How to make the controlling corners of an Ellipse transparent using FabricJS?

FabricJSJavascriptHTML5 Canvas

In this tutorial, we are going to learn how to make the controlling corners of Ellipse transparent 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. The transparentCorners property allows us to make the controlling corners of Ellipse transparent.

Syntax

new fabric.Ellipse( { transparentCorners: Boolean }: 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 transparentCorners is a property.

Options Keys

  • transparentCorners − This property accepts a Boolean value which allows us to render the controlling corners of an object as transparent. Its default value is True.

Example 1

Passing transparentCorners property as key with a 'false' value

Let's see a code to create an ellipse object with controlling corners that are not transparent. To achieve this, we need to pass the transparentCorners property a "false" value.

<!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 make controlling corners of Ellipse transparent using FabricJS?</h2>
      <p>Select the object and you will notice that the controlling corners are not transparent. Here we have set the <b>transparentCorners</b> property to False. </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: 115,
            top: 50,
            rx: 100,
            ry: 70,
            fill: "red",
            transparentCorners: false,
         });

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

Example 2

Passing transparentCorners as key with a 'true' value

In this example, we are passing the transparentCorners property a "true" value. This will make sure that the controlling corners are rendered as transparent. Note, that this is also the default behaviour.

<!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>Making the controlling corners of an Ellipse transparent using FabricJS</h2>
      <p>Select the object and you will notice that its controlling coners are now transparent as we have applied the <b>transparentCorners</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: 115,
            top: 50,
            rx: 100,
            ry: 70,
            fill: "red",
            transparentCorners: true,
         });
     
         // Adding it to the canvas
         canvas.add(ellipse);
         canvas.setWidth(document.body.scrollWidth);
         canvas.setHeight(250);
      </script>
   </body>
</html>
raja
Updated on 24-May-2022 14:11:01

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