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HTML

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<div id="tooltip"></div>

JavaScript

Module

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//*******************************************************************
//  CHORD MAPPER 
//*******************************************************************
function chordMpr (data) {
  var mpr = {}, mmap = {}, n = 0,
      matrix = [], filter, accessor;
​
  mpr.setFilter = function (fun) {
    filter = fun;
    return this;
  },
  mpr.setAccessor = function (fun) {
    accessor = fun;
    return this;
  },
  mpr.getMatrix = function () {
    matrix = [];
    _.each(mmap, function (a) {
      if (!matrix[a.id]) matrix[a.id] = [];
      _.each(mmap, function (b) {
       var recs = _.filter(data, function (row) {
          return filter(row, a, b);
        })
        matrix[a.id][b.id] = accessor(recs, a, b);
      });
    });
    return matrix;
  },
  mpr.getMap = function () {
    return mmap;
  },
  mpr.printMatrix = function () {
    _.each(matrix, function (elem) {
      console.log(elem);
    })
  },
  mpr.addToMap = function (value, info) {
    if (!mmap[value]) {
      mmap[value] = { name: value, id: n++, data: info }
    }
  },
  mpr.addValuesToMap = function (varName, info) {
    var values = _.uniq(_.pluck(data, varName));
    _.map(values, function (v) {
      if (!mmap[v]) {
        mmap[v] = { name: v, id: n++, data: info }
      }
    });
    return this;
  }
  return mpr;
}
//*******************************************************************
//  CHORD READER
//*******************************************************************
function chordRdr (matrix, mmap) {
  return function (d) {
    var i,j,s,t,g,m = {};
    if (d.source) {
      i = d.source.index; j = d.target.index;
      s = _.where(mmap, {id: i });
      t = _.where(mmap, {id: j });
      m.sname = s[0].name;
      m.sdata = d.source.value;
      m.svalue = +d.source.value;
      m.stotal = _.reduce(matrix[i], function (k, n) { return k + n }, 0);
      m.tname = t[0].name;
      m.tdata = d.target.value;
      m.tvalue = +d.target.value;
      m.ttotal = _.reduce(matrix[j], function (k, n) { return k + n }, 0);
    } else {
      g = _.where(mmap, {id: d.index });
      m.gname = g[0].name;
      m.gdata = g[0].data;
      m.gvalue = d.value;
    }
    m.mtotal = _.reduce(matrix, function (m1, n1) { 
      return m1 + _.reduce(n1, function (m2, n2) { return m2 + n2}, 0);
    }, 0);
    return m;
  }
}
​
​
​
//*******************************************************************
        //  CREATE MATRIX AND MAP
        //*******************************************************************
        var data = [{ "has": "black", "prefers": "red", "count": "2868" }, { "has": "blonde", "prefers": "brown", "count": "2060" }, { "has": "brown", "prefers": "blonde", "count": "16145" }, { "has": "red", "prefers": "black", "count": "1013" }, { "has": "black", "prefers": "brown", "count": "8916" }, { "has": "blonde", "prefers": "blonde", "count": "10048" }, { "has": "brown", "prefers": "black", "count": "8010" }, { "has": "red", "prefers": "red", "count": "6907" }, { "has": "black", "prefers": "blonde", "count": "5871" }, { "has": "blonde", "prefers": "black", "count": "1951" }, { "has": "brown", "prefers": "red", "count": "8045" }, { "has": "red", "prefers": "brown", "count": "940" }, { "has": "black", "prefers": "black", "count": "11975" }, { "has": "blonde", "prefers": "red", "count": "6171" }, { "has": "brown", "prefers": "brown", "count": "8090" }, { "has": "red", "prefers": "blonde", "count": "990" }];
​
        var mpr = chordMpr(data);
​
        mpr
          .addValuesToMap('has')
          .setFilter(function (row, a, b) {
              return (row.has === a.name && row.prefers === b.name)
          })
          .setAccessor(function (recs, a, b) {
              if (!recs[0]) return 0;
              return +recs[0].count;
          });
        drawChords(mpr.getMatrix(), mpr.getMap());
​
        //*******************************************************************
        //  DRAW THE CHORD DIAGRAM
        //*******************************************************************
        function drawChords(matrix, mmap) {
            var w = 980, h = 800, r1 = h / 2, r0 = r1 - 100;
​
            var fill = d3.scale.ordinal()
                .domain(d3.range(4))
                .range(["#000000", "#FFDD89", "#957244", "#F26223"]);
​
            var chord = d3.layout.chord()
                .padding(.02)
                .sortSubgroups(d3.descending)
                .sortChords(d3.descending);
​
            var arc = d3.svg.arc()
                .innerRadius(r0)
