Fabric.js | Ellipse centeredRotation Property

Last Updated : 13 May, 2020

In this article, we are going to see how to disable the centered rotation 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 disable the centered rotation of canvas ellipse using centeredRotation property and render the Ellipse on the Canvas as given in the example below.

Syntax:

fabric.Ellipse({
    rx: number,
    ry: number,
    centeredRotation: 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.
centeredRotation: It specifies whether to enable or disable centered rotation.

Program: This example uses FabricJS to disable the centered rotation of canvas-like ellipse as given below. Try rotating the object after disabling centered rotation, it will use the upper-left corner as a center of rotation.

<!DOCTYPE html> 
<html> 
  
<head> 
    <title> 
        Fabric.js | Ellipse centeredRotation 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, 
            centeredRotation: false 
        }); 
  
        // Render the Ellipse in canvas 
        canvas.add(ellipse); 
    </script> 
</body> 
  
</html> 