How to create an Ellipse with a border color using FabricJS?

FabricJSJavascriptHTML5 Canvas

In this tutorial, we are going to create an Ellipse with a border color 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. Since FabricJS is extremely flexible, we are allowed to customize our ellipse object in any way we like. One of the properties that FabricJS provides is borderColor which allows us to manipulate the color of the border when our object is active.

Syntax

new fabric.Ellipse({ borderColor: 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 borderColor is a property.

Options Keys

  • borderColor − This property accepts a String which determines the color of the border when our object is actively selected. Its default value is rgb(178,204,255).

Example 1

Passing borderColor key with a String value

Let's see an example of how we can assign a value to the borderColor property. We have assigned the value "blue" to the borderColor key which helps to create the blue border on selection of our ellipse object.

<!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 create an Ellipse with a border color using FabricJS?</h2>
      <p>Select the object to see the "blue" border color.</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,
            rx: 90,
            ry: 50,
            fill: "red",
            borderColor: "blue",
         });

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

Example 2

Passing a rgba value to the borderColor key

Instead of passing simple color names as a String, we can also use RGBA values, whose components specify the amount of Red, Green, Blue and Alpha, where alpha denotes the opacity. In this example, we have used rgb(128,0,128) which is the rgb value for the color purple.

<!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 create an Ellipse with a border color using FabricJS?</h2>
      <p>Select the object to see the "purple" border color.</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,
            rx: 90,
            ry: 50,
            fill: "red",
            borderColor: "rgb(128,0,128)",
         });

         // 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 08:59:06

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