Knight course Module 4: bar chart with axes

car-bars2.js

/* global colorbrewer */

// lots of global variables...

// dimensions and elements
var margins, svgW, svgH, chartW, chartH, svg, chartG;

// scales, formatters, and axes
var xScale, yScale, colorScale, xAxis, yAxis, parseDate;

// vars
var graphedVar, baseColors, cars, colorLookup = {};

// generators
var lineGen;

function setupDimensions() {
  var body = document.getElementsByTagName('body')[0];
  var dims = body.getBoundingClientRect();

  svgW = Math.round(dims.width * 0.8);
  svgH = Math.round(dims.height * 0.7);

  margins = {
    top: 20,
    right: 20,
    bottom: 30,
    left: 120
  };

  chartW = svgW - margins.right - margins.left;
  chartH = svgH - margins.top - margins.bottom;
}

function setupVars() {
  graphedVar = 'length';
  baseColors = [
    colorbrewer.Reds,
    colorbrewer.Greens,
    colorbrewer.Blues,
    colorbrewer.Purples,
    colorbrewer.Greys
  ];
}

function setupSvg() {
  svg = d3.select('svg.cars')
    .attr('height', svgH)
    .attr('width', svgW);

  chartG = svg.append('g')
    .attr('transform', 'translate(' + margins.left + ',' + margins.top + ')')
    .attr('height', chartH)
    .attr('width', chartW);
}

function setupScalesEtc() {
  xScale = d3.scale.linear()
    .range([0, chartW]);

  yScale = d3.scale.ordinal()
    .rangeRoundBands([0, chartH], 0.1);

  colorScale = d3.scale.ordinal();
}

function setupFormatters() {
  parseDate = d3.time.format('%Y').parse;
}

function setupAxes() {
  xAxis = d3.svg.axis()
    .scale(xScale)
    .orient('bottom');

  yAxis = d3.svg.axis()
    .scale(yScale)
    .outerTickSize(0)
    .orient('left');
}

function processData(data) {
  var obj = _.chain(data)
    .groupBy(function(car) {
      return car.make + ' ' + car.model + ' ' + car.style;
    })
    .map(function(groupArr, key) {
      var recent = _.max(groupArr, 'year');
      return _.extend(recent, {name: key});
    })
    .value();

  return obj;

}

function refineScalesEtc(cars) {
  var xMax = d3.max(cars, function(d) {
    return d[graphedVar];
  });
  xScale.domain([0, xMax])
    .nice();

  yScale.domain(_.map(cars, function(d) {
    return d.name;
  }));

  var grouped = _.groupBy(cars, 'make');
  var colorRange = [], carDomain = [];
  var i = 0;
  _.each(grouped, function(makeGroup) {
    var numModels = makeGroup.length;
    var ramp;
    if (numModels < 3) {
      ramp = baseColors[i][4];
    } else if (numModels < 8) {
      ramp = baseColors[i][numModels + 3];
    } else {
      console.warn('might be too many models for color ramp');
      ramp = baseColors[i][9];
    }
    _.each(makeGroup, function(model, j) {
      colorRange.push(ramp[ramp.length - j - 1]);
      carDomain.push(model.name);
    });
    i++;
  });
  colorScale.domain(carDomain)
    .range(colorRange);
}

function drawChart() {
  var carsG = chartG.selectAll('g.cars')
    .data(cars)
    .enter()
    .append('g')
    .attr('class', 'cars');

  carsG.append('rect')
    .attr('class', 'bar')
    .attr('width', function(d) {
      return xScale(d[graphedVar]);
    })
    .attr('height', yScale.rangeBand())
    .attr('y', function(d) {
      return yScale(d.name);
    })
    .attr('fill', function(d) {
      return colorScale(d.name);
    });
}

function drawLabels() {
  var carsG = chartG.selectAll('g.cars')
    .append('text')
    .text(function(d) {
      return d.year;
    })
    .attr('x', function(d) {
      return xScale(d[graphedVar]) - 30;
    })
    .attr('y', function(d) {
      return yScale(d.name) + yScale.rangeBand() / 2 + 4;
    })
    .attr('class', 'white');
}


function drawAxes() {
  chartG.append('g')
    .attr('class', 'x axis')
    .attr('transform', 'translate(0,' + chartH + ')')
    .call(xAxis);

  chartG.append('g')
    .attr('class', 'y axis')
    .call(yAxis);
}

function drawTitle() {
  svg.append('text')
    .text('Charting most recent model year car ' + graphedVar)
    .attr('y', 16)
    .attr('x', chartW / 2)
    .attr('text-anchor', 'middle')
    .attr('class', 'title');
}

function createChart(data) {
  cars = _.sortBy(processData(data), graphedVar);
  refineScalesEtc(cars);
  drawChart();
  drawLabels();
  drawTitle();
  drawAxes();
}


