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How to lock the vertical movement of Triangle using FabricJS?
<p>In this tutorial, we are going to learn how to lock the vertical 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 X-axis. This can be done by using the <em>lockMovementY</em> property.</p><h2>Syntax</h2><pre class="just-code notranslate language-javascript" data-lang="javascript">new fabric.Triangle({ lockMovementY: Boolean }: Object)</pre><h2>Parameters</h2><ul class="list"><li><p><strong>Options</strong><strong> (optional)</strong> − This parameter is an <em>Object</em> 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 <em>lockMovementY</em> is a property.</p></li></ul><h2>Options Keys</h2><ul class="list"><li><p><strong>lockMovementY</strong> This property accepts a <strong>Boolean</strong> value. If we assign it a 'true' value, then the object will no longer be able to move in the vertical direction.</p></li></ul><h2>Example 1</h2><p><strong>Default behaviour of a Triangle object in the canvas</strong></p><p>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 <em>lockMovementY</em> property is not assigned a 'true' value.</p><pre class="demo-code notranslate language-javascript" data-lang="javascript"><!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 the triangle and drag it around. Observe that you can move the object in both horizontal and vertical 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 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></pre><h2>Example 2</h2><p><strong>Passing lockMovementY as key with 'true' value</strong></p><p>In this example, we will see how we can lock the vertical movement of a triangle object. By assigning the <em>lockMovementY</em> property a 'true' value, we essentially cease movement in the vertical direction.</p><pre class="demo-code notranslate language-javascript" data-lang="javascript"><!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 lockMovementY as key with 'true' value</h2> <p>You can select and drag around the triangle to see that movement in y-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, lockMovementY: true, }); // Add it to the canvas canvas.add(triangle); </script> </body> </html></pre>
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