Fabric.js Polyline strokeDashOffset Property

Last Updated : 22 Jan, 2021

In this article, we are going to see how to add stroke offset to the Polyline canvas using FabricJS. The canvas means Polyline written is movable, rotatable, resizable, and can be stretched. But in this article, we will add a stroke offset. Further, the Polyline 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 that will contain our Polyline. After this, we will initialize instances of Canvas and Polyline provided by FabricJS and create a stroke using stroke property, and further use the strokeDashOffset property to add stroke offset and render the Canvas on the Polyline as given in the below example.

Syntax:

var polyline = new fabric.Polyline(Points, {  
    strokeDashOffset: number
  });

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

strokeDashOffset: This parameter defines the amount of offset of stroke.

The below example illustrates the strokeDashOffset property in Fabric.js:

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 | Polyline strokeDashOffset 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 polyline instance  
     var polyline = new fabric.Polyline([  
        { x: 200, y: 10 },{x: 250,y: 50},  
        { x: 250, y: 180},{x: 150,y: 180},  
        { x: 150, y: 50 },{ x: 200,y: 10 }],  
      {  
        stroke: 'green',   
        strokeWidth: 3,   
        cornerStyle: 'circle',   
        strokeDashOffset: 10,    
      });  
  
      // Render the polyline in canvas  
      canvas.add(polyline);  
    </script>  
  </body>  
</html>