// actually call the functions
setupDimensions();
setupVars();
setupSvg();
setupScalesEtc();
setupAxes();
setupFormatters();

// get data
d3.csv('carspecs.csv', createChart);

carspecs.csv

colorbrewer.js

// This product includes color specifications and designs developed by Cynthia Brewer (http://colorbrewer.org/).
// JavaScript specs as packaged in the D3 library (d3js.org). Please see license at http://colorbrewer.org/export/LICENSE.txt
var colorbrewer = {YlGn: {
3: ["#f7fcb9","#addd8e","#31a354"],
4: ["#ffffcc","#c2e699","#78c679","#238443"],
5: ["#ffffcc","#c2e699","#78c679","#31a354","#006837"],
6: ["#ffffcc","#d9f0a3","#addd8e","#78c679","#31a354","#006837"],
7: ["#ffffcc","#d9f0a3","#addd8e","#78c679","#41ab5d","#238443","#005a32"],
8: ["#ffffe5","#f7fcb9","#d9f0a3","#addd8e","#78c679","#41ab5d","#238443","#005a32"],
9: ["#ffffe5","#f7fcb9","#d9f0a3","#addd8e","#78c679","#41ab5d","#238443","#006837","#004529"]
},YlGnBu: {
3: ["#edf8b1","#7fcdbb","#2c7fb8"],
4: ["#ffffcc","#a1dab4","#41b6c4","#225ea8"],
5: ["#ffffcc","#a1dab4","#41b6c4","#2c7fb8","#253494"],
6: ["#ffffcc","#c7e9b4","#7fcdbb","#41b6c4","#2c7fb8","#253494"],
7: ["#ffffcc","#c7e9b4","#7fcdbb","#41b6c4","#1d91c0","#225ea8","#0c2c84"],
8: ["#ffffd9","#edf8b1","#c7e9b4","#7fcdbb","#41b6c4","#1d91c0","#225ea8","#0c2c84"],
9: ["#ffffd9","#edf8b1","#c7e9b4","#7fcdbb","#41b6c4","#1d91c0","#225ea8","#253494","#081d58"]
},GnBu: {
3: ["#e0f3db","#a8ddb5","#43a2ca"],
4: ["#f0f9e8","#bae4bc","#7bccc4","#2b8cbe"],
5: ["#f0f9e8","#bae4bc","#7bccc4","#43a2ca","#0868ac"],
6: ["#f0f9e8","#ccebc5","#a8ddb5","#7bccc4","#43a2ca","#0868ac"],
7: ["#f0f9e8","#ccebc5","#a8ddb5","#7bccc4","#4eb3d3","#2b8cbe","#08589e"],
8: ["#f7fcf0","#e0f3db","#ccebc5","#a8ddb5","#7bccc4","#4eb3d3","#2b8cbe","#08589e"],
9: ["#f7fcf0","#e0f3db","#ccebc5","#a8ddb5","#7bccc4","#4eb3d3","#2b8cbe","#0868ac","#084081"]
},BuGn: {
3: ["#e5f5f9","#99d8c9","#2ca25f"],
4: ["#edf8fb","#b2e2e2","#66c2a4","#238b45"],
5: ["#edf8fb","#b2e2e2","#66c2a4","#2ca25f","#006d2c"],
6: ["#edf8fb","#ccece6","#99d8c9","#66c2a4","#2ca25f","#006d2c"],
7: ["#edf8fb","#ccece6","#99d8c9","#66c2a4","#41ae76","#238b45","#005824"],
8: ["#f7fcfd","#e5f5f9","#ccece6","#99d8c9","#66c2a4","#41ae76","#238b45","#005824"],
9: ["#f7fcfd","#e5f5f9","#ccece6","#99d8c9","#66c2a4","#41ae76","#238b45","#006d2c","#00441b"]
},PuBuGn: {
3: ["#ece2f0","#a6bddb","#1c9099"],
4: ["#f6eff7","#bdc9e1","#67a9cf","#02818a"],
5: ["#f6eff7","#bdc9e1","#67a9cf","#1c9099","#016c59"],
6: ["#f6eff7","#d0d1e6","#a6bddb","#67a9cf","#1c9099","#016c59"],
7: ["#f6eff7","#d0d1e6","#a6bddb","#67a9cf","#3690c0","#02818a","#016450"],
8: ["#fff7fb","#ece2f0","#d0d1e6","#a6bddb","#67a9cf","#3690c0","#02818a","#016450"],
9: ["#fff7fb","#ece2f0","#d0d1e6","#a6bddb","#67a9cf","#3690c0","#02818a","#016c59","#014636"]
},PuBu: {
