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How to lock the rotation of a Triangle using FabricJS?
In this tutorial, we are going to learn how to lock the rotation 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 it to rotate or not. This can be done by using the lockRotation property.
Syntax
new fabric.Triangle({ lockRotation : 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 lockRotation is a property.
Options Keys
lockRotation − This property accepts a Boolean value. If we assign it a 'true' value, then the object rotation will be locked.
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 lockRotation property is not used. By default, we can rotate a triangle object anticlockwise or clockwise.
<!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>You can select triangle and try rotating it to see the default behavior.</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 lockRotation as key with 'true' value
In this example, we will see how we can cease the ability of a triangle object to rotate by using the lockRotation property. As we can see, as soon as we try to rotate the triangle object, a not-allowed cursor is shown. This means that the rotation action 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 lockRotation as key with 'true' value</h2> <p>You can see that you are no longer allowed to rotate the triangle.</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, lockRotation: true, }); // Add it to the canvas canvas.add(triangle); </script> </body> </html>
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