Fabric.js | Triangle transparentCorners Property

Last Updated : 24 Apr, 2023

In this article, we are going to see how to set the visibility of the corner of a canvas triangle using FabricJS. The canvas 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, 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 which will contain our triangle. After this, we will initialize instances of Canvas and Triangle provided by FabricJS and set the visibility of the corner of the triangle using transparentCorners property respectively, and render the triangle on the Canvas as given in the example below.

Syntax:

fabric.Triangle({
    width: number,
    height: number,
    cornerStrokeColor: string,
    transparentCorner: boolean
});

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

width: It specifies the width of the triangle.
height: It specifies the height of the triangle.
cornerStrokeColor: It specifies the stroke color of the controlling corners.
transparentCorner: It specifies whether to make the controlling corners visible or not.

Example: This example uses FabricJS to set the visibility of the corner of a canvas triangle.

html

<!DOCTYPE html> 
<html> 
 
<head> 
    <title> 
        Fabric.js | Triangle transparentCorners Property 
    </title> 
     
    <!-- Adding the FabricJS library -->
    <script src= 
"https://cdnjs.cloudflare.com/ajax/libs/fabric.js/3.6.2/fabric.min.js"> 
    </script> 
</head> 
 
<body> 
        <div style="text-align: center;width: 600px;"> 
        <h1 style="color: green;"> 
            GeeksforGeeks 
        </h1> 
        <b> 
            Fabric.js | Triangle transparentCorners 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 triangle instance 
        var triangle = new fabric.Triangle({
                        width: 150, 
                        height: 100, 
                        fill: '', 
                        stroke: 'green', 
                        strokeWidth: 3, 
                        cornerColor: 'cyan', 
                        cornerStrokeColor: 'red', 
                        transparentCorners: false 
        });
 
        // Render the triangle in canvas 
        canvas.add(triangle); 
        canvas.centerObject(triangle); 
    </script> 
</body> 
 
</html>                    