How to cancel running animations in Line using FabricJS?

In this tutorial, we are going to learn about how to cancel running animations in Line using FabricJS. A Line element is one of the basic elements provided in FabricJS. It is used for creating straight lines. Because line elements are geometrically onedimensional and do not contain an interior, they are never filled. We can create a line object by creating an instance of fabric.Line, specifying the x and y coordinates of the line and adding it to the canvas. In order to cancel running animations, we use the dispose method.

Syntax

 dispose()

Without using dispose method

Example

Let’s see a code example to see how animation works for a Line object when the dispose method is not used. Here we have created a simple animation where the line object completes a full rotation and expands in width.

<!DOCTYPE html>
<html>
<head>
   <!-- Adding the Fabric JS Library-->
   <script src="https://cdnjs.cloudflare.com/ajax/libs/fabric.js/510/fabric.min.js"></script>
</head>
<body>
   <h2>Without using dispose method</h2>
   <p>You can see the animation is happening properly</p>
   <canvas id="canvas"></canvas>
   <script>
      
      // Initiate a canvas instance
      var canvas = new fabric.Canvas("canvas");
      canvas.setWidth(document.body.scrollWidth);
      canvas.setHeight(250);
      
      // Initiate a Line object
      var line = new fabric.Line([250, 100, 310, 100], {
         stroke: "blue",
         strokeWidth: 10,
      });
      
      // Using the animate method
      line.animate("angle", "+=360", {
         onChange: canvas.renderAll.bind(canvas),
         duration: 1700,
      });
      
      // Add it to the canvas
      canvas.add(line);
   </script>
</body>
</html>

Using the dispose method

Example

In this example, we have used the dispose method to cancel the running animation. All the running animations of the line instance will thus be cancelled.

<!DOCTYPE html>
<html>
<head>
   <!-- Adding the Fabric JS Library-->
   <script src="https://cdnjs.cloudflare.com/ajax/libs/fabric.js/510/fabric.min.js"></script>
</head>
<body>
   <h2>Using the dispose method</h2>
   <p>You can see that the animation no longer happens</p>
   <canvas id="canvas"></canvas>
   <script>
      
      // Initiate a canvas instance
      var canvas = new fabric.Canvas("canvas");
      canvas.setWidth(document.body.scrollWidth);
      canvas.setHeight(250);
      
      // Initiate a Line object
      var line = new fabric.Line([250, 100, 310, 100], {
         stroke: "blue",
         strokeWidth: 10,
      });
      
      // Using the animate method
      line.animate("angle", "+=360", {
         onChange: canvas.renderAll.bind(canvas),
         duration: 1700,
      });
      
      // Add it to the canvas
      canvas.add(line);
      
      // Using dispose method
      line.dispose()
   </script>
</body>
</html>

Updated on: 20-Oct-2022

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