In this tutorial, we will learn how to create a canvas with a Circle object using FabricJS. Circles are one of the various shapes provided by FabricJS. In order to create a circle, we must create an instance of the Fabric.Circle class and add it to the canvas.
Syntax
new fabric.Circle({ radius: Number }: Object)Parameters
Options (optional) - This parameter is a Objects Provides additional customization for our objects. Using this parameter, you can change properties such as color, cursor, stroke width, and many other properties related to a circle with the radius attribute.
ul>Radius - This property accepts a Number Determine the radius of the circle. If we don't specify a radius, the circle will not appear on the canvas.
Option Key
Example 1
Create an instance of Fabric.Circle() and add it to our canvas
Let’s See an example of how to add a circle to the canvas. Here we create a circle with a radius of 50px. The stroke attribute represents the border color, and the stroke width specifies its width. We fill our object with a sky blue color, whose hex 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 id="Creating-a-canvas-with-circle-using-FabricJS">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
Use the set method to operate the Circle object
In this example, we use the set method to be the setter of the value . Any properties related to stroke, stroke width, radius, scale, rotation, etc. can be changed 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 id="Creating-a-canvas-with-circle-using-FabricJS">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>The above is the detailed content of How to create a canvas with a Circle using FabricJS?. For more information, please follow other related articles on the PHP Chinese website!
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