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How to lock the horizontal movement of a Triangle using FabricJS?
In this tutorial, we are going to learn how to lock the horizontal movement 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 move only in the Y-axis. This can be done by using the lockMovementX property.
Syntax
new fabric.Triangle({ lockMovementX: 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 lockMovementX is a property.
Options Keys
lockMovementX − This property accepts a Boolean value. If we assign it a 'true' value, then the object will no longer be able to move in the horizontal direction.
Example 1
Default behaviour of a Triangle object in the canvas
Let's see a code example to understand how we can move our triangle object in the X-axis or the Y-axis freely when lockMovementX property is not assigned a 'true' value.
<!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 and drag the triangle around to see that its movement in both X-direction and Y-direction is feasible.</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: "#ffc1cc", stroke: "#fbaed2", strokeWidth: 5, }); // Add it to the canvas canvas.add(triangle); </script> </body> </html>
Example 2
Passing lockMovementX as key with 'true' value
In this example, we will see how we can lock the horizontal movement of a triangle object. By assigning the lockMovementX property a 'true' value, we essentially cease its movement in the horizontal direction.
<!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 lockMovementX as key with 'true' value</h2> <p>Select the triangle and drag it around to see that its movement in the X-direction is no longer allowed.</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: "#ffc1cc", stroke: "#fbaed2", strokeWidth: 5, lockMovementX: true, }); // Add it to the canvas canvas.add(triangle); </script> </body> </html>