                .outerRadius(r0 + 20);
​
            var svg = d3.select("body").append("svg:svg")
                .attr("width", w)
                .attr("height", h)
              .append("svg:g")
                .attr("id", "circle")
                .attr("transform", "translate(" + w / 2 + "," + h / 2 + ")");
​
            svg.append("circle")
                .attr("r", r0 + 20);
​
            var rdr = chordRdr(matrix, mmap);
            chord.matrix(matrix);
​
            var g = svg.selectAll("g.group")
                .data(chord.groups())
              .enter().append("svg:g")
                .attr("class", "group")
                .on("mouseover", mouseover)
                .on("mouseout", function (d) { d3.select("#tooltip").style("visibility", "hidden") });
​
            g.append("svg:path")
                .style("stroke", "black")
                .style("fill", function (d) { return fill(d.index); })
                .attr("d", arc);
​
            g.append("svg:text")
                .each(function (d) { d.angle = (d.startAngle + d.endAngle) / 2; })
                .attr("dy", ".35em")
                .style("font-family", "helvetica, arial, sans-serif")
                .style("font-size", "10px")
                .attr("text-anchor", function (d) { return d.angle > Math.PI ? "end" : null; })
                .attr("transform", function (d) {
                    return "rotate(" + (d.angle * 180 / Math.PI - 90) + ")"
                        + "translate(" + (r0 + 26) + ")"
                        + (d.angle > Math.PI ? "rotate(180)" : "");
                })
                .text(function (d) { return rdr(d).gname; });
​
            var chordPaths = svg.selectAll("path.chord")
                  .data(chord.chords())
                .enter().append("svg:path")
                  .attr("class", "chord")
                  .style("stroke", function (d) { return d3.rgb(fill(d.target.index)).darker(); })
                  .style("fill", function (d) { return fill(d.target.index); })
                  .attr("d", d3.svg.chord().radius(r0))
                  .on("mouseover", function (d) {
                      d3.select("#tooltip")
                        .style("visibility", "visible")
                        .html(chordTip(rdr(d)))
                        .style("top", function () { return (d3.event.pageY - 100) + "px" })
                        .style("left", function () { return (d3.event.pageX - 100) + "px"; })
                  })
                  .on("mouseout", function (d) { d3.select("#tooltip").style("visibility", "hidden") });
​
            function chordTip(d) {
                var p = d3.format(".2%"), q = d3.format(",.3r")
                return "Chord Info:<br/>"
                  + p(d.svalue / d.stotal) + " (" + q(d.svalue) + ") of "
                  + d.sname + " prefer " + d.tname
                  + (d.sname === d.tname ? "" : ("<br/>while...<br/>"
                  + p(d.tvalue / d.ttotal) + " (" + q(d.tvalue) + ") of "
                  + d.tname + " prefer " + d.sname))
            }
​
            function groupTip(d) {
                var p = d3.format(".1%"), q = d3.format(",.3r")
                return "Group Info:<br/>"
                    + d.gname + " : " + q(d.gvalue) + "<br/>"
                    + p(d.gvalue / d.mtotal) + " of Matrix Total (" + q(d.mtotal) + ")"
            }
​
            function mouseover(d, i) {
                d3.select("#tooltip")
                  .style("visibility", "visible")
                  .html(groupTip(rdr(d)))
                  .style("top", function () { return (d3.event.pageY - 80) + "px" })
                  .style("left", function () { return (d3.event.pageX - 130) + "px"; })
​
                chordPaths.classed("fade", function (p) {
                    return p.source.index != i
                        && p.target.index != i;
                });
            }
        }

CSS

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#tooltip {
            color: white;
            opacity: .9;
            background: #333;
            padding: 5px;
            border: 1px solid lightgrey;
            border-radius: 5px;
            position: absolute;
            z-index: 10;
            visibility: hidden;
            white-space: nowrap;
            pointer-events: none;
        }
​
        #circle circle {
            fill: none;
            pointer-events: all;
        }
​
        path.group {
            fill-opacity: .8;
        }
​
        path.chord {
            fill-opacity: .8;
            stroke: #000;
            stroke-width: .25px;
        }
​
        #circle:hover path.fade {
            display: none;
        }

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