Fabric.js | Triangle selectionBackgroundColor Property

In this article, we are going to see how to change the active background color 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 it 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 that will contain the triangle. After this, we will initialize instances of Canvas and Triangle provided by FabricJS and use the selectionBackgroundColor property to change the active background color and render the Canvas on the Triangle as given in the example below.

Syntax:

fabric.Triangle({
    width: number,
    height: number,
    selectionBackgroundColor: string
});

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.
  • selectionBackgroundColor: It specifies the color of the background when active.

Example: This example uses FabricJS to change the active background color of the canvas triangle. Note that we have to click on the text to see the active background color.

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<!DOCTYPE html> 
<html> 
  
<head> 
    <title> 
        Fabric.js | Triangle selectionBackgroundColor Property
    </title> 
      
    <!-- Adding the FabricJS library -->
    <script src= 
    </script> 
</head> 
  
<body>
    <center>
       <h1 style="color: green;">
        GeeksforGeeks
       </h1>
       <b>
        Fabric.js | Triangle selectionBackgroundColor Property
       </b>
    </center> 
    <canvas id="canvas" width="600" height="300"
        style="border:1px solid #000000"
    </canvas> 
      
    <script> 
      
        // Initiate a Canvas instance 
        var canvas = new fabric.Canvas("canvas"); 
  
        // Initiate a triangle instance 
        var triangle = new fabric.Triangle({
            width: 300,
            height: 150,
            fill: '',
            stroke: 'green',
            strokeWidth: 3,
            selectionBackgroundColor: '#e1e1e1'
        });
  
        // Render the Triangle in canvas 
        canvas.add(triangle); 
        canvas.centerObject(triangle);
    </script> 
</body> 
  
</html>

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Output:

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