How to get the scaled height of Text using FabricJS?

FabricJS Javascript HTML5 Canvas

In this tutorial, we are going to learn how to get the scaled height of 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. We can also find the object’s scaled height by using the getScaledHeight method.

Syntax

getScaledHeight()

Example 1

Using the getScaledHeight method

Let’s see a code example to see the logged output when the getScaledHeight method is used. In this case, the height of the object will be returned.


<!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 getScaledHeight method</h2>
   <p>You can open console from dev tools and see that the height value is being displayed in the console</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("Add sample
text here", {
         width: 300,
         fill: "green",
         fontWeight: "bold",
      });

      // Add it to the canvas
      canvas.add(text);

      // Using getScaledHeight method
      console.log("The scaled height is", text.getScaledHeight());
   </script>
</body>
</html>

Example 2

Using the getScaledHeight method and passing the scaleY property

Let’s see a code example to see the logged output when the getScaledHeight method is used in conjunction with the scaleY property. In this case, final scaled height will be displayed in the console.


<!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 getScaledHeight method and passing the scaleY property</h2>
   <p>You can open console from dev tools and see that the height value is being displayed in the console has increased </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("Add sample
text here", {
         width: 300,
         fill: "green",
         fontWeight: "bold",
         scaleY: 2,
      });
      
      // Add it to the canvas
      canvas.add(text);
      
      // Using getScaledHeight method
      console.log("The scaled height is", text.getScaledHeight());
   </script>
</body>
</html>

Rahul Gurung

Updated on: 14-Sep-2022

165 Views

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