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How to flip a Circle vertically using FabricJS?
In this tutorial, we are going to learn how we can flip a Circle object vertically using FabricJS. Circle is one of the various shapes provided by FabricJS. In order to create a circle, we will have to create an instance of fabric.Circle class and add it to the canvas. We can flip a circle object vertically using the flipY property.
Syntax
new fabric.Circle({ flipY: Boolean }: 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 flipY is a property.
Options Keys
-
flipY ? This property accepts a Boolean value. It allows us to flip an object vertically.
Example 1: Default Orientation (flipY: false)
Let's see an example that shows us the default orientation of a circle object in FabricJS. Since we are passing the flipY property a false value, the circle object will not be flipped vertically.
<!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>How to flip a Circle vertically using FabricJS?</h2>
<p>This is the default orientation of the object. We have set <b>flipY</b> as False, but even if we don't use it, <b>flipY</b> will be by default set to False. </p>
<canvas id="canvas"></canvas>
<script>
// Initiate a canvas instance
var canvas = new fabric.Canvas("canvas");
var circle = new fabric.Circle({
left: 215,
top: 50,
fill: "green",
radius: 80,
stroke: "#228b22",
strokeWidth: 2,
flipY: false
});
// Create gradient fill
circle.set("fill", new fabric.Gradient({
type: "linear",
coords: {
x1: 0,
y1: 0,
x2: 0,
y2: 50
},
colorStops: [{
offset: 0,
color: "red"
}, {
offset: 1,
color: "green"
}]
}));
// Adding them to the canvas
canvas.add(circle);
canvas.setWidth(document.body.scrollWidth);
canvas.setHeight(250);
</script>
</body>
</html>
Example 2: Flipped Vertically (flipY: true)
In this example, we have a circle object of radius 80px with a vertical linear gradient fill. As we apply the flipY property to the circle object, it flips vertically and thus we see that the gradient has flipped as well.
<!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>How to flip a Circle vertically using FabricJS?</h2>
<p>Here observe that the circle has flipped vertically (see the gradient), as we have set <b>flipY</b> to True.</p>
<canvas id="canvas"></canvas>
<script>
// Initiate a canvas instance
var canvas = new fabric.Canvas("canvas");
var circle = new fabric.Circle({
left: 215,
top: 50,
fill: "green",
radius: 80,
stroke: "#228b22",
strokeWidth: 2,
flipY: true
});
// Create gradient fill
circle.set("fill", new fabric.Gradient({
type: "linear",
coords: {
x1: 0,
y1: 0,
x2: 0,
y2: 50
},
colorStops: [{
offset: 0,
color: "red"
}, {
offset: 1,
color: "green"
}]
}));
// Adding them to the canvas
canvas.add(circle);
canvas.setWidth(document.body.scrollWidth);
canvas.setHeight(250);
</script>
</body>
</html>
Key Points
- The
flipYproperty takes a Boolean value (true or false) - When
flipYis set tofalse(default), the circle maintains its original orientation - When
flipYis set totrue, the circle is flipped vertically along its horizontal axis - The flip effect is most visible when the circle has asymmetric content like gradients or patterns
Conclusion
The flipY property in FabricJS provides an easy way to flip circle objects vertically. This is particularly useful when working with gradients or asymmetric designs where the vertical orientation matters.
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