D3 Examples - Barley Punchcard

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<!doctype html>
<script src="https://d3js.org/d3.v4.min.js"></script>
<style type="text/css">
  body {
    font-family: sans-serif;
  }
  svg {
    border:1px solid #d0d0d0;
  }
  text {
    font-size: 16px;
    fill: #888;
  }
  path, line {
    stroke: #888;
  }
</style>
<body>
</body>
<script>
  // properties
  var margin = {top: 20, right: 30, bottom: 30, left: 120};
  var width = 800 - margin.left - margin.right;
  var height = 600 - margin.top - margin.bottom;
​
  var yscale = d3.scalePoint();
  var xscale = d3.scaleLinear();
  var radius = d3.scaleSqrt();
  var color = d3.scaleOrdinal(d3.schemeCategory20b);
  
  d3.csv('barleyfull.csv', function(err, data) {
    if (err) { throw error; }
    
    data.forEach(function(d) {
      d.yield = +d.yield;
      d.year = +d.year;
    });
    
    var nested = d3.nest()
      .key(function(d) { return d.site; })
      .key(function(d) { return d.gen; })
      .entries(data);
    
    console.log(nested);
   
   
    var site = nested[4];
​
    yscale
      .range([0, height])
      .domain(site.values.map(function(d) { return d.key; }))
      .round(true);
​
    xscale
      .range([0, width])
      .domain([1927, 1936]);
​
    radius
      .range([0, 15])
      .domain([0, d3.max(data, function(d) { return d.yield; }) ]);
​
    var yaxis = d3.axisLeft()
      .scale(yscale);
​
    var xaxis = d3.axisBottom()
      .tickFormat(function(d) { return d; })
      .scale(xscale);
​
    var chart = d3.select("body")
      .append("div")
      .datum(site);
​
    chart.append("h2")
      .text(function(d) { return d.key; });
​
    var svg = chart.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] + ')');
​
    svg.append("g")
      .call(yaxis);
​
    svg.append("g")
      .attr("transform", "translate(0," + height + ")")
      .call(xaxis);
​
    var rows = svg.selectAll("g.row")
      .data(function(d) { return d.values; })
      .enter().append("g")
      .attr("class", function(d) { return d.key + " row"; })
      .attr("transform", function(d) {
        return "translate(0," + yscale(d.key) + ")"
      });
​
    rows.selectAll("circle")
      .data(function(d) { return d.values; })
      .enter().append("circle")
      .attr("r", function(d) { return radius(d.yield); })
      .attr("cy", 0)
      .attr("cx", function(d) { return xscale(d.year); })
      .attr("fill", function(d) { return color(d.gen); });
​
  });
</script>
​
    