Fabian Morón Zirfas ff6347

This example demonstrates how to add and remove nodes and links from a force layout. The graph initially appears with three nodes A, B and C connected in a loop. Three seconds later, node B is removed, along with the links B-A and B-C. At six seconds, node B is reintroduced, restoring the original links B-A and B-C. This example uses the general update pattern for data joins.

Click to add nodes! Nodes near the cursor will be linked to the new node.

D3's force layout uses the Barnes–Hut approximation to compute repulsive charge forces between all nodes efficiently. Links are implemented as geometric constraints on top of position Verlet integration, offering greater stability. A virtual spring between each node and the center of the chart prevents nodes from drifting into space.

This example builds a random tree using the Reingold-Tilford "tidy" algorithm, as described in "Tidier Drawings of Trees" and implemented by d3.layout.tree. As each node is added to the graph, it enters from the previous position of the parent node. Thus, the existing nodes and the new node transition smoothly to their new positions. The animation stops when 500 nodes have been added to the tree.

This example demonstrates the general update pattern in D3, where a data-join is followed by operations on the enter, update and exit selections. Entering elements are shown in green, while updating elements are shown in black. Exiting elements are removed immediately, so they're invisible.

This example does not use a key function for the data-join, so entering elements are always added to the end: when the new data has more letters than the old data, new elements are entered to display the new letters. Likewise, exiting letters are always removed from the end when the new data has fewer letters than the old data.

Next: Key Functions

This example demonstrates how to add and remove nodes and links from a force layout. The graph initially appears with three nodes A, B and C connected in a loop. Three seconds later, node B is removed, along with the links B-A and B-C. At six seconds, node B is reintroduced, restoring the original links B-A and B-C. This example uses the general update pattern for data joins.

	<!DOCTYPE html>
	<meta charset="utf-8">
	<title>Force-Directed Graph</title>
	<style>

	.node {
	cursor: pointer;
	stroke: #3182bd;
	stroke-width: 1.5px;
	}

	<!DOCTYPE html>
	<meta charset="utf-8">
	<style>

	circle {
	stroke: #fff;
	}

	</style>
	<body>

	<!DOCTYPE html>
	<html>
	<head>
	<script type="text/javascript" src="http://mbostock.github.com/d3/d3.js?2.1.3"></script>
	<script type="text/javascript" src="http://mbostock.github.com/d3/d3.geom.js?2.1.3"></script>
	<script type="text/javascript" src="http://mbostock.github.com/d3/d3.layout.js?2.1.3"></script>
	<style type="text/css">
	.link {
	stroke: #ccc;
	}

	#!/usr/bin/ruby

	input = STDIN.read

	subs = {
	" " => " ",
	"a" => "ɐ",
	"b" => "q",
	"c" => "ɔ",
	"d" => "p",

	/*
	* object.watch polyfill
	*
	* 2012-04-03
	*
	* By Eli Grey, http://eligrey.com
	* Public Domain.
	* NO WARRANTY EXPRESSED OR IMPLIED. USE AT YOUR OWN RISK.
	*/