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How to set the border scale factor of Triangle using FabricJS?
<p>In this tutorial, we are going to set the border scale factor of 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 use the <em>borderScaleFactor</em> property which specifies the scale factor of the object's controlling borders.</p><h2>Syntax</h2><pre class="just-code notranslate language-javascript" data-lang="javascript">new fabric.Triangle({ borderScaleFactor: 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>borderScaleFactor</em> is a property.</p></li></ul><h2>Options Keys</h2><ul class="list"><li><p><strong>borderScaleFactor</strong> − This property accepts a <em>Number</em> which specifies the border thickness. The default value is 1.</p></li></ul><h2>Example 1</h2><p><strong>Default behaviour of <em>borderScaleFactor</em> property</strong></p><p>Let's see a code example that depicts the default behaviour of the <em>borderScaleFactor</em> property. Although we have specified it in this example, by default the value that <em>borderScaleFactor</em> uses even when unspecified is 1.</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 borderScaleFactor property</h2>
<p>Select the triangle to see the default value of borderScaleFactor</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: "#deb887",
borderColor: "red",
borderScaleFactor: 1,
});
// Add it to the canvas
canvas.add(triangle);
</script>
</body>
</html></pre><h2>Example 2</h2><p><strong>Passing borderScaleFactor as key</strong></p><p>Let's see a code example to increase the border thickness of the triangle object when it is actively selected. In this example, we have assigned the <em>borderScaleFactor</em> a value of 5 which specifies the thickness of our border.</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 borderScaleFactor as key</h2>
<p>Select the triangle to see the changed value of borderScaleFactor</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: "#deb887",
borderColor: "red",
borderScaleFactor: 5,
});
// Add it to the canvas
canvas.add(triangle);
</script>
</body>
</html></pre>
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