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Fabric.js Polyline evented Property

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  • Last Updated : 22 Jan, 2021

In this article, we are going to see how to use the evented property of the canvas Polyline in Fabric.js. The Polyline in Fabric.js 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. This property specifies whether to enable or disable the Polyline object to be a target of events.

To make this possible we are going to use a JavaScript library called Fabric.js. After importing the library, we will create a canvas block in the body tag which will contain the Polyline. After this, we will initialize instances of Canvas and Polyline provided by Fabric.js, disable the canvas movement property of the Polyline using evented property and render the Polyline on the Canvas as given below.

Syntax:

var polyline = new fabric.Polyline(Points, {  
   evented: boolean
});  

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

  • evented: It specifies whether to enable or disable the object to be a target of events.

The below example illustrates the Polyline evented property in Fabric.js:

Example:

HTML




<html>
<head>
    <!-- Adding 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 evented 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',
            excludeFromExport: false,
            evented: false
  
        });
        // Render the polyline in canvas 
        canvas.add(polyline); 
    </script>
</body>
</html>

Output:


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