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population-density.html
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population-density.html
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<!DOCTYPE html>
<html>
<head>
<title>Population density in France</title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=yes">
<style>
html, body, #map {
width: 100%;
height: 100%;
margin: 0;
padding: 0;
}
.stations, .stations svg {
position: absolute;
}
.stations svg {
width: 60px;
height: 20px;
padding-right: 100px;
font: 10px sans-serif;
}
.stations circle {
fill: brown;
stroke: black;
stroke-width: 1.5px;
}
</style>
</head>
<body>
<input id=dateInput type='range' min=0> <span id=dateSpan></span>
<div id="map"></div>
<script src="https://d3js.org/d3.v3.min.js"></script>
<script src="https://d3js.org/topojson.v1.min.js"></script>
<script>
// may 2015
var width = 400;
var height = 350;
/*var map = new google.maps.Map(d3.select("#map").node(), {
zoom: 8,
center: new google.maps.LatLng(37.76487, -122.41948),
mapTypeId: google.maps.MapTypeId.TERRAIN
});*/
const d3Json = url => new Promise(res => d3.json(url, (req, json) => res(json)));
var path = d3.geo.path();
var projection = d3.geo.conicConformal() // Lambert-93
.center([2.454071, 47.279229])
.scale(2000)
.translate([width / 2, height / 2]);
path.projection(projection);
load().then(({geojson, density, dates}) => {
dateInput.max = dates.length-1;
dateInput.value = dates.length-1;
var values = Object.keys(density).map(i => density[i][5]);
const color = d3.scale.log()
.domain([d3.min(values), d3.mean(values), d3.max(values)])
.range(["blue", "orange", "red"]);
/*console.log(geojson.features.map(function(i){return i.properties.CODE_DEPT}).sort())
console.log(Object.keys(density).sort())
*/
const features = d3.select('#map').append("svg")
.attr("width", width)
.attr("height", height)
.append("g")
.attr("id", "departements")
.selectAll("path")
.data(geojson.features);
features.enter()
.append("path")
.attr('class', 'departement')
.attr('fill', function(d) {
return color((density[d.properties.CODE_DEPT]||Array.from({length:dates.length},()=>0))[+dateInput.value])
})
.attr("d", path)
dateSpan.textContent = dates[+dateInput.value];
dateInput.onchange = function(e){
d3.selectAll(".departement")
.attr('fill', function(d) {
return color((density[d.properties.CODE_DEPT]||Array.from({length:dates.length},()=>0))[+dateInput.value])
});
dateSpan.textContent = dates[+dateInput.value]
}
});
function load() {
if (localStorage.caubPopulationDensity) {
var cache = JSON.parse(localStorage.caubPopulationDensity);
if (Date.now() < cache.time + 7*86.4e6) {
return Promise.resolve(cache.data);
}
}
//TODO use queue http://bl.ocks.org/mbostock/4060606
// other todo: http://zbryikt.github.io/visualize/dorling/
return Promise.all([
d3Json('https://rawgit.com/kerneis/france-choropleth/master/data/geofla/departement.json'),
fetch('https://cors-anywhere.herokuapp.com/https://fr.wikipedia.org/wiki/Liste_des_d%C3%A9partements_fran%C3%A7ais_class%C3%A9s_par_population_et_superficie').then(r => r.text())
])
.then(([geojson, text]) => {
const doc=(new DOMParser).parseFromString(text, "text/xml");
const rows = Array.from(doc.querySelectorAll('table.wikitable.sortable.alternance tr')).slice(1);
const header = rows[0];
const density = {};
const dates = Array.from(header.children, th => parseInt(th.textContent));
for (let i=1; i<rows.length; i++) {
const tr = rows[i];
const depId = tr.children[1].textContent;
const area = parseInt(tr.children[tr.childElementCount - 2].querySelector('span').textContent.replace(/\s+/g,''));
density[depId] = Array.from(tr.children).slice(3, -2).reduce((a, td) =>
a.concat(
Array.from({length:td.getAttribute('colspan')||1}, () => td.textContent ?
parseInt(td.querySelector('span').textContent.replace(/\s+/g,'')) / area :
0
)
), []
);
// note td.colSpan is undefined wit DOMParser
}
localStorage.caubPopulationDensity = JSON.stringify({time: Date.now(), data: {geojson, density, dates}});
return {geojson, density, dates};
});
}
/*
var overlay = new google.maps.OverlayView();
// Add the container when the overlay is added to the map.
overlay.onAdd = function() {
var layer = d3.select(this.getPanes().overlayLayer).append("div")
.attr("class", "stations");
overlay.draw = function() {
var features = deps
.selectAll("path")
.data(geojson.features);
var colorScale = d3.scale.category20c();
features.enter()
.append("path")
.attr('class', 'departement')
.attr('fill', function(d) {
return colorScale(+d.properties.CODE_DEPT);
})
.attr("d", path)
var projection = this.getProjection(),
padding = 10;
var marker = layer.selectAll("svg")
.data(d3.entries(data))
.each(transform) // update existing markers
.enter().append("svg:svg")
.each(transform)
.attr("class", "marker");
// Add a circle.
marker.append("svg:circle")
.attr("r", 4.5)
.attr("cx", padding)
.attr("cy", padding);
// Add a label.
marker.append("svg:text")
.attr("x", padding + 7)
.attr("y", padding)
.attr("dy", ".31em")
.text(function(d) { return d.key; });
function transform(d) {
d = new google.maps.LatLng(d.value[1], d.value[0]);
d = projection.fromLatLngToDivPixel(d);
return d3.select(this)
.style("left", (d.x - padding) + "px")
.style("top", (d.y - padding) + "px");
}
};
};
// Bind our overlay to the map
overlay.setMap(map);*/
/*fetch('https://rawgit.com/kerneis/france-choropleth/master/data/geofla/departement.json').then(r => r.json()).then(function(r){
console.log(r)
})
//https://rawgit.com/alignedleft/d3-book/master/chapter_12/us-states.json
*/
/*yql(`select * from html where url='http://fr.wikipedia.org/wiki/Liste_des_d%C3%A9partements_fran%C3%A7ais_class%C3%A9s_par_population_et_superficie'`).then(function(r){
var doc=(new DOMParser).parseFromString(r, "text/xml");
population2 = [].slice.apply(doc.querySelectorAll('table.wikitable.sortable.alternance tbody tr')).slice(1).map(function(e){
return {
id: +e.childNodes[9].innerHTML,
name: e.childNodes[1].childNodes[0].innerHTML,
pop1931: e.childNodes[2].childNodes[0].innerHTML,
pop1999: e.childNodes[3].childNodes[0].innerHTML,
pop2008: e.childNodes[4].childNodes[0].innerHTML,
pop2010: e.childNodes[5].childNodes[0].innerHTML,
pop2011: e.childNodes[6].childNodes[0].innerHTML,
area: e.childNodes[7].childNodes[0].innerHTML,
}
})
population = {};
populations2.forEach(function(o){ population[o.id]=o.pop2011 })
})
*/
</script>
</body>
</html>