Fabric.js Polygon cornerDashArray Property

Last Updated : 18 Jan, 2021

In this article, we are going to see how to set the dash pattern of controlling corners of the canvas Polygon using FabricJS. The canvas Polygon means the 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 this 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 a dash pattern of controlling corners of the canvas Polygon using cornerDashArray 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 }],
        {
                cornerDashArray: array
        });

Parameters: This property accepts a single parameter as mentioned above and described below:

cornerDashArray: This parameter defines the dash pattern of the controlling corners.

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

Example: This example uses FabricJS to set a dashed pattern of controlling corners of the canvas-like rectangle as given below. You have to click on the Polygon object to see the dash pattern of controlling corners.

HTML

<!DOCTYPE html>  
<html>  
  
<head>  
    <!-- Loading the FabricJS library -->
    <script src=  
"https://cdnjs.cloudflare.com/ajax/libs/fabric.js/3.6.2/fabric.min.js">  
    </script>  
</head>  
  
<body>  
    <div style="text-align: center;width: 600px;">  
        <h1 style="color: green;">  
            GeeksforGeeks  
        </h1>  
        <b>  
            Fabric.js | Polygon cornerDashArray 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,  
                cornerDashArray: [5]    
        });  
  
        // Render the polygon in canvas  
        canvas.add(polygon);  
    </script>  
</body>  
  
</html>