BigData_Project/chord.html at master · galib360/BigData_Project · GitHub

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

.group text {
  font: 11px sans-serif;
  pointer-events: none;
}

.group path {
  stroke: #000;
}

path.chord {
  stroke-width: .75;
  fill-opacity: .75;
}

</style>
<body>
<script src="//d3js.org/d3.v3.min.js"></script>
<script>

var width = 480,
    height = 500,
    outerRadius = Math.min(width, height) / 2 - 4,
    innerRadius = outerRadius - 20;

var format = d3.format(",.3r");

// Square matrices, asynchronously loaded; credits is the transpose of debits.
var debits = [],
    credits = [];

// The chord layout, for computing the angles of chords and groups.
var layout = d3.layout.chord()
    .sortGroups(d3.descending)
    .sortSubgroups(d3.descending)
    .sortChords(d3.descending)
    .padding(.04);

// The color scale, for different categories of “worrisome” risk.
var fill = d3.scale.ordinal()
    .domain([0, 1, 2])
    .range(["#DB704D", "#D2D0C6", "#ECD08D", "#F8EDD3"]);

// The arc generator, for the groups.
var arc = d3.svg.arc()
    .innerRadius(innerRadius)
    .outerRadius(outerRadius);

// The chord generator (quadratic Bézier), for the chords.
var chord = d3.svg.chord()
    .radius(innerRadius);

// Add an SVG element for each diagram, and translate the origin to the center.
var svg = d3.select("body").selectAll("div")
    .data([debits, credits])
  .enter().append("div")
    .style("display", "inline-block")
    .style("width", width + "px")
    .style("height", height + "px")
  .append("svg")
    .attr("width", width)
    .attr("height", height)
  .append("g")
    .attr("transform", "translate(" + width / 2 + "," + height / 2 + ")");

// Load our data file…
d3.csv("debt.csv", type, function(error, data) {
  if (error) throw error;

  var countryByName = d3.map(),
      countryIndex = -1,
      countryByIndex = [];

  // Compute a unique index for each country.
  data.forEach(function(d) {
    if (countryByName.has(d.creditor)) d.creditor = countryByName.get(d.creditor);
    else countryByName.set(d.creditor, d.creditor = {name: d.creditor, index: ++countryIndex});
    if (countryByName.has(d.debtor)) d.debtor = countryByName.get(d.debtor);
    else countryByName.set(d.debtor, d.debtor = {name: d.debtor, index: ++countryIndex});
    d.debtor.risk = d.risk;
  });

  // Initialize a square matrix of debits and credits.
  for (var i = 0; i <= countryIndex; i++) {
    debits[i] = [];
    credits[i] = [];
    for (var j = 0; j <= countryIndex; j++) {
      debits[i][j] = 0;
      credits[i][j] = 0;
    }
  }

  // Populate the matrices, and stash a map from index to country.
  data.forEach(function(d) {
    debits[d.creditor.index][d.debtor.index] = d;
    credits[d.debtor.index][d.creditor.index] = d;
    countryByIndex[d.creditor.index] = d.creditor;
    countryByIndex[d.debtor.index] = d.debtor;
  });

  // For each diagram…
  svg.each(function(matrix, j) {
    var svg = d3.select(this);

    // Compute the chord layout.
    layout.matrix(matrix);

    // Add chords.
    svg.selectAll(".chord")
        .data(layout.chords)
      .enter().append("path")
        .attr("class", "chord")
        .style("fill", function(d) { return fill(d.source.value.risk); })
        .style("stroke", function(d) { return d3.rgb(fill(d.source.value.risk)).darker(); })
        .attr("d", chord)
      .append("title")
        .text(function(d) { return d.source.value.debtor.name + " owes " + d.source.value.creditor.name + " $" + format(d.source.value) + "B."; });

    // Add groups.
    var g = svg.selectAll(".group")
        .data(layout.groups)
      .enter().append("g")
        .attr("class", "group");

    // Add the group arc.
    g.append("path")
        .style("fill", function(d) { return fill(countryByIndex[d.index].risk); })
        .attr("id", function(d, i) { return "group" + d.index + "-" + j; })
        .attr("d", arc)
      .append("title")
        .text(function(d) { return countryByIndex[d.index].name + " " + (j ? "owes" : "is owed") + " $" + format(d.value) + "B."; });

    // Add the group label (but only for large groups, where it will fit).
    // An alternative labeling mechanism would be nice for the small groups.
    g.append("text")
        .attr("x", 6)
        .attr("dy", 15)
        .filter(function(d) { return d.value > 110; })
      .append("textPath")
        .attr("xlink:href", function(d) { return "#group" + d.index + "-" + j; })
        .text(function(d) { return countryByIndex[d.index].name; });
  });
});

function type(d) {
  d.amount = +d.amount;
  d.risk = +d.risk;
  d.valueOf = value; // for chord layout
  return d;
}

function value() {
  return this.amount;
}

</script>