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How to make the controlling corners of a Rectangle transparent using FabricJS?
<p>In this tutorial, we are going to learn how to make the controlling corners of Rectangle transparent using FabricJS. Rectangle is one of the various shapes provided by FabricJS. In order to create a Rectangle, we will have to create an instance of fabric.Rect class and add it to the canvas. The <em>transparentCorners</em> property allows us to make the controlling corners of Rectangle transparent.</p><h2>Syntax</h2><pre class="result notranslate">new fabric.Rect( { transparentCorners: Boolean }: 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 rectangle. 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> transparentCorners</em> is a property.</p></li></ul><h2>Options keys</h2><ul class="list"><li><p><strong>transparentCorners</strong> − This property accepts a <strong>Boolean</strong> value which allows us to render the controlling corners of an object as transparent. Its default value is true.</p></li></ul><h2>Example 1</h2><p><strong>Passing transparentCorners property as key with a ‘false’ value</strong></p><p>Let’s see a code example to create a rectangle object with controlling corners that are not transparent. To achieve this, we need to pass the <em>t</em><em>ransparentCorners</em> property a False value.</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 transparentCorners property as key with a "False" value</h2>
<p>You can select the rectangle to see that the controlling corners are opaque.</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 rectangle object
var rect = new fabric.Rect({
left: 155,
top: 70,
width: 170,
height: 70,
fill: "#f4f0ec",
stroke: "#2a52be",
strokeWidth: 5,
transparentCorners: false,
});
// Add it to the canvas
canvas.add(rect);
</script>
</body>
</html></pre><h2>Example 2</h2><p><strong>Passing transparentCorners as key with a "True" value</strong></p><p>In this example, we are passing the <em>transparentCorners</em> property a true value. This will make sure that the controlling corners are rendered as transparent. Note that this is also the default behaviour.</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 transparentCorners as key with a "True" value</h2>
<p>You can select the rectangle to see that the controlling corners are transparent.</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 rectangle object
var rect = new fabric.Rect({
left: 155,
top: 70,
width: 170,
height: 70,
fill: "#f4f0ec",
stroke: "#2a52be",
strokeWidth: 5,
transparentCorners: true,
});
// Add it to the canvas
canvas.add(rect);
</script>
</body>
</html></pre>
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