How to get Text's object scale factor using FabricJS?-JS Tutorial-php.cn

How to get Text's object scale factor using FabricJS?

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Release： 2023-08-27 23:13:08

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How to get Texts object scale factor using FabricJS?

In this tutorial, we will learn how to get the object scale factor of text using FabricJS. We can display text on the canvas by adding an instance of Fabric.Text. Not only does it allow us to move, scale and change the dimensions of text, but it also provides additional features such as text alignment, text decoration, line height, which are available through the properties textAlign, underline and lineHeight respectively. We can also find the object scaling factor using the getObjectScaling method.

grammar

getObjectScaling()

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Example 1

Use getObjectscaling method

Let's look at a code example to see the output logged when using the getObjectScaling method. In this case, the default scaleX and scaleY values of 1 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 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 sampletext 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>

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Example 2

Use getObjectScaling method and pass scaleX property

Let's look at a code example to see the output logged when the getObjectScaling method is used in conjunction with the scaleX property. In this case, the text object's scaleX value will appear to be 2, while the scaleY value will remain unchanged.

<!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 sampletext 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>

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