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Set Size of Controlling Corners of a Circle Using Fabric.js
In this tutorial, we are going to learn how to set the size of the controlling corners of a Circle using FabricJS. The controlling corners of an object allow us to scale, stretch or change its position. We can customize our controlling corners in many ways such as adding a specific colour to it, changing its size etc. We can change the size by using the cornerSize property.
Syntax
new fabric.Circle({ cornerSize: Number }: 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 cornerSize is a property.
Options Keys
cornerSize − This property accepts a Number which allows us to manipulate the size of the controlling corners of a selected object. Its default value is 13.
Example 1
Default size of the controlling corners
Let's see a code that depicts the default size of the controlling corners of a circle object when it is actively selected.
<!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>Setting the size of the controlling corners of a circle using FabricJS</h2>
<p>Select the object and notice the size of its controlling corners. This is the default appearance. Here we haven't used the <b>cornerSize</b> property.</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,
fill: "white",
radius: 50,
stroke: "#c154c1",
strokeWidth: 5,
borderColor: "#daa520",
cornerColor: "rgb(255,20,147)"
});
// Adding it to the canvas
canvas.add(cir);
canvas.setWidth(document.body.scrollWidth);
canvas.setHeight(250);
</script>
</body>
</html>
Example 2
Passing cornerSize as key with a custom value
In this example, we are passing the cornerSize property as key with a value of 7. We can see how that changes the size of our controlling corners when the circle object is selected.
<!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>Setting the size of the controlling corners of a circle using FabricJS</h2>
<p>Select the object and notice the size of its controlling corners. Here we have set the <b>cornerSize</b> at 7. </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,
fill: "white",
radius: 50,
stroke: "#c154c1",
strokeWidth: 5,
borderColor: "#daa520",
cornerColor: "rgb(255,20,147)",
cornerSize: 7
});
// Adding it to the canvas
canvas.add(cir);
canvas.setWidth(document.body.scrollWidth);
canvas.setHeight(250);
</script>
</body>
</html>
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