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How to create an object representation of an image object using FabricJS?
How to create an object representation of an image object using FabricJS?
In this tutorial we will learn how to create an object representation of an image Objects using FabricJS. We can create an Image object by creating an instance fabric.image. Since it is one of the basic elements of FabricJS, we can also easily Customize it by applying properties such as angle, opacity, and more. To create an object To represent an Image object, we use the toObject method.
grammar
toObject(propertiesToInclude: Array): Object
parameter
propertiesToInclude - This parameter accepts an Array containing any Additional attributes we may wish to include in the output. This parameter is Optional.
Use toObjectmethod
Example
Let's look at a code example to see the output logged when using the toObject method. In this case, an object representation of the Image instance is returned.
<!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 toObject method</h2>
<p>
You can open console from dev tools and see that the logged output contains the Object representation of the image instance
</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 an Image object
var image = new fabric.Image(imageElement, {
top: 50,
left: 110,
});
// Add it to the canvas
canvas.add(image);
// Using the toObject method
console.log(
"Object representation of the Image instance is: ",
image.toObject()
);
</script>
</body>
</html>
Add additional properties using the toObject method
Example
Let’s look at a code example to see how to use toObject method. In this example, we added a custom property called "property name". We can pass specific properties to the fabric.Image instance as shown below second argument in the options object and pass the same key to the toObject method.
<!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 toObject method to add additional properties</h2>
<p>
You can open console from dev tools and see that the logged output contains added property called PropertyName
</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 an Image object with PropertyName key
// passed in options object
var image = new fabric.Image(imageElement, {
top: 50,
left: 110,
PropertyName: "property",
});
// Add it to the canvas
canvas.add(image);
// Using the toObject method
console.log(
"Object representation of the Image instance is: ",
image.toObject(["PropertyName"])
);
</script>
</body>
</html>
in conclusion
In this tutorial, we use two examples to demonstrate how to create objects Use FabricJS to represent images.
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