Fabric.js Polygon strokeDashArray Property

Last Updated : 20 Jan, 2021

In this article, we are going to see how to add a stroke dash pattern to the Polygon canvas using FabricJS. The canvas means Polygon written is movable, rotatable, resizable, and can be stretched. But in this article, we will add a stroke dash pattern. Further, the Polygon itself cannot be edited like a textbox.

To make it possible, we are going to use a JavaScript library called FabricJS. After importing the library using CDN, we will create a canvas block in the body tag which will contain our Polygon. After this, we will initialize instances of Canvas and Polygon provided by FabricJS and create a stroke using stroke property and further use the strokeDashArray property to add stroke dash pattern and render the Canvas on the Polygon 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 }],
    {
        strokeDashArray : Array
    }
);

Parameters: This property accepts a single value as an array mentioned above and described below:

Array: It specifies the stroke dash pattern.

Below example illustrate the Fabric.js strokeDashArray:

Example:

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 strokeDashArray 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', 
            strokeDashArray: [10] 
        }); 
  
        // Render the polygon in canvas  
        canvas.add(polygon); 
    </script> 
</body> 
  
</html> 