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How to lock the flipping during scaling of Triangle using FabricJS?
In this tutorial, we are going to learn how to lock the flipping during scaling of a triangle using FabricJS. Just as we can specify the position, colour, opacity and dimension of a triangle object in the canvas, we can also specify whether we want to stop flipping an object during scaling. This can be done by using the lockScalingFlip property.
Syntax
new fabric.Triangle({ lockScalingFlip : 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 lockScalingFlip is a property.
Options Keys
lockMovementY − 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 Triangle object in the canvas
Let's see a code example to understand the default behaviour of a triangle 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>Default behaviour of a Triangle object in the canvas</h2>
<p>Select a corner and drag the triangle diagonally to scale it down and then flip it with further dragging.</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: 70,
width: 90,
height: 80,
fill: "#746cc0",
stroke: "#967bb6",
strokeWidth: 5,
});
// Add it to the canvas
canvas.add(triangle);
</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 triangle object to flip while scaling by using the lockScalingFlip property. As we can see, although we try to flip the triangle 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>Passing lockScalingFlip as key with a 'true' value</h2>
<p>You will no longer be able to flip the triangle while scaling it.</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: 70,
width: 90,
height: 80,
fill: "#746cc0",
stroke: "#967bb6",
strokeWidth: 5,
lockScalingFlip: true,
});
// Add it to the canvas
canvas.add(triangle);
</script>
</body>
</html>
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