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How to lock the vertical scaling of Triangle using FabricJS?
<p>In this tutorial, we are going to learn how to lock the vertical 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 scaling an object vertically. This can be done by using the <em>lockScalingY</em> property.</p><h2>Syntax</h2><pre class="just-code notranslate language-javascript" data-lang="javascript">new fabric.Triangle({ lockScalingY : 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>lockScalingY</em> is a property.</p></li></ul><h2>Options Keys</h2><ul class="list"><li><p><strong>lockScalingY</strong><strong> </strong>− This property accepts a <strong>Boolean</strong> value. If we assign it a 'true' value, then the object's vertical scaling will be locked.</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 the default behaviour of a Triangle object when <em>lockScalingY</em> property is not used. Scaling the object in both horizontal and vertical directions is feasible.</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 scale the triangle in horizontal and vertical directions to verify that scaling in both directions is possible.</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></pre><h2>Example 2</h2><p><strong>Passing <em>lockScalingY</em> as key with 'true' value</strong></p><p>In this example, we will see how we can cease the ability of a Triangle object to scale vertically using the <em>lockScalingY</em> property. As we can see, although we can scale the triangle object horizontally, we are not allowed to perform the same action vertically.</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 lockScalingY as key with 'true' value</h2> <p>You can see a not-allowed cursor if you try to scale the triangle in the y-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 triangle object var triangle = new fabric.Triangle({ left: 105, top: 70, width: 90, height: 80, fill: "#746cc0", stroke: "#967bb6", strokeWidth: 5, lockScalingY: true, }); // Add it to the canvas canvas.add(triangle); </script> </body> </html></pre>
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