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How to implement copy paste programmatically using FabricJS?
We can create a Polygon object by creating an instance of fabric.Polygon. A polygon object can be characterized by any closed shape consisting of a set of connected straight line segments. Since it is one of the basic elements of FabricJS, we can also easily customize it by applying properties like angle, opacity etc. In order to implement copy paste programmatically, we need to use the clone method.
Syntax
clone( callback: Object, propertiesToInclude: Array)
Parameters
Callback (optional)− This parameter is a callback function which is invoked with a clone.
propertiesToInclude (optional) − This parameter includes any additional properties that we want to be included in the clone canvas instance. This must be in the form of an Array.
Example 1: Implementing Copy Paste Programmatically on Polygon
Let’s see a code example to understand how we can attain copy paste programmatically on a Polygon. We need to clone what we are copying and add it to the clipboard so that we can paste it later on. In order to do that, we have used the clone method in the Copy() function which is going to clone the actively selected object and save it to the clipboard. Further we have created a Paste() function which is going to add that cloned object to our canvas using canvas.add, which in this case is a polygon.
<!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>Implementing copy paste programmatically on Polygon</h2>
<p>
You can select the object, click on copy and then click on paste button to see object duplication in action
</p>
<button onclick="Copy()" style="padding: 3px">copy</button>
<button onclick="Paste()" style="padding: 3px">paste</button>
<canvas id="canvas"></canvas>
<script>
// Initiate a canvas instance
var canvas = new fabric.Canvas("canvas");
canvas.setWidth(document.body.scrollWidth);
canvas.setHeight(250);
// Initiating Copy function which copies
// the object to clipboard
function Copy() {
canvas.getActiveObject().clone(function (cloned) {
_clipboard = cloned;
});
}
// Initiating Paste function which pastes
// the object to canvas, adds offset and
// makes the object active
function Paste() {
_clipboard.clone(function (clonedObj) {
canvas.discardActiveObject();
clonedObj.set({
left: clonedObj.left + 10,
top: clonedObj.top + 10,
evented: true,
});
canvas.add(clonedObj);
clipboard.top += 10;
_clipboard.left += 10;
canvas.setActiveObject(clonedObj);
canvas.requestRenderAll();
});
}
// Initiating a points array
var points = [
{ x: 30, y: 50 },
{ x: 70, y: 50 },
{ x: 0, y: 0 },
{ x: 70, y: 0 },
];
// Initiating a polygon object
var polygon = new fabric.Polygon(points, {
left: 100,
top: 40,
fill: "#1e90ff",
strokeWidth: 4,
stroke: "green",
scaleX: 2,
scaleY: 2,
});
// Adding it to the canvas
canvas.add(polygon);
</script>
</body>
</html>
Example 2: Implementing Copy Paste Programmatically on Circle
Let’s see a code example to understand how we can implement copy paste programmatically using FabricJS on a circle. In this case, we have initiated a circle of radius 40 instead of a polygon object and added it to the canvas. Similarly, the Copy() and Paste() functions can be used on various objects apart from Polygon.
<!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>Implementing copy paste programmatically on Circle</h2>
<p>
You can select the object, click on copy and then click on paste button to see object duplication in action
</p>
<button onclick="Copy()" style="padding: 3px">copy</button>
<button onclick="Paste()" style="padding: 3px">paste</button>
<canvas id="canvas"></canvas>
<script>
// Initiate a canvas instance
var canvas = new fabric.Canvas("canvas");
canvas.setWidth(document.body.scrollWidth);
canvas.setHeight(250);
// Initiating Copy function which copies
// the object to clipboard
function Copy() {
canvas.getActiveObject().clone(function (cloned) {
_clipboard = cloned;
});
}
// Initiating Paste function which pastes
// the object to canvas, adds offset and
// makes the object active
function Paste() {
_clipboard.clone(function (clonedObj) {
canvas.discardActiveObject();
clonedObj.set({
left: clonedObj.left + 10,
top: clonedObj.top + 10,
evented: true,
});
canvas.add(clonedObj);
_clipboard.top += 10;
_clipboard.left += 10;
canvas.setActiveObject(clonedObj);
canvas.requestRenderAll();
});
}
// Initiating a circle object
var circle = new fabric.Circle({
left: 100,
top: 40,
fill: "#1e90ff",
radius: 40,
strokeWidth: 4,
stroke: "green",
scaleX: 2,
scaleY: 2,
});
// Adding it to the canvas
canvas.add(circle);
</script>
</body>
</html>
Conclusion
In this tutorial, we used two examples to demonstrate how you can implement copy-paste programmatically using FabricJS.
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