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How to lock the vertical movement of a Rectangle using FabricJS?
In this tutorial, we are going to learn how to lock the vertical movement of a Rectangle using FabricJS. Just as we can specify the position, colour, opacity and dimension of a rectangle object in the canvas, we can also specify whether we want it to move only in the X-axis. This can be done by using the lockMovementY property.
Syntax
new fabric.Rect({ lockMovementY: 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 borderDashArray is a property.
Options keys
lockMovementY − 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 vertical direction.
Example 1
Default behaviour of a Rectangle object in the canvas
Let’s see a code example to understand how we can move our rectangle object in the X-axis or the Y-axis freely when lockMovementY 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 Rectangle object in the canvas</h2> <p>Drag the rectangle across the X-axis and Y-axis to see that movement is allowed in both directions.</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: 55, top: 90, width: 170, height: 70, fill: "black", padding: 9, stroke: "#483d8b", strokeWidth: 5, }); // Add it to the canvas canvas.add(rect); </script> </body> </html>
Example 2
Passing lockMovementY as key with a True value
In this example, we will see how we can lock the vertical movement of a rectangle object. By assigning the lockMovementY property a ‘true’ value, we essentially cease movement in the vertical 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>Default behaviour of a Rectangle object in the canvas</h2> <p>Drag the rectangle across the X-axis and Y-axis to see that the movement is no longer allowed in the vertical direction.</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: 55, top: 90, width: 170, height: 70, fill: "black", padding: 9, stroke: "#483d8b", strokeWidth: 5, lockMovementY: true, }); // Add it to the canvas canvas.add(rect); </script> </body> </html>