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How to lock the vertical skewing of Rectangle using FabricJS?
In this tutorial, we are going to learn how to lock the vertical 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 vertically. This can be done by using the lockSkewingY property.
Syntax
new fabric.Rect({ lockSkewingY : 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 lockSkewingY is a property.
Options keys
-
lockSkewingY ? This property accepts a Boolean value. If we assign it a "true" value, then the object's vertical skewing will be locked.
Example 1: Default Rectangle 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 lockSkewingY 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-axis 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 Vertical Skewing
Passing lockSkewingY as key with 'true' value
In this example, we will see how we can cease the ability of a rectangle object to skew vertically using the lockSkewingY property. As we can see, although we can skew the rectangle object horizontally, we are not allowed to perform the same action 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>Passing lockSkewingY as key with a "True" value</h2>
<p>You can see that skewing along the Y-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,
lockSkewingY: true,
});
// Add it to the canvas
canvas.add(rect);
</script>
</body>
</html>
How It Works
When lockSkewingY is set to true, FabricJS prevents the rectangle from being skewed vertically. Users can still perform horizontal skewing by holding the shift key and dragging horizontally, but vertical skewing operations will be disabled. This is useful when you want to maintain the vertical proportions of your rectangle while still allowing horizontal transformations.
Conclusion
The lockSkewingY property provides precise control over rectangle transformations in FabricJS. By setting it to true, you can prevent vertical skewing while maintaining other transformation capabilities.
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