D3 Examples - Fall 2012 Courses w/Big Waitlists

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<!DOCTYPE html>
​
<meta charset="utf-8">
  <link rel="stylesheet" type="text/css" href="BigWaitlistTimeSeries.css" />
  <body>
    <script src='https://cdn.jsdelivr.net/npm/d3@2.10.3/d3.v2.js'></script>
     <div id="header">Fall 2012 Courses with Big Waitlists</div>
   <div id="sara">Sara Quigley</div>
    <script type="text/javascript">
​
var m = [0, 85, 30, 20],
    w = 700 - m[1] - m[3],
    h = 160 - m[0] - m[2],
    parse = d3.time.format("%B %d").parse;
​
// Scales. Note the inverted domain for the y-scale: bigger is up!
var x = d3.time.scale().range([0, w]),
    y = d3.scale.linear().range([h, 0]);
​
// X-axis.
var xAxis = d3.svg.axis()
    .scale(x)
    .tickSize(-h);
​
// An area generator, for the light fill.
var area = d3.svg.area()
    .interpolate("monotone")
    .x(function(d) { return x(d.date); })
    .y0(h)
    .y1(h);
​
// A line generator, for the dark stroke.
var line = d3.svg.line()
    .interpolate("monotone")
    .x(function(d) { return x(d.date); })
    .y(h);
​
//Adding a second line generator, for the enroll_limit
var line2 = d3.svg.line()
    .interpolate("monotone")
    .x(function(d) { return x(d.date); })
    .y(function(d) { return y(d.enrollLimit); });
    
//Adding a third line generator, for the waitlist_count
var line3 = d3.svg.line()
    .interpolate("monotone")
    .x(function(d) { return x(d.date); })
    .y(function(d) { return y(d.waitListCount) + y(d.enrollLimit); });
​
​
// Another area generator, for the waitlist count fill.
var area3 = d3.svg.area()
    .interpolate("monotone")
    .x(function(d) { return x(d.date); })
    .y0(h)
    .y1(h);
​
​
​
d3.csv("BigWaitlists_Oct14.csv", function(data) {
​
  // Nest values by symbol.
  var symbols = d3.nest()
      .key(function(d) { return d.courseNum + ": " + d.courseTitle; })
      .entries(data);
​
  // Parse dates and numbers. We assume values are sorted by date.
  // Also compute the maximum enrollment per course, needed for the y-domain.
  symbols.forEach(function(s) {
    s.values.forEach(function(d) { d.date = parse(d.date); d.enrollCount = +d.enrollCount; d.waitListCount = +d.waitListCount; d.enrollLimit = +d.enrollLimit;});
   // s.maxPercent = d3.max(s.values, function(d) { return d.percentFull; });
    s.maxEnroll = d3.max(s.values, function(d) { return +d.enrollLimit; });
    s.maxWaitlist = d3.max(s.values, function(d) { return +d.waitListCount; });
  });
​
  // Compute the minimum and maximum date across symbols.
  x.domain([
    d3.min(symbols, function(d) { return d.values[0].date; }),
    d3.max(symbols, function(d) { return d.values[d.values.length - 1].date; })
  ]);
​
​
  // Add an SVG element for each symbol, with the desired dimensions and margin.
  var svg = d3.select("body").selectAll("svg")
      .data(symbols)
    .enter().append("svg")
      .attr("width", w + m[1] + m[3])
      .attr("height", h + m[0] + m[2])
    .append("g")
      .attr("transform", "translate(" + m[3] + "," + m[0] + ")");
​
​
  // Add the area path elements. Note: the y-domain is set per element.
  svg.append("path")
      .attr("class", "area")
      .attr("d", function(d) { y.domain([0, 0]); return area(d.values); });
​
  // Add the x-axis.
  svg.append("g")
      .attr("class", "x axis")
      .attr("transform", "translate(0," + h + ")")
      .call(xAxis);
      
  // Add the waitlist area path elements. Note: the y-domain is set per element.
  svg.append("path")
      .attr("class", "area3")
      .attr("d", function(d) { y.domain([0, 0]); return area3(d.values); });
​
  // Add the waitlist line path elements. 
  svg.append("path")
      .attr("class", "waitlist")
      //.attr("y", y(function(d) { return d.enrollLimit; }))
      .attr("d", function(d) { y.domain([0,0]); return line3(d.values); });
      //.attr("transform", "translate(0," + function(d) {return d.enrollLimit;} + ")");
​
  // Add the line path elements. Note: the y-domain is set per element.
  svg.append("path")
      .attr("class", "line")
      .attr("d", function(d) { y.domain([0,0]); return line(d.values); });
      
