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How to set the size of the controlling corners of a Triangle using FabricJS?
<p>In this tutorial, we are going to learn how to set the size of the controlling corners of a Triangle using FabricJS. The controlling corners of an object allow us to scale, stretch or change its position. We can customize our controlling corners in many ways such as adding a specific colour to it, changing its size etc. We can change the size by using the <em>cornerSize</em> property.</p><h2>Syntax</h2><pre class="just-code notranslate language-javascript" data-lang="javascript">new fabric.Triangle({ cornerSize: 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>cornerSize</em> is a property.</p></li></ul><h2>Options Keys</h2><ul class="list"><li><p><strong>cornerSize</strong> − This property accepts a <strong>Number</strong> which allows us to manipulate the size of the controlling corners of a selected object. Its default value is 13.</p></li></ul><h2>Example 1</h2><p><strong>Default size of the controlling corners</strong></p><p>Let's see a code example that depicts the default size of the controlling corners of a triangle object when it is actively selected.</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 size of the controlling corners</h2> <p>Select the triangle to see the default size of controlling corners</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: 60, width: 100, height: 70, fill: "#5f9ea0", cornerColor: "rgba(255,103,0,0.9)", }); // Add it to the canvas canvas.add(triangle); </script> </body> </html></pre><h2>Example 2</h2><p><strong>Passing cornerSize as key with a custom value</strong></p><p>In this example, we are passing the <em>cornerSize </em>property as key with a value of 17. We can see how that changes the size of our controlling corners when the triangle object is selected.</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 cornerSize as key with a custom value</h2> <p>Select the triangle to see the increased size of the controlling corners.</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: 60, width: 100, height: 70, fill: "#5f9ea0", cornerColor: "rgba(255,103,0,0.9)", cornerSize: 17, }); // Add it to the canvas canvas.add(triangle); </script> </body> </html></pre>
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