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Fabric.js Polygon fillRule Property

Last Updated : 18 Jan, 2021
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In this article, we are going to see how to set the fill Rule of the canvas polygon using FabricJS, it used to fill an object. The canvas polygon means the polygon is movable and can be stretched according to requirements. Further, the polygon 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 polygon. After this, we will initialize instances of Canvas and polygon provided by FabricJS and set the fill rule of the canvas polygon using fillRule property, and render the polygon on the Canvas as given in the below example.

Syntax:

fabric.Polygon([  
    { x: pixel, y: pixel },  
    { x: pixel, y: pixel },  
    { x: pixel, y: pixel },  
    { x: pixel, y: pixel },  
    { x: pixel, y: pixel }],
    {
        fillRule : string
    });

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

  • fillRule: It specifies the rule to fill an object, accepted values are nonzero, evenodd.

Note: Dimension pixels are must to create a polygon.

Below examples illustrate the Fabric.JS Polygon fillRule property in JavaScript:

Example 1: In this example, we have set the property value to evenodd.

HTML




<!DOCTYPE html> 
<html
  
<head
    <!-- 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 | Polygon 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 polygon instance 
        var polygon = new fabric.Polygon([ 
        { x: 295, y: 10 }, 
        { x: 235, y: 198 }, 
        { x: 385, y: 78}, 
        { x: 205, y: 78}, 
        { x: 355, y: 198 }], { 
            fillRule: 'evenodd' 
        }); 
  
        // Render the polygon in canvas 
        canvas.add(polygon); 
    </script
</body
  
</html>


Output:

Example 2: In this example, we have set the property value to nonzero.

HTML




<!DOCTYPE html> 
<html
  
<head
    <!-- 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 | Polygon 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 polygon instance 
        var polygon = new fabric.Polygon([ 
        { x: 295, y: 10 }, 
        { x: 235, y: 198 }, 
        { x: 385, y: 78}, 
        { x: 205, y: 78}, 
        { x: 355, y: 198 }], { 
            fillRule: 'nonzero' 
        }); 
  
        // Render the polygon in canvas 
        canvas.add(polygon); 
    </script
</body
  
</html>


Output:



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