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How to set the horizontal scale factor of a Triangle using FabricJS?
<p>In this tutorial, we are going to learn how to set the horizontal scale factor of a Triangle using FabricJS. Triangle is one of the various shapes provided by FabricJS. In order to create a triangle, we will have to create an instance of <em>fabric.Triangle</em> class and add it to the canvas.</p><p>Just as we can specify the position, colour, opacity and dimension of a triangle object in the canvas, we can also set the horizontal scale of a triangle object. This can be done by using the <em>scaleX</em> property.</p><h2>Syntax</h2><pre class="just-code notranslate language-javascript" data-lang="javascript">new fabric.Triangle({ scaleX : Number }: 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>scaleX</em> is a property.</p></li></ul><h2>Options Keys</h2><ul class="list"><li><p><strong>scaleX</strong> − This property accepts a <strong>Number</strong> value. The value that is assigned, determines the horizontal object scale factor. Its default value is 1.</p></li></ul><h2>Example 1</h2><p><strong>Default appearance when <em>scaleX</em> is not used</strong></p><p>Let's see a code example that displays the appearance of our triangle object when the <em>scaleX</em> property is not used. By default, the horizontal scale factor of the triangle object is 1. scaleX determines the transformation that resizes an object along the X-axis.</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 appearance when scaleX is not used</h2> <p>You can see that there is no resizing along the x-axis</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>scaleX</em> property as key</strong></p><p>In this example, we are passing the <em>scaleX</em> property as a key with a value of 2. This means that the triangle object's scale factor in the horizontal direction is doubled.</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 scaleX property as key</h2> <p>Notice that the object's horizontal width has now doubled</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, scaleX: 2, }); // Add it to the canvas canvas.add(triangle); </script> </body> </html></pre>
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