d3-voronoi-map usage

This block illustrates the use of the d3-voronoi-map plugin. This block is a remake of the HowMuch.net's post The Costs of Being Fat, in Actual Dollars.

The d3-voronoi-map plugin produces Voronoï maps (one-level treemap). Given a convex polygon (here, a 60-gon simulating a circle for each gender) and weighted data, it tesselates/partitions the polygon in several inner cells, such that the area of a cell represents the weight of the underlying datum.

An iteration on this block enhances the user experience by (i) always producing the same Voronoï map on reloads and (ii) having the same layout (e.g. placing sites/cells of the same type at the same position) which eases comparison.

Acknowledgments to :

D3.js (v.4)
d3-voronoi-map plugin
blockbuilder.org
(part of) https://github.com/ArlindNocaj/Voronoi-Treemap-Library for a Java implementation

<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
    <title>d3-voronoi-treemap usage</title>
    <meta name="description" content="d3-voronoi-map plugin to remake 'The Costs of Being Fat, in Actual Dollars'">
    <script src="https://d3js.org/d3.v4.min.js" charset="utf-8"></script>
    <script src="https://rawcdn.githack.com/kcnarf/d3-weighted-voronoi/v1.0.0/build/d3-weighted-voronoi.js"></script>
    <script src="https://rawcdn.githack.com/kcnarf/d3-voronoi-map/v1.2.0/build/d3-voronoi-map.js"></script>
    <style>
      svg {
        background-color: rgb(250,250,250);
      }
      
      #title {
        letter-spacing: 4px;
        font-weight: 700;
        font-size: x-large;
      }
      
      text.tiny {
        font-size: 10pt;
      }
      text.light {
        fill: lightgrey
      }
      
      .symbol {
        fill: none;
        stroke: lightgrey;
        stroke-width: 14px;
      }
      
      .cell {
        stroke: darkgrey;
        stroke-width: 1px;
      }
      
      .cost {
        text-anchor: middle;
      }
      
      .total-cost {
        fill: lightgrey;
        text-anchor: middle;
        font-size: 20px;
        font-weight: 700;
      }
      
      .legend-color {
        stroke-width: 1px;
        stroke:darkgrey;
      }
      
      .highlighter {
        fill: transparent;
        stroke: none;
      }
      .highlight {
        stroke: black;
        stroke-width: 2px;
      }
    </style>
  </head>
  <body>
    <svg></svg>
    
    <script>
      //begin: constants
      var _2PI = 2*Math.PI;
      //end: constants
      
      //begin: raw data global def
      var menTotalCost = 0,
          womenTotalCost = 0;
      //end: raw data global def
      
      //begin: data-related utils
      function menCostAccessor(d){ return d.menCost; };
      function womenCostAccessor(d){ return d.womenCost; };
      function highlighterGroup(d){ return "group-"+d.id};
      //end: data-related utils
      
      //begin: layout conf.
      var svgWidth = 960,
          svgHeight = 500,
          margin = {top: 10, right: 10, bottom: 10, left: 10},
          height = svgHeight - margin.top - margin.bottom,
          width = svgWidth - margin.left - margin.right,
          halfWidth = width/2,
          halfHeight = height/2,
          quarterWidth = width/4,
          quarterHeight = height/4,
          titleY = 20,
          legendsMinY = height - 20,
          menTreemapCenter = [300, 200],
          womenTreemapCenter = [650, 200];
      //end: layout conf.
      
      //begin: treemap conf.
      var baseRadius = 100;
      var _voronoiMap = d3.voronoiMap();
      var menRadius, womenRadius,
          menCirclingPolygon, womenCirclingPolygon,
          menPolygons, womenPolygons;
      //end: treemap conf.
      
      //begin: reusable d3Selection
      var svg, drawingArea, menContainer, womenContainer;
      //end: reusable d3Selection
      
      d3.csv("costOfBeingFat.csv", csvParser, function(error, data) {
        if (error) throw error;
        
        initData();
        initLayout();
        drawLegends(data);
        
        menPolygons = _voronoiMap
          .clip(menCirclingPolygon)
          .weight(menCostAccessor)
        	(data.filter( function(d){ return menCostAccessor(d)>0; })).polygons;
        womenPolygons = _voronoiMap
          .clip(womenCirclingPolygon)
          .weight(womenCostAccessor)
        	(data.filter( function(d){ return womenCostAccessor(d)>0; })).polygons;
        
        drawTreemap("men");
        drawTreemap("women");
        
        attachMouseListener(data);
      });

Updated missing url https://rawcdn.githack.com/Kcnarf/d3-weighted-voronoi/v1.0.0/build/d3-weighted-voronoi.js to https://rawcdn.githack.com/kcnarf/d3-weighted-voronoi/v1.0.0/build/d3-weighted-voronoi.js

Updated missing url https://rawcdn.githack.com/Kcnarf/d3-voronoi-map/v1.2.0/build/d3-voronoi-map.js to https://rawcdn.githack.com/kcnarf/d3-voronoi-map/v1.2.0/build/d3-voronoi-map.js

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

https://rawcdn.githack.com/Kcnarf/d3-weighted-voronoi/v1.0.0/build/d3-weighted-voronoi.js

https://rawcdn.githack.com/Kcnarf/d3-voronoi-map/v1.2.0/build/d3-voronoi-map.js