D3 Examples - Clustering Last.fm Users

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<!DOCTYPE html>
<meta charset="utf-8">
<style>
​
.node {
  cursor: pointer;
}
​
.node:hover {
  stroke: #000;
  stroke-width: 3.6px;
}
​
.node--leaf {
  fill: white;
}
​
.label {
  font-family: "Maven Pro";
  font-size: 12px;
  text-anchor: middle;
}
​
.label,
.node--root,
.node--leaf {
  pointer-events: none;
}
​
</style>
<svg width="500" height="500"></svg>
<script src="https://d3js.org/d3.v4.min.js"></script>
<script>
​
var svg = d3.select("svg"),
    margin = 20,
    diameter = +svg.attr("width"),
    g = svg.append("g").attr("transform", "translate(" + diameter / 2 + "," + diameter / 2 + ")");
​
var color = d3.scaleLinear()
    .domain([-1, 5])
    .range(["hsl(152,80%,100%)", "hsl(228,30%,40%)"])
    .interpolate(d3.interpolateHcl);
​
var pack = d3.pack()
    .size([diameter - margin, diameter - margin])
    .padding(2);
​
d3.json("clustered-users-26-20000-americans.json", function(error, root){
      if (error) throw error;
​
      root = d3.hierarchy(root)
          .sum(function(d) { return d.size; })
          .sort(function(a, b) {
            return b.value - a.value;
        });
​
      var focus = root,
          nodes = pack(root).descendants(),
          view;
    
    // Circlular nodes
      var circle = g.selectAll("circle")
        .data(nodes)
        .enter()
        .append("circle")
          .attr("class", function(d) {
            return d.parent ? d.children ? "node" : "node node--leaf" : "node node--root";
          })
          .style("fill", function(d) {
            return d.children ? color(d.depth) : null;
          })
          .on("click", function(d) {
            if (focus !== d)
                zoom(d),
                d3.event.stopPropagation();
          });
    
    // Add text labels to each node
      var text = g.selectAll("text")
        .data(nodes)
        .enter().append("text")
          .attr("class", "label")
          .style("fill-opacity", function(d) {
              return d.parent === root ? 1 : 0;
          })
          .style("display", function(d) {
              // if the node is internal, then have no text
              return d.parent === root ? "inline" : "none";
          })
          .text(function(d) {
              return d.data.name;
          });
​
      var node = g.selectAll("circle,text");
​
      svg.style("background", color(-1))
          .on("click", function() { zoom(root); });
​
      zoomTo([root.x, root.y, root.r * 2 + margin]);
        
        
      function zoomTo(v) {
        var k = diameter / v[2];
        view = v;
        node.attr("transform", function(d) {
          return "translate(" + (d.x - v[0]) * k + "," + (d.y - v[1]) * k + ")";
        });
        circle.attr("r", function(d) { return d.r * k; });
      }
​
      function zoom(d) {
        var focus0 = focus; focus = d;
​
        var transition = d3.transition()
            .duration(d3.event.altKey ? 7500 : 750)
            .tween("zoom", function(d) {
              var i = d3.interpolateZoom(view, [focus.x, focus.y, focus.r * 2 + margin]);
              return function(t) { zoomTo(i(t)); };
            });
​
        transition.selectAll("text")
          .filter(function(d) {
            return d.parent === focus || this.style.display === "inline";
            })
            .style("fill-opacity", function(d) {
                return d.parent === focus ? 1 : 0;
                })
​
            .on("start", function(d) { if (d.parent === focus) this.style.display = "inline"; })
​
            .on("end", function(d) { if (d.parent !== focus) this.style.display = "none"; });
      }
    
    });
</script>
    