FabricJS - How to scale an image evenly horizontally and vertically?
In this tutorial, we will learn how to scale an image evenly both horizontally and vertically 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 the image evenly in both horizontal and vertical directions, we use the scale method.
grammar
scale(value: Number): fabric.Object
parameter
scale - This parameter accepts a Number, which is used to set the scale factor of the image object.
Default appearance of Image object
Example
Let's look at a code example to see what our image object looks like without using the scale method. In this case, our image object will not scale horizontally and 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>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="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 an Image object
var image = new fabric.Image(imageElement, {
top: 50,
left: 110,
});
// Add it to the canvas
canvas.add(image);
</script>
</body>
</html>
Use custom value to pass scale method
Example
In this example, we will now see that a value is being assigned to the scale method, which scales our image object equally horizontally and vertically. Since we've passed the value as 2, that's the scale factor to consider now.
<!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>Passing the scale method with a custom value</h2>
<p>
You can see that the object has been scaled in horizontal and vertical direction
</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 an Image object
var image = new fabric.Image(imageElement, {
top: 50,
left: 110,
});
// Using the scale method
image.scale(2);
// Add it to the canvas
canvas.add(image);
</script>
</body>
</html>
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