How to lock rotational movement of a canvas circle using Fabric.js ?

In this article, we are going to see how to lock the rotational movement of a canvas circle using FabricJS. The canvas means the circle is movable and can be stretched according to requirement. Further, the circle can be customized when it comes to initial stroke color, fill color, stroke width, or radius.

Approach: To make it possible, we are going to use a JavaScript library called FabricJS. After importing the library using CDN, we will create a canvas block in the body tag which will contain our circle. After this, we will initialize instances of Canvas and Circle provided by FabricJS and lock the rotational movement of the circle using lockRotation property and render the Circle on the Canvas as given in the example below.

Syntax:

fabric.Circle({
    radius: number,
    lockRotation: boolean
}); 

Parameters: This function accepts two parameters as mentioned above and described below:

  • radius: It specifies the radius.
  • lockRotation: It specifies whether to lock the rotational movement or not.

Example: This example uses FabricJS to lock the rotational movement of a canvas circle.

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<!DOCTYPE html>
<html>
  
<head>
    <title
        How to lock the rotational movement
        a canvas circle using FabricJS?
    </title>
  
    <!-- FabricJS CDN -->
    <script src=
    </script>
</head>
  
<body>
    <canvas id="canvas" width="600" height="200"
        style="border:1px solid #000000">
    </canvas>
  
    <script>
  
        // Initiate a Canvas instance
        var canvas = new fabric.Canvas("canvas");
  
        // Initiate a Circle instance
        var circle = new fabric.Circle({
            radius: 50,
            lockRotation: true
        });
  
        // Render the circle in canvas
        canvas.add(circle);
    </script>
</body>
  
</html>

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Output:

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