How to get the object scale factor of Text using FabricJS?

FabricJS Javascript HTML5 Canvas

In this tutorial, we are going to learn how to get the object scale factor 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 scale factor by using the getObjectScaling method.

Syntax

getObjectScaling()

Example 1

Using the getObjectscaling method

Let’s see a code example to see the logged output when the getObjectScaling method is used. In this case, the default scaleX and scaleY values will be displayed in the console which are 1.


<!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 getObjectScaling method</h2>
   <p>You can open console from dev tools and see that the logged 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 getObjectScaling method
      console.log("The scale factor is", text.getObjectScaling());
   </script>
</body>
</html>

Example 2

Using the getObjectScaling method and passing the scaleX property

Let’s see a code example to see the logged output when the getObjectScaling method is used in conjunction with the scaleX property. In this case, the scaleX value of the text object will be displayed as 2 while the scaleY value will remain the same.


<!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 getObjectScaling method and passing the scaleX property</h2>
   <p>You can open console from dev tools and see that the logged 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",
         scaleX: 2,
      });

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

      // Using getObjectScaling method
      console.log("The scale factor is", text.getObjectScaling());
   </script>
</body>
</html>

Rahul Gurung

Updated on: 14-Sep-2022

122 Views

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