Doughnut and Pie

Pie and doughnut charts are probably the most commonly used charts. They are divided into segments, the arc of each segment shows the proportional value of each piece of data.

They are excellent at showing the relational proportions between data.

Pie and doughnut charts are effectively the same class in Chart.js, but have one different default value - their cutoutPercentage. This equates what percentage of the inner should be cut out. This defaults to 0 for pie charts, and 50 for doughnuts.

They are also registered under two aliases in the Chart core. Other than their different default value, and different alias, they are exactly the same.

Example Usage

// For a pie chart
var myPieChart = new Chart(ctx,{
    type: 'pie',
    data: data,
    options: options
// And for a doughnut chart
var myDoughnutChart = new Chart(ctx, {
    type: 'doughnut',
    data: data,
    options: options

Dataset Properties

The doughnut/pie 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 the dataset's arc are generally set this way.

Name Type Description
label String The label for the dataset which appears in the legend and tooltips.
backgroundColor Color[] The fill color of the arcs in the dataset. See Colors
borderColor Color[] The border color of the arcs in the dataset. See Colors
borderWidth Number[] The border width of the arcs in the dataset.
hoverBackgroundColor Color[] The fill colour of the arcs when hovered.
hoverBorderColor Color[] The stroke colour of the arcs when hovered.
hoverBorderWidth Number[] The stroke width of the arcs when hovered.

Config Options

These are the customisation options specific to Pie & Doughnut charts. These options are merged with the global chart configuration options, and form the options of the chart.

Name Type Default Description
cutoutPercentage Number 50 - for doughnut, 0 - for pie The percentage of the chart that is cut out of the middle.
rotation Number -0.5 * Math.PI Starting angle to draw arcs from.
circumference Number 2 * Math.PI Sweep to allow arcs to cover
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 false If true, will animate scaling the chart from the center outwards.

Default Options

We can also change these default values for each Doughnut type that is created, this object is available at Chart.defaults.doughnut. Pie charts also have a clone of these defaults available to change at Chart.defaults.pie, with the only difference being cutoutPercentage being set to 0.

Data Structure

For a pie 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

data = {
    datasets: [{
        data: [10, 20, 30]

    // These labels appear in the legend and in the tooltips when hovering different arcs
    labels: [

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