How to set the size of the controlling corners of a Circle using FabricJS?

FabricJSJavascriptHTML5 Canvas

In this tutorial, we are going to learn how to set the size of the controlling corners of a Circle using FabricJS. The controlling corners of an object allow us to scale, stretch or change its position. We can customize our controlling corners in many ways such as adding a specific colour to it, changing its size etc. We can change the size by using the cornerSize property.

Syntax

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

Options Keys

  • cornerSize − This property accepts a Number which allows us to manipulate the size of the controlling corners of a selected object. Its default value is 13.

Example 1

Default size of the controlling corners

Let's see a code that depicts the default size of the controlling corners of a circle object when it is actively selected.

<!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 size of the controlling corners of a circle using FabricJS</h2>
      <p>Select the object and notice the size of its controlling corners. This is the default appearance. Here we haven't used the <b>cornerSize</b> property.</p>
      <canvas id="canvas"></canvas>

      <script>
         // Initiate a canvas instance
         var canvas = new fabric.Canvas("canvas");
         var cir = new fabric.Circle({
            left: 215,
            top: 100,
            fill: "white",
            radius: 50,
            stroke: "#c154c1",
            strokeWidth: 5,
            borderColor: "#daa520",
            cornerColor: "rgb(255,20,147)"
         });

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

Example 2

Passing cornerSize as key with a custom value

In this example, we are passing the cornerSize property as key with a value of 7. We can see how that changes the size of our controlling corners when the circle object is selected.

<!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 size of the controlling corners of a circle using FabricJS</h2>
      <p>Select the object and notice the size of its controlling corners. Here we have set the <b>cornerSize</b> at 7. </p>
      <canvas id="canvas"></canvas>

      <script>
         // Initiate a canvas instance
         var canvas = new fabric.Canvas("canvas");
         var cir = new fabric.Circle({
            left: 215,
            top: 100,
            fill: "white",
            radius: 50,
            stroke: "#c154c1",
            strokeWidth: 5,
            borderColor: "#daa520",
            cornerColor: "rgb(255,20,147)",
            cornerSize: 7
         });

         // Adding it to the canvas
         canvas.add(cir);
         canvas.setWidth(document.body.scrollWidth);
         canvas.setHeight(250);
      </script>
   </body>
</html>
raja
Updated on 27-May-2022 07:52:29

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