D3 Examples - Projection Transitions (Atlantis)

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<!DOCTYPE html>
<meta charset="utf-8">
<style>
​
body {
  height: 500px;
  position: relative;
  width: 960px;
}
​
#projection-menu {
  position: absolute;
  right: 10px;
  top: 10px;
}
​
.background {
  fill: #a4bac7;
}
​
.foreground {
  fill: none;
  stroke: #333;
  stroke-width: 1.5px;
}
​
.graticule {
  fill: none;
  stroke: #fff;
  stroke-width: .5px;
}
​
.graticule:nth-child(2n) {
  stroke-dasharray: 2,2;
}
​
.land {
  fill: #d7c7ad;
  xstroke: #766951;
}
​
.boundary {
  fill: none;
  stroke: #a5967e;
}
​
</style>
<body>
<select id="projection-menu"></select>
<script src="https://d3js.org/d3.v3.min.js"></script>
<script src="https://cdn.jsdelivr.net/gh/d3/d3-plugins/geo/projection/projection.js"></script>
<script>
​
var width = 960,
    height = 500;
​
var options = [
  {name: "Aitoff", projection: d3.geo.aitoff()},
  {name: "Albers", projection: d3.geo.albers().scale(145).parallels([20, 50]).center([0, 0]).translate([width * .500, height * .750])},
  {name: "Bonne", projection: d3.geo.bonne().scale(120).translate([width * .500, height * .425])},
  {name: "Collignon", projection: d3.geo.collignon().scale(93)},
  {name: "Eckert I", projection: d3.geo.eckert1().scale(165)},
  {name: "Eckert II", projection: d3.geo.eckert2().scale(165)},
  {name: "Eckert III", projection: d3.geo.eckert3().scale(180)},
  {name: "Eckert IV", projection: d3.geo.eckert4().scale(180)},
  {name: "Eckert V", projection: d3.geo.eckert5().scale(170)},
  {name: "Eckert VI", projection: d3.geo.eckert6().scale(170)},
  {name: "Equirectangular (Plate Carrée)", projection: d3.geo.equirectangular().scale(950)},
  {name: "Hammer", projection: d3.geo.hammer().scale(165)},
  {name: "Goode Homolosine", projection: d3.geo.homolosine()},
  {name: "Kavrayskiy VII", projection: d3.geo.kavrayskiy7()},
  {name: "Lambert cylindrical equal-area", projection: d3.geo.cylindricalEqualArea()},
  {name: "Larrivée", projection: d3.geo.larrivee().scale(95)},
  {name: "Mercator", projection: d3.geo.mercator().scale(490)},
  {name: "Miller", projection: d3.geo.miller().scale(100)},
  {name: "Mollweide", projection: d3.geo.mollweide().scale(165)},
  {name: "Nell–Hammer", projection: d3.geo.nellHammer()},
  {name: "Polyconic", projection: d3.geo.polyconic().scale(100)},
  {name: "Robinson", projection: d3.geo.robinson()},
  {name: "Sinusoidal", projection: d3.geo.sinusoidal()},
  {name: "van der Grinten", projection: d3.geo.vanDerGrinten().scale(75)},
  {name: "Wagner VI", projection: d3.geo.wagner6()},
  {name: "Winkel Tripel", projection: d3.geo.winkel3()}
];
​
var interval = setInterval(loop, 1500),
    i = 0,
    n = options.length - 1;
​
var projection = options[i].projection
    .translate([width / 2 - .5, height / 2 - .5]);
​
var path = d3.geo.path().projection(projection);
​
var graticule = d3.geo.graticule()
      .extent([[-180, -80], [180, 80]]).step([10, 10]),
    outline = d3.geo.graticule();
​
var svg = d3.select("body").append("svg")
    .attr("width", width)
    .attr("height", height);
​
svg.append("path")
    .datum(outline.outline)
    .attr("class", "background")
    .attr("d", path);
​
svg.selectAll(".graticule")
    .data(graticule.lines)
  .enter().append("path")
    .attr("class", "graticule")
    .attr("d", path);
​
svg.append("path")
    .datum(outline.outline)
    .attr("class", "foreground")
    .attr("d", path);
​
d3.json("readme-boundaries.json", function(err, collection) {
  svg.insert("g", ".graticule")
      .attr("class", "boundary")
    .selectAll("path")
      .data(collection)
    .enter().append("path")
      .attr("d", path);
});
​
d3.json("readme-world-countries.json", function(err, collection) {
  svg.insert("g", ".graticule,.boundary")
      .attr("class", "land")
    .selectAll("path")
      .data(collection)
    .enter().append("path")
      .attr("d", path);
});
​
var menu = d3.select("#projection-menu")
    .on("change", change);
​
menu.selectAll("option")
    .data(options)
  .enter().append("option")
    .text(function(d) { return d.name; });
​
function loop() {
  var j = Math.floor(Math.random() * n);
  menu.property("selectedIndex", i = j + (j >= i));
  update(options[i]);
}
​
function change() {
  clearInterval(interval);
  update(options[this.selectedIndex]);
}
​
function update(option) {
  path.projection(projection = option.projection);
  projection.rotate([30, -45, 90]);
  svg.selectAll(".land path, .boundary path, .graticule path").transition()
      .duration(750)
      .attr("d", path);
  d3.timer.flush();
  projection.rotate([0, 0, 0]);
  svg.selectAll(".background, .foreground").transition()
      .duration(750)
      .attr("d", path);
  d3.timer.flush();
}
​
</script>
​
    