D3 Examples - Inflation adjuster

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<!DOCTYPE html>
<meta charset="utf-8">
<style>
​
svg {
  overflow: visible;
}
​
g {
  pointer-events: all;
  font: 10px sans-serif;
}
​
.bar {
  fill: steelblue;
}
​
.bar:hover {
  fill: brown;
}
​
.axis {
  font: 10px sans-serif;
}
​
.axis path,
.axis line {
  fill: none;
  stroke: #000;
  shape-rendering: crispEdges;
}
​
.x.axis path {
  display: none;
}
​
</style>
<body>
​
<script src="d3.min.js"></script>
<script src="d3-jetpack.js"></script>
<script src="https://d3js.org/queue.v1.min.js"></script>
​
<script>
​
var margin = {top: 20, right: 20, bottom: 30, left: 85},
    width = 960 - margin.left - margin.right,
    height = 500 - margin.top - margin.bottom;
​
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")
    .ticks(10, "$,");
​
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 + ")");
​
svg.append("rect")
  .attr('class', 'click-capture')
  .style('visibility', 'hidden')
  .attr('x', -margin.left)
  .attr('y', -margin.top)
  .attr('width', width + margin.left + margin.right)
  .attr('height', height + margin.top + margin.bottom);
​
var title = svg.append("text")
  .attr("dx", "1em")
  .attr("dy", "1em")
  .text("Hollywood annual box office grosses, nominal USD");
​
queue()
    .defer(d3.tsv, "boxoffice.tsv", dataType)
    .defer(d3.tsv, "cpi.tsv", indexType)
    .await(render);
​
function render(error, data, index) {
  if (error) throw error;
​
  data.sort(function(a,b) { return a.year - b.year; });
​
  x.domain(d3.extent(data, function(d) { return d.year; }));
  y.domain([0, d3.max(data, function(d) { return d.totalgross; })]);
​
  index = indexer(index);
​
  var maxRatio = d3.max(index.domain().map(function(year) { 
    var extent = d3.extent(data, ƒ('year'));
    return year >= extent[0] && year <= extent[1] ? 1 / index(year) : false; 
  }));
​
  var inflation = d3.scale.linear()
    .range([0, width / data.length])
    .domain([0, maxRatio]);
​
  svg.append("g")
      .attr("class", "x axis")
      .attr("transform", "translate(0," + height + ")")
      .call(xAxis);
​
  svg.append("g")
      .attr("class", "y axis")
      .call(yAxis);
​
  svg.selectAll(".bar")
      .data(data)
    .enter().append("rect")
      .attr("class", "bar")
      .attr("x", function(d) { return x(d.year); })
      .attr("width", function(d) { return inflation(1 / index(d.year)); })
      .attr("y", function(d) { return y(d.totalgross); })
      .attr("height", function(d) { return height - y(d.totalgross); });
​
  svg
    .on("mousemove", scrub)
    .on("touchmove", scrub)
    .on("mouseleave", reset)
    .on("touchend", reset);
​
  function scrub() {
    var date = d3.touch(this) 
      ? x.invert(d3.touch(this))[0] 
      : x.invert(d3.mouse(this)[0]);
​
    svg.selectAll(".bar")
      .transition()
      .ease("linear")
      .duration(100)
      .attr("width", function(d) { return inflation(1 / index(date)); })
      .attr("y", function(d) { return y(d.totalgross * (index(date) / index(d.year))); })
      .attr("height", function(d) { return height - y(d.totalgross * (index(date) / index(d.year))); })
​
    title.text("Hollywood annual box office grosses, real " + date.getFullYear() + " USD");
  }
​
  function reset() {
    title.text("Hollywood annual box office grosses, nominal USD");
      svg.selectAll(".bar")
        .transition()
        .attr("width", function(d) { return inflation(1 / index(d.year)); })
        .attr("y", function(d) { return y(d.totalgross); })
        .attr("height", function(d) { return height - y(d.totalgross); });
  }
​
}
​
function dataType(d) {
  d.year = new Date(d.year);
  d.totalgross = +d.totalgross;
  return d;
}
​
function indexType(d) {
  d.date = new Date(d.year)
  d.average = +d.average;
  return d;
}
​
function indexer(index) {
  return d3.scale.linear()
    .domain(index.map(ƒ('date')))
    .range(index.map(ƒ('average')));
}
​
</script>
    