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How to flip a Textbox vertically using FabricJS?
In this tutorial, we are going to learn how we can flip a Textbox object vertically using FabricJS. We can customize, stretch or move around the text written in a textbox. In order to create a textbox, we will have to create an instance of fabric.Textbox class and add it to the canvas. We can flip a textbox object vertically using the flipY property.
Syntax
new fabric.Textbox(text: String, { flipY: Boolean }: Object)
Parameters
-
text ? This parameter accepts a String which is the text string that we want to display inside our textbox.
-
options (optional) ? This parameter is an Object which provides additional customizations to our textbox. 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: Default Orientation (flipY: false)
Let's see a code example that shows us the default orientation of a textbox object in FabricJS. Since we are passing the flipY property a "false" value, the text 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 text 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 textbox object
var textbox = new fabric.Textbox("Fall seven times, stand up eight.", {
backgroundColor: "#e3dac9",
width: 400,
left: 70,
top: 70,
flipY: false,
});
// Create gradient fill
textbox.set(
"fill",
new fabric.Gradient({
type: "linear",
coords: { x1: 0, y1: 0, x2: 0, y2: 100 },
colorStops: [
{ offset: 0, color: "#545a2c" },
{ offset: 1, color: "#6495ed" },
],
})
);
// Add it to the canvas
canvas.add(textbox);
</script>
</body>
</html>
Example 2: Flipped Vertically (flipY: true)
In this example, we have a textbox object of width 400px with a vertical linear gradient fill. As we apply the flipY property to the textbox object, it flips vertically and thus we see that both the gradient and the text have 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 that the text 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 textbox object
var textbox = new fabric.Textbox("Fall seven times, stand up eight.", {
backgroundColor: "#e3dac9",
width: 400,
left: 70,
top: 70,
flipY: true,
});
// Create gradient fill
textbox.set(
"fill",
new fabric.Gradient({
type: "linear",
coords: { x1: 0, y1: 0, x2: 0, y2: 100 },
colorStops: [
{ offset: 0, color: "#545a2c" },
{ offset: 1, color: "#6495ed" },
],
})
);
// Add it to the canvas
canvas.add(textbox);
</script>
</body>
</html>
Key Points
- The
flipYproperty accepts a boolean value (true or false) - When
flipY: true, the textbox flips vertically along its horizontal axis - Both the text content and any applied styling (like gradients) are flipped together
- The flip transformation does not affect the positioning coordinates of the object
Conclusion
The flipY property in FabricJS provides an easy way to flip textbox objects vertically. Setting it to true mirrors the textbox along its horizontal axis, while false maintains the default orientation.
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