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How to create a Circle with border colour using FabricJS?
In this tutorial, we are going to create a Circle with border colour using FabricJS. Circle is one of the various shapes provided by FabricJS. In order to create a circle, we will create an instance of fabric.Circle class and add it to the canvas. Since FabricJS is extremely flexible, we are allowed to customize our circle object in any way we like. One of the properties that FabricJS provides is borderColor which allows us to manipulate the colour of the border when our object is active.
Syntax
new fabric.Circle({ borderColor: String }: Object)
Parameters
-
options (optional) ? This parameter is an Object which provides additional customizations to our circle. Using this parameter, properties such as colour, cursor, stroke width and a lot of other properties can be changed related to the object of which borderColor is a property.
Options Keys
-
borderColor ? This property accepts a String which determines the colour of the border when our object is actively selected. Its default value is rgb(178,204,255).
Example 1: Using Color Name
Passing borderColour key with a String value
Let's see a code example of how we can assign a value to the borderColor property. We have assigned the value "blue" to the borderColor key which helps to create the blue border on selection of our circle object.
<!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 border colour using FabricJS</h2>
<p>Select the object and observe the blue outline of the selection area. Here we have applied the <b>borderColor</b> property and assigned it 'blue' color. </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: "red",
borderColor: "blue",
});
// Adding it to the canvas
canvas.add(cir);
canvas.setWidth(document.body.scrollWidth);
canvas.setHeight(250);
</script>
</body>
</html>
Example 2: Using RGB Values
Passing a rgba value to the borderColor key
Instead of passing simple colour names as a String, we can also use RGB values, whose components specify the amount of Red, Green, and Blue. In this example we have used rgb(128,0,128) which is the rgb value for the colour purple.
<!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 border colour using FabricJS</h2>
<p>Select the object and notice the purple outline of the selection area. Here we have applied the <b>borderColor</b> property and assigned it an 'rgb' 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: "red",
borderColor: "rgb(128,0,128)",
});
// Adding it to the canvas
canvas.add(cir);
canvas.setWidth(document.body.scrollWidth);
canvas.setHeight(250);
</script>
</body>
</html>
Key Points
The
borderColorproperty only affects the appearance when the object is selectedYou can use color names ("blue", "red"), hex values ("#0000FF"), or RGB/RGBA values
The default border color is a light blue: rgb(178,204,255)
This property works with all FabricJS objects, not just circles
Conclusion
The borderColor property in FabricJS allows you to customize the selection border color of circle objects. You can use various color formats including color names and RGB values to achieve the desired visual effect.
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