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How to create a Rectangle with background colour using FabricJS?
In this tutorial, we are going to create a Rectangle with background colour 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.
The backgroundColor property allows us to assign a colour to our object’s background. It is the colour of the container where the rectangle lives and is rectangular in shape for the rectangle.
Syntax
new fabric.Rect({ backgroundColor: String }: 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 of which backgroundColor is a property.
Options Keys
backgroundColor This property accepts a value of type String which will determine the background colour.
Example 1
Passing backgroundColor property as key with a hexadecimal value
Let’s see a code example to assign a background colour to our Rectangle object using a hexadecimal value. In this example, we have used the hex colour code #ffb347 which is an orange 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 backgroundColor property as key with a hexadecimal value</h2>
<p>You can see the new background colour on 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 rectangle object
var rect = new fabric.Rect({
left: 115,
top: 50,
width: 100,
height: 70,
fill: "rgba(255,255,255, 0.1)",
borderColor: "black",
backgroundColor: "#ffb347",
});
// Add it to the canvas
canvas.add(rect);
</script>
</body>
</html>
Example 2
Passing backgroundColor property as key with an RGBA value
We can use an RGBA value, instead of a hexadecimal colour code. The alpha parameter specifies the opacity of a colour. In this example, we have used the rgba value (207,16,32,0.9) which is the colour red with 0.9 opacity.
<!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 backgroundColor property as key with an RGBA value</h2>
<p>You can see the new background colour on 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 rectangle object
var rect = new fabric.Rect({
left: 125,
top: 90,
width: 170,
height: 70,
fill: "rgba(255,255,255, 0.1)",
borderColor: "black",
backgroundColor: "rgba(207,16,32,0.9)",
});
// Add it to the canvas
canvas.add(rect);
</script>
</body>
</html>
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