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Treemap Proto for GUI

<!DOCTYPE html>
<html class="ocks-org">
<meta charset="utf-8">
<title>Zoomable Treemaps</title>
<style>

@import url(//fonts.googleapis.com/css?family=PT+Serif|PT+Serif:b|PT+Serif:i|PT+Sans|PT+Sans:b);

html {
  min-width: 1040px;
}

.ocks-org body {
  background: #fcfcfa;
  color: #333;
  font-family: "PT Serif", serif;
  margin: 1em auto 4em auto;
  position: relative;
  width: 960px;
}

.ocks-org header,
.ocks-org footer,
.ocks-org aside,
.ocks-org h1,
.ocks-org h2,
.ocks-org h3,
.ocks-org h4 {
  font-family: "PT Sans", sans-serif;
}

.ocks-org h1,
.ocks-org h2,
.ocks-org h3,
.ocks-org h4 {
  color: #000;
}

.ocks-org header,
.ocks-org footer {
  color: #636363;
}

h1 {
  font-size: 64px;
  font-weight: 300;
  letter-spacing: -2px;
  margin: .3em 0 .1em 0;
}

h2 {
  margin-top: 2em;
}

h1, h2 {
  text-rendering: optimizeLegibility;
}

h2 a[name],
h2 a[id] {
  color: #ccc;
  right: 100%;
  padding: 0 .3em;
  position: absolute;
}

header,
footer {
  font-size: small;
}

.ocks-org header aside,
.ocks-org footer aside {
  float: left;
  margin-right: .5em;
}

.ocks-org header aside:after,
.ocks-org footer aside:after {
  padding-left: .5em;
  content: "/";
}

footer {
  margin-top: 8em;
}

h1 ~ aside {
  font-size: small;
  right: 0;
  position: absolute;
  width: 180px;
}

.attribution {
  font-size: small;
  margin-bottom: 2em;
}

body > p, li > p {
  line-height: 1.5em;
}

body > p {
  width: 720px;
}

body > blockquote {
  width: 640px;
}

blockquote q {
  display: block;
  font-style: oblique;
}

ul {
  padding: 0;
}

li {
  width: 690px;
  margin-left: 30px;
}

a {
  color: steelblue;
}

a:not(:hover) {
  text-decoration: none;
}

pre, code, textarea {
  font-family: "Menlo", monospace;
}

code {
  line-height: 1em;
}

textarea {
  font-size: 100%;
}

body > pre {
  border-left: solid 2px #ccc;
  padding-left: 18px;
  margin: 2em 0 2em -20px;
}

.html .value,
.javascript .string,
.javascript .regexp {
  color: #756bb1;
}

.html .tag,
.css .tag,
.javascript .keyword {
  color: #3182bd;
}

.comment {
  color: #636363;
}

.html .doctype,
.javascript .number {
  color: #31a354;
}

.html .attribute,
.css .attribute,
.javascript .class,
.javascript .special {
  color: #e6550d;
}

svg {
  font: 10px sans-serif;
}

.axis path, .axis line {
  fill: none;
  stroke: #000;
  shape-rendering: crispEdges;
}

sup, sub {
  line-height: 0;
}

q:before {
  content: "â€œ";
}

q:after {
  content: "â€";
}

blockquote q {
  line-height: 1.5em;
  display: inline;
}

blockquote q:before,
blockquote q:after {
  content: "";
}
  
#chart {
  width: 960px;
  height: 500px;
  background: #ddd;
}

text {
  pointer-events: none;
}

.grandparent text {
  font-weight: bold;
}

rect {
  fill: none;
  stroke: #fff;
}

rect.parent,
.grandparent rect {
  stroke-width: 2px;
}

.grandparent rect {
  fill: orange;
}

.grandparent:hover rect {
  fill: #ee9700;
}

.children rect.parent,
.grandparent rect {
  cursor: pointer;
}

.children rect.parent {
  fill: #bbb;
  fill-opacity: .5;
}

.children:hover rect.child {
  fill: #bbb;
}

</style>

<h1>Zoomable Treemaps</h1>

<aside>Click any cell to zoom in, or the top orange label to zoom out.</aside>

var margin = {top: 20, right: 0, bottom: 0, left: 0},
    width = 960,
    height = 500 - margin.top - margin.bottom,
    formatNumber = d3.format(",d"),
    transitioning;

var x = d3.scale.linear()
    .domain([0, width])
    .range([0, width]);

var y = d3.scale.linear()
    .domain([0, height])
    .range([0, height]);

