In this tutorial, we will learn how to scale an Image object to a given width 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 scale an Image object to a given width, we use the scaleToWidth method.
grammar
scaleToWidth(value: Number, absolute: Boolean): fabric.Object
parameter
-
value - This parameter accepts a Number, which determines the new width value of the Image object.
absolute - This parameter accepts a boolean value that determines whether the viewport is ignored.
Default appearance of Image object
Example
Let's look at a code example to see what an image object looks like without using the scaleToWidth method. In this case, our image object will not scale horizontally or vertically.
<!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="Default-appearance-of-the-Image-object">Default appearance of the Image object</h2>
<p>
You can see that the object has not been scaled in horizontal or vertical direction
</p>
<canvas id="canvas"></canvas>
<img src="/static/imghwm/default1.png" data-src="https://www.tutorialspoint.com/images/logo.png" class="lazy" id="img1" style="max-width:90%" / alt="FabricJS - How to scale an image object to a given width?" >
<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);
</script>
</body>
</html>
Pass using custom value scaleToWidth Method
Example
In this example we will see how to scale an image object to a given width by assigning a value to the scaleToWidth method. Since we have passed the value as 200, this will be the new width of the image object.
<!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="Passing-the-scaleToWidth-method-with-a-custom-value">Passing the scaleToWidth method with a custom value</h2>
<p>You can see that the new width of our image object is 200</p>
<canvas id="canvas"></canvas>
<img src="/static/imghwm/default1.png" data-src="https://www.tutorialspoint.com/images/logo.png" class="lazy" id="img1" style="max-width:90%" / alt="FabricJS - How to scale an image object to a given width?" >
<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,
});
// Using the scaleToWidth method
image.scaleToWidth(200, false);
// Add it to the canvas
canvas.add(image);
</script>
</body>
</html>
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