D3 Examples - Zoomable Circle Packing

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<!DOCTYPE html>
<meta charset="utf-8">
<style>
​
.node {
  cursor: pointer;
}
​
.node:hover {
  stroke: #3f3f3f;
  stroke-width: 4.5px;
}
​
.node--leaf {
  fill: #ffffff;
}
​
.label {
  font: 15px "Helvetica Neue", Helvetica, Arial, sans-serif;
  text-anchor: middle;
  text-shadow: 0 1px 0 #fff, 1px 0 0 #fff, -1px 0 0 #fff, 0 -1px 0 #fff;
}
​
.label,
.node--root,
{
  pointer-events: none;
}
  
#graphic {
    background-color: #ccc;
}  
​
</style>
<svg width="960" height="960"></svg>
<script src="https://d3js.org/d3.v4.min.js"></script>
<script>
​
// var container = d3.select("#container");
// var svg = container.append('svg')
//     .attr('id', 'graphic')
//     .attr('viewBox', "0, 0, " + width + ", " + height)  // min-x, min-y, width, height
//     .attr('preserveAspectRatio', "xMinYMid");
  
var svg = d3.select("svg"),
    margin = 200,
    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%,80%)", "hsl(228,30%,40%)"])
    .interpolate(d3.interpolateHcl);
​
var pack = d3.pack()
    .size([diameter, diameter])
    .padding(2);
  
var tooltip = d3.select("body")
    .append("div")
    .style("position", "absolute")
    .style("visibility", "hidden")  
​
d3.json("colony_result.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;
​
  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(); })
        .on("mouseover", function(d){return tooltip.text(d.data.name).style("visibility", "visible");})
            .on("mousemove", function(d){return !d.children ? tooltip.style("top", (event.pageY-10)+"px").style("left",(event.pageX+10)+"px") : tooltip.style("top", "50px").style("left","50px");})
            .on("mouseout", function(){return tooltip.style("visibility", "hidden");});
​
​
//   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) { 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 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"; });
  }
​
  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; });
  }
});
​
</script>
    