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How to flip a Rectangle vertically using FabricJS?
In this tutorial, we are going to learn how we can flip a Rectangle object vertically 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. We can flip a rectangle object vertically using the flipY property.
Syntax
new fabric.Rect({ flipY: Boolean }: 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 object of which flipY is a property.
Options Keys
flipY This property accepts a Boolean value which allows us to flip an object vertically.
Example 1
Passing flipY as key with a False value
Let’s see a code example that shows us the default orientation of a rectangle object in FabricJS. Since we are passing the flipY property a False value, the rectangle 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>Passing flipY as key with a False value</h2>
<p>You can see that the object has not flipped vertically.</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,
borderColor: "purple",
borderScaleFactor: 3,
flipY: false,
});
// Create gradient fill
rect.set(
"fill",
new fabric.Gradient({
type: "linear",
coords: { x1: 0, y1: 0, x2: 0, y2: 50 },
colorStops: [
{ offset: 0, color: "pink" },
{ offset: 1, color: "blue" },
],
})
);
// Add it to the canvas
canvas.add(rect);
</script>
</body>
</html>
Example 2
Passing the flipY property as key with a ‘true’ value
In this example, we have a rectangle object of width 170 px and height 70 px with a vertical linear gradient fill. As we apply the flipY property to the rectangle 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>Passing the flipY property as key with a True value</h2>
<p>You can see now that the object has flipped vertically.</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,
borderColor: "purple",
borderScaleFactor: 3,
flipY: true,
});
// Create gradient fill
rect.set(
"fill",
new fabric.Gradient({
type: "linear",
coords: { x1: 0, y1: 0, x2: 0, y2: 50 },
colorStops: [
{ offset: 0, color: "pink" },
{ offset: 1, color: "blue" },
],
})
);
// Add it to the canvas
canvas.add(rect);
</script>
</body>
</html> 
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