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World Tour along Flying Arcs
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capitals.json
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{"type":"Feature","geometry":{"type":"Point","coordinates":[24.93218048284558,60.17750923256807]},"properties":{"name":"Helsinki","countryName":"Finland"}},
{"type":"Feature","geometry":{"type":"Point","coordinates":[12.561539888703294,55.68051004902594]},"properties":{"name":"København","countryName":"Denmark"}},
{"type":"Feature","geometry":{"type":"Point","coordinates":[-4.041994118507091,5.321942826098564]},"properties":{"name":"Abidjan","countryName":"Ivory Coast"}},
{"type":"Feature","geometry":{"type":"Point","coordinates":[-47.91799814700306,-15.781394372878992]},"properties":{"name":"Brasilia","countryName":"Brazil"}},
{"type":"Feature","geometry":{"type":"Point","coordinates":[4.33137074969045,50.83526293533032]},"properties":{"name":"Brussels","countryName":"Belgium"}},
{"type":"Feature","geometry":{"type":"Point","coordinates":[90.40663360810754,23.725005570312817]},"properties":{"name":"Dhaka","countryName":"Bangladesh"}},
{"type":"Feature","geometry":{"type":"Point","coordinates":[13.23248118266855,-8.836340255012658]},"properties":{"name":"Luanda","countryName":"Angola"}},
{"type":"Feature","geometry":{"type":"Point","coordinates":[3.048606670909237,36.765010656628135]},"properties":{"name":"Algiers","countryName":"Algeria"}},
{"type":"Feature","geometry":{"type":"Point","coordinates":[96.16473175266185,16.785299963188777]},"properties":{"name":"Rangoon","countryName":"Myanmar"}},
{"type":"Feature","geometry":{"type":"Point","coordinates":[-66.91898305105042,10.502944413033333]},"properties":{"name":"Caracas","countryName":"Venezuela"}},
{"type":"Feature","geometry":{"type":"Point","coordinates":[30.514682110472165,50.43531318760722]},"properties":{"name":"Kiev","countryName":"Ukraine"}},
{"type":"Feature","geometry":{"type":"Point","coordinates":[69.29298696088779,41.31364774160721]},"properties":{"name":"Tashkent","countryName":"Uzbekistan"}},
{"type":"Feature","geometry":{"type":"Point","coordinates":[-3.6852975446125242,40.40197212311381]},"properties":{"name":"Madrid","countryName":"Spain"}},
{"type":"Feature","geometry":{"type":"Point","coordinates":[18.095388874180912,59.35270581286585]},"properties":{"name":"Stockholm","countryName":"Sweden"}},
{"type":"Feature","geometry":{"type":"Point","coordinates":[100.51469879369489,13.751945064087977]},"properties":{"name":"Bangkok","countryName":"Thailand"}},
{"type":"Feature","geometry":{"type":"Point","coordinates":[-77.05200795343472,-12.04606681752557]},"properties":{"name":"Lima","countryName":"Peru"}},
{"type":"Feature","geometry":{"type":"Point","coordinates":[-17.47507598705056,14.717777583623274]},"properties":{"name":"Dakar","countryName":"Senegal"}},
{"type":"Feature","geometry":{"type":"Point","coordinates":[28.028063865019476,-26.16809888138414]},"properties":{"name":"Johannesburg","countryName":"South Africa"}},
{"type":"Feature","geometry":{"type":"Point","coordinates":[4.914694317400972,52.35191454666443]},"properties":{"name":"Amsterdam","countryName":"Netherlands"}},
{"type":"Feature","geometry":{"type":"Point","coordinates":[126.99778513820195,37.56829495838895]},"properties":{"name":"Seoul","countryName":"South Korea"}},
{"type":"Feature","geometry":{"type":"Point","coordinates":[120.9802713035424,14.606104813440538]},"properties":{"name":"Manila","countryName":"Philippines"}},
{"type":"Feature","geometry":{"type":"Point","coordinates":[13.399602764700546,52.523764522251156]},"properties":{"name":"Berlin","countryName":"Germany"}},
