newsummit/.block

## .block
license: mit

## README.md

      
    Raw
  

              README.md
            
          
    This variation of a clustered force layout uses D3’s circle-packing layout to initialize node positions.
forked from mbostock's block: Cluster Force Layout IV

  
## index.html
<!DOCTYPE html>
<meta charset="utf-8">
<body>
<script src="https://d3js.org/d3.v3.min.js"></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.scale.category10()
    .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};
  if (!clusters[i] || (r > clusters[i].radius)) clusters[i] = d;
  return d;
});

// Use the pack layout to initialize node positions.
d3.layout.pack()
    .sort(null)
    .size([width, height])
    .children(function(d) { return d.values; })
    .value(function(d) { return d.radius * d.radius; })
    .nodes({values: d3.nest()
      .key(function(d) { return d.cluster; })
      .entries(nodes)});

var force = d3.layout.force()
    .nodes(nodes)
    .size([width, height])
    .gravity(.02)
    .charge(0)
    .on("tick", tick)
    .start();

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); })
    .call(force.drag);

node.transition()
    .duration(750)
    .delay(function(d, i) { return i * 5; })
    .attrTween("r", function(d) {
      var i = d3.interpolate(0, d.radius);
      return function(t) { return d.radius = i(t); };
    });

function tick(e) {
  node
      .each(cluster(10 * e.alpha * e.alpha))
      .each(collide(.5))
      .attr("cx", function(d) { return d.x; })
      .attr("cy", function(d) { return d.y; });
}

// Move d to be adjacent to the cluster node.
function cluster(alpha) {
  return function(d) {
    var cluster = clusters[d.cluster];
    if (cluster === d) return;
    var x = d.x - cluster.x,
        y = d.y - cluster.y,
        l = Math.sqrt(x * x + y * y),
        r = d.radius + cluster.radius;
    if (l != r) {
      l = (l - r) / l * alpha;
      d.x -= x *= l;
      d.y -= y *= l;
      cluster.x += x;
      cluster.y += y;
    }
  };
}

// Resolves collisions between d and all other circles.
function collide(alpha) {
  var quadtree = d3.geom.quadtree(nodes);
  return function(d) {
    var r = d.radius + maxRadius + Math.max(padding, clusterPadding),
        nx1 = d.x - r,
        nx2 = d.x + r,
        ny1 = d.y - r,
        ny2 = d.y + r;
    quadtree.visit(function(quad, x1, y1, x2, y2) {
      if (quad.point && (quad.point !== d)) {
        var x = d.x - quad.point.x,
            y = d.y - quad.point.y,
            l = Math.sqrt(x * x + y * y),
            r = d.radius + quad.point.radius + (d.cluster === quad.point.cluster ? padding : clusterPadding);
        if (l < r) {
          l = (l - r) / l * alpha;
          d.x -= x *= l;
          d.y -= y *= l;
          quad.point.x += x;
          quad.point.y += y;
        }
      }
      return x1 > nx2 || x2 < nx1 || y1 > ny2 || y2 < ny1;
    });
  };
}

</script>
	<!DOCTYPE html>
	<meta charset="utf-8">
	<body>
	<script src="https://d3js.org/d3.v3.min.js"></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.scale.category10()
	.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};
	if (!clusters[i] \|\| (r > clusters[i].radius)) clusters[i] = d;
	return d;
	});

	// Use the pack layout to initialize node positions.
	d3.layout.pack()
	.sort(null)
	.size([width, height])
	.children(function(d) { return d.values; })
	.value(function(d) { return d.radius * d.radius; })
	.nodes({values: d3.nest()
	.key(function(d) { return d.cluster; })
	.entries(nodes)});

	var force = d3.layout.force()
	.nodes(nodes)
	.size([width, height])
	.gravity(.02)
	.charge(0)
	.on("tick", tick)
	.start();

	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); })
	.call(force.drag);

	node.transition()
	.duration(750)
	.delay(function(d, i) { return i * 5; })
	.attrTween("r", function(d) {
	var i = d3.interpolate(0, d.radius);
	return function(t) { return d.radius = i(t); };
	});

	function tick(e) {
	node
	.each(cluster(10 * e.alpha * e.alpha))
	.each(collide(.5))
	.attr("cx", function(d) { return d.x; })
	.attr("cy", function(d) { return d.y; });
	}

	// Move d to be adjacent to the cluster node.
	function cluster(alpha) {
	return function(d) {
	var cluster = clusters[d.cluster];
	if (cluster === d) return;
	var x = d.x - cluster.x,
	y = d.y - cluster.y,
	l = Math.sqrt(x * x + y * y),
	r = d.radius + cluster.radius;
	if (l != r) {
	l = (l - r) / l * alpha;
	d.x -= x *= l;
	d.y -= y *= l;
	cluster.x += x;
	cluster.y += y;
	}
	};
	}

	// Resolves collisions between d and all other circles.
	function collide(alpha) {
	var quadtree = d3.geom.quadtree(nodes);
	return function(d) {
	var r = d.radius + maxRadius + Math.max(padding, clusterPadding),
	nx1 = d.x - r,
	nx2 = d.x + r,
	ny1 = d.y - r,
	ny2 = d.y + r;
	quadtree.visit(function(quad, x1, y1, x2, y2) {
	if (quad.point && (quad.point !== d)) {
	var x = d.x - quad.point.x,
	y = d.y - quad.point.y,
	l = Math.sqrt(x * x + y * y),
	r = d.radius + quad.point.radius + (d.cluster === quad.point.cluster ? padding : clusterPadding);
	if (l < r) {
	l = (l - r) / l * alpha;
	d.x -= x *= l;
	d.y -= y *= l;
	quad.point.x += x;
	quad.point.y += y;
	}
	}
	return x1 > nx2 \|\| x2 < nx1 \|\| y1 > ny2 \|\| y2 < ny1;
	});
	};
	}

	</script>
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