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How to add shadow to a Circle using FabricJS?
In this tutorial, we are going to learn how to add a shadow to a Circle using FabricJS. Circle is one of the various shapes provided by FabricJS. In order to create a circle, we will create an instance of fabric.Circle class and add it to the canvas. Our circle 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 a Circle by using the shadow property.
Syntax
new fabric.Circle({ shadow : fabric.Shadow }: Object)
Parameters
- options (optional) − This parameter is an Object which provides additional customizations to our circle. 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 triangle object. For example, in order to add a shadow to our Circle object we need to create a new instance of fabric.Shadow and then assign that instance to shadow property.
Example 1
Passing the shadow object to the shadow property
Let's see an example to understand how we can assign the shadow property value, by which a shadow will be added to our Circle object. Firstly, 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>Adding shadow to a circle using FabricJS</h2>
<p>Notice the shadow around the circle object. Here we have applied the <b>shadow</b> property. </p>
<canvas id="canvas"></canvas>
<script>
// Initiate a canvas instance
var canvas = new fabric.Canvas("canvas");
// Initiate a shadow instance
var shadow = new fabric.Shadow({
color: "black",
blur: 20
});
var circle = new fabric.Circle({
left: 115,
top: 50,
radius: 50,
fill: "#85bb65",
shadow: shadow
});
canvas.add(circle);
canvas.setWidth(document.body.scrollWidth);
canvas.setHeight(250);
</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, blue, green 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>Adding shadow to a circle using FabricJS</h2>
<p>Notice the shadow around the circle object. Here we have passed an 'rgba' value to assign the color.</p>
<canvas id="canvas"></canvas>
<script>
// Initiate a canvas instance
var canvas = new fabric.Canvas("canvas");
// Initiate a shadow instance
var shadow = new fabric.Shadow({
color: "rgba(0,128,0,0.8)",
blur: 20
});
var circle = new fabric.Circle({
left: 115,
top: 50,
radius: 50,
fill: "#85bb65",
shadow: shadow
});
canvas.add(circle);
canvas.setWidth(document.body.scrollWidth);
canvas.setHeight(250);
</script>
</body>
</html>
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