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<!DOCTYPE html> |
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<meta charset="utf-8"> |
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<style> |
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svg { |
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font: 12px sans-serif; |
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font-weight: bold; |
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} |
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.y.axis path { |
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display: none; |
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} |
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.y.axis line { |
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stroke: #fff; |
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stroke-opacity: .2; |
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shape-rendering: crispEdges; |
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} |
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.y.axis .zero line { |
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stroke: #000; |
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stroke-opacity: 1; |
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} |
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.title { |
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font: 300 78px Helvetica Neue; |
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fill: #666; |
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} |
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.subtitle { |
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fill: #9E9E9E; |
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text-anchor: right; |
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} |
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.birthyear, |
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.age { |
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text-anchor: middle; |
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} |
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.birthyear { |
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fill: #fff; |
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font: 10px; |
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font-weight: normal; |
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} |
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rect { |
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fill-opacity: .6; |
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fill: #E91E63; |
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} |
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rect:first-child { |
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fill: #2196F3; |
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} |
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</style> |
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<body> |
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<script src="http://d3js.org/d3.v3.min.js"></script> |
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<script> |
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function addCommas(nStr) { |
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nStr += ''; |
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n = nStr.split('.'); |
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x1 = n[0]; |
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x2 = n.length > 1 ? '.' + n[1] : ''; |
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var rgx = /(\d+)(\d{3})/; |
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while (rgx.test(x1)) { |
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x1 = x1.replace(rgx, '$1' + ',' + '$2'); |
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} |
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return x1 + x2; |
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} |
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var margin = {top: 20, right: 40, bottom: 30, left: 20}, |
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width = 960 - margin.left - margin.right, |
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height = 500 - margin.top - margin.bottom, |
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barWidth = Math.floor(width / 19) - 1; |
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var x = d3.scale.linear() |
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.range([barWidth / 2, width - barWidth / 2]); |
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var y = d3.scale.linear() |
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.range([height, 0]); |
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var yAxis = d3.svg.axis() |
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.scale(y) |
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.orient("right") |
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.tickSize(-width) |
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// An SVG element with a bottom-right origin. |
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var svg = d3.select("body").append("svg") |
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.attr("width", width + margin.left + margin.right) |
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.attr("height", height + margin.top + margin.bottom) |
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.append("g") |
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.attr("transform", "translate(" + margin.left + "," + margin.top + ")"); |
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// A sliding container to hold the bars by birthyear. |
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var birthyears = svg.append("g") |
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.attr("class", "birthyears"); |
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// A label for the current year. |
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var title = svg.append("text") |
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.attr("class", "title") |
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.attr("dy", ".71em") |
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.attr("x", width - 200) |
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.text(2016); |
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d3.csv("population.csv", function(error, data) { |
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// Convert strings to numbers. |
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data.forEach(function(d) { |
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d.people = +d.people; |
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d.year = +d.year; |
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d.age = +d.age; |
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}); |
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// Compute the extent of the data set in age and years. |
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var age1 = d3.max(data, function(d) { return d.age; }), |
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year0 = d3.min(data, function(d) { return d.year; }), |
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year1 = d3.max(data, function(d) { return d.year; }), |
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year = year0; |
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// Update the scale domains. |
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x.domain([year0, year0 - age1]); |
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y.domain([0, d3.max(data, function(d) { return d.people; })]); |
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var population = d3.nest() |
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.key(function(d) { return d.year; }) |
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.rollup(function(v) { return { |
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male: d3.sum(v, function(d) { return (d.sex == 1) ? (d.people) : null ; } ), |
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female: d3.sum(v, function(d) { return (d.sex == 2) ? (d.people) : null ; } ), |
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total: d3.sum(v, function(d) { return d.people; }) |
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}; }) |
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.map(data); |
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console.log(population); |
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// Produce a map from year and birthyear to [male, female]. |
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data = d3.nest() |
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.key(function(d) { return d.year; }) |
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.key(function(d) { return d.year - d.age; }) |
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.rollup(function(v) { return v.map(function(d) { return d.people; }); }) |
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.map(data); |
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// Add an axis to show the population values. |
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svg.append("g") |
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.attr("class", "y axis") |
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.attr("transform", "translate(" + width + ",0)") |
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.call(yAxis) |
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.selectAll("g") |
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.filter(function(value) { return !value; }) |
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.classed("zero", true); |
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// Add labeled rects for each birthyear (so that no enter or exit is required). |
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var birthyear = birthyears.selectAll(".birthyear") |
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.data(d3.range(year0 - age1, year1 + 1, 5)) |
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.enter().append("g") |
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.attr("class", "birthyear") |
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.attr("transform", function(birthyear) { return "translate(" + x(birthyear) + ",0)"; }); |
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birthyear.selectAll("rect") |
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.data(function(birthyear) { return data[year][birthyear] || [0, 0]; }) |
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.enter().append("rect") |
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.attr("x", -barWidth / 2) |
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.attr("width", barWidth) |
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.attr("y", y) |
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.attr("height", function(value) { return height - y(value); }); |
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// Add labels to show birthyear. |
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birthyear.append("text") |
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.attr("y", height - 4) |
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.text(function(birthyear) { return birthyear; }); |
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// Add labels to show age (separate; not animated). |
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svg.selectAll(".age") |
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.data(d3.range(0, age1 + 1, 5)) |
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.enter().append("text") |
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.attr("class", "age") |
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.attr("x", function(age) { return x(year - age); }) |
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.attr("y", height + 4) |
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.attr("dy", ".71em") |
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.text(function(age) { return (age === age1) ? (age1 + "+") : (age + "-" + (age + 5));}); |
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// A label for the total population in the current year |
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var subtitle = svg.append("text") |
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.attr("class", "subtitle") |
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.attr("dy", ".50em") |
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.attr("x", width - 200) |
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.attr("y", 78) |
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.text("Total: " + addCommas(population[year].total)); |
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// Allow the arrow keys to change the displayed year. |
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window.focus(); |
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d3.select(window).on("keydown", function() { |
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switch (d3.event.keyCode) { |
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case 37: year = Math.max(year0, year - 5); break; |
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case 39: year = Math.min(year1, year + 5); break; |
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} |
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update(); |
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}); |
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function update() { |
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if (!(year in data)) return; |
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title.text(year); |
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if (year !== year0) { |
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subtitle.text("Total: " + addCommas(population[year].total) + " (5-year growth: " + addCommas(population[year].total - population[(year - 5)].total) + ")"); |
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} else { |
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subtitle.text("Total: " + addCommas(population[year].total)); |
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} |
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birthyears.transition() |
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.duration(750) |
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.attr("transform", "translate(" + (x(year0) - x(year)) + ",0)"); |
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birthyear.selectAll("rect") |
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.data(function(birthyear) { return data[year][birthyear] || [0, 0]; }) |
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.transition() |
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.duration(750) |
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.attr("y", y) |
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.attr("height", function(value) { return height - y(value); }); |
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} |
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}); |
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</script> |
