Collision Detection

Mouseover to repel nodes. Adapted from my talk on force layouts. Compare to the canvas version.

forked from mbostock's block: Collision Detection

<!DOCTYPE html>
<meta charset="utf-8">
<style>
  circle {
    fill: #ff5a5f;
  }
</style>
  
<body>
<script src="//d3js.org/d3.v3.min.js"></script>
<script>

var width = 620,
    height = 500;

var nodes = d3.range(200).map(function() { return {radius: Math.random() * 12 + 4}; }),
    root = nodes[0],
    color = d3.scale.category10();

root.radius = 0;
root.fixed = true;

var force = d3.layout.force()
    .gravity(0.05)
    .charge(function(d, i) { return i ? 0 : -2000; })
    .nodes(nodes)
    .size([width, height]);

force.start();

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

var colors = ['#5bffb2', '#ffb4'];	
	var defs = svg.append("defs");
	var filter = defs.append("filter").attr("id","gooeyCodeFilter");
	filter.append("feGaussianBlur")
		.attr("in","SourceGraphic")
		.attr("stdDeviation","10")
		.attr("color-interpolation-filters","sRGB") 
		.attr("result","blur");
	filter.append("feColorMatrix")
		.attr("in","blur")
		.attr("mode","matrix")
		.attr("values","1 0 0 0 0  0 1 0 0 0  0 0 1 0 0  0 0 0 18 -7")
	
  
 var goo = svg.append("g").style("filter", "url(#gooeyCodeFilter)")
 
goo.selectAll("circle")
    .data(nodes.slice(1))
  .enter().append("circle")
    .attr("r", function(d) { return d.radius; })
    .style("fill", function(d, i) { return colors[i % colors.length]; });

force.on("tick", function(e) {
  var q = d3.geom.quadtree(nodes),
      i = 0,
      n = nodes.length;

while (++i < n) q.visit(collide(nodes[i]));

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

svg.on("mousemove", function() {
  var p1 = d3.mouse(this);
  root.px = p1[0];
  root.py = p1[1];
  force.resume();
});

</script>

https://d3js.org/d3.v3.min.js