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How to set the width of a Triangle using FabricJS?
<p>In this tutorial, we are going to learn how to set the width 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>We can manipulate a triangle object by changing its position, opacity, stroke and also its dimension. FabricJS allows us to control an object's dimensions by using the <em>width</em> and <em>height properties</em>.</p><h2>Syntax</h2><pre class="just-code notranslate language-javascript" data-lang="javascript">new fabric.Triangle({ width: Number }: Object)</pre><h2>Parameters</h2><ul class="list"><li><p><strong>Options (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>width</em> is a property.</p></li></ul><h2>Options Keys</h2><ul class="list"><li><p><strong>width</strong> − This property accepts a <strong>Number</strong> value which allows us to specify the object's width. Its default value is 100.</p></li></ul><h2>Example 1</h2><p><strong>Default behaviour of <strong>width</strong> property</strong></p><p>Let's see a code example to understand the default behaviour of the width property.</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 width property</h2>
<p>You can see that the default value of triangle's width is 100</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: 60,
top: 50,
fill: "#b0e0e6",
height: 90,
});
// Add it to the canvas
canvas.add(triangle);
</script>
</body>
</html></pre><h2>Example 2</h2><p><strong>Passing <em>width</em> property as key</strong></p><p>Now that we have assigned the <em>width</em> property a value of 180px, we can see the changes in its width.</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 width property as key</h2>
<p>You can see that the triangle's width now has a fixed value of 180.</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: 60,
top: 50,
fill: "#b0e0e6",
height: 90,
width: 180,
});
// Add it to the canvas
canvas.add(triangle);
</script>
</body>
</html></pre>
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