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How to lock the horizontal skewing of Circle using FabricJS?
In this tutorial, we are going to learn how to lock the horizontal skewing of a Circle using FabricJS. Just as we can specify the position, colour, opacity and dimension of a circle object in the canvas, we can also specify whether we want to stop skewing an object horizontally. This can be done by using the lockSkewingX property.
Syntax
new fabric.Circle({ lockSkewingX : Boolean }: Object)
Parameters
options (optional) ? This parameter is an Object which provides additional customizations to our circle. 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 lockSkewingX is a property.
Options Keys
lockSkewingX ? This property accepts a Boolean value. If we assign it a 'true' value, then the object's horizontal skewing will be locked.
Example 1: Default Behavior
Default behaviour of a Circle object in the canvas
Let's see a code to understand the default behaviour of a Circle object when lockSkewingX property is not used. Skewing the object in both horizontal and vertical directions is feasible by pressing the shift key and then dragging along the horizontal or vertical direction.
<!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>Locking the horizontal skewing of circle using FabricJS</h2>
<p>Select the object, hold the <b>shift</b> key, and stretch the object horizontally or vertically. You will notice that the object gets skewed freely in either direction. This is the default behavior. Here we have not applied the <b>lockSkewingX</b> property, but by default, it is set to False. </p>
<canvas id="canvas"></canvas>
<script>
// Initiate a canvas instance
var canvas = new fabric.Canvas("canvas");
var circle = new fabric.Circle({
left: 115,
top: 50,
fill: "white",
radius: 50,
stroke: "black",
strokeWidth: 5
});
// Adding it to the canvas
canvas.add(circle);
canvas.setWidth(document.body.scrollWidth);
canvas.setHeight(250);
</script>
</body>
</html>
Example 2: Locking Horizontal Skewing
Passing lockSkewingX as key with 'true' value
In this example we will see how we can cease the ability of a circle object to skew horizontally using the lockSkewingX property. As we can see, although we can skew the circle object vertically by pressing the Shift key, we are not allowed to perform the same action horizontally.
<!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>Locking the horizontal skewing of a circle using FabricJS</h2>
<p>Select the object, hold the <b>shift</b> key, and try to stretch the object horizontally. You will notice that horizontal skewing is not allowed, as we have set <b>lockSkewingX</b> to True. You can however skew the object in the vertical direction.</p>
<canvas id="canvas"></canvas>
<script>
// Initiate a canvas instance
var canvas = new fabric.Canvas("canvas");
var circle = new fabric.Circle({
left: 115,
top: 50,
fill: "white",
radius: 50,
stroke: "black",
strokeWidth: 5,
lockSkewingX: true
});
// Adding it to the canvas
canvas.add(circle);
canvas.setWidth(document.body.scrollWidth);
canvas.setHeight(250);
</script>
</body>
</html>
Key Points
By default, lockSkewingX is set to
false, allowing horizontal skewingSetting lockSkewingX to
trueprevents horizontal skewing while preserving vertical skewingUsers can still perform other transformations like scaling, rotating, and moving the object
This property is useful when you want to maintain the object's horizontal proportions
Conclusion
The lockSkewingX property in FabricJS provides precise control over circle object transformations. By setting it to true, you can prevent horizontal skewing while maintaining other transformation capabilities, ensuring your design maintains its intended horizontal proportions.
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