twedl/README.md

## README.md

      
    Raw
  

              README.md
            
          
    Visualize an Erdos-Renyi random graph, dynamically. (That is, the visualization is dynamic, not the graph.)
Some resources: Many examples from Mike Bostock and D3 Noob, and here.

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

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

.link {
  stroke: #000;
  stroke-opacity: 1;
}

</style>
<body>
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.6/d3.min.js" charset="utf-8"></script>
<script>

var nodes=[], //[{ "id": 0 }],
    links=[];

var width = 650,
    height = 550;

var N=100; // nodes.
var p=0.005; //Math.log(N)/N/2;  // probability of edge.

for (i = 0; i < N; i++) {
    nodes.push({"id": i});
}

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

var force = d3.layout.force()
    .nodes(nodes)
    .links(links)
    .charge(-50)
    .linkDistance(30)
    .size([width, height])
    .on("tick", tick);

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

link.data(links)
    .enter().append("line")
    .attr("class", "link");


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

function linkStart() {
    console.log(force.links().push({source: i, target: j}));
    link = link.data(force.links(), function(d) { return d.source.id + "-" + d.target.id; });
    link.enter().append("line").attr("class","link"); //.insert("line", ".node").attr("class", "link");
    link.exit().remove();
    force.start();
}

function nodeStart() {
    node = node.data(force.nodes(), function(d) { return d.id;});
    node.enter().append("circle").attr("class", function(d) {
        return "node" + d.id;
    }).attr("r", 5);
    node.exit().remove();

    force.start();

}

function tick() {
  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; });

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

var i=0,
    j=0;

function update() {
    if (i+1==N & j+1==N) {
        clearInterval(int);
    }
    if (j+1==N) {
        j=0;
        i++;
    }
    else {
        j++;
    }
    if (i!=j & Math.random() < p) {
        linkStart();
    }
}

nodeStart();
var int = setInterval(update, 0);

</script>
</body>

## thumbnail.png

      
    Raw
  

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

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

	.link {
	stroke: #000;
	stroke-opacity: 1;
	}

	</style>
	<body>
	<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.6/d3.min.js" charset="utf-8"></script>
	<script>

	var nodes=[], //[{ "id": 0 }],
	links=[];

	var width = 650,
	height = 550;

	var N=100; // nodes.
	var p=0.005; //Math.log(N)/N/2; // probability of edge.

	for (i = 0; i < N; i++) {
	nodes.push({"id": i});
	}

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

	var force = d3.layout.force()
	.nodes(nodes)
	.links(links)
	.charge(-50)
	.linkDistance(30)
	.size([width, height])
	.on("tick", tick);

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

	link.data(links)
	.enter().append("line")
	.attr("class", "link");


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

	function linkStart() {
	console.log(force.links().push({source: i, target: j}));
	link = link.data(force.links(), function(d) { return d.source.id + "-" + d.target.id; });
	link.enter().append("line").attr("class","link"); //.insert("line", ".node").attr("class", "link");
	link.exit().remove();
	force.start();
	}

	function nodeStart() {
	node = node.data(force.nodes(), function(d) { return d.id;});
	node.enter().append("circle").attr("class", function(d) {
	return "node" + d.id;
	}).attr("r", 5);
	node.exit().remove();

	force.start();

	}

	function tick() {
	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; });

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

	var i=0,
	j=0;

	function update() {
	if (i+1==N & j+1==N) {
	clearInterval(int);
	}
	if (j+1==N) {
	j=0;
	i++;
	}
	else {
	j++;
	}
	if (i!=j & Math.random() < p) {
	linkStart();
	}
	}

	nodeStart();
	var int = setInterval(update, 0);

	</script>
	</body>