3: ["#ece7f2","#a6bddb","#2b8cbe"],
4: ["#f1eef6","#bdc9e1","#74a9cf","#0570b0"],
5: ["#f1eef6","#bdc9e1","#74a9cf","#2b8cbe","#045a8d"],
6: ["#f1eef6","#d0d1e6","#a6bddb","#74a9cf","#2b8cbe","#045a8d"],
7: ["#f1eef6","#d0d1e6","#a6bddb","#74a9cf","#3690c0","#0570b0","#034e7b"],
8: ["#fff7fb","#ece7f2","#d0d1e6","#a6bddb","#74a9cf","#3690c0","#0570b0","#034e7b"],
9: ["#fff7fb","#ece7f2","#d0d1e6","#a6bddb","#74a9cf","#3690c0","#0570b0","#045a8d","#023858"]
},BuPu: {
3: ["#e0ecf4","#9ebcda","#8856a7"],
4: ["#edf8fb","#b3cde3","#8c96c6","#88419d"],
5: ["#edf8fb","#b3cde3","#8c96c6","#8856a7","#810f7c"],
6: ["#edf8fb","#bfd3e6","#9ebcda","#8c96c6","#8856a7","#810f7c"],
7: ["#edf8fb","#bfd3e6","#9ebcda","#8c96c6","#8c6bb1","#88419d","#6e016b"],
8: ["#f7fcfd","#e0ecf4","#bfd3e6","#9ebcda","#8c96c6","#8c6bb1","#88419d","#6e016b"],
9: ["#f7fcfd","#e0ecf4","#bfd3e6","#9ebcda","#8c96c6","#8c6bb1","#88419d","#810f7c","#4d004b"]
},RdPu: {
3: ["#fde0dd","#fa9fb5","#c51b8a"],
4: ["#feebe2","#fbb4b9","#f768a1","#ae017e"],
5: ["#feebe2","#fbb4b9","#f768a1","#c51b8a","#7a0177"],
6: ["#feebe2","#fcc5c0","#fa9fb5","#f768a1","#c51b8a","#7a0177"],
7: ["#feebe2","#fcc5c0","#fa9fb5","#f768a1","#dd3497","#ae017e","#7a0177"],
8: ["#fff7f3","#fde0dd","#fcc5c0","#fa9fb5","#f768a1","#dd3497","#ae017e","#7a0177"],
9: ["#fff7f3","#fde0dd","#fcc5c0","#fa9fb5","#f768a1","#dd3497","#ae017e","#7a0177","#49006a"]
},PuRd: {
3: ["#e7e1ef","#c994c7","#dd1c77"],
4: ["#f1eef6","#d7b5d8","#df65b0","#ce1256"],
5: ["#f1eef6","#d7b5d8","#df65b0","#dd1c77","#980043"],
6: ["#f1eef6","#d4b9da","#c994c7","#df65b0","#dd1c77","#980043"],
7: ["#f1eef6","#d4b9da","#c994c7","#df65b0","#e7298a","#ce1256","#91003f"],
8: ["#f7f4f9","#e7e1ef","#d4b9da","#c994c7","#df65b0","#e7298a","#ce1256","#91003f"],
9: ["#f7f4f9","#e7e1ef","#d4b9da","#c994c7","#df65b0","#e7298a","#ce1256","#980043","#67001f"]
},OrRd: {
3: ["#fee8c8","#fdbb84","#e34a33"],
4: ["#fef0d9","#fdcc8a","#fc8d59","#d7301f"],
5: ["#fef0d9","#fdcc8a","#fc8d59","#e34a33","#b30000"],
6: ["#fef0d9","#fdd49e","#fdbb84","#fc8d59","#e34a33","#b30000"],
7: ["#fef0d9","#fdd49e","#fdbb84","#fc8d59","#ef6548","#d7301f","#990000"],
8: ["#fff7ec","#fee8c8","#fdd49e","#fdbb84","#fc8d59","#ef6548","#d7301f","#990000"],
9: ["#fff7ec","#fee8c8","#fdd49e","#fdbb84","#fc8d59","#ef6548","#d7301f","#b30000","#7f0000"]
},YlOrRd: {
3: ["#ffeda0","#feb24c","#f03b20"],
4: ["#ffffb2","#fecc5c","#fd8d3c","#e31a1c"],
5: ["#ffffb2","#fecc5c","#fd8d3c","#f03b20","#bd0026"],
6: ["#ffffb2","#fed976","#feb24c","#fd8d3c","#f03b20","#bd0026"],
7: ["#ffffb2","#fed976","#feb24c","#fd8d3c","#fc4e2a","#e31a1c","#b10026"],
8: ["#ffffcc","#ffeda0","#fed976","#feb24c","#fd8d3c","#fc4e2a","#e31a1c","#b10026"],
9: ["#ffffcc","#ffeda0","#fed976","#feb24c","#fd8d3c","#fc4e2a","#e31a1c","#bd0026","#800026"]
},YlOrBr: {
