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How to lock the horizontal skewing of Textbox using FabricJS?
In this tutorial, we are going to learn how to lock the horizontal skewing of a Textbox using FabricJS. Just as we can specify the position, colour, opacity and dimension of a textbox 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.Textbox(text: String, { lockSkewingX : Boolean }: Object)
Parameters
text ? This parameter accepts a String which is the text string that we want to display inside our textbox.
options (optional) ? This parameter is an Object which provides additional customizations to our textbox. 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 Without Locking
Let's see a code example to understand the default behaviour of a Textbox 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 Textbox object in the canvas</h2>
<p>You can press the shift-key and drag the edge 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 textbox object
var textbox = new fabric.Textbox("The eyes are useless when the mind is blind.", {
width: 400,
left: 110,
top: 70,
fill: "orange",
strokeWidth: 2,
stroke: "green",
textAlign: "center",
});
// Add it to the canvas
canvas.add(textbox);
</script>
</body>
</html>
Example 2: Locking Horizontal Skewing
In this example we will see how we can cease the ability of a Textbox object to skew horizontally using the lockSkewingX property. As we can see, although we can skew the textbox 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>You can try and see 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 textbox object with lockSkewingX enabled
var textbox = new fabric.Textbox("The eyes are useless when the mind is blind.", {
width: 300,
left: 110,
top: 70,
fill: "orange",
strokeWidth: 2,
stroke: "green",
textAlign: "center",
lockSkewingX: true,
});
// Add it to the canvas
canvas.add(textbox);
</script>
</body>
</html>
Key Points
- The lockSkewingX property only prevents horizontal skewing; vertical skewing remains available
- To skew an object, hold the Shift key and drag the object's edges
- This property is useful when you want to maintain consistent horizontal alignment while allowing vertical transformations
Conclusion
The lockSkewingX property in FabricJS provides precise control over textbox transformations by restricting horizontal skewing while maintaining other manipulation capabilities. This is particularly useful for maintaining design consistency in interactive canvas applications.
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