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Create a Canvas with Circle Using Fabric.js
In this tutorial, we are going to learn about how to create a canvas with a Circle object using FabricJS. Circle is one of the various shapes provided by FabricJS. In order to create a circle, we will have to create an instance of fabric.Circle class and add it to the canvas.
Syntax
new fabric.Circle({ radius: Number }: Object)
Parameters
options (optional) − This parameter is an Object which provides additional customizations to our object. Using this parameter, properties such as colour, cursor, stroke width and a lot of other properties can be changed related to the circle of which radius is a property.
Options Keys
radius − This property accepts a Number which determines the radius of the circle. If we don't specify a radius, our circle would not be displayed on our canvas.
Example 1
Creating an instance of fabric.Circle() and adding it to our canvas
Let's see an example of how we can add a circle to our canvas. Here we have created a circle with radius 50px. The stroke property signifies the border-colour and strokeWidth specifies how wide it shall be. We have used sky-blue colour to fill in our object whose hexadecimal value is #80daeb.
<!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>Creating a canvas with circle using FabricJS</h2>
<p>Here we have created a circle of radius 50px over a canvas. In addition, we have used the <b>fill</b> and <b>stroke</b> properties to color its body and outline. </p>
<canvas id="canvas"></canvas>
<script>
// Initiate a canvas instance
var canvas = new fabric.Canvas("canvas");
// Creating an instance of the fabric.Circle class
var circle = new fabric.Circle({
left: 215,
top: 100,
radius: 50,
fill: "#80daeb",
stroke: "#00b7eb",
strokeWidth: 2,
});
// Adding it to the canvas
canvas.add(circle);
canvas.setWidth(document.body.scrollWidth);
canvas.setHeight(250);
</script>
</body>
</html>
Example 2
Manipulating the Circle object by using the set method
In this example, we have assigned the properties to the circle by using the set method which is a setter for values. Any property related to stroke, strokeWidth, radius, scaling, rotation, etc., can be mutated by using this method.
<!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>Creating a canvas with circle using FabricJS</h2>
<p>Here we have used the <b>set</b> method to create a circle of radius 40px and then filled the object with a color. </p>
<canvas id="canvas"></canvas>
<script>
// Initiate a canvas instance
var canvas = new fabric.Canvas("canvas");
var circle = new fabric.Circle();
canvas.add(circle);
// Use set to set the properties
circle.set("radius", 40);
circle.set("fill", "green");
circle.set({
stroke: "rgba(133, 187, 101, 0.7)",
strokeWidth: 4
});
circle.set("left", 50);
circle.set("top", 50);
canvas.setWidth(document.body.scrollWidth);
canvas.setHeight(250);
</script>
</body>
</html>
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