D3 Examples - Stream

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<!DOCTYPE html>
<head>
  <meta charset="utf-8">
  <script src="https://d3js.org/d3.v4.min.js"></script>
  <style>
    body { margin:0;position:fixed;top:0;right:0;bottom:0;left:0; }
    
        svg {
        font: 10px sans-serif;
        }
​
    .line {
      fill: none;
      stroke: black;
      stroke-width: 2px;
    }
  </style>
</head>
​
<body>
  <script>
    
  var margin = {top: 20, right: 30, bottom: 20, left: 100},
      width = 760 - margin.left - margin.right,
      height = 300 - 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 parseDate = d3.timeParse("%b %Y");
​
    var x = d3.scaleTime().range([0, width]),
    y = d3.scaleLinear().range([height, 0]),
    c = d3.scaleOrdinal(d3.schemeCategory10);
​
   var line = d3.line()
    .curve(d3.curveBasis)
    .x(function(d) { return x(d.date); })
    .y(function(d) { return y(d.price); });
    
    var area = d3.area()
         .curve(d3.curveBasis)
    .x(function(d) {  return x(d.data.date); })
    .y0(function(d) { return y(d[0]); })
    .y1(function(d) { return y(d[1]); });
    
  d3.text('dataset.csv', function(error, raw) {
​
    var dsv = d3.dsvFormat(',')
    var data = dsv.parse(raw);
    
    // Nest stock values by symbol.
    var symbols = d3.nest()
        .key(function(d) { return d.symbol; })
        .entries(data);
    
    var dates = d3.nest()
        .key(function(d) { return d.date; })
        .entries(data);
        var keys = [];
        //console.log(dates);
    
    
        // Parse and caculate some values for each symbols
    symbols.forEach(function(s) {
      s.values.forEach(function(d) { 
        d.date = parseDate(d.date); 
        d.price = +d.price; 
      });
      keys.push(s.key)
      s.maxPrice = d3.max(s.values, function(d) { return d.price; });
      s.sumPrice = d3.sum(s.values, function(d) { return d.price; });
      //console.log(symbols);
    });
    
    var table = []
    dates.forEach(function(d){
      var valeur = {};
      var c = 0;
      valeur["date"] = parseDate(d.key);
      d.values.forEach(function(v){
        valeur[keys[c]] = v.price;
        c++;
      });
      //console.log(valeur);
      table.push(valeur);
    });
    
    //console.log(keys);
    //console.log(table);
    var stack = d3.stack().keys(keys).offset(d3.stackOffsetWiggle);
    
    var series = stack(table);
    
    x.domain(d3.extent(data, function(d) { return d.date; }));
​
    y.domain([d3.min(series, stackMin), d3.max(series, stackMax)])    
​
    svg.selectAll(".layer")
        .data(series)
        .enter().append("g")
      .attr("class", "layer")
            .append("path")
      .attr("class", "area")
      .style("fill", function(d) { return c(d.key); })
      .attr("d", area);
    
    svg.append("g")
        .attr("class", "axis axis--x")
        .attr("transform", "translate(0," + height + ")")
        .call(d3.axisBottom(x));
    
  });
    
    function stackMax(layer) {
  return d3.max(layer, function(d) { return d[1]; });
}
​
function stackMin(layer) {
  return d3.min(layer, function(d) { return d[0]; });
}
  </script>
</body>
    