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Fabric.js Polygon cornerSize Property

  • Last Updated : 17 Jan, 2021

In this article, we are going to see how to set the size of controlling corners of the canvas Polygon using FabricJS. The canvas Polygon means Polygon is movable and can be stretched according to requirement. Further, the Polygon can be customized when it comes to initial stroke color, height, width, fill color, or stroke width

To make it possible, we are going to use a JavaScript library called FabricJS. After importing the library, we will create a canvas block in the body tag which will contain the Polygon. After this, we will initialize instances of Canvas and Polygon provided by FabricJS and set the size of controlling corners of the canvas Polygon using cornerSize property, and render the Polygon on the Canvas as given in the below example.

Syntax:

fabric.Polygon([
    { x: pixel, y: pixel },
    { x: pixel, y: pixel },
    { x: pixel, y: pixel},
    { x: pixel, y: pixel},
    { x: pixel, y: pixel }],
    { cornerSize : number}
);

Parameters: This function accepts three parameters as mentioned above and described below:

  • cornerSize: It specifies the size of the controlling corners.

Below examples illustrate the Fabric.JS Polygon cornerSize property in JavaScript:



Example:

HTML




<!DOCTYPE html> 
<html
  
<head
    <!-- Loading the FabricJS library -->
    <script src
    </script
</head
  
<body
    <div style="text-align: center;width: 600px;"
        <h1 style="color: green;"
            GeeksforGeeks 
        </h1
        <b
            Fabric.js | Polygon cornerSize Property 
        </b
    </div
  
    <canvas id="canvas"
            width="600"
            height="200"
            style="border:1px solid #000000;"
    </canvas
  
    <script
  
        // Initiate a Canvas instance 
        var canvas = new fabric.Canvas("canvas"); 
  
        // Initiate a polygon instance 
        var polygon = new fabric.Polygon([ 
            { x: 295, y: 10 }, 
            { x: 235, y: 198 }, 
            { x: 385, y: 78}, 
            { x: 205, y: 78}, 
            { x: 355, y: 198 }], { 
                stroke: 'green', 
                strokeWidth: 3, 
                cornerColor: 'blue', 
                cornerSize: 10 
            }
        ); 
  
        // Render the polygon in canvas 
        canvas.add(polygon); 
    </script
</body
  
</html>

Output:




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