Skip to content

Instantly share code, notes, and snippets.

@awoodruff
Last active June 1, 2018 20:05
  • Star 2 You must be signed in to star a gist
  • Fork 1 You must be signed in to fork a gist
Star You must be signed in to star a gist
Save awoodruff/9216081 to your computer and use it in GitHub Desktop.
Projection face!
Display the source blob
Display the rendered blob
Raw
Sorry, something went wrong. Reload?
Sorry, we cannot display this file.
Sorry, this file is invalid so it cannot be displayed.
<!DOCTYPE html>
<meta charset="utf-8">
<title>PROJECTION FACE</title>
<style>
body{ text-align: center }
</style>
<div id="map"></div>
<select id="projection-menu"></select>
<script src="http://d3js.org/d3.v3.min.js"></script>
<script src="http://d3js.org/d3.geo.projection.v0.min.js"></script>
<script src="http://d3js.org/d3.geo.polyhedron.v0.min.js"></script>
<script>
var ratio = window.devicePixelRatio || 1,
width = 960 * ratio,
height = 450 * ratio;
var options = [
{name: "Aitoff", projection: d3.geo.aitoff()},
{name: "Albers", projection: d3.geo.albers().scale(145).parallels([20, 50])},
{name: "August", projection: d3.geo.august().scale(60)},
{name: "Baker", projection: d3.geo.baker().scale(100)},
{name: "Berghaus", projection: d3.geo.berghaus().scale(100)},
{name: "Boggs", projection: d3.geo.boggs()},
{name: "Bonne", projection: d3.geo.bonne().scale(100)},
{name: "Bromley", projection: d3.geo.bromley()},
{name: "Collignon", projection: d3.geo.collignon().scale(93)},
{name: "Craster Parabolic", projection: d3.geo.craster()},
{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: "Eisenlohr", projection: d3.geo.eisenlohr().scale(60)},
{name: "Equirectangular (Plate Carrée)", projection: d3.geo.equirectangular()},
{name: "Fahey", projection: d3.geo.fahey().scale(120)},
{name: "Gall Stereographic", projection: d3.geo.cylindricalStereographic().parallel(45).scale(140)},
{name: "Goode Homolosine", projection: d3.geo.homolosine()},
{name: "Ginzburg IV", projection: d3.geo.ginzburg4().scale(120)},
{name: "Ginzburg V", projection: d3.geo.ginzburg5().scale(120)},
{name: "Ginzburg VI", projection: d3.geo.ginzburg6().scale(120)},
{name: "Ginzburg VIII", projection: d3.geo.ginzburg8().scale(120)},
{name: "Ginzburg IX", projection: d3.geo.ginzburg9().scale(120)},
{name: "Gringorten", projection: d3.geo.gringorten().scale(220)},
{name: "Guyou", projection: d3.geo.guyou().scale(150)},
{name: "Hammer", projection: d3.geo.hammer().scale(165)},
{name: "Hammer Retroazimuthal", projection: d3.geo.hammerRetroazimuthal().scale(90)},
{name: "HEALPix", projection: d3.geo.healpix()},
{name: "Hill", projection: d3.geo.hill().scale(120)},
{name: "Kavrayskiy VII", projection: d3.geo.kavrayskiy7()},
{name: "Lagrange", projection: d3.geo.lagrange().scale(120)},
{name: "Lambert cylindrical equal-area", projection: d3.geo.cylindricalEqualArea()},
{name: "Larrivée", projection: d3.geo.larrivee().scale(95)},
{name: "Laskowski", projection: d3.geo.laskowski().scale(120)},
{name: "Loximuthal", projection: d3.geo.loximuthal()},
{name: "Mercator", projection: d3.geo.mercator().scale(100)},
{name: "Miller", projection: d3.geo.miller().scale(100)},
{name: "McBryde–Thomas Flat-Polar Parabolic", projection: d3.geo.mtFlatPolarParabolic()},
{name: "McBryde–Thomas Flat-Polar Quartic", projection: d3.geo.mtFlatPolarQuartic()},
{name: "McBryde–Thomas Flat-Polar Sinusoidal", projection: d3.geo.mtFlatPolarSinusoidal()},
{name: "Mollweide", projection: d3.geo.mollweide().scale(165)},
{name: "Natural Earth", projection: d3.geo.naturalEarth()},
