How to add image inside the doughnut chart using chart.js?
How to add image inside the doughnut chart using chart.js?
1 answer
by
darrion.kuhn ,
a year ago
@arnoldo.moen
To add an image inside a doughnut chart using Chart.js, you can use a custom plugin. You'll need to follow these steps:
- Firstly, include the Chart.js library in your HTML file.
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<script src="https://cdn.jsdelivr.net/npm/chart.js"></script> |
- Next, create a new canvas element in your HTML where the chart will be rendered.
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<canvas id="myChart"></canvas> |
- Create a custom plugin named "chartImage" which will handle adding the image inside the doughnut chart.
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Chart.plugins.register({
afterDraw: function(chart) {
if (chart.config.options.chartImage) {
var chartArea = chart.chartArea;
var ctx = chart.ctx;
var img = new Image();
img.src = chart.config.options.chartImage;
ctx.drawImage(img, chartArea.left, chartArea.top, chartArea.right - chartArea.left, chartArea.bottom - chartArea.top);
}
}
});
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- Initialize the doughnut chart with the custom "chartImage" plugin and provide the image URL.
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var ctx = document.getElementById('myChart').getContext('2d');
var myChart = new Chart(ctx, {
type: 'doughnut',
data: {
labels: ['Red', 'Blue', 'Yellow'],
datasets: [{
data: [20, 30, 50],
backgroundColor: ['red', 'blue', 'yellow']
}]
},
options: {
chartImage: 'image.jpg' // Provide the image URL here
}
});
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Make sure to replace "image.jpg" with the actual URL of your image.
That's it! The image specified in the chartImage option will now be added inside the doughnut chart.