Fabric.js Polyline stroke Property

Last Updated : 26 Aug, 2020

In this article, we are going to see how to set the stroke color of a 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 stroke color of the polyline using stroke property and render the Polyline on the Canvas as given in the example below.

Syntax:

var polyline = new fabric.Polyline(
    Points, 
    { 
        stroke : string
    }
)

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.
stroke: It is a string that specifies the color of the stroke.

Below example illustrate the Polyline stroke Property in JavaScript:

Example:

JavaScript

<!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 stroke 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
            }], {

            // Set the color of
            // the stroke
            stroke: 'green',

            // Set the width of
            // the stroke
            strokeWidth: 4
        });

        // Render the Polyline in canvas 
        canvas.add(polyline); 
    </script>
</body>

</html>

Output:

Fabric.js Polyline strokeWidth Property

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Fabric.js Polyline stroke Property

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