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Fabric.js | Ellipse cornerSize Property

Last Updated : 13 May, 2020
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In this article, we are going to see how to set the size of controlling corners 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 that will contain our ellipse. After this, we will initialize instances of Canvas and Ellipse provided by FabricJS and set the size of controlling corners of canvas ellipse using cornerSize property and render the Ellipse on the Canvas as given in the below example.


    rx: number,
    ry: number,
    cornerSize: number

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

  • rx: It specifies the horizontal radius.
  • ry: It specifies the vertical radius.
  • cornerSize: It specifies the size of the controlling corners.

Program: This example uses FabricJS to set the size of controlling corners of the canvas-like ellipse as given below. You have to click on the object to see the size of controlling corners.

<!DOCTYPE html>
        Fabric.js | Ellipse cornerSize Property
    <!-- Loading the FabricJS library -->
    <script src=
    <canvas id="canvas" width="600" height="200" 
        style="border:1px solid #000000">
        // Initiate a Canvas instance
        var canvas = new fabric.Canvas("canvas");
        // Initiate a Ellipse instance
        var ellipse = new fabric.Ellipse({
            rx: 80,
            ry: 40,
            cornerSize: 30
        // Render the Ellipse in canvas


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