D3 Examples - Visualising Ratios

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<!DOCTYPE html>
<head>
  <meta charset="utf-8">
  <script src="https://d3js.org/d3.v4.min.js"></script>
  <style>
    text {
      font-family: monospace;
    }
  </style>
</head>
​
<body>
  <script>
        var margin = {top: 70, right: 20, bottom: 20, left: 20};
    
    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 + ")");
    
    var ratios = [
      {min: 34, median: 8},
      {min: 14.1, median: 7.6},
      {min: 15, median: 9},
      {min: 12.9, median: 5.8},
      {min: 10.6, median: 4.2},
      {min: 40, median: 5.9},
      {min: 14.3, median: 5.58}
    ];
​
    // might use this at some point
        // ratios.sort(function(a, b) {
        //  return b.min - a.min;
        // })
    
    var xSpacing = 15,
        ySpacing = 30;
    
    var ratioGroups = svg.selectAll("g")
        .data(ratios)
    .enter().append("g")
        .attr("class", "ratio");
    
    var counter = 0;
    
    ratioGroups.selectAll("circles")
        .data(function(d, i) { 
        var range = d3.range(0, Math.round(d.min), 1);
        return range.map(function(x) {
          return {x: x, i: i};
        })
        })
    .enter().append("circle")
      .attr("cx", function(d) { return margin.left + d.x * xSpacing })
        .attr("cy", function(d) { return margin.top + d.i * ySpacing })
        .attr("r", function(d) {
        if (d.x == 0) {
          return 5;
        } else {
          return 0.001;
        }
        })
        .attr("fill", function(d) {
        if (d.x == 0) {
          d3.select(this).raise();
          return "red";
        } else {
          return "black";
        }
        })
        .transition()
        .delay(function(d) {
                return (d.x * 25) + (d.i * 100);
        })
      .attr("r", 5)
    
    // delay by the amount of time each ratio takes to animate
    ratioGroups
        .append("text")
        .attr("x", function(d) { return margin.left + Math.round(d.min) * xSpacing })
        .attr("y", function(d, i) { return margin.top + i * ySpacing })
        .attr("dy", "0.35em")
        .text(function(d) { return d.min + ":1"; })
        .attr("opacity", 0)
        .transition()
        .delay(function(d, i) { return (Math.round(d.min) * 25) + (i * 100) })
        .attr("opacity", 1);
    
  </script>
</body>
​
    