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Fabric.js Polyline borderDashArray Property
  • Last Updated : 26 Aug, 2020

In this article, we are going to see how to set the dash pattern of the border of the canvas polyline using FabricJS. The canvas polyline means the polyline is movable and can be stretched according to requirement. Further, the polyline 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 that will contain the polyline. After this, we will initialize instances of Canvas and Polyline provided by FabricJS and set the dash pattern of the border of the canvas polyline using borderDashArray property and render the Polyline on the Canvas as given in the below example.

Syntax:

var polyline = new fabric.Polyline(
    points,
    { 
        borderDashArray: Array
    }
)

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

  • points: It holds the starting and ending coordinates for all the points of the polyline.
  • borderDashArray: It is an array that defines the pattern of the dashes of the border.

Below example illustrate the Polyline borderDashArray Property in JavaScript:



Example:

Javascript

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<!DOCTYPE html>
<html>
  
<head>
    <title>
        Fabric.js | Polyline borderDashArray Property
    </title>
  
    <!-- 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 | Polyline borderDashArray 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: 300,
                y: 10
            }, {
                x: 350,
                y: 50
            }, {
                x: 350,
                y: 180
            }, {
                x: 250,
                y: 180
            }, {
                x: 250,
                y: 50
            }, {
                x: 300,
                y: 10
            }], {
  
            // Specify the border dash
            // pattern array 
            borderDashArray: [10]
        });
  
        // Render the Polyline in canvas 
        canvas.add(polyline); 
    </script>
</body>
  
</html>

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Output:

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