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Fabric.js Polygon selectionBackgroundColor Property
  • Last Updated : 23 Aug, 2020

In this article, we are going to see how to change the active background color of the canvas polygon 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 use the selectionBackgroundColor property to change the active background color and render the Canvas on the polygon as given in the example below.

Syntax:

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

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

  • selectionBackgroundColor: It specifies the color of the background when active.

Note: Dimension pixels is must create a polygon.



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

Example 1:

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 selectionBackgroundColor 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 }], { 
            fill: 'yellow',
            selectionBackgroundColor: '#e1e1e1'
        }); 
  
        // Render the polygon in canvas 
        canvas.add(polygon); 
    </script
</body
  
</html>

Output:

Example 2:

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 selectionBackgroundColor 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 }], { 
            fill: 'yellow',
            selectionBackgroundColor: 'green'
        }); 
  
        // Render the polygon in canvas 
        canvas.add(polygon); 
    </script
</body
  
</html>

Output:

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