D3 Examples - The Lottery of Life

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<!DOCTYPE html>
<html>
<head>
  <title>The Lottery of Life</title>
  <style>
  body {
    font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
    font-size: 10px;
    color: #333;
  }
​
  text {
    fill: #333;
  }
​
  .axis .domain {
    fill: none;
  }
​
 .title {
    text-anchor: middle;
  }
  </style>
</head>
​
<body>
  <script src="https://d3js.org/d3.v3.min.js"></script>
  <script>
  var fadeTo = 0.3;
​
  var margin = {top: 10, right: 5, bottom: 120, left: 50};
  
  var width = 960 - margin.left - margin.right,
      height = 500 - margin.top - margin.bottom;
  
  var svg = d3.select('body').append('svg')
      .attr('width', width + margin.left + margin.right)
      .attr('height', height + margin.top + margin.bottom)
    .append('g')
      .attr('transform', 'translate(' + margin.left + ',' + margin.top + ')'),
    legend = svg.append('g');
​
  svg.append('g').attr('class', 'y axis')
      .attr('transform', 'translate(-5,0)')
    .append('text')
      .attr('class', 'title')
      .attr('transform', 'translate(' + (-margin.left) + ',' + (height/2) + ')rotate(-90)')
      .attr('dy', '1.4em')
      .text('Birth Rate (per 1,000 people)');
​
  svg.append('g').attr('class', 'x axis')
      .attr('transform', 'translate(0,' + (height + 15) + ')')
    .append('text')
      .attr('class', 'title')
      .attr('transform', 'translate(' + (width/2) + ',' + margin.bottom + ')')
      .attr('dy', '-2.4em')
      .text('Rank');
​
  var x = d3.scale.linear().domain([0, 10]).range([0, width]),
    y = d3.scale.linear().range([height, 0]),
    yAxis = d3.svg.axis().scale(y).orient('left'),
    color = d3.scale.ordinal().range(['#8DD3C7', '#FDB462', '#BEBADA', '#FB8072', '#80B1D3', '#B3DE69']);
​
  var birthRate = d3.format('.2f'),
    population = d3.format('.2s');
​
  d3.json('data.json', update);
​
  function update(data) {
    var yExtent = [0, Number.MIN_VALUE],
      continents = [];
​
    data = data.filter(function (d) { return !!d.births; });
​
    data.forEach(function (d) {
      if (continents.indexOf(d.continent) < 0) {
        continents.push(d.continent);
      }
​
      if (d.births) {
        var births = d3.map();
​
        d.births.forEach(function (b) {
          births.set(b.year, b.value);
          yExtent[1] = Math.max(yExtent[1], b.value);
        });
​
        d.births = births;
      }
    });
​
    continents = continents.sort(d3.ascending);
    color.domain(continents);
​
    x.domain(d3.extent(data, function (d) { return d.rank; }));
    y.domain(yExtent);
​
    var plot = svg.selectAll('.point')
        .data(data, function (d) { return d['country code']; });
​
    plot.transition().duration(750)
        .attr('cx', function (d) { return x(d.rank); })
        .attr('cy', function (d) { return y(d.births.get(2010)); });
​
    plot.enter().append('circle').attr('class', 'point')
        .attr('cx', function (d) { return x(d.rank); })
        .attr('cy', function (d) { return y(d.births.get(2010)); })
        .attr('r', 4)
        .style('fill', function (d) { return color(d.continent); })
        .style('opacity', 0)
        .on('mouseover', hover)
        .on('mouseout', unhover)
      .transition().duration(500)
        .delay(function (d, i) { return d.rank * 150; })
        .style('opacity', 1);
​
    plot.exit().remove();
​
    var labelData = d3.map();
    data.forEach(function (d) {
      if (!labelData.has(d.rank)) {
        labelData.set(d.rank, []);
      }
​
      labelData.get(d.rank).push(d);
    });
​
    var rank = svg.selectAll('.x.axis').selectAll('.label')
        .data(labelData.values().sort(function (a, b) { return d3.ascending(a[0].rank, b[0].rank); }), function (d) { return d.country; });
​
    rank.enter().append('g').attr('class', 'label')
        .style('opacity', 0)
      .transition().duration(500)
        .delay(function (d, i) { return d[0].rank * 150; })
        .style('opacity', 1);
​
    rank.attr('transform', function (d) { return 'translate(' + x(d[0].rank) + ',0)rotate(-45)'; })
        .call(function (selection) {
          selection.each(function (d, i) {
            var label = d3.select(this).selectAll('text').data(d);
​
            label.enter().append('text')
                .attr('class', 'label')
                .style('text-anchor', 'end')
                .on('mouseover', hover)
                .on('mouseout', unhover);
​
            label.text(function (d) { return d.country; })
                .attr('transform', function (d, i) {
                  var offset = 0, n = i;
​
                  while (n-- > 0) {
                    offset -= label[n][0].getBBox().width + 10;
                  }
​
                  return 'translate(' + offset + ',0)';
                });
          });
        });
​
    rank.exit().remove();
​
    svg.selectAll('.y.axis').call(yAxis);
​
    var l = legend.selectAll('.legend').data(continents);
    var lEnter = l.enter().append('g').attr('class', 'legend');
​
    lEnter.append('rect')
        .attr('x', -10)
        .attr('y', -10)
        .attr('width', 12)
        .attr('height', 12);
​
    lEnter.append('text')
        .attr('transform', 'translate(8,0)');
​
    l.selectAll('rect')
        .style('fill', function (d) { return color(d); });
    l.selectAll('text').text(String);
​
    l.attr('transform', function (d, i) { return 'translate(10,' + (i * 14) + ')'; })
        .on('mouseover', legendHover)
        .on('mouseout', unhover);
  }
​
  function hover(d) {
    svg.selectAll('.x.axis text.label')
      .transition().duration(500)
        .style('opacity', function (q) {
          return d.country === q.country ? 1 : fadeTo;
        });
​
    svg.selectAll('.point')
      .transition().duration(500)
        .style('opacity', function (q) {
          return d.country === q.country ? 1: fadeTo;
        });
  }
​
  function legendHover(d) {
    svg.selectAll('.point')
      .transition().duration(500)
        .style('opacity', function (q) {
          return d === q.continent ? 1 : fadeTo;
        });
​
    svg.selectAll('.x.axis text.label')
      .transition().duration(500)
        .style('opacity', function (q) {
          return d === q.continent ? 1 : fadeTo;
        });
  }
​
  function unhover(d) {
    svg.selectAll('.point, .x.axis text.label')
      .transition().duration(500)
        .style('opacity', 1);
  }
​
  </script>
</body>
​
</html>
    