Fabric.js | Triangle borderScaleFactor Property

In this article, we are going to see how to enable the border scaling of the canvas Triangle using FabricJS. The canvas triangle means the triangle is movable and can be stretched according to requirement. Further, the triangle can be customized when it comes to initial stroke color, height, width, fill color, or stroke width.

To make this possible we are going to use a JavaScript library called FabricJS. After importing the library, we will create a canvas block in the body tag which will contain the triangle. After this, we will initialize instances of Canvas and triangle provided by FabricJS and enable the border scaling of the canvas triangle using borderScaleFactor property and render the triangle on the Canvas as given below.


    width: number,
    height: number,
    borderScaleFactor: number

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

  • width: It specifies the width of triangle.
  • height: It specifies the height of triangle.
  • borderScaleFactor: This parameter defines whether to enable or disable border scaling and how much.

Example: This example uses FabricJS to enable the border scaling of the canvas-like triangle as given below. Try scaling the object after enabling border scaling.





<!DOCTYPE html> 
        Fabric.js | Triangle borderScaleFactor Property 
    <!-- Adding the FabricJS library -->
    <script src
        <div style="text-align: center;width: 600px;"
        <h1 style="color: green;"
            Fabric.js | Triangle borderScaleFactor Property 
    <canvas id="canvas" width="600" height="200"
        style="border:1px solid #000000"
        // Initiate a Canvas instance 
        var canvas = new fabric.Canvas("canvas"); 
        // Initiate a triangel instance 
        var triangle = new fabric.Triangle({
                        width: 150, 
                        height: 100, 
                        fill: '', 
                        stroke: 'green', 
                        strokeWidth: 3, 
                        cornerColor: 'blue', 
                        borderScaleFactor: 5
        // Render the triangel in canvas 




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