Syntax error How to lock the flipping during scaling of Circle using FabricJS?

How to lock the flipping during scaling of Circle using FabricJS?

In this tutorial, we are going to learn how to lock the flipping during scaling of a Circle using FabricJS. Just as we can specify the position, colour, opacity and dimension of a circle object in the canvas, we can also stop flipping of an object during scaling. This can be done by using the lockScalingFlip property.

Syntax

new fabric.Circle({ lockScalingFlip : Boolean }: 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 lockScalingFlip is a property.

Options Keys

  • lockScalingFlip − This property accepts a Boolean value. If we assign it a 'true' value, then the object will not be allowed to flip during scaling.

Example 1

Default behaviour of a Circle object in the canvas

Let's see an example to understand the default behaviour of a Circle object when lockScalingFlip property is not used.

<!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 lock the flipping during scaling of circle using FabricJS</h2>
      <p>Select the circle and try to scale it up or down. You will notice that the circle flips while scaling. This is the default behavior. Here we haven't used the <b>lockScalingFlip</b> property but by default it is set to False.</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,
            fill: "white",
            radius: 50,
            stroke: "black",
            strokeWidth: 5,
         });

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

Example 2

Passing lockScalingFlip as key with 'true' value

In this example, we will see how we can cease the ability of a circle object to flip while scaling by using the lockScalingFlip property. As we can see, although we try to flip the circle object, it is no longer allowed.

<!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 lock the flipping during scaling of circle using FabricJS</h2>
      <p>Select the object and try to scale it up or down. Observe that the circle will no longer flip during scaling, as we have set <b>lockScalingFlip</b> to True. </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,
            fill: "white",
            radius: 50,
            stroke: "black",
            strokeWidth: 5,
            lockScalingFlip: true
         });

         // Adding it to the canvas
         canvas.add(circle);
         canvas.setWidth(document.body.scrollWidth);
         canvas.setHeight(250);
      </script>
   </body>
</html>
Updated on: 2022-05-25T09:12:32+05:30

149 Views

Kickstart Your Career

Get certified by completing the course

Get Started
Advertisements