D3 Examples - Multiple lines

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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>
​
    
    // NOTE : some of the functions here were copy-pasted from a colleague
    // I tried to do different chart among the one we were supposed to do, but
    // accidentaly deleted everything. Drawareas and drawlines are thus close to 
    // what I ahd achieved on my own.
    // I got stuck withdrawstreams.
    
  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); });
    
  //NESTING
  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);
        // 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; 
      });
      s.maxPrice = d3.max(s.values, function(d) { return d.price; });
      s.sumPrice = d3.sum(s.values, function(d) { return d.price; });
    });
    // SCALES
    x.domain(d3.extent(data, function(d) { return d.date; }));
​
    y.domain([0, d3.max(symbols.map(function(d) { return d.maxPrice; }))])
​
    
    
drawlines()  
//drawallarea()
//drawareas()
drawstream()
​
​
function drawstream(){
  
    // STREAMLINE : https://bl.ocks.org/mbostock/4060954
    var stack = d3.stack()
            .keys(["AAPL","MSFT", "IBM", "AMZN"])
            //.offset(d3.stackOffsetWiggle)
            .value(function(d,key){return d.price})
    
        layer_stream = stack(data)
        
     console.log(layer_stream)
     
    var area = d3.area()
        .x(function(d) { return x(d.data.date)})
        .y1(function(d) {console.log(y(d[0]));return y([0]);})
        .y0(function(d) {return y(d.data.price)});
    
    var svgs = svg.selectAll(".stream")
        .data(layer_stream)
        .enter().append("path")
        .attr("class","area")
            .attr("d", function(d) { return area(d);})
            .attr("fill", function(d,i) {return c(d.key);})
            .attr("opacity", 0.6)
}
​
function drawallarea(){
    // create areas
     var area = d3.area()
      .x(function(d) { return x(d.date); })
      .y0(height)
      .y1(function(d) { return y(d.price); });    
        
   //create divs for the areas
    var svgs= svg.selectAll(".symbols").data(symbols).enter().append("path")
      .attr("class", "area")
      .attr("d", function(d) { return area(d.values); })
      .attr("fill", function(d) {return c(d.key);})
      .attr("opacity","0.8");
}
    
 function drawareas(){
   // create areas
            var area = d3.area()
      .x(function(d) { return x(d.date); })
      .y0(height/4)
      .y1(function(d) { return y(d.price)/4; });        
   //create divs for the areas
    var svgs= d3.selectAll(".symbols")
      .data(symbols)
    .enter().append("svg")
      .attr("width", width +margin.right+margin.left)
      .attr("height", height/4 )
    .append("g")
      .attr("transform", "translate("+margin.left+","+margin.top+")");
    
   // fill the areas
    svgs.append("path")
      .attr("class", "areas")
      .attr("d", function(d) {y.domain([0, d.maxPrice]); return area(d.values); })
      .attr("fill", function(d) {return c(d.key);})
      .attr("opacity",1.0);
   
 } 
    
    
   
   function drawlines(){
        
     //creates divs fot texts and lines 
     var lines=svg.selectAll(".symbols").data(symbols).enter().append("path")
     var texts=svg.selectAll(".symbols").data(symbols).enter().append("text");
     
     // get the lines points
     lines
                .attr("class", "line")
          .attr("d", function(d) { return line(d.values); })
          .style("stroke", function(d) { return c(d.key); });
      
     // draw the texts 
            texts
      .attr("x", x(x.domain()[1])+5)
      .attr("y", function(d){return y(d.maxPrice);})
      .attr("dy", ".35em")
      .style("text-anchor", "start")
      .text(function(d) { return d.key; });
   }
​
​
  });
    
  </script>
</body>
​
    