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Fabric.js Polyline borderScaleFactor Property

  • Last Updated : 22 Jan, 2021

In this article, we are going to see how to scale the controlling borders of canvas Polyline using FabricJS. The canvas means Polyline is movable and can be stretched according to requirement. Further, the ellipse can be customized when it comes to initial stroke color, fill color, stroke width, or radius.

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 that will contain our Polyline. After this, we will initialize instances of Canvas and Polyline provided by FabricJS and scale the controlling borders of canvas Polyline using borderScaleFactor property, and render the Polyline on the Canvas as given in the below example.

Syntax :

var polyline = new fabric.Polyline(Points, {  
    borderScaleFactor: number
});  

Parameters: This property accepts a single parameter as mentioned above and described below:

  • borderScaleFactor: borderScaleFactor: It specifies the scale factor of the controlling borders.

The below example illustrates the borderScaleFactorproperty in Fabric.js:



Example:

HTML




<!DOCTYPE html> 
<html
<head
  
    <!-- Loading the FabricJS library -->
    <script src
    </script
</head
  
<body
    <div style="text-align: center;width: 600px;"
        <h1 style="color: green;"
            GeeksforGeeks 
        </h1
        <b
            Fabric.js | Polyline borderScaleFactor Property 
        </b
    </div
  
    <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 polyline instance 
        var polyline = new fabric.Polyline([ 
        { x: 200, 
            y: 10 }, 
        {x: 250, 
            y: 50 
        }, { 
            x: 250, 
            y: 180 
        }, { 
            x: 150, 
            y: 180 
        }, { 
            x: 150, 
            y: 50 
        }, { 
            x: 200, 
            y: 10 }], { 
            borderColor: 'green',
            borderScaleFactor: 3 
        }); 
  
        // Render the polyline in canvas 
        canvas.add(polyline); 
    </script
</body
  
</html>

Output:

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