larskotthoff/README.md

## README.md

      
    Raw
  

              README.md
            
          
    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.

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

.link {
  stroke: #000;
  stroke-width: 1.5px;
}

.node {
  fill: #000;
  stroke: #fff;
  stroke-width: 1.5px;
}

.node.a { fill: #1f77b4; }
.node.b { fill: #ff7f0e; }
.node.c { fill: #2ca02c; }

</style>
<body>
<script src="http://d3js.org/d3.v3.min.js"></script>
<script>

var width = 960,
    height = 500;

var color = d3.scale.category10();

var nodes = [],
    links = [];

var force = d3.layout.force()
    .nodes(nodes)
    .links(links)
    .charge(-400)
    .linkDistance(120)
    .size([width, height])
    .on("tick", tick);

var svg = d3.select("body").append("svg")
    .attr("width", width)
    .attr("height", height);

var node = svg.selectAll(".node"),
    link = svg.selectAll(".link");

// 1. Add three nodes and three links.
setTimeout(function() {
  var a = {id: "a"}, b = {id: "b"}, c = {id: "c"};
  force.stop();
  nodes.push(a, b, c);
  links.push({source: 0, target: 1}, {source: 0, target: 2}, {source: 1, target: 2});
  start();
}, 0);

// 2. Remove node B and associated links.
setTimeout(function() {
  nodes.splice(1, 1); // remove b
  links.shift(); // remove a-b
  links.pop(); // remove b-c
  start();
}, 3000);

// Add node B back.
setTimeout(function() {
  var a = nodes[0], b = {id: "b"}, c = nodes[1];
  nodes.push(b);
  links.push({source: a, target: b}, {source: b, target: c});
  start();
}, 6000);

function start() {
  force.start();

  link = link.data(force.links(), function(d) { return d.source.id + "-" + d.target.id; });
  link.enter().insert("line", ".node").attr("class", "link");
  link.exit().remove();

  node = node.data(force.nodes(), function(d) { return d.id;});
  node.enter().append("circle").attr("class", function(d) { return "node " + d.id; }).attr("r", 8);
  node.exit().remove();
}

function tick() {
  node.attr("cx", function(d) { return d.x; })
      .attr("cy", function(d) { return d.y; })

  link.attr("x1", function(d) { return d.source.x; })
      .attr("y1", function(d) { return d.source.y; })
      .attr("x2", function(d) { return d.target.x; })
      .attr("y2", function(d) { return d.target.y; });
}

</script>

## thumbnail.png

      
    Raw
  

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

	.link {
	stroke: #000;
	stroke-width: 1.5px;
	}

	.node {
	fill: #000;
	stroke: #fff;
	stroke-width: 1.5px;
	}

	.node.a { fill: #1f77b4; }
	.node.b { fill: #ff7f0e; }
	.node.c { fill: #2ca02c; }

	</style>
	<body>
	<script src="http://d3js.org/d3.v3.min.js"></script>
	<script>

	var width = 960,
	height = 500;

	var color = d3.scale.category10();

	var nodes = [],
	links = [];

	var force = d3.layout.force()
	.nodes(nodes)
	.links(links)
	.charge(-400)
	.linkDistance(120)
	.size([width, height])
	.on("tick", tick);

	var svg = d3.select("body").append("svg")
	.attr("width", width)
	.attr("height", height);

	var node = svg.selectAll(".node"),
	link = svg.selectAll(".link");

	// 1. Add three nodes and three links.
	setTimeout(function() {
	var a = {id: "a"}, b = {id: "b"}, c = {id: "c"};
	force.stop();
	nodes.push(a, b, c);
	links.push({source: 0, target: 1}, {source: 0, target: 2}, {source: 1, target: 2});
	start();
	}, 0);

	// 2. Remove node B and associated links.
	setTimeout(function() {
	nodes.splice(1, 1); // remove b
	links.shift(); // remove a-b
	links.pop(); // remove b-c
	start();
	}, 3000);

	// Add node B back.
	setTimeout(function() {
	var a = nodes[0], b = {id: "b"}, c = nodes[1];
	nodes.push(b);
	links.push({source: a, target: b}, {source: b, target: c});
	start();
	}, 6000);

	function start() {
	force.start();

	link = link.data(force.links(), function(d) { return d.source.id + "-" + d.target.id; });
	link.enter().insert("line", ".node").attr("class", "link");
	link.exit().remove();

	node = node.data(force.nodes(), function(d) { return d.id;});
	node.enter().append("circle").attr("class", function(d) { return "node " + d.id; }).attr("r", 8);
	node.exit().remove();
	}

	function tick() {
	node.attr("cx", function(d) { return d.x; })
	.attr("cy", function(d) { return d.y; })

	link.attr("x1", function(d) { return d.source.x; })
	.attr("y1", function(d) { return d.source.y; })
	.attr("x2", function(d) { return d.target.x; })
	.attr("y2", function(d) { return d.target.y; });
	}

	</script>