var treemap = d3.layout.treemap()
    .children(function(d, depth) { return depth ? null : d._children; })
    .sort(function(a, b) { return a.value - b.value; })
    .ratio(height / width * 0.5 * (1 + Math.sqrt(5)))
    .round(false);

var svg = d3.select("#chart").append("svg")
    .attr("width", width + margin.left + margin.right)
    .attr("height", height + margin.bottom + margin.top)
    .style("margin-left", -margin.left + "px")
    .style("margin.right", -margin.right + "px")
  .append("g")
    .attr("transform", "translate(" + margin.left + "," + margin.top + ")")
    .style("shape-rendering", "crispEdges");

var grandparent = svg.append("g")
    .attr("class", "grandparent");

grandparent.append("rect")
    .attr("y", -margin.top)
    .attr("width", width)
    .attr("height", margin.top);

grandparent.append("text")
    .attr("x", 6)
    .attr("y", 6 - margin.top)
    .attr("dy", ".75em");

d3.json("data.json", function(root) {
  initialize(root);
  accumulate(root);
  layout(root);
  display(root);

function initialize(root) {
    root.x = root.y = 0;
    root.dx = width;
    root.dy = height;
    root.depth = 0;
  }

// Aggregate the values for internal nodes. This is normally done by the
  // treemap layout, but not here because of our custom implementation.
  // We also take a snapshot of the original children (_children) to avoid
  // the children being overwritten when when layout is computed.
  function accumulate(d) {
    return (d._children = d.children)
        ? d.value = d.children.reduce(function(p, v) { return p + accumulate(v); }, 0)
        : d.value;
  }

// Compute the treemap layout recursively such that each group of siblings
  // uses the same size (1×1) rather than the dimensions of the parent cell.
  // This optimizes the layout for the current zoom state. Note that a wrapper
  // object is created for the parent node for each group of siblings so that
  // the parent’s dimensions are not discarded as we recurse. Since each group
  // of sibling was laid out in 1×1, we must rescale to fit using absolute
  // coordinates. This lets us use a viewport to zoom.
  function layout(d) {
    if (d._children) {
      treemap.nodes({_children: d._children});
      d._children.forEach(function(c) {
        c.x = d.x + c.x * d.dx;
        c.y = d.y + c.y * d.dy;
        c.dx *= d.dx;
        c.dy *= d.dy;
        c.parent = d;
        layout(c);
      });
    }
  }

function display(d) {
    grandparent
        .datum(d.parent)
        .on("click", transition)
      .select("text")
        .text(name(d));

var g1 = svg.insert("g", ".grandparent")
        .datum(d)
        .attr("class", "depth");

var g = g1.selectAll("g")
        .data(d._children)
      .enter().append("g");

g.filter(function(d) { return d._children; })
        .classed("children", true)
        .on("click", transition);

g.selectAll(".child")
        .data(function(d) { return d._children || [d]; })
      .enter().append("rect")
        .attr("class", "child")
        .call(rect);

g.append("rect")
        .attr("class", "parent")
        .call(rect)
      .append("title")
        .text(function(d) { return formatNumber(d.value); });

g.append("text")
        .attr("dy", ".75em")
        .text(function(d) { return d.name; })
        .call(text);

function transition(d) {
      if (transitioning || !d) return;
      transitioning = true;

var g2 = display(d),
          t1 = g1.transition().duration(750),
          t2 = g2.transition().duration(750);

// Update the domain only after entering new elements.
      x.domain([d.x, d.x + d.dx]);
      y.domain([d.y, d.y + d.dy]);

// Enable anti-aliasing during the transition.
      svg.style("shape-rendering", null);

// Draw child nodes on top of parent nodes.
      svg.selectAll(".depth").sort(function(a, b) { return a.depth - b.depth; });

// Fade-in entering text.
      g2.selectAll("text").style("fill-opacity", 0);

// Transition to the new view.
      t1.selectAll("text").call(text).style("fill-opacity", 0);
      t2.selectAll("text").call(text).style("fill-opacity", 1);
      t1.selectAll("rect").call(rect);
      t2.selectAll("rect").call(rect);

// Remove the old node when the transition is finished.
      t1.remove().each("end", function() {
        svg.style("shape-rendering", "crispEdges");
        transitioning = false;
      });
    }

return g;
  }

function text(text) {
    text.attr("x", function(d) { return x(d.x) + 6; })
        .attr("y", function(d) { return y(d.y) + 6; });
  }

function name(d) {
    return d.parent
        ? name(d.parent) + "." + d.name
        : d.name;
  }
});

</script>

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