Updating a Diff Area Chart!

add this to F1 blog... the Mercedes pair...interval based graph showing the changes through the season...angular-izing the transitions

by Nivaldo

HTML

<div id="button">
    <input name="seine" type="button" value="Update Values" onclick="updateSeine()" />
</div>

<pre id="chingill">
Year,Pre,Post
2001,27175,38446
2002,26500,29708
2003,20750,38648
2004,25250,46617
2005,43600,39050
2006,41500,62553
2007,33480,48391
2008,10938,24624
2009,11524,26887
2010,12150,21862
2011,15258.6,0
2012,13283,21093
</pre>
<pre id="chinseine">
Year,Pre,Post
2001,0,0
2002,0,0
2003,0,24
2004,0,170
2005,20400,34
2006,7200,2039
2007,7200,1898
2008,2262,3415
2009,0,752
2010,0,38
2011,0,46071
2012,1148.8,1
</pre>


<div id="chinook"></div>

CSS

pre#chingill {display:none;}
pre#chinseine {display:none;}

body {
  font-size: 11px;
}

.axis path,
.axis line {
  fill: none;
  stroke: #000;
  shape-rendering: crispEdges;
}

.x.axis path {
  display: none;
}

.area.above {
  fill: #34738a;
}

.area.below {
  fill: #ed9026;
}

.line {
  fill: none;
  stroke-width: 1.5px;
}

JavaScript

var margin = {top: 20, right: 20, bottom: 30, left: 60},
    width = 500 - margin.left - margin.right,
    height = 250 - margin.top - margin.bottom;

var parseDate = d3.time.format("%Y").parse;

var x = d3.time.scale()
    .range([0, width]);

var y = d3.scale.linear()
    .range([height, 0]);

var xAxis = d3.svg.axis()
    .scale(x)
    .orient("bottom");

var yAxis = d3.svg.axis()
    .scale(y)
    .orient("left");

var preline = d3.svg.area()
    .interpolate("monotone")
    .x(function(d) { return x(d.date); })
    .y(function(d) { return y(d["Pre"]); });

var postline = d3.svg.area()
    .interpolate("monotone")
    .x(function(d) { return x(d.date); })
    .y(function(d) { return y(d["Post"]); });

var area = d3.svg.area()
    .interpolate("monotone")
    .x(function(d) { return x(d.date); })
    .y1(function(d) { return y(d["Pre"]); });
    
    
    ////////////////  CHINOOK  ////////////////////
    
var svgchin = d3.select("#chinook").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 + ")");

//d3.csv("chingill.csv", function(error, data) {
var data = d3.csv.parse( d3.select("pre#chingill").text() );
    
  data.forEach(function(d) {
    d.date = parseDate(d.Year);
    d["Pre"]= +d["Pre"];
    d["Post"] = +d["Post"];
  });

  x.domain(d3.extent(data, function(d) { return d.date; }));

  y.domain([
    d3.min(data, function(d) { return Math.min(d["Pre"], d["Post"]); }),
    d3.max(data, function(d) { return Math.max(d["Pre"], d["Post"]); })
  ]);

  svgchin.datum(data);

  svgchin.append("clipPath")
      .attr("id", "clip-below-chin")
    .append("path")
      .attr("d", area.y0(height));

  svgchin.append("clipPath")
      .attr("id", "clip-above-chin")
    .append("path")
      .attr("d", area.y0(0));

  svgchin.append("path")
      .attr("class", "area above")
      .attr("clip-path",...