How to crop the left offset in a cloned image using FabricJS?


In this tutorial, we are going to show how you can crop the left offset in a cloned 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 like angle, opacity etc. In order to crop the left offset in a cloned image, we use the left property.

Syntax

cloneAsImage( callback: function, { left: Number}: Object): fabric.Object

Parameters

  • callback (optional) − This parameter is a function which is to be invoked with a cloned image instance as the first argument.

  • options (optional) − This parameter is an optional Object which provides additional customizations to our clone image. Using this parameter we can set a multiplier, crop the clone image, remove the current object transform or a lot of other properties can be changed of which left is a property.

Options Keys

  • left − This property accepts a Number value which denotes left offset that has to be cropped. This property is optional.

Without using the left property

Example

Let’s see a code example of how the cloned Image object appears when the left property is not used. In this case, the cloned image will not be cropped.

<!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>Without using the left property</h2> <p>You can see that no cropping has been applied to the clone image</p> <canvas id="canvas"></canvas> <img src="https://www.tutorialspoint.com/images/logo.png" id="img1" style="display: none" /> <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 a shadow object var shadow = new fabric.Shadow({ color: "#308080", blur: 3, }); // Initiate an Image object var image = new fabric.Image(imageElement, { top: 50, left: 110, skewX: 20, shadow: shadow, }); // Using cloneAsImage method image.cloneAsImage(function(Img) { Img.set("top", 150); canvas.add(Img); }); </script> </body> </html>

Using the left property

Example

In this example, we have used the left property and passed it a value 100 which is cropping left offset for the clone image. Therefore, the left portion will be cropped.

<!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 left property</h2> <p>You can see that cropping has been applied to the clone image</p> <canvas id="canvas"></canvas> <img src="https://www.tutorialspoint.com/images/logo.png" id="img1" style="display: none" /> <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 a shadow object var shadow = new fabric.Shadow({ color: "#308080", blur: 3, }); // Initiate an Image object var image = new fabric.Image(imageElement, { top: 50, left: 110, skewX: 20, shadow: shadow, }); // Using cloneAsImage method image.cloneAsImage( function(Img) { Img.set("top", 150); Img.set("left", 150); canvas.add(Img); }, { left: 100, } ); </script> </body> </html>

Conclusion

In this tutorial, we used two examples to demonstrate how you can crop the left offset in a cloned image using FabricJS.

Updated on: 26-Oct-2022

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