{"type":"Feature","geometry":{"type":"Point","coordinates":[15.313026023171744,-4.327778243275986]},"properties":{"name":"Kinshasa","countryName":"Congo (Kinshasa)"}},
{"type":"Feature","geometry":{"type":"Point","coordinates":[77.19998002005303,28.600023009245433]},"properties":{"name":"New Delhi","countryName":"India"}},
{"type":"Feature","geometry":{"type":"Point","coordinates":[23.731375225679358,37.98527209055226]},"properties":{"name":"Athens","countryName":"Greece"}},
{"type":"Feature","geometry":{"type":"Point","coordinates":[44.391922914564134,33.34059435615865]},"properties":{"name":"Baghdad","countryName":"Iraq"}},
{"type":"Feature","geometry":{"type":"Point","coordinates":[38.69805857534868,9.035256221295754]},"properties":{"name":"Addis Ababa","countryName":"Ethiopia"}},
{"type":"Feature","geometry":{"type":"Point","coordinates":[51.42239817500899,35.673888627001304]},"properties":{"name":"Tehran","countryName":"Iran"}},
{"type":"Feature","geometry":{"type":"Point","coordinates":[-58.399477232331435,-34.600555749907414]},"properties":{"name":"Buenos Aires","countryName":"Argentina"}},
{"type":"Feature","geometry":{"type":"Point","coordinates":[69.18131419070505,34.51863614490031]},"properties":{"name":"Kabul","countryName":"Afghanistan"}},
{"type":"Feature","geometry":{"type":"Point","coordinates":[16.364693096743736,48.20196113681686]},"properties":{"name":"Vienna","countryName":"Austria"}},
{"type":"Feature","geometry":{"type":"Point","coordinates":[121.568333333333,25.0358333333333]},"properties":{"name":"Taipei","countryName":"Taiwan"}},
{"type":"Feature","geometry":{"type":"Point","coordinates":[-77.01136443943716,38.901495235087054]},"properties":{"name":"Washington, D.C.","countryName":"United States of America"}},
{"type":"Feature","geometry":{"type":"Point","coordinates":[-0.11866770247593195,51.5019405883275]},"properties":{"name":"London","countryName":"United Kingdom"}},
{"type":"Feature","geometry":{"type":"Point","coordinates":[46.770795798688255,24.642779007816443]},"properties":{"name":"Riyadh","countryName":"Saudi Arabia"}},
{"type":"Feature","geometry":{"type":"Point","coordinates":[18.43304229922603,-33.91806510862875]},"properties":{"name":"Cape Town","countryName":"South Africa"}},
{"type":"Feature","geometry":{"type":"Point","coordinates":[37.6135769672714,55.75410998124818]},"properties":{"name":"Moscow","countryName":"Russia"}},
{"type":"Feature","geometry":{"type":"Point","coordinates":[-99.1329340602939,19.444388301415472]},"properties":{"name":"Mexico City","countryName":"Mexico"}},
{"type":"Feature","geometry":{"type":"Point","coordinates":[12.481312562873995,41.89790148509894]},"properties":{"name":"Rome","countryName":"Italy"}},
{"type":"Feature","geometry":{"type":"Point","coordinates":[116.38633982565943,39.93083808990906]},"properties":{"name":"Beijing","countryName":"China"}},
{"type":"Feature","geometry":{"type":"Point","coordinates":[36.81471100047145,-1.2814008832377795]},"properties":{"name":"Nairobi","countryName":"Kenya"}},
{"type":"Feature","geometry":{"type":"Point","coordinates":[106.82749176247012,-6.172471846798885]},"properties":{"name":"Jakarta","countryName":"Indonesia"}},
{"type":"Feature","geometry":{"type":"Point","coordinates":[-74.08528981377441,4.598369421147822]},"properties":{"name":"Bogota","countryName":"Colombia"}},
{"type":"Feature","geometry":{"type":"Point","coordinates":[31.248022361126118,30.051906205103705]},"properties":{"name":"Cairo","countryName":"Egypt"}},
{"type":"Feature","geometry":{"type":"Point","coordinates":[139.74946157054467,35.686962764371174]},"properties":{"name":"Tokyo","countryName":"Japan"}},
