How to set the horizontal scale factor of a Circle using FabricJS?

FabricJSJavascriptHTML5 Canvas

In this tutorial, we are going to learn how to set the horizontal scale factor of a Circle using FabricJS. Circle is one of the various shapes provided by FabricJS. In order to create a circle, we will have to create an instance of fabric.Circle class and add it to the canvas. Just as we can specify the position, colour, opacity and dimension of a circle object in the canvas, we can also set the horizontal scale of a circle object. This can be done by using the scaleX property.

Syntax

new fabric.Circle({ scaleX : Number }: Object)

Parameters

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

Options Keys

  • scaleX − This property accepts a Number value. The value that is assigned, determines the horizontal object scale factor. Its default value is 1.

Example 1

Default appearance when scaleX is not used

Let's see a code that displays the appearance of our circle object when the scaleX property is not used. By default, the horizontal scale factor of the circle object is 1. scaleX determines the transformation that resizes an object along the X-axis.

<!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>Setting the horizontal scale factor of circle using FabricJS</h2>
      <p>This is the default horizontal scale factor. We have not used the <b>scaleX</b> property, but by default, it is set to 1. </p>
      <canvas id="canvas"></canvas>

      <script>
         // Initiate a canvas instance
         var canvas = new fabric.Canvas("canvas");
         var circle = new fabric.Circle({
            left: 115,
            top: 50,
            padding: 7,
            radius: 50,
            fill: "#85bb65"
         });
         canvas.add(circle);
         canvas.setWidth(document.body.scrollWidth);
         canvas.setHeight(250);
      </script>
   </body>
</html>

Example 2

Passing scaleX property as key

In this example, we are passing the scaleX property as a key with a value of 2. This means that the circle object's scale factor in the horizontal direction is doubled.

<!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>Setting the horizontal scale factor of circle using FabricJS</h2>
      <p>Notice the horizontal scale factor of the object. Here we have set <b>scaleX</b> at 2, so the object appears stretched in the horizontal direction. </p>
      <canvas id="canvas"></canvas>
   
      <script>
         // Initiate a canvas instance
         var canvas = new fabric.Canvas("canvas");
         var circle = new fabric.Circle({
            left: 115,
            top: 50,
            padding: 7,
            radius: 50,
            scaleX: 2,
            fill: "#85bb65"
         });
         canvas.add(circle);
         canvas.setWidth(document.body.scrollWidth);
         canvas.setHeight(250);
      </script>
   </body>
</html>
raja
Updated on 25-May-2022 13:54:38

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