Radar

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.

Example Usage

var myRadarChart = new Chart(ctx, {
    type: 'radar',
    data: data,
    options: options
});

Dataset Properties

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 point* properties can be specified as an array. If these are set to an array value, the first value applies to the first point, the second value to the second point, and so on.

Name Type Description
label String The label for the dataset which appears in the legend and tooltips.
backgroundColor Color The fill color under the line. See Colors.
borderColor Color The color of the line. See Colors.
borderWidth Number The width of the line in pixels.
borderDash Number[] Length and spacing of dashes. See MDN.
borderDashOffset Number Offset for line dashes. See MDN.
borderCapStyle String Cap style of the line. See MDN.
borderJoinStyle String Line joint style. See MDN.
fill Boolean/String How to fill the area under the line. See area charts.
lineTension Number Bezier curve tension of the line. Set to 0 to draw straightlines.
pointBackgroundColor Color/Color[] The fill color for points.
pointBorderColor Color/Color[] The border color for points.
pointBorderWidth Number/Number[] The width of the point border in pixels.
pointRadius Number/Number[] The radius of the point shape. If set to 0, the point is not rendered.
pointRotation Number/Number[] The rotation of the point in degrees.
pointStyle String/String[]/Image/Image[] Style of the point. more...
pointHitRadius Number/Number[] The pixel size of the non-displayed point that reacts to mouse events.
pointHoverBackgroundColor Color/Color[] Point background color when hovered.
pointHoverBorderColor Color/Color[] Point border color when hovered.
pointHoverBorderWidth Number/Number[] Border width of point when hovered.
pointHoverRadius Number/Number[] The radius of the point when hovered.

pointStyle

The style of point. Options are:

  • 'circle'
  • 'cross'
  • 'crossRot'
  • 'dash'.
  • 'line'
  • 'rect'
  • 'rectRounded'
  • 'rectRot'
  • 'star'
  • 'triangle'

If the option is an image, that image is drawn on the canvas using drawImage.

Configuration Options

Unlike other charts, the radar chart has no chart specific options.

Scale Options

The radar chart supports only a single scale. The options for this scale are defined in the scale property.

options = {
    scale: {
        // Hides the scale
        display: false
    }
};

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.defaults.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 a an array of numbers. Each point in the data array corresponds to the label at the same index on the x axis.

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]
    }]
}

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