How - D3.js Heat Map

Ex 3: Bubble Chart

Gist is here

forked from linnnes's block: Ex2: Force Layout 0313

forked from linnnes's block: Ex3: Bubble Chart

<!DOCTYPE html>
<meta charset="utf-8">
<style>

.node {
  cursor: pointer;
}

.node:hover {
  stroke: #000;
  stroke-width: 1.5px;
}

/* the color of small bubbles */
.node--leaf {
  fill: wheat;
}

.label {
  font: 24px "Helvetica Neue", Helvetica, Arial, sans-serif;
  text-anchor: middle;
  text-shadow: 0 1px 0 #fff4f4, 1px 0 0 #fff, -1px 0 0 #fff, 0 -1px 0 #fff;
}

.label,
.node--root,
.node--leaf {
  pointer-events: none;
}

</style>
<svg width="960" height="960"></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%,80%)", "hsl(228,30%,40%)"])
    .interpolate(d3.interpolateHcl);

var pack = d3.pack()
    .size([diameter - margin, diameter - margin])
    .padding(2);

d3.json("flare.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 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"; });
  }

</script>

https://d3js.org/d3.v4.min.js