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How to get the object scale factor of an Image using FabricJS?

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Sep 20, 2023 am 08:37 AM

How to get the object scale factor of an Image using FabricJS?

In this tutorial, we will learn how to get the object scale factor of an image using FabricJS. We can create an Image object by creating an instance of fabric.Image. Since it is one of the basic elements of FabricJS, we can also easily customize it by applying properties such as angle, opacity, etc. To get the object scaling factor of an Image, we use the getObjectScaling method.

grammar

getObjectScaling(): Object

Use getObjectscalingMethod

Example

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 id="Using-the-getObjectscaling-method">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>
   <img  src="/static/imghwm/default1.png"  data-src="https://www.tutorialspoint.com/images/logo.png?x-oss-process=image/resize,p_40"  class="lazy" id="img1"   style="max-width:90%" / alt="How to get the object scale factor of an Image using FabricJS?" >
   <script>
      // Initiate a canvas instance
      var canvas = new fabric.Canvas("canvas");
      canvas.setWidth(document.body.scrollWidth);
      canvas.setHeight(250);
      
      // Initiating the image element
      var imageElement = document.getElementById("img1");
      
      // Initiate an Image object
      var image = new fabric.Image(imageElement, {
         top: 50,
         left: 110,
      });
      
      // Add it to the canvas
      canvas.add(image);
      
      // Using getObjectScaling method
      console.log("The scale factor is", image.getObjectScaling());
   </script>
</body>
</html>

Use the getObjectScaling method and pass the scaleX property

Example

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 image 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 id="Using-the-getObjectScaling-method-and-passing-the-scaleX-property">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>
   <img  src="/static/imghwm/default1.png"  data-src="https://www.tutorialspoint.com/images/logo.png?x-oss-process=image/resize,p_40"  class="lazy" id="img1"   style="max-width:90%" / alt="How to get the object scale factor of an Image using FabricJS?" >
   <script>
      // Initiate a canvas instance
      var canvas = new fabric.Canvas("canvas");
      canvas.setWidth(document.body.scrollWidth);
      canvas.setHeight(250);
      
      // Initiating the image element
      var imageElement = document.getElementById("img1");
      
      // Initiate an Image object
      var image = new fabric.Image(imageElement, {
         top: 50,
         left: 110,
         scaleX: 2,
      });
      
      // Add it to the canvas
      canvas.add(image);
      
      // Using getObjectScaling method
      console.log("The scale factor is", image.getObjectScaling());
   </script>
</body>
</html>

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