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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 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.
<!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>How to lock the flipping during scaling of circle using FabricJS</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
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>How to lock the flipping during scaling of circle using FabricJS</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>
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