{"type":"Feature","geometry":{"type":"Point","coordinates":[2.33138946713035,48.86863878981461]},"properties":{"name":"Paris","countryName":"France"}},
{"type":"Feature","geometry":{"type":"Point","coordinates":[-70.66898671317483,-33.448067956934096]},"properties":{"name":"Santiago","countryName":"Chile"}},
{"type":"Feature","geometry":{"type":"Point","coordinates":[103.85387481909902,1.2949793251059418]},"properties":{"name":"Singapore","countryName":"Singapore"}}
]}
Raw
index.html
<html>
<head>
<link href="https://fonts.googleapis.com/css?family=Montserrat" rel="stylesheet">
</head>
<body>
<script src="https://d3js.org/d3.v4.min.js"></script>
<script src="https://d3js.org/topojson.v2.min.js"></script>
<script>
var oceanColor = '#f9f9f9',
landColor = '#ddd',
flyingArcColor = 'tomato',
flyingArcShadowColor = '#333',
flyingArcShadowStrokeColor = '#ccc',
cityMarkerColor = '#999',
cityLabelColor = '#666',
cityLabelShadowColor = '#eee';
var flyingArcWidth = 2,
flyingArcShadowWidth = 0.5,
flyingArcShadowOpacity = 0.5,
flyingArcShadowBlur = 5,
cityMarkerRadius = 2,
cityLabelFont = '16px "Montserrat", sans-serif',
cityLabelTextAlign = 'center',
cityLabelOffset = [0, -7],
cityLabelShadowBlur = 5,
loftedness = 1.3,
transitionDuration = 4000,
transitionEase = d3.easeQuad;
// TODO: These probably shouldn't be global
var link,
focalPoint,
flyingArcLength;
var width = 960,
height = 600;
var canvas = d3.select('body').append('canvas')
.attr('width', width)
.attr('height', height);
var context = canvas.node().getContext('2d');
context.font = cityLabelFont;
context.textAlign = cityLabelTextAlign;
var projection = d3.geoOrthographic()
.scale((height - 10) / 2)
.translate([width / 2, height / 2])
.precision(0.1);
var loftedProjection = d3.geoOrthographic()
.scale(((height - 10) / 2) * loftedness)
.translate([width / 2, height / 2])
.precision(0.1);
var path = d3.geoPath()
.projection(projection)
.context(context);
var swoosh = d3.line()
.curve(d3.curveNatural)
.defined(function(d) { return projection.invert(d); })
.context(context);
var links = [],
linksMap = d3.map();
var draw = function() {}
d3.queue()
.defer(d3.json, 'https://unpkg.com/world-atlas@1/world/110m.json')
.defer(d3.json, 'capitals.json')
.await(ready);
function ready(error, world, capitals) {
if (error) throw error;
var sphere = {type: "Sphere"},
land = topojson.feature(world, world.objects.land);
// Add unique ID for each capital city
capitals.features.forEach(function(d, i) { d.id = i; });
// Spawn links between capital city locations
capitals.features.forEach(function(a) {
capitals.features.forEach(function(b) {
// Don't want a city to link to itself
if (a !== b) {
var source = a.geometry.coordinates,
target = b.geometry.coordinates;
// Build GeoJSON feature from this link
var feature = {
type: 'Feature',
geometry: {
type: "LineString",
coordinates: [source, target]
},
properties: {
sourceName: a.properties.name,
targetName: b.properties.name,
sourceId: a.id,
targetId: b.id
}
};
// Two restrictions:
// 1) Don't link cities that are too close together
// 2) Don't link cities that are too far apart
// TODO: Figure out clipping and remove restriction (2)
var length = d3.geoLength(feature),
minLength = Math.PI / 6,
maxLength = Math.PI / 2;
if (length > minLength && length < maxLength) {
links.push({
sourceId: a.id,
targetId: b.id,
source: source,
target: target,
feature: feature
});
}
}
});
});
linksMap = d3.nest()
.key(function(d) { return d.sourceId; })
.map(links);
draw = function(t) {
context.clearRect(0, 0, width, height);
// Rotate globe to focus on the flying arc
focusGlobeOnPoint(focalPoint(t));
// Oceans
context.beginPath();
path(sphere);
context.fillStyle = oceanColor;
context.fill();
// Land
context.beginPath();
path(land);
