How to add animation in Text using FabricJS?

FabricJS Javascript HTML5 Canvas

In this tutorial, we are going to learn how to add animation in Text using FabricJS. We can display text on canvas by adding an instance of fabric.Text. Not only does it allow us to move, scale and change the dimensions of the text but it also provides additional functionality like text alignment, text decoration, line height which can be obtained by the properties textAlign, underline and lineHeight respectively. Similarly, we can also animate text by using the animate method.

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

Example 1

Default appearance of the Text object

Let’s see a code example to see how our text object looks when the animate method is not used. In this case, no animation is displayed.


<!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>Default appearance of the Text object</h2>
   <p>You can see that the text has no animation</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 text object
      var text = new fabric.Text("Sparse is better than dense!", {
         width: 300,
         left: 50,
         top: 70,
         fill: "green",
      });

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

Example 2

Using the animate method

In this example, we will see how by using the animate property we can easily create our own animation. The first argument is the property we want to animate. Here, for example, we have used the stroke property as an argument in order to change its colour. This property also allows us to use relative values just as we have specified the left value as +=100 which makes the text move.


<!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 animate method</h2>
   <p>You can see the animation now</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 text object
      var text = new fabric.Text("Sparse is better than dense!", {
         width: 700,
         left: 50,
         top: 70,
         fill: "#ccccff",
         stroke: "black",
         strokeWidth: 2,
         fontSize: 25
      });

      // Using the animate method
      text.animate('stroke', '87ceeb', {
         onChange: canvas.renderAll.bind(canvas)
      })
      
      text.animate('left', '+=100', { onChange: canvas.renderAll.bind(canvas) });

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

Rahul Gurung

Updated on: 13-Sep-2022

541 Views

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