How to set the height of an Ellipse using FabricJS?

In this tutorial, we are going to learn how to set the height of an Ellipse using FabricJS. Ellipse is one of the various shapes provided by FabricJS. In order to create an ellipse, we will create an instance of fabric.Ellipse class and add it to the canvas. We can manipulate an ellipse object by changing its position, opacity, stroke and also its dimension. FabricJS allows us to control an object's dimensions by using the width and height properties.

Syntax

new fabric.Ellipse({ height: Number }: Object)

Parameters

options (optional) − This parameter is an Object which provides additional customizations to our ellipse. Using this parameter color, cursor, stroke width and a lot of other properties can be changed related to the object of which height is a property.

Options Keys

height − This property accepts a Number allows us to specify the object's height. The value that is assigned, determines the height.

Example 1

Default behaviour of height property

Let's take an example to understand the default behaviour of the height property.

<!DOCTYPE html>
<html>
   <head>
      <!-- Adding the Fabric JS Library-->
      <script src="https://cdnjs.cloudflare.com/ajax/libs/fabric.js/510/fabric.min.js"></script>
   </head>

   <body>
      <h2>How to set the height of an Ellipse using FabricJS?</h2>
      <p>Here we have set the dimensions of the ellipse by passing the horizonal and vertical radius, <b>rx</b> and <b>ry</b>. We have not used the <b>height</b> property. </p>
      <canvas id="canvas"></canvas>

      <script>
         // Initiate a canvas instance
         var canvas = new fabric.Canvas("canvas");

         // Initiate an ellipse instance
         var ellipse = new fabric.Ellipse({
            left: 100,
            top: 100,
            fill: "white",
            rx: 100,
            ry: 60,
            stroke: "#c154c1",
            strokeWidth: 5,
         });

         // Adding it to the canvas
         canvas.add(ellipse);
         canvas.setWidth(document.body.scrollWidth);
         canvas.setHeight(250);
      </script>
   </body>
</html>

Example 2

Passing height property as key

Since the dimensions of an ellipse are determined by its horizontal and vertical radius, there will not be any changes in its size.

<!DOCTYPE html>
<html>
   <head>
      <!-- Adding the Fabric JS Library-->
      <script src="https://cdnjs.cloudflare.com/ajax/libs/fabric.js/510/fabric.min.js"></script>
   </head>

   <body>
      <h2>How to set the height of an Ellipse using FabricJS?</h2>
      <p>There is no change in the dimensions of the ellipse even though we have used the <b>height</b> property. This is because the dimensions are controlled by the horizontal and vertical radius, <b>rx</b> and <b>ry</b>. </p>
      <canvas id="canvas"></canvas>

      <script>
         // Initiate a canvas instance
         var canvas = new fabric.Canvas("canvas");

         // Initiate an ellipse instance
         var ellipse = new fabric.Ellipse({
            top: 100,
            left: 100,
            fill: "white",
            rx: 100,
            ry: 60,
            height: 90,
            stroke: "#c154c1",
            strokeWidth: 5,
         });

         // Adding it to the canvas
         canvas.add(ellipse);
         canvas.setWidth(document.body.scrollWidth);
         canvas.setHeight(250);
      </script>
   </body>
</html>