Fabric.js Polyline fillRule Property

Last Updated : 22 Jan, 2021

In this article, we are going to see how to use the fillRule property of the canvas Polyline in Fabric.js. This property is used to set the rule by which an object would be filled using the fill property. 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.

To make it 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 that will contain the Polyline. After this, we will initialize instances of Canvas and Polyline provided by Fabric.js, set the fill rule and color of the Polyline using the fillRule and fill property, and render the Polyline on the Canvas as given in the below example.

Syntax:

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

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

fillRule: It specifies the rule by which the object will be filled. The accepted values are ‘nonzero’ and ‘evenodd’.

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

Example:

HTML

<html> 
<head> 
    <!-- Adding the FabricJS library -->
    <script src= 
"https://cdnjs.cloudflare.com/ajax/libs/fabric.js/4.3.0/fabric.min.js"> 
    </script> 
</head> 
<body> 
    <div style="text-align: center;width: 600px;"> 
        <h1 style="color: green;"> 
            GeeksforGeeks 
        </h1> 
        <b> 
            Fabric.js | Polyline fillRule 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, 
            fill: 'red', 
            fillRule: 'evenodd' 
        }); 
          
        // Render the polyline in canvas  
        canvas.add(polyline);  
    </script> 
</body> 
</html>