      
  // Add a small label for the coursenum.
  svg.append("text")
      .attr("x", w - 6)
      .attr("y", 36)
      .attr("text-anchor", "end")
      .attr("class", "coursenum")
      .text(function(d) { return d.key; });
      
  //add the latest enrollment limit    
  svg.append("svg:text")
      .attr("x", w + 7)
      .attr("y", function(d) { y.domain([0, (d.maxEnroll + d.maxWaitlist)]); return y(d.maxEnroll); })
      .attr("text-anchor", "start")
      .attr("class", "full")
      .text(function(d, i) {return symbols[i].values[(symbols[i].values.length)-1].enrollLimit + "  seat limit" ;} );
      
  //add the latest enrollment count    
  svg.append("svg:text")
      .attr("x", w + 7)
      .attr("y", function(d) { y.domain([0, (d.maxEnroll + d.maxWaitlist)]); return y(d.maxEnroll); })
      .attr("transform", "translate(0, 14)")
      .attr("text-anchor", "start")
      .attr("class", "enrolled")
      .text(function(d, i) {return symbols[i].values[(symbols[i].values.length)-1].enrollCount + "  enrolled" ;} );
​
  //add the max waitlist count    
  svg.append("svg:text")
      .attr("x", w + 7)
      .attr("y", function(d) { y.domain([0, (d.maxEnroll + d.maxWaitlist)]); return y(d.maxEnroll); })
      .attr("transform", "translate(0, -14)")
      .attr("text-anchor", "start")
      .attr("class", "waitlisted")
      .text(function(d, i) {return (d.maxWaitlist - d.maxEnroll) + "  waitlist peak" ;} );
​
  // Add the enroll limit. Note: the y-domain is set per element.
  svg.append("path")
      .attr("class", "full")
      .attr("d", function(d) { y.domain([0, (d.maxEnroll + d.maxWaitlist)]); return line2(d.values); });   
​
  // Add the line path elements. Note: the y-domain is set per element.
  svg.append("svg:line")
      .attr("class", "line4")
      .attr("x1", x(parse("July 11")))
      .attr("x2", x(parse("July 11")))
      .attr("y1", h + 20)
      .attr("y2", 50);
​
  // Add the line path elements. Note: the y-domain is set per element.
  svg.append("svg:line")
      .attr("class", "line4")
      .attr("x1", x(parse("September 21")))
      .attr("x2", x(parse("September 21")))
      .attr("y1", h + 20)
      .attr("y2", 50);
      
  svg.append("svg:text")
      .attr("class", "milestones")
      .attr("x", x(parse("July 11")) + 6)
      .attr("y", h + 25)
      .attr("text-anchor", "start")
      .text("Phase 2");
​
  svg.append("svg:text")
      .attr("class", "milestones")
      .attr("x", x(parse("September 21")) + 6)
      .attr("y", h + 25)
      .attr("text-anchor", "start")
      .text("Add/Drop Deadline");
​
// Tele-BEARS Phase 1  April 9 - July 10
// Tele-BEARS Phase 2  July 12 - August 12
// Early Drop Deadline August 31
// Add Drop Deadline September 21
​
​
//transition to actual graphs
    area.y1(function(d) { return y(d.enrollCount); });
    area3.y1(function(d) { return y(d.waitListCount); });
    area3.y0(function(d) { return y(d.enrollLimit); });
    line.y(function(d) { return y(d.enrollCount); });
    line3.y(function(d) { return y(d.waitListCount); });
    line2.y(function(d) {return y(d.maxEnroll);});
​
 
  
     d3.selectAll("path.waitlist")
        .transition()
        .duration(2750)
        .delay(1500)
        .attr("d", function(d) { y.domain([0, (d.maxEnroll + d.maxWaitlist)]); return line3(d.values); });
        //.attr("transform", "translate(0, " +  function(d) { return -y(d.enrollCount);} + ")");
 
     d3.selectAll("path.area3")
        .transition()
        .duration(2750)
        .delay(1500)
        .attr("d", function(d) { y.domain([0, (d.maxEnroll + d.maxWaitlist)]); return area3(d.values) > line3(d.values) ? area3(d.values) : null; });   
    
    d3.selectAll("path.line")
        .transition()
        .duration(1750)
        .delay(500)
        .attr("d", function(d) { y.domain([0, (d.maxEnroll + d.maxWaitlist)]); return line(d.values); });
​
    d3.selectAll("path.area")
        .transition()
        .duration(1750)
        .delay(500)
        .attr("d", function(d) { y.domain([0, (d.maxEnroll + d.maxWaitlist)]); return area(d.values); });
​
​
​
});
​
    </script>
    