgb(54, 162, 235)',
    pointBorderColor: '#fff',
    pointHoverBackgroundColor: '#fff',
    pointHoverBorderColor: 'rgb(54, 162, 235)'
  }]
};

Dataset Properties

Namespaces:

• data.datasets[index] - options for this dataset only
• options.datasets.line - options for all line datasets
• options.elements.line - options for all line elements
• options.elements.point - options for all point elements
• options - options for the whole chart

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.

All these values, if undefined, fallback to the scopes described in option resolution

General

Point Styling

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

All these values, if undefined, fallback first to the dataset options then to the associated elements.point.* options.

Line Styling

The style of the line can be controlled with the following properties:

Name	Description
backgroundColor	The line fill color.
borderCapStyle	Cap style of the line. See MDN (opens new window).
borderColor	The line color.
borderDash	Length and spacing of dashes. See MDN (opens new window).
borderDashOffset	Offset for line dashes. See MDN (opens new window).
borderJoinStyle	Line joint style. See MDN (opens new window).
borderWidth	The line width (in pixels).
fill	How to fill the area under the line. See area charts.
tension	Bezier curve tension of the line. Set to 0 to draw straight lines.
spanGaps	If true, lines will be drawn between points with no or null data. If false, points with null data will create a break in the line.

If the value is undefined, the values fallback to the associated elements.line.* options.

Interactions

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

Scale Options

The radar chart supports only a single scale. The options for this scale are defined in the scales.r property, which can be referenced from the Linear Radial Axis page.

options = {
    scales: {
        r: {
            angleLines: {
                display: false
            },
            suggestedMin: 50,
            suggestedMax: 100
        }
    }
};

Default Options

It is common to want to apply a configuration setting to all created radar charts. The global radar chart settings are stored in Chart.overrides.radar. Changing the global options only affects charts created after the change. Existing charts are not changed.

Data Structure

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.

data: [20, 10]

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.

data: {
    labels: ['Running', 'Swimming', 'Eating', 'Cycling'],
    datasets: [{
        data: [20, 10, 4, 2]
    }]
}

Internal data format

{x, y}