How to rotate custom marker in chart.js?

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by kadin , in category: Javascript , 21 days ago

How to rotate custom marker in chart.js?

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1 answer

by edmond_brakus , 20 days ago

@kadin 

To rotate a custom marker in Chart.js, you can use the 'rotation' property for the marker options.


Here is an example:

  1. First, create a custom marker using an image or icon. You can use an image URL or an icon from a library like Font Awesome.
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var customMarker = new Image();
customMarker.src = 'path-to-custom-marker-image.png';


  1. In the chart options, define the marker options and set the 'rotation' property to the desired rotation angle in degrees.
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var options = {
    scales: {
        // Add your scales options here
    },
    plugins: {
        legend: {
            // Add your legend options here
        },
        tooltip: {
            // Add your tooltip options here
        },
        elements: {
            point: {
                rotation: 45, // Set the rotation angle here
                backgroundColor: customMarker // Use the custom marker image
            }
        }
    }
};


  1. Update the chart configuration and render the chart.
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var config = {
    type: 'line',
    data: {
        // Add your chart data here
    },
    options: options
};

var myChart = new Chart(ctx, config);


The marker will now be rotated at the specified angle. You can adjust the rotation angle according to your requirements.