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How to add shadow to a Rectangle using FabricJS?
In this tutorial, we are going to learn how to add a shadow to a Rectangle 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.
Our rectangle object can be customized in various ways like changing its dimensions, adding a background color, or even adding a shadow to it. We can add a shadow to the rectangle by using the shadow property.
Syntax
new fabric.Rect({ shadow : fabric.Shadow }: Object)Parameters
Options (optional) − This parameter is an Object 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 shadow is a property.
Options Keys
shadow − This property accepts a fabric.Shadow object which allows us to add a shadow to our Rectangle object. For example, in order to add a shadow to our Rectangle object, we need to create a new instance of fabric.Shadow and then assign that instance to the shadow property.
Example 1
Passing the shadow object to the shadow property
Let’s see a code example to understand how we can assign the shadow property a value such that a shadow will be added to our rectangle object. First, we need to make a new instance of fabric.Shadow and then assign that instance to our shadow property.
<!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 the shadow object to the shadow property</h2>
<p>You can see that an orange shadow has been added to the rectangle</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 shadow instance
var shadow = new fabric.Shadow({
color: "orange",
blur: 20,
});
// Initiate a rectangle object
var rect = new fabric.Rect({
left: 105,
top: 70,
width: 170,
height: 70,
fill: "#00b7eb",
stroke: "#ffa089",
strokeWidth: 5,
padding: 50,
shadow: shadow,
});
// Add it to the canvas
canvas.add(rect);
</script>
</body>
</html>Example 2
Passing an "rgba" value to the shadow object
We can also adjust the shadow and give it a blurred-out appearance by assigning it an "rgba" value which stands for red, green, blue and alpha. Alpha determines the opacity of the colour.
<!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 an rgba value to the shadow object</h2>
<p>You can see the new shadow created using rgba value</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 shadow instance
var shadow = new fabric.Shadow({
color: "rgba(255,69,0, 0.7)",
blur: 20,
});
// Initiate a rectangle object
var rect = new fabric.Rect({
left: 105,
top: 70,
width: 170,
height: 70,
fill: "#00b7eb",
stroke: "#ffa089",
strokeWidth: 5,
padding: 50,
shadow: shadow,
});
// Add it to the canvas
canvas.add(rect);
</script>
</body>
</html>
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