How to set the duration of animation on a Line using FabricJS?

In this tutorial, we are going to learn how to set the duration of animation on a 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 one-dimensional 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 change the duration of animated text we use the duration property.

Syntax

animate(property: String | Object, value: Number | Object)

Parameters

property − This property accepts a String or Object value which determines which properties we want to animate.
value − This property accepts a Number or Object value which determines the values to animate properties.

Options Keys

duration − This property accepts a Number. It can be used to change the duration of an animation. The default value is 500ms.

Using default value of duration property

Example

Let’s see a code example to see how our line object looks when the animate method is used in conjunction with the default value of duration property. In this case, the left animation will have a duration of 500ms


<!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 default value of duration property</h2>
   <p>You can see that the left animation happens for 500ms</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([200, 100, 100, 40], {
         stroke: "blue",
         strokeWidth: 20,
      });

      // Using the animate method
      line.animate("left", "+=100", {
         onChange: canvas.renderAll.bind(canvas),
         duration: 500,
      });
      line.animate("angle", "90", {
         onChange: canvas.renderAll.bind(canvas),
      });

      // Add it to the canvas
      canvas.add(line);
   </script>
</body>
</html>

Using a custom value for duration property

Example

In this example, we will see how by using the animate method along with the duration property, we can control the time for which an animation occurs. Here, we have specified the duration as 1000ms which means, our left animation will occur for 1 second.


<!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 a custom value for duration property</h2>
   <p>You can see that the left animation happens for 1000ms</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([200, 100, 100, 40], {
         stroke: "blue",
         strokeWidth: 20,
      });

      // Using the animate method
      line.animate("left", "+=100", {
         onChange: canvas.renderAll.bind(canvas),
         duration: 1000,
      });
      line.animate("angle", "90", {
         onChange: canvas.renderAll.bind(canvas),
      });

      // Add it to the canvas
      canvas.add(line);
   </script>
</body>
</html>