FabricJS - Programmatically implement object copying on polygons?
We can create a Polygon object by creating an instance of fabric.Polygon. A polygon object can be characterized as 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 such as angle, opacity, etc. In order to implement object copying programmatically, we need to use the clone method to implement duplication control
grammar
clone( callback: Object, propertiesToInclude: Array)
parameter
Callback (optional) - This parameter is the callback function called through the clone.
propertiesToInclude (optional) - This parameter includes any additional properties we wish to include in the cloned canvas instance. This must be in the form of an array.
Example 1: Programmatic object copying on Polygon
Let's look at a code example to understand how to implement object copying on polygons. First, we start a polygon object and its respective point array and add it to the clipboard. We also have a button that when clicked triggers the duplicate() function. duplicate() will get the object from the clipboard and clone the copied object using the offset and add it to the canvas using canvas.add.
<!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 object duplication programmatically on Polygon</h2>
<p>
You can click on Duplicate button to see object duplication in action
</p>
<button onclick="duplicate()" style="padding: 3px">Duplicate</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 duplicate() function which pastes
// the object to canvas, adds offset and
// makes the object active
function duplicate() {
_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,
});
// Clone the object to clipboard
polygon.clone(function (cloned) {
_clipboard = cloned;
});
// Adding it to the canvas
canvas.add(polygon);
</script>
</body>
</html>
Example 2: Programmatic object copying on a Circle
Let’s look at a code example to see how to programmatically implement object copying on a circle using FabricJS. In this case we started with a circle instead of a polygon object and followed the same process. Therefore, a copy of the circle will be created.
<!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 object duplication programmatically on Circle</h2>
<p>
You can click on Duplicate button to see object duplication in action
</p>
<button onclick="duplicate()" style="padding: 3px">Duplicate</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 duplicate() function which pastes
// the object to canvas, adds offset and
// makes the object active
function duplicate() {
_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,
});
// Clone the object to clipboard
circle.clone(function (cloned) {
_clipboard = cloned;
});
// Adding it to the canvas
canvas.add(circle);
</script>
</body>
</html>
in conclusion
In this tutorial, we use two simple examples to demonstrate how to programmatically implement object copying using FabricJS.
The above is the detailed content of FabricJS - Programmatically implement object copying on polygons?. For more information, please follow other related articles on the PHP Chinese website!
Hot AI Tools
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Undress AI Tool
Undress images for free
Clothoff.io
AI clothes remover
AI Hentai Generator
Generate AI Hentai for free.
Hot Article
Hot Tools
Notepad++7.3.1
Easy-to-use and free code editor
SublimeText3 Chinese version
Chinese version, very easy to use
Zend Studio 13.0.1
Powerful PHP integrated development environment
Dreamweaver CS6
Visual web development tools
SublimeText3 Mac version
God-level code editing software (SublimeText3)
Hot Topics
Replace String Characters in JavaScript
Mar 11, 2025 am 12:07 AM
Detailed explanation of JavaScript string replacement method and FAQ This article will explore two ways to replace string characters in JavaScript: internal JavaScript code and internal HTML for web pages. Replace string inside JavaScript code The most direct way is to use the replace() method: str = str.replace("find","replace"); This method replaces only the first match. To replace all matches, use a regular expression and add the global flag g: str = str.replace(/fi
8 Stunning jQuery Page Layout Plugins
Mar 06, 2025 am 12:48 AM
Leverage jQuery for Effortless Web Page Layouts: 8 Essential Plugins jQuery simplifies web page layout significantly. This article highlights eight powerful jQuery plugins that streamline the process, particularly useful for manual website creation
Build Your Own AJAX Web Applications
Mar 09, 2025 am 12:11 AM
So here you are, ready to learn all about this thing called AJAX. But, what exactly is it? The term AJAX refers to a loose grouping of technologies that are used to create dynamic, interactive web content. The term AJAX, originally coined by Jesse J
10 Mobile Cheat Sheets for Mobile Development
Mar 05, 2025 am 12:43 AM
This post compiles helpful cheat sheets, reference guides, quick recipes, and code snippets for Android, Blackberry, and iPhone app development. No developer should be without them! Touch Gesture Reference Guide (PDF) A valuable resource for desig
Improve Your jQuery Knowledge with the Source Viewer
Mar 05, 2025 am 12:54 AM
jQuery is a great JavaScript framework. However, as with any library, sometimes it’s necessary to get under the hood to discover what’s going on. Perhaps it’s because you’re tracing a bug or are just curious about how jQuery achieves a particular UI
10 jQuery Fun and Games Plugins
Mar 08, 2025 am 12:42 AM
10 fun jQuery game plugins to make your website more attractive and enhance user stickiness! While Flash is still the best software for developing casual web games, jQuery can also create surprising effects, and while not comparable to pure action Flash games, in some cases you can also have unexpected fun in your browser. jQuery tic toe game The "Hello world" of game programming now has a jQuery version. Source code jQuery Crazy Word Composition Game This is a fill-in-the-blank game, and it can produce some weird results due to not knowing the context of the word. Source code jQuery mine sweeping game
How do I create and publish my own JavaScript libraries?
Mar 18, 2025 pm 03:12 PM
Article discusses creating, publishing, and maintaining JavaScript libraries, focusing on planning, development, testing, documentation, and promotion strategies.
jQuery Parallax Tutorial - Animated Header Background
Mar 08, 2025 am 12:39 AM
This tutorial demonstrates how to create a captivating parallax background effect using jQuery. We'll build a header banner with layered images that create a stunning visual depth. The updated plugin works with jQuery 1.6.4 and later. Download the
