D3 Examples - TP3-p3-3

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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 { /* useless here */
      fill: none;
      stroke: black;
      stroke-width: 2.5px;
    }
    
    .area {
       //opacity: 0.5;
    }
  </style>
</head>
​
<body>
  <script>
    
    var margin = {top: 20, right: 40, bottom: 20, left: 100};
    var width = 760 - margin.left - margin.right;
    var 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 + ")");
​
​
    // See formats https://bl.ocks.org/zanarmstrong/raw/05c1e95bf7aa16c4768e/
    // Data sample {"name": "G", "value": 10, "date": "2016-07"}
    var parseDate = d3.timeParse("%b %Y");
    var displayDate = d3.timeFormat("%y");
    var displayValue = d3.format(",.0f");
    
    // Ordinal scale
    var x = d3.scaleTime()
        .range([0, width]);
​
        // Linear scale
    var y = d3.scaleLinear()
        .range([height, 0]);
    
    var color = d3.scaleOrdinal(d3.schemeCategory10);
   
    var area = d3.area()
        .curve(d3.curveBasis)
        .x(function(d) { return x(d.date); })
        .y0(function(d) { return y(d.sum_others); })
        .y1(function(d) { return y(d.price); });
    
    var g = svg.append("g")
        ;//.attr("transform", "translate(0, 0)")
    
    
    
    d3.text(
      "https://gist.githubusercontent.com/mbostock/1256572/raw/44c086a6019de56dce35a47197a19468b3e4ad57/stocks.csv", 
      function (err,rawData) {
            
        var dsv  = d3.dsvFormat (',') ;
        var data = dsv.parse (rawData) ;
        data.forEach(function(d) {
                    d.price = +d.price;
            d.date = parseDate(d.date);
        });
        var n_data = d3.nest ()
            .key (function (d) { return d.symbol ; })
            .entries (data) ;
        
        for (i = 0; i < n_data.length; ++i) {
          for (j = 0; j < n_data[i].values.length; ++j) {
            var elem = n_data[i].values[j] ;
            elem.sum_others = 0 ;
            for (k = i + 1; k < n_data.length; ++k) {
              elem.sum_others += n_data[k].values[j].price ;
            }
            elem.price += elem.sum_others ;
          }
        }
        
        console.log(n_data);
      
      x.domain(d3.extent(data, function(d) { return d.date; }));
            y.domain([0, d3.max(data, function(d) { return d.price; })]);
      
      /*svg.selectAll(".label").data(n_data[0].values).enter()
       .append("text")
        .attr("class", "label")
        .text(function(d, i) { return displayDate(d.date); })
        .attr("y", 420)
        .attr("x", function(d) { return x(d.date); })
        .style("font-size", 10)
        .style("font-family", "monospace");*/
        
      svg.append("g")
        .attr("class", "axis axis--x")
        .attr("transform", "translate(0," + height + ")")
        .call(d3.axisBottom(x));
        
      svg.append("g")
        .attr("class", "axis axis--y")
        .attr("transform", "translate(0,0)")
        .call(d3.axisLeft(y).ticks(20));
        
​
      // Display last value
      /*g.selectAll(".value").data([data[data.length -1]]).enter()
       .append("text")
        .text(function(d, i) { return displayValue(d.value); })
        .attr("class", "value")
        .attr("y", function(d) { return y(d.value); })
        .attr("x", width + 10)
        .style("font-size", 20)
        .style("font-family", "monospace");*/
​
      g.selectAll(".area").data(n_data).enter().append("path")
        .attr("class", "area")
        .attr("d", function (d) { return area (d.values) } )
        .attr("fill", function(d,i) { return color (d.key) ; })
        
      var legend = svg.selectAll(".legend")
            .data(color.domain())
            .enter().append("g")
          .attr("class", "legend")
          .attr("transform", function(d, i) { 
          var vals = n_data[i].values ;
          console.log(vals[vals.length -1].price);
          return "translate(" + (width - 40) + "," 
            + (y((vals[vals.length - 1].price
                  + vals[vals.length - 1].sum_others) / 2)) 
            + ")"; });
​
        /*legend.append("rect")
            .attr("x", 30)
            .attr("width", 18)
            .attr("height", 18)
            .style("fill", color);*/
​
            legend.append("text")
        .attr("x", 50)
        .attr("y", 9)
        .attr("dy", ".35em")
        .style("text-anchor", "start")
        .text(function(d) { return d; });
​
    });
​
  </script>
</body>
​
    