3: ["#fff7bc","#fec44f","#d95f0e"],
4: ["#ffffd4","#fed98e","#fe9929","#cc4c02"],
5: ["#ffffd4","#fed98e","#fe9929","#d95f0e","#993404"],
6: ["#ffffd4","#fee391","#fec44f","#fe9929","#d95f0e","#993404"],
7: ["#ffffd4","#fee391","#fec44f","#fe9929","#ec7014","#cc4c02","#8c2d04"],
8: ["#ffffe5","#fff7bc","#fee391","#fec44f","#fe9929","#ec7014","#cc4c02","#8c2d04"],
9: ["#ffffe5","#fff7bc","#fee391","#fec44f","#fe9929","#ec7014","#cc4c02","#993404","#662506"]
},Purples: {
3: ["#efedf5","#bcbddc","#756bb1"],
4: ["#f2f0f7","#cbc9e2","#9e9ac8","#6a51a3"],
5: ["#f2f0f7","#cbc9e2","#9e9ac8","#756bb1","#54278f"],
6: ["#f2f0f7","#dadaeb","#bcbddc","#9e9ac8","#756bb1","#54278f"],
7: ["#f2f0f7","#dadaeb","#bcbddc","#9e9ac8","#807dba","#6a51a3","#4a1486"],
8: ["#fcfbfd","#efedf5","#dadaeb","#bcbddc","#9e9ac8","#807dba","#6a51a3","#4a1486"],
9: ["#fcfbfd","#efedf5","#dadaeb","#bcbddc","#9e9ac8","#807dba","#6a51a3","#54278f","#3f007d"]
},Blues: {
3: ["#deebf7","#9ecae1","#3182bd"],
4: ["#eff3ff","#bdd7e7","#6baed6","#2171b5"],
5: ["#eff3ff","#bdd7e7","#6baed6","#3182bd","#08519c"],
6: ["#eff3ff","#c6dbef","#9ecae1","#6baed6","#3182bd","#08519c"],
7: ["#eff3ff","#c6dbef","#9ecae1","#6baed6","#4292c6","#2171b5","#084594"],
8: ["#f7fbff","#deebf7","#c6dbef","#9ecae1","#6baed6","#4292c6","#2171b5","#084594"],
9: ["#f7fbff","#deebf7","#c6dbef","#9ecae1","#6baed6","#4292c6","#2171b5","#08519c","#08306b"]
},Greens: {
3: ["#e5f5e0","#a1d99b","#31a354"],
4: ["#edf8e9","#bae4b3","#74c476","#238b45"],
5: ["#edf8e9","#bae4b3","#74c476","#31a354","#006d2c"],
6: ["#edf8e9","#c7e9c0","#a1d99b","#74c476","#31a354","#006d2c"],
7: ["#edf8e9","#c7e9c0","#a1d99b","#74c476","#41ab5d","#238b45","#005a32"],
8: ["#f7fcf5","#e5f5e0","#c7e9c0","#a1d99b","#74c476","#41ab5d","#238b45","#005a32"],
9: ["#f7fcf5","#e5f5e0","#c7e9c0","#a1d99b","#74c476","#41ab5d","#238b45","#006d2c","#00441b"]
},Oranges: {
3: ["#fee6ce","#fdae6b","#e6550d"],
4: ["#feedde","#fdbe85","#fd8d3c","#d94701"],
5: ["#feedde","#fdbe85","#fd8d3c","#e6550d","#a63603"],
6: ["#feedde","#fdd0a2","#fdae6b","#fd8d3c","#e6550d","#a63603"],
7: ["#feedde","#fdd0a2","#fdae6b","#fd8d3c","#f16913","#d94801","#8c2d04"],
8: ["#fff5eb","#fee6ce","#fdd0a2","#fdae6b","#fd8d3c","#f16913","#d94801","#8c2d04"],
9: ["#fff5eb","#fee6ce","#fdd0a2","#fdae6b","#fd8d3c","#f16913","#d94801","#a63603","#7f2704"]
},Reds: {
3: ["#fee0d2","#fc9272","#de2d26"],
4: ["#fee5d9","#fcae91","#fb6a4a","#cb181d"],
5: ["#fee5d9","#fcae91","#fb6a4a","#de2d26","#a50f15"],
6: ["#fee5d9","#fcbba1","#fc9272","#fb6a4a","#de2d26","#a50f15"],
7: ["#fee5d9","#fcbba1","#fc9272","#fb6a4a","#ef3b2c","#cb181d","#99000d"],
8: ["#fff5f0","#fee0d2","#fcbba1","#fc9272","#fb6a4a","#ef3b2c","#cb181d","#99000d"],
9: ["#fff5f0","#fee0d2","#fcbba1","#fc9272","#fb6a4a","#ef3b2c","#cb181d","#a50f15","#67000d"]
},Greys: {
