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How to cancel running animation in Line using FabricJS?

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2023-09-07 17:05:02896browse

如何使用 FabricJS 取消 Line 中的运行动画？

In this tutorial, we will learn how to cancel a running animation in a Line using FabricJS. Line element is one of the basic elements provided in FabricJS. It is used to create straight lines. Since line elements are geometrically one-dimensional and contain no interiors, 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. To cancel a running animation, we use the dispose method.

Syntax

 dispose()

Not using dispose Method

Example

Let’s look at a code example to understand when dispose method. Here we create a simple animation where a 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>

Use disposemethod

Example

In this example, we use the dispose method to cancel the running animation. all The running animation of the line instance will therefore 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>

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