D3 Examples - age pyramid treemap

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<!DOCTYPE html>
<meta charset="utf-8">
<style>
  body {
    font-family: Helvetica;
    font-size: 10px;
  }
​
  .point {
    fill: black;
  }
​
  rect {
    fill: none;
    stroke: black;
    stroke-width: 1;
  }
</style>
<body>
<script src="https://d3js.org/d3.v4.js"></script>
<script src="https://romsson.github.io/d3-gridding/build/d3-gridding.js"></script>
<script src="https://romsson.github.io/d3-gridding/example/utils/utils.js"></script>
<script>
var width = 400,
    height = 300;
​
var data = [];
​
d3.range(10).map(function(d, i) {
  d3.range(2).map(function(e, j) {
    data.push({"index": i, "value": j, "size": i *(j+1) + i*Math.random()});
  });
});
​
var params = [{
  "size": function() { return [width, height]; },
  "offset": function(d) { return [0, 0]; },
  "mode": "vertical",
  "padding": 0,
  "level": 0
}, {
  "size": function(d) { return [d.width, d.height]; },
  "offset": function(d) { return [d.x, d.y]; },
  "mode": "horizontal",
  "valueWidth": "size",
  "orient": function(d, i) { return +d.key % 2 === 0 ? "left": "right";},
  "padding": 10,
  "level": 1
}
];
​
var svgSquares = d3.select("body").append("svg")
    .attr("width", width)
    .attr("height", height)
  .append("g");
​
function update() {
​
  //nested_data = d3.nest()
  //    .key(function(d, i) { return i; })
  //    .entries(data);
​
  var nested_data = generate_nesting(["", "value"], "data")
​
  console.log("NESTED", nested_data)
​
  draw(svgSquares, nested_data[0], params, 0, "0_", false);
​
​
  d3.selectAll(".index").remove();
​
​
​
}
​
update();
​
</script>
    