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How to create a canvas with Rectangle using FabricJS?
In this tutorial, we are going to learn how to create a canvas with a Rectangle object using FabricJS. Rectangle is one of the various 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.
Syntax
new fabric.Rect({ width: Number, height: Number }: 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 rectangle object of which width and height are properties.
Options Keys
width This property accepts a Number which specifies the object’s width.
height This property accepts a Number which specifies the object’s height.
Example 1
Creating an instance of fabric.Rect() and adding it to our canvas
Let’s see a code example of how we can add a rectangle to our canvas. Here we have created an object with a width of 100px and a height of 70px. Also, we have used the colour "green" as a fill 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>Creating an instance of fabric.Rect() and adding it to our canvas</h2>
<p>You can click on the rectangle and interact with it</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: 115,
top: 50,
width: 100,
height: 70,
fill: "green",
});
// Add it to the canvas
canvas.add(rect);
</script>
</body>
</html>
Example 2
Manipulating the Rectangle object by using the set method
In this example, we have assigned the properties to the rectangle by using the set method which is a setter for values. Any property related to stroke, strokeWidth, angle, 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>Manipulating the Rectangle object by using the set method</h2>
<p>You can click on the rectangle and interact with it</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();
// Using set to set the properties
rect.set("left", 119);
rect.set("top", 60);
rect.set("width", 170);
rect.set("height", 90);
rect.set("angle", 45);
rect.set("fill", "#bdda57");
rect.set("stroke", "#d9e650");
rect.set("strokeWidth", 4);
// Add it to the canvas
canvas.add(rect);
</script>
</body>
</html>
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