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How to lock the flipping during scaling of Circle using FabricJS?
In this tutorial, we are going to learn how to lock the flipping during scaling 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 stop flipping of an object during scaling. This can be done by using the lockScalingFlip property.
Syntax
new fabric.Circle({ lockScalingFlip : 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 lockScalingFlip is a property.
Options Keys
-
lockScalingFlip ? This property accepts a Boolean value. If we assign it a 'true' value, then the object will not be allowed to flip during scaling.
Example 1: Default Behavior
Default behaviour of a Circle object in the canvas
Let's see an example to understand the default behaviour of a Circle object when lockScalingFlip property is not used. By default, objects can flip during scaling operations.
<!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 Circle Scaling Behavior</h2>
<p>Select the circle and try to scale it up or down. You will notice that the circle flips while scaling. This is the default behavior. Here we haven't used the <b>lockScalingFlip</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 Scale Flip
Passing lockScalingFlip as key with 'true' value
In this example, we will see how we can cease the ability of a circle object to flip while scaling by using the lockScalingFlip property. As we can see, although we try to flip the circle object, it is no longer allowed.
<!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>Circle with Locked Scaling Flip</h2>
<p>Select the object and try to scale it up or down. Observe that the circle will no longer flip during scaling, as we have set <b>lockScalingFlip</b> to True.</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,
lockScalingFlip: true
});
// Adding it to the canvas
canvas.add(circle);
canvas.setWidth(document.body.scrollWidth);
canvas.setHeight(250);
</script>
</body>
</html>
Key Points
- The lockScalingFlip property is set to
falseby default, allowing objects to flip during scaling - Setting lockScalingFlip to
trueprevents the object from flipping when scaled beyond its original boundaries - This property is useful for maintaining object orientation during user interactions
Conclusion
The lockScalingFlip property in FabricJS provides control over object behavior during scaling operations. By setting it to true, you can prevent circles from flipping and maintain their orientation regardless of scaling direction.
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