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

FabricJSJavascriptHTML5 Canvas

In this tutorial, we are going to set the colour of controlling corners of Circle using FabricJS. The cornerColor property allows us to manipulate the colour of the controlling corners when the object is active.

Syntax

new fabric.Circle({ cornerColor: String }: 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 the cornerColor is a property.

Options Keys

  • cornerColor − This property accepts a String which allows us to assign a color to the controlling corners when the object is actively selected.

Example 1

Passing cornerColor as key with a color name as value

Let's see an example to change the colour by using the cornerColor property. In this case, we have assigned the value "black" to the key which makes the controlling corners appear black.

<!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 colour of controlling corners of circle using FabricJS</h2>
      <p>Select the object and notice the color of its controlling corners. Here we have used the <b>cornerColor</b> property to set the corners black. </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: "black"
         });
         
         // Adding it to the canvas
         canvas.add(cir);
         canvas.setWidth(document.body.scrollWidth);
         canvas.setHeight(250);
      </script>
   </body>
</html>

Example 2

Assigning an RGBA value to the cornerColor property

Instead of passing a simple colour name as the String value to the key, we can also assign an RGBA value. RGBA stands for red, green, blue and alpha where alpha is the opacity. Let us see an example of how we can do that −

<!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 colour of controlling corners of circle using FabricJS</h2>
      <p>Select the object and notice the color of its controlling corners. Here we have used the <b>cornerColor</b> and assigned it an "rgba" value to set the corners purple. </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>
raja
Updated on 25-May-2022 13:35:25

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