D3 Examples - Blocks by Reason

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<!DOCTYPE html>
<meta charset="utf-8">
<html>
  <head>
​
<script src="https://d3js.org/d3.v3.js"></script>
  <link rel="stylesheet" type="text/css" href="style.css" />
     <div id="header">Blocks by Reason  
        <br>Through February 15, 2013</div>
   <div id="sara">Sara Quigley</div>
  </head>
  <body> 
    <script type="text/javascript">
​
var m = [0, 85, 30, 20],
    w = 1400 - m[1] - m[3],
    h = 100 - m[0] - m[2],
    parse = d3.time.format("%m/%d/%y").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(10)
    .tickPadding(5)
    .orient("bottom");
​
// 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);
​
​
d3.csv("data.csv", function(data) {
​
  // Nest values by symbol.
  var symbols = d3.nest()
      .key(function(d) { return d.key + " blocks"; })
      .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.value = +d.value; d.maxBlocks = d3.max(s.values, function(d) { return +d.value; })});
  });
​
  // 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);
​
// Y-axis.
var yAxis = d3.svg.axis()
    .scale(y)
    .orient("right");   
    
  // Add the y-axis
  svg.append("g")
      .attr("class", "y axis")
      .attr("transform", "translate(" + w + ",0)");
​
  // 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 block reason.
  svg.append("text")
      .attr("x", w - 6)
      .attr("y", 36)
      .attr("text-anchor", "end")
      .attr("class", "blockReason")
      .text(function(d) { return d.key; });
      
  // Add a label for the max blocks.
  svg.append("text")
      .attr("x", w - 6)
      .attr("y", 20)
      .attr("text-anchor", "end")
      .attr("class", "maxBlocks")
      .text(function(d) { return d.values[0].maxBlocks ; });
      
            
​
//transition to actual graphs
    area.y1(function(d) { return y(d.value); });
    line.y(function(d) { return y(d.value); });
​
  
    d3.selectAll("path.line")
        .attr("d", function(d) { y.domain([0, d.values[0].maxBlocks]); return line(d.values); });
​
    d3.selectAll("path.area")
        .attr("d", function(d) { y.domain([0, d.values[0].maxBlocks]); return area(d.values); });
​
});
​
    </script>
  </body>
</html>
    