Fabric.js Circle perPixelTargetFind Property

In this article, we are going to see how to set the value of perPixelTargetFind property of a canvas circle using FabricJS. The canvas circle means the circle is movable and can be stretched according to requirement. Further, the circle can be customized when it comes to initial stroke color, height, width, fill color, or stroke width.

Approach:

To make it possible, we are going to use a JavaScript HTML5 canvas library called FabricJS.
After importing the library, we will create a canvas block in the body tag which will contain the circle.
After this, we will initialize instances of Canvas and circle provided by FabricJS and set the perPixelTargetFind property value of the circle using perPixelTargetFind property and render the circle on the Canvas as given in the example below.

Syntax:

fabric.Circle({
   radius: number,
   perPixelTargetFind: boolean
});

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

radius: It specifies the radius of circle.
perPixelTargetFind: It specifies the string value of perPixelTargetFind property.

Example: This example uses FabricJS to set the perPixelTargetFind property of a canvas circle.

HTML

<!DOCTYPE html> 

<html> 

<head> 

    <title> 

        Fabric.js Circle perPixelTargetFind Property 

    </title> 

    <!-- FabricJS CDN -->

    <script src= 

"https://cdnjs.cloudflare.com/ajax/libs/fabric.js/3.6.2/fabric.min.js"> 

    </script> 

</head> 

<body> 

    <h1 style="color: green;"> 

        GeeksforGeeks 

    </h1> 

    <h3> 

        Fabric.js Circle perPixelTargetFind Property 

    </h3> 

    <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 Circle instance  

        var circle = new fabric.Circle({ 

            radius: 100, 

            fill: '', 

            stroke: 'green', 

            strokeWidth: 3, 

            perPixelTargetFind: true 

        }); 

        // Render the circle in canvas  

        canvas.add(circle); 

        canvas.centerObject(circle); 

    </script> 

</body> 

</html>

Output:

Article Tags :

JavaScript

Web Technologies

Fabric.js