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How to lock the horizontal skewing of Rectangle using FabricJS?
In this tutorial, we are going to learn how to lock the horizontal skewing of a Rectangle using FabricJS. Just as we can specify the position, colour, opacity and dimension of a rectangle 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.Rect({ lockSkewingX : Boolean }: 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 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.
How Skewing Works in FabricJS
By default, FabricJS allows users to skew objects both horizontally and vertically by holding the Shift key and dragging the control points. The lockSkewingX property specifically restricts horizontal skewing while preserving vertical skewing capabilities.
Example 1: Default Behavior
Default behaviour of a Rectangle object in the canvas
Let's see a code example to understand the default behaviour of a Rectangle 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>Default behaviour of a Rectangle object in the canvas</h2>
<p>Press the shift-key and drag the object along the X or Y-axis to see that
skewing is possible in both directions.</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: 155,
top: 90,
width: 170,
height: 70,
fill: "#6f2da8",
padding: 9,
stroke: "#b666d2",
strokeWidth: 5,
});
// Add it to the canvas
canvas.add(rect);
</script>
</body>
</html>
Example 2: Locking Horizontal Skewing
Passing lockSkewingX as key with a True value
In this example, we will see how we can cease the ability of a Rectangle object to skew horizontally using the lockSkewingX property. As we can see, although we can skew the rectangle object vertically, 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>Passing lockSkewingX as key with True value</h2>
<p>Press the shift-key and try to drag the object in the horizontal direction. You will notice that skewing along the X-axis is no longer feasible.</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: 155,
top: 90,
width: 170,
height: 70,
fill: "#6f2da8",
padding: 9,
stroke: "#b666d2",
strokeWidth: 5,
lockSkewingX: true,
});
// Add it to the canvas
canvas.add(rect);
</script>
</body>
</html>
Key Points
Setting
lockSkewingX: trueprevents horizontal skewing while maintaining vertical skewing capabilityUsers must hold the Shift key and drag control points to skew objects in FabricJS
The property only affects horizontal skewing - vertical skewing remains unchanged
This property is useful when you want to maintain the vertical proportions of an object
Conclusion
The lockSkewingX property in FabricJS provides precise control over object transformations by restricting horizontal skewing. This feature is particularly useful when you need to preserve specific design constraints while allowing limited user interactions.
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