How to crop the height of a cloned image using FabricJS?
In this tutorial we will learn how to crop height from a cloned image using the following method FabricJS. We can create an Image object by creating an instance of fabric.Image. since It is one of the basic elements of FabricJS and we can also customize it easily through the application Angle, opacity and other properties. To crop the height in the cloned image, we use HeightAttribute.
grammar
cloneAsImage( callback: function, { height: Number}: Object): fabric.Object
parameter
Callback (optional) - This parameter is a function that will use the cloned image instance as the first call argument.
Options (optional) - This parameter is an optional object that provides additional customization to our cloned image . Using this parameter we can set the multiplier, crop the cloned image, remove the current object transform or can change many other properties, where height is a property.
Option key
##height - This property accepts a Number value, indicating cropping high. This attribute is optional.
heightproperty
ExampleLet's look at a code example to see how a cloned Image object displays when
height Property is not used. In this case, the cloned image will not be cropped.
<!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>Without using the height property</h2>
<p>You can see that no cropping has been applied to the clone image</p>
<canvas id="canvas"></canvas>
<img src="https://www.tutorialspoint.com/images/logo.png" id="img1" style="display: none" />
<script>
// Initiate a canvas instance
var canvas = new fabric.Canvas("canvas");
canvas.setWidth(document.body.scrollWidth);
canvas.setHeight(250);
// Initiating the image element
var imageElement = document.getElementById("img1");
// Initiate a shadow object
var shadow = new fabric.Shadow({
color: "#308080",
blur: 3,
});
// Initiate an Image object
var image = new fabric.Image(imageElement, {
top: 50,
left: 110,
skewX: 20,
shadow: shadow,
});
// Using cloneAsImage method
image.cloneAsImage(function(Img) {
Img.set("top", 150);
Img.set("left", 150);
canvas.add(Img);
});
</script>
</body>
</html>
HeightProperties
ExampleIn this example, we used the
height property and passed it the value 50, which is Crop Height. Therefore, the height will be clipped.
<!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>Using the height property</h2>
<p>You can see that cropping has been applied to the clone image</p>
<canvas id="canvas"></canvas>
<img src="https://www.tutorialspoint.com/images/logo.png" id="img1" style="display: none" />
<script>
// Initiate a canvas instance
var canvas = new fabric.Canvas("canvas");
canvas.setWidth(document.body.scrollWidth);
canvas.setHeight(250);
// Initiating the image element
var imageElement = document.getElementById("img1");
// Initiate a shadow object
var shadow = new fabric.Shadow({
color: "#308080",
blur: 3,
});
// Initiate an Image object
var image = new fabric.Image(imageElement, {
top: 50,
left: 110,
skewX: 20,
shadow: shadow,
});
// Using cloneAsImage method
image.cloneAsImage(
function(Img) {
Img.set("top", 150);
Img.set("left", 150);
canvas.add(Img);
}, {
height: 50,
}
);
</script>
</body>
</html>
In this tutorial, we use two examples to demonstrate how to crop the height in a clone Generate images using FabricJS.
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