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How to vertically flip a text canvas using Fabric.js ?
There are two simple ways to flip a text canvas using Fabric.js vertically. You can use scaleY property or flipY property. The scaleY property determines how much the object should be scaled along the vertical axis. While the flipY property is a boolean property that defines the vertical flip state of an object.
Fabric.js is a powerful and flexible JavaScript library that makes it easy to work with HTML5 canvas. It provides an object model that allows you to create, manipulate, and render graphics, images, and text on a canvas. Fabric.js abstracts away the complexities of the HTML5 canvas API and provides a simple, high-level API for creating and manipulating graphics.
Using ScaleY Property
The scaleY property in Fabric.js represents the vertical scaling factor for an object. It determines the amount by which the object should be scaled along the vertical axis. A value of 1 means no scaling, a value of -1 means the object is flipped vertically, and a value greater than or less than 1 will result in a proportional scaling of the object along the vertical axis.
This method is better when you flip the text along the y-axis while preserving its original size and proportions.
Syntax
Users can follow the below syntax for using the scaleY property to flip an object using Fabric.js vertically.
// on button click
flipped = !flipped ;
if (flipped) {
object.set('scaleY', -1) ;
}
else {
object.set('scaleY', 1) ;
}
Here, the Boolean value of flipped variable changes on button click. The scaleY property is set to -1 when flipped value is true, causing the object to flip. The value is set to 1 when flipped value is false, which brings the object back to its original orientation.
Example
In the below example, we have used the scaleY property to flip the text. It is a basic example of how to use Fabric.js to flip text vertically on a HTML canvas. It sets up an HTML canvas element with a border and a button with the text "Flip Text". When the button is clicked, a Fabric.js canvas is created, and a text object is added to the canvas with certain properties such as font size, fill color, and shadow. Finally, the "renderAll" method is called to render the updated canvas.
<html>
<head>
<script src = "https://cdnjs.cloudflare.com/ajax/libs/fabric.js/4.0.0-beta.12/fabric.min.js"> </script>
<style>
canvas {
border: 1px solid black;
}
</style>
</head>
<body>
<canvas id = "canvas" width = "200" height = "200"> </canvas>
<button id = "flipButton"> Flip Text </button>
<script>
const canvas = new fabric.Canvas('canvas');
let flipped = false;
const text = new fabric.Text('Text to flip', {
left: 50,
top: 80,
fontSize: 24,
fill: 'purple',
shadow: {
color: 'rgba(0,0,0,0.3)',
blur: 10,
offsetX: 10,
offsetY: 10
}
});
canvas.add(text);
document.getElementById('flipButton').addEventListener('click', function() {
flipped = !flipped;
if (flipped) {
text.set('scaleY', -1) ;
} else {
text.set('scaleY', -1) ;
}
canvas.renderAll();
});
</script>
</body>
</html>
Using FlipY Property
The flipY property in Fabric.js is a boolean property that defines the vertical flip state of an object. The flipY property changes the orientation of the text and is better when you want to flip the text without preserving its original size and proportions.
If flipY is set to true, the object will be flipped vertically. If it is set to false, the object will be in its normal state without any vertical flipping.
Syntax
Follow the syntax below to use the flipY property of Fabric.js to flip the text canvas vertically.
// on button click flipped = !flipped ; object.flipY = flipped ;
When the button is clicked, it will change the Boolean value of a flipped variable. Changed variable will be assigned to the flipY property, which will change the orientation.
Example
In the below example, we have created a simple UI with a canvas element and a button. Using fabric.js, we have created a text object and added it to the canvas. When the button is clicked, the code toggles the value of the flipY property on the text object, which changes the orientation of the text vertically. The updated canvas is then re-rendered to reflect the changes.
<html>
<head>
<script src ="https://cdnjs.cloudflare.com/ajax/libs/fabric.js/4.0.0-beta.12/fabric.min.js"> </script>
<style>
canvas {
border: 1px solid black;
}
</style>
</head>
<body>
<canvas id = "canvas" width = "200" height = "200"></canvas>
<button id = "flipButton" > Flip Text </button>
<script>
const canvas = new fabric.Canvas('canvas');
let flipped = false;
const text = new fabric.Text('Text to flip', {
left: 50,
top: 80,
fontSize: 24,
fill: 'red',
});
canvas.add(text);
document.getElementById('flipButton').addEventListener('click',
function() {
flipped = !flipped ;
text.flipY = flipped ;
canvas.renderAll() ;
});
</script>
</body>
</html>
We have learned to vertically flip a text canvas using the scaleY and flipY properties of Fabric.js. Both can be used to flip text vertically. However, it depends on the use case as to which one is better.
In general, it is better to use scaleY if you want to flip the text while preserving its original size and proportions and flipY if you want to flip the text without preserving its original size and proportions.
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