context.fillStyle = landColor;
context.fill();
// Flying arc
context.beginPath();
swoosh(flyingArc(link));
context.setLineDash([t * flyingArcLength * 1.7, 1e6]);
context.lineWidth = flyingArcWidth;
context.strokeStyle = flyingArcColor;
context.stroke();
// Flying arc's shadow
context.beginPath();
path(link.feature);
context.setLineDash([t * flyingArcLength * 1.6, 1e6]);
context.globalAlpha = flyingArcShadowOpacity;
context.shadowColor = flyingArcShadowColor;
context.shadowBlur = flyingArcShadowBlur;
context.lineWidth = flyingArcShadowWidth;
context.strokeStyle = flyingArcShadowStrokeColor;
context.stroke();
context.shadowBlur = 0;
context.globalAlpha = 1;
// Source city marker
var p = projection(link.source),
x = p[0],
y = p[1];
context.beginPath();
context.arc(x, y, cityMarkerRadius, 0, 2 * Math.PI);
context.fillStyle = cityMarkerColor;
context.fill();
// Source city label
var x = x + cityLabelOffset[0],
y = y + cityLabelOffset[1];
context.shadowBlur = cityLabelShadowBlur;
context.shadowColor = cityLabelShadowColor;
context.fillStyle = cityLabelColor;
context.fillText(link.feature.properties.sourceName, x, y);
context.shadowBlur = 0;
// Target city marker
var p = projection(link.target),
x = p[0],
y = p[1];
context.beginPath();
context.arc(x, y, cityMarkerRadius, 0, 2 * Math.PI);
context.fillStyle = cityMarkerColor;
context.fill();
// Target city label
var x = x + cityLabelOffset[0],
y = y + cityLabelOffset[1];
context.shadowBlur = cityLabelShadowBlur;
context.shadowColor = cityLabelShadowColor;
context.fillStyle = cityLabelColor;
context.fillText(link.feature.properties.targetName, x, y);
context.shadowBlur = 0;
};
link = pluckRandom(links);
function shuffle() {
focalPoint = d3.geoInterpolate(link.source, link.target);
flyingArcLength = lineLength(flyingArc(link));
var timer = d3.timer(tick);
function tick(elapsed) {
var t0 = elapsed / transitionDuration,
t = transitionEase(t0);
draw(t);
if (t0 >= 1) {
timer.stop();
// The current target becomes the next source. Pick the next
// target at random.
var targetLinks = linksMap.get(link.targetId);
link = pluckRandom(targetLinks);
shuffle();
};
}
}
shuffle();
}
function flyingArc(link) {
var source = link.source,
target = link.target,
middle = locationAlongArc(source, target, 0.5);
return [
projection(source),
loftedProjection(middle),
projection(target)
];
}
function locationAlongArc(start, end, theta) {
return d3.geoInterpolate(start, end)(theta);
}
function focusGlobeOnPoint(point) {
var x = point[0],
y = point[1],
cx = x,
cy = y - 25,
rotation = [-cx, -cy];
projection.rotate(rotation);
loftedProjection.rotate(rotation);
}
function lineLength(points) {
var d = 0;
for (var i = 0; i < points.length - 1; i++) {
var x0 = points[0][0],
y0 = points[0][1],
x1 = points[1][0],
y1 = points[1][1],
dx = x1 - x0,
dy = y1 - y0;
d += Math.sqrt(dx * dx + dy * dy);
}
return d;
}
function randomInt(n) {
return Math.floor(Math.random() * n);
}
function pluckRandom(array) {
var n = array.length - 1,
i = randomInt(n);
return array[i];
}
</script>
</body>
</html>
Raw
Makefile
all: capitals.json
zip/ne_110m_populated_places_simple.zip:
mkdir -p $(dir $@)
curl -L -o [email protected] 'http://www.naturalearthdata.com/http//www.naturalearthdata.com/download/110m/cultural/ne_110m_populated_places_simple.zip'
mv [email protected] $@
shp/ne_110m_populated_places_simple.shp: zip/ne_110m_populated_places_simple.zip
mkdir -p $(dir $@)
unzip -d $(dir $@) $<
touch $@
capitals.json: shp/ne_110m_populated_places_simple.shp
mapshaper \
-i $< \
-filter 'featurecla === "Admin-0 capital"' \
-each 'countryName = adm0name' \
-filter-fields name,countryName \
-o $@ format=geojson force
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