ericsoco/README.md

## README.md

      
    Raw
  

              README.md
            
          
    Example illustrating the use of both d3-force-attract and  d3-force-cluster.

  
## index.html
<!DOCTYPE html>
<html>
  <head>
    <title>d3-force-cluster and d3-force-attract</title>
  </head>

  <body>
    <script src="https://d3js.org/d3.v4.min.js"></script>
    <script src="https://unpkg.com/d3-force-attract@latest"></script>
    <script src="https://unpkg.com/d3-force-cluster@latest"></script>
    <script>

var width = 960,
    height = 500,
    padding = 1.5, // separation between same-color nodes
    clusterPadding = 6, // separation between different-color nodes
    maxRadius = 12;


var n = 200, // total number of nodes
    m = 10; // number of distinct clusters

var color = d3.scaleSequential(d3.interpolateRainbow)
    .domain(d3.range(m));

// The largest node for each cluster.
var clusters = new Array(m);

var nodes = d3.range(n).map(function () {
  var i = Math.floor(Math.random() * m),
      r = Math.sqrt((i + 1) / m * -Math.log(Math.random())) * maxRadius,
      d = {
        cluster: i,
        radius: r,
        x: Math.cos(i / m * 2 * Math.PI) * 200 + width / 2 + Math.random(),
        y: Math.sin(i / m * 2 * Math.PI) * 200 + height / 2 + Math.random()
      };
  if (!clusters[i] || (r > clusters[i].radius)) clusters[i] = d;
  return d;
});

var simulation = d3.forceSimulation()
  // keep entire simulation balanced around screen center
  .force('center', d3.forceCenter(width/2, height/2))

  // pull toward center
  .force('attract', d3.forceAttract()
    .target([width/2, height/2])
    .strength(0.01))

  // cluster by section
  .force('cluster', d3.forceCluster()
    .centers(function (d) { return clusters[d.cluster]; })
    .strength(0.5)
    .centerInertia(0.1))

  // apply collision with padding
  .force('collide', d3.forceCollide(function (d) { return d.radius + padding; })
    .strength(0))

  .on('tick', layoutTick)
  .nodes(nodes);

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

var node = svg.selectAll('circle')
  .data(nodes)
  .enter().append('circle')
    .style('fill', function (d) { return color(d.cluster/10); })
    .call(d3.drag()
      .on('start', dragstarted)
      .on('drag', dragged)
      .on('end', dragended)
    );

function dragstarted (d) {
  if (!d3.event.active) simulation.alphaTarget(0.3).restart();
  d.fx = d.x;
  d.fy = d.y;
}

function dragged (d) {
  d.fx = d3.event.x;
  d.fy = d3.event.y;
}

function dragended (d) {
  if (!d3.event.active) simulation.alphaTarget(0);
  d.fx = null;
  d.fy = null;
}

// ramp up collision strength to provide smooth transition
var transitionTime = 3000;
var t = d3.timer(function (elapsed) {
  var dt = elapsed / transitionTime;
  simulation.force('collide').strength(Math.pow(dt, 2) * 0.7);
  if (dt >= 1.0) t.stop();
});

function layoutTick (e) {
  node
    .attr('cx', function (d) { return d.x; })
    .attr('cy', function (d) { return d.y; })
    .attr('r', function (d) { return d.radius; });
}

    </script>
  </body>
</html>

## preview.jpg

      
    Raw
  

              preview.jpg
            
          
## thumbnail.png

      
    Raw
  

              thumbnail.png
	<!DOCTYPE html>
	<html>
	<head>
	<title>d3-force-cluster and d3-force-attract</title>
	</head>

	<body>
	<script src="https://d3js.org/d3.v4.min.js"></script>
	<script src="https://unpkg.com/d3-force-attract@latest"></script>
	<script src="https://unpkg.com/d3-force-cluster@latest"></script>
	<script>

	var width = 960,
	height = 500,
	padding = 1.5, // separation between same-color nodes
	clusterPadding = 6, // separation between different-color nodes
	maxRadius = 12;


	var n = 200, // total number of nodes
	m = 10; // number of distinct clusters

	var color = d3.scaleSequential(d3.interpolateRainbow)
	.domain(d3.range(m));

	// The largest node for each cluster.
	var clusters = new Array(m);

	var nodes = d3.range(n).map(function () {
	var i = Math.floor(Math.random() * m),
	r = Math.sqrt((i + 1) / m * -Math.log(Math.random())) * maxRadius,
	d = {
	cluster: i,
	radius: r,
	x: Math.cos(i / m * 2 * Math.PI) * 200 + width / 2 + Math.random(),
	y: Math.sin(i / m * 2 * Math.PI) * 200 + height / 2 + Math.random()
	};
	if (!clusters[i] \|\| (r > clusters[i].radius)) clusters[i] = d;
	return d;
	});

	var simulation = d3.forceSimulation()
	// keep entire simulation balanced around screen center
	.force('center', d3.forceCenter(width/2, height/2))

	// pull toward center
	.force('attract', d3.forceAttract()
	.target([width/2, height/2])
	.strength(0.01))

	// cluster by section
	.force('cluster', d3.forceCluster()
	.centers(function (d) { return clusters[d.cluster]; })
	.strength(0.5)
	.centerInertia(0.1))

	// apply collision with padding
	.force('collide', d3.forceCollide(function (d) { return d.radius + padding; })
	.strength(0))

	.on('tick', layoutTick)
	.nodes(nodes);

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

	var node = svg.selectAll('circle')
	.data(nodes)
	.enter().append('circle')
	.style('fill', function (d) { return color(d.cluster/10); })
	.call(d3.drag()
	.on('start', dragstarted)
	.on('drag', dragged)
	.on('end', dragended)
	);

	function dragstarted (d) {
	if (!d3.event.active) simulation.alphaTarget(0.3).restart();
	d.fx = d.x;
	d.fy = d.y;
	}

	function dragged (d) {
	d.fx = d3.event.x;
	d.fy = d3.event.y;
	}

	function dragended (d) {
	if (!d3.event.active) simulation.alphaTarget(0);
	d.fx = null;
	d.fy = null;
	}

	// ramp up collision strength to provide smooth transition
	var transitionTime = 3000;
	var t = d3.timer(function (elapsed) {
	var dt = elapsed / transitionTime;
	simulation.force('collide').strength(Math.pow(dt, 2) * 0.7);
	if (dt >= 1.0) t.stop();
	});

	function layoutTick (e) {
	node
	.attr('cx', function (d) { return d.x; })
	.attr('cy', function (d) { return d.y; })
	.attr('r', function (d) { return d.radius; });
	}

	</script>
	</body>
	</html>