How to set the vertical scale factor of Circle using FabricJS?

FabricJSJavascriptHTML5 Canvas

In this tutorial, we are going to learn how to set the vertical 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 vertical scale of a circle object. This can be done by using the scaleY property.

Syntax

new fabric.Circle({ scaleY : 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 scaleY is a property.

Options Keys

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

Example 1

Default appearance when scaleY is not used

Let's see an example that displays the appearance of our circle object when the scaleY property is not used. By default, the vertical scale factor of the circle object is 1. scaleY determines the transformation that resizes an object along the Y-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 vertical scale factor of a Circle using FabricJS</h2>
      <p>Notice the vertical scale factor of the circle. Here we have not used the <b>scaleY</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 scaleY property as key

In this example, we are passing the scaleY property as a key with a value of 2. This means that the circle object's scale factor in the vertical 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 vertical scale factor of a Circle using FabricJS</h2>
      <p>Notice the vertical scale factor of the circle. Here we have set <b>scaleY</b> at 2, so the object appears elongated on the Y-axis. </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",
            scaleY: 2
         });
         canvas.add(circle);
         canvas.setWidth(document.body.scrollWidth);
         canvas.setHeight(250);
      </script>
   </body>
</html>
raja
Updated on 27-May-2022 08:05:37

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