3: ["#f0f0f0","#bdbdbd","#636363"],
4: ["#f7f7f7","#cccccc","#969696","#525252"],
5: ["#f7f7f7","#cccccc","#969696","#636363","#252525"],
6: ["#f7f7f7","#d9d9d9","#bdbdbd","#969696","#636363","#252525"],
7: ["#f7f7f7","#d9d9d9","#bdbdbd","#969696","#737373","#525252","#252525"],
8: ["#ffffff","#f0f0f0","#d9d9d9","#bdbdbd","#969696","#737373","#525252","#252525"],
9: ["#ffffff","#f0f0f0","#d9d9d9","#bdbdbd","#969696","#737373","#525252","#252525","#000000"]
},PuOr: {
3: ["#f1a340","#f7f7f7","#998ec3"],
4: ["#e66101","#fdb863","#b2abd2","#5e3c99"],
5: ["#e66101","#fdb863","#f7f7f7","#b2abd2","#5e3c99"],
6: ["#b35806","#f1a340","#fee0b6","#d8daeb","#998ec3","#542788"],
7: ["#b35806","#f1a340","#fee0b6","#f7f7f7","#d8daeb","#998ec3","#542788"],
8: ["#b35806","#e08214","#fdb863","#fee0b6","#d8daeb","#b2abd2","#8073ac","#542788"],
9: ["#b35806","#e08214","#fdb863","#fee0b6","#f7f7f7","#d8daeb","#b2abd2","#8073ac","#542788"],
10: ["#7f3b08","#b35806","#e08214","#fdb863","#fee0b6","#d8daeb","#b2abd2","#8073ac","#542788","#2d004b"],
11: ["#7f3b08","#b35806","#e08214","#fdb863","#fee0b6","#f7f7f7","#d8daeb","#b2abd2","#8073ac","#542788","#2d004b"]
},BrBG: {
3: ["#d8b365","#f5f5f5","#5ab4ac"],
4: ["#a6611a","#dfc27d","#80cdc1","#018571"],
5: ["#a6611a","#dfc27d","#f5f5f5","#80cdc1","#018571"],
6: ["#8c510a","#d8b365","#f6e8c3","#c7eae5","#5ab4ac","#01665e"],
7: ["#8c510a","#d8b365","#f6e8c3","#f5f5f5","#c7eae5","#5ab4ac","#01665e"],
8: ["#8c510a","#bf812d","#dfc27d","#f6e8c3","#c7eae5","#80cdc1","#35978f","#01665e"],
9: ["#8c510a","#bf812d","#dfc27d","#f6e8c3","#f5f5f5","#c7eae5","#80cdc1","#35978f","#01665e"],
10: ["#543005","#8c510a","#bf812d","#dfc27d","#f6e8c3","#c7eae5","#80cdc1","#35978f","#01665e","#003c30"],
11: ["#543005","#8c510a","#bf812d","#dfc27d","#f6e8c3","#f5f5f5","#c7eae5","#80cdc1","#35978f","#01665e","#003c30"]
},PRGn: {
3: ["#af8dc3","#f7f7f7","#7fbf7b"],
4: ["#7b3294","#c2a5cf","#a6dba0","#008837"],
5: ["#7b3294","#c2a5cf","#f7f7f7","#a6dba0","#008837"],
6: ["#762a83","#af8dc3","#e7d4e8","#d9f0d3","#7fbf7b","#1b7837"],
7: ["#762a83","#af8dc3","#e7d4e8","#f7f7f7","#d9f0d3","#7fbf7b","#1b7837"],
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},RdGy: {
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4: ["#ca0020","#f4a582","#bababa","#404040"],
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},RdYlBu: {
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},Spectral: {
3: ["#fc8d59","#ffffbf","#99d594"],
4: ["#d7191c","#fdae61","#abdda4","#2b83ba"],
5: ["#d7191c","#fdae61","#ffffbf","#abdda4","#2b83ba"],
6: ["#d53e4f","#fc8d59","#fee08b","#e6f598","#99d594","#3288bd"],
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10: ["#9e0142","#d53e4f","#f46d43","#fdae61","#fee08b","#e6f598","#abdda4","#66c2a5","#3288bd","#5e4fa2"],
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},RdYlGn: {
