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How to set the horizontal scale factor of a Rectangle using FabricJS?
In this tutorial, we are going to learn how to set the horizontal scale factor of a Rectangle using FabricJS. Rectangle is one of the various shapes provided by FabricJS. In order to create a rectangle, we will have to create an instance of fabric.Rect class and add it to the canvas.
Just as we can specify the position, colour, opacity and dimension of a rectangle object in the canvas, we can also set the horizontal scale of a rectangle object. This can be done by using the scaleX property.
Syntax
new fabric.Rect({ scaleX : Number }: Object)
Parameters
-
Options (optional) ? This parameter is an Object which provides additional customizations to our rectangle. Using this parameter, properties such as colour, cursor, stroke width, and a lot of other properties can be changed related to the object of which scaleX is a property.
Options Keys
-
scaleX ? This property accepts a Number value. The value that is assigned determines the horizontal object scale factor. Its default value is 1.
Example 1: Default Appearance without scaleX
Let's see a code example that displays the appearance of our rectangle object when the scaleX property is not used. By default, the horizontal scale factor of the rectangle object is 1. The scaleX property determines the transformation that resizes an object along the X-axis.
<!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 when scaleX is not used</h2>
<p>You can see that there is no scaling along the X-axis</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 rectangle object
var rect = new fabric.Rect({
left: 105,
top: 70,
width: 170,
height: 70,
fill: "#dcdcdc",
stroke: "#696969",
strokeWidth: 5,
});
// Add it to the canvas
canvas.add(rect);
</script>
</body>
</html>
Example 2: Using scaleX Property
In this example, we are passing the scaleX property as a key with a value of 2. This means that the rectangle object's scale factor in the horizontal direction is doubled, making it appear twice as wide.
<!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 scaleX property as key</h2>
<p>You can see that the object's horizontal width has been doubled</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 rectangle object
var rect = new fabric.Rect({
left: 105,
top: 70,
width: 170,
height: 70,
fill: "#dcdcdc",
stroke: "#696969",
strokeWidth: 5,
scaleX: 2,
});
// Add it to the canvas
canvas.add(rect);
</script>
</body>
</html>
Key Points
- The
scaleXproperty only affects horizontal scaling, not vertical - A value of 1 means no scaling (original size)
- Values greater than 1 enlarge the object horizontally
- Values between 0 and 1 shrink the object horizontally
- Negative values will flip the object horizontally
Conclusion
The scaleX property in FabricJS provides precise control over horizontal scaling of rectangle objects. Use values greater than 1 to enlarge and less than 1 to shrink rectangles along the X-axis.
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