How to set the style of controlling corners of Ellipse using FabricJS?

FabricJSJavascriptHTML5 Canvas

In this tutorial, we are going to learn how to set the style of controlling corners of Ellipse 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 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 color to it, changing its size etc. We can change the style by using the cornerStyle property.

Syntax

new fabric.Ellipse({ cornerStyle: String }: 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 cornerStyle is a property.

Options Keys

  • cornerStyle − This property accepts a String that allows us to specify the style of controlling corners that we want.

Example 1

Default style of controlling corners

The following example shows the default style of controlling corners.

<!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 style of controlling corners of an Ellipse using FabricJS</h2>
      <p>Select the object and observe its controlling corners. This is the default appearance as we have not used the <b>cornerStyle</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: 215,
            top: 100,
            fill: "white",
            rx: 90,
            ry: 50,
            stroke: "#c154c1",
            strokeWidth: 5,
            borderColor: "#daa520",
            cornerColor: "rgb(255,20,147)",
         });

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

Example 2

Passing cornerStyle as key with the value "circle"

We can specify the style or appearance of the controlling corners of an actively selected object by passing the values as "circle" or "rect". Passing the value as "circle" will make the controlling corners appear circular, as we have done in the example below −

<!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 style of controlling corners of Ellipse using FabricJS</h2>
      <p>Select the object and observe the shape of its controlling corners. We have set the <b>cornerStyle</b> as circle.</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: 215,
            top: 100,
            fill: "white",
            rx: 90,
            ry: 50,
            stroke: "#c154c1",
            strokeWidth: 5,
            borderColor: "#daa520",
            cornerColor: "rgb(255,20,147)",
            cornerStyle: "circle",
         });

         // Adding it to the canvas
         canvas.add(ellipse);
         canvas.setWidth(document.body.scrollWidth);
         canvas.setHeight(250);
      </script>
   </body>
</html>
raja
Updated on 25-May-2022 11:04:05

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