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How to create a Circle with a background colour using FabricJS?
In this tutorial, we are going to create a Circle with background colour using FabricJs. Circle is one of the various shapes provided by FabricJS. In order to create a circle, we have to create an instance of fabric.Circle 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 circle lives) which is square in shape.
Syntax
new fabric.Circle({ backgroundColor: String }: 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 backgroundColor is a property.
Options Keys
backgroundColor − This property accepts a String which determines the colour of our object's background. The value can be a hexadecimal value, an rgba value or simply the name of the colour which we want our background colour to be.
Example 1
Passing backgroundColor property as key with a hexadecimal value
Let's see an example to assign a background colour to our circle object using hexadecimal value of colour. In this example, we have used the Hex colour code #d0db61 which is a dark-khaki 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 a circle with a background colour using FabricJS</h2>
<p>Notice the dark-khaki background around the circle. It appears as we have applied the <b>backgroundColor</b> property and assigned it a Hex color code. </p>
<canvas id="canvas"></canvas>
<script>
// Initiate a canvas instance
var canvas = new fabric.Canvas("canvas");
var cir = new fabric.Circle({
left: 215,
top: 100,
radius: 50,
fill: "#74c365",
stroke: "#00b7eb",
strokeWidth: 2,
backgroundColor: "#d0db61",
});
// Adding it to the canvas
canvas.add(cir);
canvas.setWidth(document.body.scrollWidth);
canvas.setHeight(250);
</script>
</body>
</html>Example 2
Passing backgroundColor property as key with a rgba value
We can use an RGBA (red, blue, green, and alpha) 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 (255,0,0,0.7) which is the colour red with 0.7 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>Creating a circle with a background colour using FabricJS</h2>
<p>Notice the orange-red background around the circle. Here we have used the <b>backgroundColor</b> property and assigned it an 'rgba' value. </p>
<canvas id="canvas"></canvas>
<script>
// Initiate a canvas instance
var canvas = new fabric.Canvas("canvas");
var cir = new fabric.Circle({
left: 215,
top: 100,
radius: 50,
fill: "green",
stroke: "blue",
strokeWidth: 2,
backgroundColor: "rgba(255,0,0,0.7)",
});
// Adding it to the canvas
canvas.add(cir);
canvas.setWidth(document.body.scrollWidth);
canvas.setHeight(250);
</script>
</body>
</html>
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