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Fabric.js ActiveSelection isCacheDirty() Method

  • Last Updated : 25 May, 2021

In this article, we are going to see how use the isCacheDirty() Method in the canvas ActiveSelection using FabricJS, it used to fill an object. The canvas ActiveSelection means the ActiveSelection is movable and can be stretched according to requirements. Further, the ActiveSelection can be customized when it comes to initial stroke color, height, width, fill color, or stroke width.

The isCacheDirty() Method returns true if the cache is dirty.

Approach: First import the fabric.js library. After importing the library, create a canvas block in the body tag which will contain the ActiveSelection. After this, initialize an instance of Canvas and ActiveSelection class provided by Fabric.JS and use the isCacheDirty() method.

Syntax:

ActiveSelection.isCacheDirty()

Parameters: This function does not takes any parameter.

Return Value: This method returns the object value that returns true if cache is dirty.

Example: This example uses FabricJS to set the isCacheDirty() method of the canvas ActiveSelection as shown in the below example:

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 | ActiveSelection 
          isCacheDirty() method
      </b>
    </div>
  
    <div style="text-align: center;">
      <canvas id="canvas" width="500" 
        height="500" style="border:1px solid green;">
      </canvas>
    </div>
  
    <img src=
         width="100" height="100"
         id="my-image" style="display: none;">
    
    <script>
      var canvas = new fabric.Canvas("canvas");
  
      // Getting the image 
      var img = document.getElementById('my-image');
  
      // Creating the image instance 
      var geek = new fabric.Image(img, {
      });
  
      canvas.add(geek);
  
      var geek = new fabric.IText('GeeksforGeeks', {
      });
      canvas.add(geek);
      canvas.centerObject(geek);
  
      var gfg = new fabric.ActiveSelection(canvas.getObjects(), {
      });
      canvas.setActiveObject(gfg);
      canvas.requestRenderAll();
      canvas.centerObject(gfg);
      console.log(gfg.isCacheDirty())
    </script>
</body>
  
</html>

Output:


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