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population.html
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population.html
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<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html;charset=utf-8"/>
<script type="text/javascript" src="d3/d3.js"></script>
<script type="text/javascript" src="d3/d3.csv.js"></script>
<link type="text/css" rel="stylesheet" href="style.css"/>
<style type="text/css">
svg {
font-size: 11px;
}
.rule line {
stroke: #fff;
stroke-opacity: .4;
stroke-width: .5px;
shape-rendering: crispEdges;
}
.rule:first-child line {
stroke: #000;
stroke-opacity: 1;
}
rect {
fill: none;
pointer-events: all;
}
.year rect {
fill-opacity: .6;
fill: #e377c2;
}
.year rect:first-child {
fill: #1f77b4;
}
</style>
</head>
<body>
<div id="body">
<div id="footer">
U.S. Population by Age, <span>…</span>
<div class="hint">click to change year</div>
</div>
</div>
<script type="text/javascript">
var m = [60, 120, 160, 120],
w = 1280 - m[1] - m[3],
h = 800 - m[0] - m[2],
x = d3.scale.linear().range([0, w]),
y = d3.scale.linear().range([0, h]);
// An SVG element with a bottom-right origin.
var svg = d3.select("#body").append("svg:svg")
.attr("width", w + m[1] + m[3])
.attr("height", h + m[0] + m[2])
.append("svg:g")
.attr("transform", "translate(" + (w + m[3]) + "," + (h + m[0]) + ")scale(-1,-1)");
// A sliding container to hold the bars.
var body = svg.append("svg:g")
.attr("transform", "translate(0,0)");
// A container to hold the y-axis rules.
var rules = svg.append("svg:g");
d3.csv("population.csv", function(data) {
// Convert strings to numbers.
data.forEach(function(d) {
d.people = +d.people;
d.year = +d.year;
d.age = +d.age;
});
// Compute the extent of the data set in age and years.
var age0 = 0,
age1 = d3.max(data, function(d) { return d.age; }),
year0 = d3.min(data, function(d) { return d.year; }),
year1 = d3.max(data, function(d) { return d.year; }),
year = 1930;
// Update the scale domains.
x.domain([0, age1 + 5]);
y.domain([0, d3.max(data, function(d) { return d.people; })]);
// Add rules to show the population values.
rules = rules.selectAll(".rule")
.data(y.ticks(10))
.enter().append("svg:g")
.attr("class", "rule")
.attr("transform", function(d) { return "translate(0," + y(d) + ")"; });
rules.append("svg:line")
.attr("x2", w);
rules.append("svg:text")
.attr("x", 6)
.attr("dy", ".35em")
.attr("transform", "rotate(180)")
.text(function(d) { return Math.round(d / 1e6) + "M"; });
// Add labeled rects for each birthyear.
var years = body.selectAll("g")
.data(d3.range(year0 - age1, year1 + 5, 5))
.enter().append("svg:g")
.attr("class", "year")
.attr("transform", function(d) { return "translate(" + x(year1 - d) + ",0)"; });
years.selectAll("rect")
.data(d3.range(2))
.enter().append("svg:rect")
.attr("x", 1)
.attr("width", x(5) - 2)
.attr("height", 1e-6);
years.append("svg:text")
.attr("y", -6)
.attr("x", -x(5) / 2)
.attr("transform", "rotate(180)")
.attr("text-anchor", "middle")
.style("fill", "#fff")
.text(String);
// Add labels to show the age.
svg.append("svg:g").selectAll("text")
.data(d3.range(0, age1 + 5, 5))
.enter().append("svg:text")
.attr("text-anchor", "middle")
.attr("transform", function(d) { return "translate(" + (x(d) + x(5) / 2) + ",-4)scale(-1,-1)"; })
.attr("dy", ".71em")
.text(String);
// Nest by year then birthyear.
data = d3.nest()
.key(function(d) { return d.year; })
.key(function(d) { return d.year - d.age; })
.rollup(function(v) { return v.map(function(d) { return d.people; }); })
.map(data);
redraw();
svg.append("svg:rect")
.attr("x", 0)
.attr("width", w / 2)
.attr("height", h)
.style("cursor", "e-resize")
.on("click", function() { year = Math.min(year1, year + 10); redraw(); });
svg.append("svg:rect")
.attr("x", w / 2)
.attr("width", w / 2)
.attr("height", h)
.style("cursor", "w-resize")
.on("click", function() { year = Math.max(year0, year - 10); redraw(); });
function redraw() {
if (!(year in data)) return;
d3.select("#footer span").text(year);
body.transition()
.duration(750)
.attr("transform", function(d) { return "translate(" + x(year - year1) + ",0)"; });
years.selectAll("rect")
.data(function(d) { return data[year][d] || [0, 0]; })
.transition()
.duration(750)
.attr("height", y);
}
});
</script>
</body>
</html>