Fabric.js | Ellipse centeredScaling Property

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

Approach: 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 ellipse. After this, we will initialize instances of Canvas and Ellipse provided by FabricJS and enable the centered scaling of canvas ellipse using centeredScaling property and render the Ellipse on the Canvas as given below.

Syntax:

fabric.Ellipse({
    rx: number,
    ry: number,
    centeredScaling: boolean
});

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

rx: It specifies the horizontal radius.
ry: It specifies the vertical radius.
centeredScaling: It specifies whether to enable or disable centered scaling.

Example: This example uses FabricJS to enable the centered scaling of the canvas-like ellipse as given below. Try scaling the object after enabling centered scaling, it will scale from all sides when you will scale it.

<!DOCTYPE html> 

<html> 

<head> 

    <title> 

        Fabric.js | Ellipse centeredScaling Property 

    </title> 

    <!-- Loading the FabricJS library -->

    <script src= 

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

    </script> 

</head> 

<body> 

    <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 Ellipse instance 

        var ellipse = new fabric.Ellipse({ 

            rx: 80, 

            ry: 40, 

            centeredScaling: true 

        }); 

        // Render the Ellipse in canvas 

        canvas.add(ellipse); 

    </script> 

</body> 

</html>

Output:

Article Tags :

JavaScript

Web Technologies

Fabric.js