{name: "Nell–Hammer", projection: d3.geo.nellHammer()},
{name: "Orthographic", projection: d3.geo.orthographic().scale(200)},
{name: "Polyconic", projection: d3.geo.polyconic().scale(100)},
{name: "Rectangular Polyconic", projection: d3.geo.rectangularPolyconic().scale(120)},
{name: "Robinson", projection: d3.geo.robinson()},
{name: "Sinusoidal", projection: d3.geo.sinusoidal()},
{name: "Sinu-Mollweide", projection: d3.geo.sinuMollweide()},
{name: "Stereographic", projection: d3.geo.stereographic()},
{name: "Times", projection: d3.geo.times().scale(140)},
{name: "Van der Grinten", projection: d3.geo.vanDerGrinten().scale(75)},
{name: "Van der Grinten II", projection: d3.geo.vanDerGrinten2().scale(75)},
{name: "Van der Grinten III", projection: d3.geo.vanDerGrinten3().scale(75)},
{name: "Van der Grinten IV", projection: d3.geo.vanDerGrinten4().scale(120)},
{name: "Wagner IV", projection: d3.geo.wagner4()},
{name: "Wagner VI", projection: d3.geo.wagner6()},
{name: "Wagner VII", projection: d3.geo.wagner7()},
{name: "Waterman", projection: d3.geo.polyhedron.waterman().scale(70)},
{name: "Winkel Tripel", projection: d3.geo.winkel3()}
];
var menu = d3.select("#projection-menu")
.on("change", change);
menu.selectAll("option")
.data(options)
.enter().append("option")
.text(function(d) { return d.name; });
function change() {
update(options[this.selectedIndex]);
}
var i = 0,
n = options.length - 1;
rando();
var projection = options[i].projection;
options.forEach(function(option) {
option.projection
.translate([width / 2, height / 2])
.scale(option.projection.scale() * ratio)
.clipExtent([[2 * ratio, 2 * ratio], [width - 2 * ratio, height - 2 * ratio]]);
});
var graticule = d3.geo.graticule()(),
face,
boundaries;
var canvas = d3.select("#map").append("canvas")
.attr("width", width)
.attr("height", height)
.style("width", width / ratio + "px")
.style("height", height / ratio + "px");
var context = canvas.node().getContext("2d");
context.fillStyle = "#f9f9f9";
context.strokeStyle = "#000";
var path = d3.geo.path()
.projection(projection)
.context(context);
function rando() {
var j = Math.floor(Math.random() * n);
i = j + (j >= i);
menu.property("selectedIndex", i = j + (j >= i));
}
function change() {
update(options[this.selectedIndex]);
}
function pathTween(projection0, projection1) {
var t = 0,
projection = d3.geo.projection(function(λ, φ) {
λ *= 180 / Math.PI, φ *= 180 / Math.PI;
var p0 = projection0([λ, φ]), p1 = projection1([λ, φ]);
return [(1 - t) * p0[0] + t * p1[0], (1 - t) * -p0[1] + t * -p1[1]];
})
.scale(1)
.translate([width / 2, height / 2])
.clipExtent(projection0.clipExtent()),
path = d3.geo.path().projection(projection).context(context);
return function() {
return function(u) {
t = u;
redraw(path);
};
};
}
function update(option) {
canvas.transition()
.duration(750)
.ease( d3.ease("quad") )
.tween("path", pathTween(projection, projection = option.projection));
path.projection(projection);
}
function redraw(path) {
context.clearRect(0, 0, width, height);
context.lineWidth = .5 * ratio;
context.strokeStyle = "#999";
context.beginPath(), path(graticule), context.stroke();
context.beginPath(), path({type: "Sphere"}), context.stroke();
context.lineWidth = 2 * ratio;
if (face) {
context.strokeStyle = "#000";
context.lineWidth = 2;
context.beginPath(), path(face), context.stroke();
}
}
d3.json("/awoodruff/raw/9216081/face.geojson", function(error, data) {
face = data;
redraw(path)
});
</script>
</body>
</html>
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment