Fabric.js | Rect strokeUniform Property

In this article, we are going to see how to lock the uniform stroke width of a canvas rectangle using FabricJS so that width of stroke remains the same even when we scale the object to a bigger size. The canvas means rectangle is movable and can be stretched according to requirement. Further, the rectangle can be customized when it comes to initial stroke color, fill color, stroke width, or size.

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 rectangle. After this, we will initialize instances of Canvas and Rect provided by FabricJS and lock uniform stroke width of the canvas rectangle using strokeUniform property and render the Rect on the Canvas as given in the example below.

Syntax:

fabric.Rect({
    width: number,
    height: number,
    strokeUniform: boolean
}); 

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

  • width: It specifies the horizontal length.
  • height: It specifies the vertical length.
  • strokeUniform: It specifies whether to lock uniform stroke width.

Example: This example uses FabricJS to lock uniform stroke width of the canvas rectangle.

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<!DOCTYPE html>
<html>
  
<head>
    <title
        Fabric.js | Rect strokeUniform Property
    </title>
  
    <!-- FabricJS CDN -->
    <script src=
    </script>
</head>
  
<body>
    <div style="text-align: center;width: 600px;">
        <h1 style="color: green;">
            GeeksforGeeks
        </h1>
        <b>
            Fabric.js | Rect strokeUniform Property
        </b>
    </div>
  
    <div style="text-align: center;">
    <canvas id="canvas" width="600" height="200" 
            style="border:1px solid #000000;">
    </canvas>
    </div>
  
    <script>
        // Initiate a Canvas instance
        var canvas = new fabric.Canvas("canvas");
  
        // Initiate a Rect instance
        var rect = new fabric.Rect({
            width: 200,
            height: 100,
            strokeUniform: true,
            stroke: 'red'
        });
  
        // Render the rectangle in canvas
        canvas.add(rect);
    </script>
</body>
  
</html>                   

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Output:

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