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Disable Centered Scaling of a Triangle Using Fabric.js
In this tutorial, we are going to learn how to disable the centered scaling of Triangle using FabricJS. Triangle is one of the various shapes provided by FabricJS. In order to create a triangle, we will have to create an instance of fabric.Triangle class and add it to the canvas.
When an object is scaled via controls, assigning a True value to the centeredScaling property, the origin of transformation is its center.
Syntax
new fabric.Triangle({ centeredScaling: Boolean }: Object)
Parameters
Options (optional) This parameter is an Object which provides additional customizations to our triangle. 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 centeredScaling is a property.
Options Keys
centeredScaling This property accepts a Boolean value and allows us to control whether the object should use its center as its origin of transformation or not.
Example 1
Passing centeredScaling as key and assigning a "true" value to it
Let's see a code example to see how a triangle object behaves when centeredScaling property is enabled. When we scale the object up, the origin of transformation is the center of the triangle.
<!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 centeredScaling as key and assigning it a "true" value</h2>
<p>Try scaling the triangle to see that it is using its center as the center of transformation.</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 triangle object
var triangle = new fabric.Triangle({
left: 105,
top: 60,
width: 100,
height: 70,
fill: "#5f9ea0",
centeredScaling: true,
});
// Add it to the canvas
canvas.add(triangle);
</script>
</body>
</html>
Example 2
Disabling centeredScaling property
We can disable the centeredScaling property by assigning it a False value. This will not use the center of the triangle as the center of transformation anymore. Here is a code example to demonstrate that
<!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 centeredScaling property</h2>
<p>Try scaling the triangle to see that it is using one of its corners as the center of transformation.</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 triangle object
var triangle = new fabric.Triangle({
left: 105,
top: 60,
width: 100,
height: 70,
fill: "#5f9ea0",
centeredScaling: false,
});
// Add it to the canvas
canvas.add(triangle);
</script>
</body>
</html>
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