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Fabric.js Group useSetOnGroup Property

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  • Last Updated : 29 Jan, 2021

In this article, we are going to see how to set the useSetOnGroup of a Group of the canvas using Fabric.js. The Group in Fabric.js is movable and can be stretched according to requirements. Further, the Group 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 Group. After this, we will initialize instances of Canvas and Group provided by Fabric.js and and set the useSetOnGoup of a canvas Group using the useSetOnGroup property.

Syntax:

fabric.Group([canvas1, canvas2], {
   useSetOnGroup: Boolean
});

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

  • useSetOnGroup: If it is set to true, then the coordinates of objects enclosed in a group do not change.

Below examples illustrate the use of Fabric.js Group useSetOnGroup property in JavaScript:

Example 1:

HTML




<!DOCTYPE html>
<html>
  
<head>
  <!-- FabricJS CDN -->
  <script src=
  </script>
  
</head>
  
<body>
    <div style="text-align: center;width: 400px;">
      <h1 style="color: green;">
          GeeksforGeeks
      </h1>
      <b>
          Fabric.js | Group useSetOnGroup Property
      </b>
    </div>
    
    <div style="text-align: center;">
      <canvas id="canvas" width="500" height="300"
      style="border:1px solid green;">
      </canvas>
    </div>
    
    <script>
      // Initiate a Canvas instance
      var canvas = new fabric.Canvas("canvas");
        
      // Initiate a circle instance
      var circle = new fabric.Circle({
        radius: 100,
        fill: 'lightgreen',
        scaleY: 0.6,
        originX: 'center',
        originY: 'center'
      });
  
      // Initiate a text instance
      var text = new fabric.Text('GeeksforGeeks', {
        fontSize: 25,
        originX: 'center',
        originY: 'center'
      });
  
      // Initiate a Group instance
      var group = new fabric.Group([ circle, text ], {
          useSetOnGroup: false
      });
  
      // Render the Group in canvas
      canvas.add(group);
  
      // Center the Group in canvas
      canvas.centerObject(group);
  </script>
</body>
  
</html>

Output:

Example 2:

HTML




<!DOCTYPE html>
<html>
  
<head>
  <!-- FabricJS CDN -->
  <script src=
  </script>
  
</head>
  
<body>
    <div style="text-align: center;width: 400px;">
      <h1 style="color: green;">
          GeeksforGeeks
      </h1>
      <b>
          Fabric.js | Group useSetOnGroup Property
      </b>
    </div>
    
    <div style="text-align: center;">
      <canvas id="canvas" width="500" height="300"
      style="border:1px solid green;">
      </canvas>
    </div>
    
    <script>
      // Initiate a Canvas instance
      var canvas = new fabric.Canvas("canvas");
        
      // Initiate a circle instance
      var circle = new fabric.Circle({
        radius: 100,
        fill: 'lightgreen',
        scaleY: 0.6,
        originX: 'center',
        originY: 'center'
      });
  
      // Initiate a text instance
      var text = new fabric.Text('GeeksforGeeks', {
        fontSize: 25,
        originX: 'center',
        originY: 'center'
      });
  
      // Initiate a Group instance
      var group = new fabric.Group([ circle, text ], {
        useSetOnGroup: true
      });
  
      // Render the Group in canvas
      canvas.add(group);
  
      // Center the Group in canvas
      canvas.centerObject(group);
  </script>
</body>
  
</html>

Output:


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