How to disable centered scaling of a rectangle using FabricJS?
In this tutorial, we will learn how to disable centered scaling of a rectangle using FabricJS. Rectangle is one of the various shapes provided by FabricJS. In order to create a rectangle, we need to create an instance of the fabric.Rect class and add it to the canvas. When scaling via a controller, set the centeredScaling property to true to use the center as the starting point for the object's transformation.
Syntax
new fabric.Rect({ centeredScaling: Boolean }: Object)Parameters
Options (optional) − This parameter is an Object which provides additional customizations to our rectangle. 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. When this property is true, the object uses the center as its origin of transformation.
Example 1
Passing centeredScaling as key and assigning a “true” value to it
Let's see a code example to see how a rectangle object behaves when centeredScaling property is enabled. When we scale the object up the origin of transformation is the center of the rectangle.
<!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 id="Passing-centeredScaling-as-key-and-assigning-a-true-value-to-it">Passing centeredScaling as key and assigning a "true" value to it</h2>
<p>Try scaling the rectangle to see that centered scaling has been enabled</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 rectangle object
var rect = new fabric.Rect({
left: 125,
top: 90,
width: 170,
height: 70,
fill: "#cf1020",
borderColor: "black",
borderScaleFactor: 3,
centeredScaling: true,
});
// Add it to the canvas
canvas.add(rect);
</script>
</body>
</html>Example 2
Disable the centeredScaling attribute
We can disable the centeredScaling attribute by assigning it a value of False. This will no longer use the center of the rectangle as the center of the transformation. Here is a code example to demonstrate this -
<!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 id="Disabling-the-centeredScaling-property">Disabling the centeredScaling property</h2>
<p>Try scaling the rectangle to see that centered scaling has been disabled</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 rectangle object
var rect = new fabric.Rect({
left: 125,
top: 90,
width: 170,
height: 70,
fill: "#cf1020",
borderColor: "black",
borderScaleFactor: 3,
centeredScaling: false,
});
// Add it to the canvas
canvas.add(rect);
</script>
</body>
</html>The above is the detailed content of How to disable centered scaling of a rectangle using FabricJS?. For more information, please follow other related articles on the PHP Chinese website!
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