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How to disable the centered rotation of a Circle using FabricJS?
In this tutorial, we are going to learn how to disable the centered rotation of Circle using FabricJS. Circle is one of the various shapes provided by FabricJS. In order to create a circle, we will create an instance of fabric.Circle class and add it to the canvas. By default, all objects in FabricJS use their center as the point of rotation. However, we can change this behaviour by using the centeredRotation property.
Syntax
new fabric.Circle({ centeredRotation: 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 centeredRotation is a property.
Options Keys
centeredRotation − This property accepts a Boolean value that allows us to control whether an object uses its origin of transformation as center point when rotated via controls. Its default value is True.
Example 1
Default behaviour of rotation of Circle in FabricJS
Let's see an example that depicts the default behaviour of a circle object. Since centeredRotation property is set to True by default, the circle object uses its center as the point of rotation.
<!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>Disabling the centered rotation of circle using FabricJs</h2>
<p>Select the object and rotate it by holding its controlling corner at the top. The circle will rotate around its center. It is the default behavior. Here we have not used the <b>centeredRotation</b> property but it is by default set to True. </p>
<canvas id="canvas"></canvas>
<script>
// Initiate a canvas instance
var canvas = new fabric.Canvas("canvas");
var cir = new fabric.Circle({
left: 215,
top: 100,
fill: "white",
radius: 50,
stroke: "#c154c1",
strokeWidth: 5,
borderColor: "#daa520",
});
// Adding it to the canvas
canvas.add(cir);
canvas.setWidth(document.body.scrollWidth);
canvas.setHeight(250);
</script>
</body>
</html>Example 2
Passing centeredRotation key with the value as "false"
Now that we've seen the default behaviour, let us see a code to understand what happens when the centeredRotation property is assigned False.
<!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>Disabling the centered rotation of circle using FabricJs</h2>
<p>Select the object and rotate it by holding its controlling corner at the top. Now the circle will not rotate around its cente because we have used the <b>centeredRotation</b> property and set it False. </p>
<canvas id="canvas"></canvas>
<script>
// Initiate a canvas instance
var canvas = new fabric.Canvas("canvas");
var cir = new fabric.Circle({
left: 215,
top: 100,
fill: "white",
radius: 50,
stroke: "#c154c1",
strokeWidth: 5,
borderColor: "#daa520",
centeredRotation: false
});
// Adding it to the canvas
canvas.add(cir);
canvas.setWidth(document.body.scrollWidth);
canvas.setHeight(250);
</script>
</body>
</html>
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