3: ["#fc8d59","#ffffbf","#91cf60"],
4: ["#d7191c","#fdae61","#a6d96a","#1a9641"],
5: ["#d7191c","#fdae61","#ffffbf","#a6d96a","#1a9641"],
6: ["#d73027","#fc8d59","#fee08b","#d9ef8b","#91cf60","#1a9850"],
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},Accent: {
3: ["#7fc97f","#beaed4","#fdc086"],
4: ["#7fc97f","#beaed4","#fdc086","#ffff99"],
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},Dark2: {
3: ["#1b9e77","#d95f02","#7570b3"],
4: ["#1b9e77","#d95f02","#7570b3","#e7298a"],
5: ["#1b9e77","#d95f02","#7570b3","#e7298a","#66a61e"],
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},Paired: {
3: ["#a6cee3","#1f78b4","#b2df8a"],
4: ["#a6cee3","#1f78b4","#b2df8a","#33a02c"],
5: ["#a6cee3","#1f78b4","#b2df8a","#33a02c","#fb9a99"],
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3: ["#fbb4ae","#b3cde3","#ccebc5"],
4: ["#fbb4ae","#b3cde3","#ccebc5","#decbe4"],
5: ["#fbb4ae","#b3cde3","#ccebc5","#decbe4","#fed9a6"],
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3: ["#b3e2cd","#fdcdac","#cbd5e8"],
4: ["#b3e2cd","#fdcdac","#cbd5e8","#f4cae4"],
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3: ["#e41a1c","#377eb8","#4daf4a"],
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},Set2: {
3: ["#66c2a5","#fc8d62","#8da0cb"],
4: ["#66c2a5","#fc8d62","#8da0cb","#e78ac3"],
5: ["#66c2a5","#fc8d62","#8da0cb","#e78ac3","#a6d854"],
6: ["#66c2a5","#fc8d62","#8da0cb","#e78ac3","#a6d854","#ffd92f"],
7: ["#66c2a5","#fc8d62","#8da0cb","#e78ac3","#a6d854","#ffd92f","#e5c494"],
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3: ["#8dd3c7","#ffffb3","#bebada"],
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}};

index.html

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="utf-8">
    <title>D3: bar chart with axes (centered)</title>
    <script src="//cdnjs.cloudflare.com/ajax/libs/d3/3.5.6/d3.min.js"></script>
    <script src="//cdnjs.cloudflare.com/ajax/libs/underscore.js/1.8.3/underscore-min.js"></script>
    <script src="colorbrewer.js"></script>
    <style type="text/css">
      body, html {
        box-sizing: border-box;
        width: 100%;
        height: 100%;
        margin: 0;
        padding: 20px;
        font-family: sans-serif;
      }
      svg {
        box-sizing: border-box;
        margin: 10px;
        display: block;
        background: white;
      }
      .axis path,
      .axis line {
        fill: none;
        stroke: #000;
        shape-rendering: crispEdges;
      }

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

      svg text {
        font-size: 10px;
      }
      text.white {
        fill: white;
      }
      text.title {
        font-size: 16px;
      }
    </style>
  </head>
  <body>
    <svg class="cars"></svg>
    <script type="text/javascript" src="car-bars2.js"></script>
  </body>
</html>