Fabric.js Polygon includeDefaultValues Property

Last Updated : 20 Jan, 2021

In this article, we are going to see the includeDefaultValues the property of a polygon canvas using FabricJS. The canvas polygon means the polygon is movable and can be stretched according to requirement. 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 includeDefaultValues of canvas polygon using includeDefaultValues 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 }
],
{
    includeDefaultValues: boolean
});

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

includeDefaultValues: It specifies default object’s values are included in or not its serialization, When `false` values are not included in its serialization

Note: Dimension pixels is must create a polygon.

Below examples illustrate the Fabric.JS Polygon includeDefaultValuesproperty in JavaScript:

Example:

HTML

<!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 | Polygon includeDefaultValues 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 }], {  
            includeDefaultValues: 'false' 
        });  
  
        // Render the polygon in canvas  
        canvas.add(polygon);  
    </script>  
</body>  
  
</html>  