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Fabric.js | Triangle opacity Property
  • Last Updated : 27 May, 2020

In this article, we are going to see how to set the opacity of a 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 set the opacity of the triangle using opacity property and render the Triangle on the Canvas as given in the example below.

Syntax:

fabric.Triangle({
    width: number,
    height: number,
    opacity: 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.
  • opacity: It specifies the opacity of the canvas triangle.

Example: This example uses FabricJS to create simple editable canvas triangle.




<!DOCTYPE html> 
<html> 
  
<head> 
    <title> 
        Fabric.js | Triangle opacity Property
    </title> 
      
    <!-- Adding the FabricJS library -->
    <script src= 
    </script> 
</head> 
  
<body> 
    <center>
      <h1 style="color: green;">
       GeeksforGeeks
      </h1>
      <b>
       Fabric.js | Triangle opacity 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,
            opacity: 0
        });
  
        // Render the Triangle in canvas 
        canvas.add(triangle); 
        canvas.centerObject(triangle);
    </script> 
</body> 
  
</html>

Output:




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