How to create a canvas ellipse using Fabric.js ?

Last Updated : 07 Feb, 2023

In this article, we are going to see how to create a canvas ellipse using FabricJS. The canvas means the ellipse is movable and can be stretched according to requirements. 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 render the Ellipse on Canvas as given in the example below.

Syntax:

fabric.Ellipse({
    rx: number,
    ry: number,
    radius: number,
    fill: string,
    stroke: string,
    strokeWidth: int
});

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

rx: It specifies the horizontal radius.
ry: It specifies the vertical radius.
radius: It specifies the radius.
fill: It specifies the fill color.
stroke: It specifies the stroke color.
strokeWidth: It specifies the width of the stroke.

Example: This example uses FabricJS to create a simple editable canvas-like ellipse as given below:

html

<!DOCTYPE html> 
<html> 
<head> 
    <title> 
        How to create a canvas-type 
        ellipse with JavaScript? 
    </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, 
            fill: '', 
            stroke: 'green', 
            strokeWidth: 3 
        }); 
          
        // Render the Ellipse in canvas 
        canvas.add(ellipse); 
    </script> 
</body> 
</html>