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mercator.html
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<!DOCTYPE html>
<meta charset="utf-8">
<link href="https://fonts.googleapis.com/css?family=Neucha" rel="stylesheet">
<style>
body {
background: #efe;
margin: 0;
padding: 0;
/*height: 500px;*/
/*position: relative;*/
/*width: 960px;*/
}
#projection-menu {
position: absolute;
right: 10px;
top: 10px;
/*display: none;*/
}
.stroke {
fill: none;
stroke: #000;
/*stroke: transparent;*/
stroke-width: 1px;
}
.fill {
/*fill: #1795d1;*/
/*fill: none;*/
}
#sphere {
/*fill: #1795d1;*/
fill: white;
/*fill: transparent;*/
}
.graticule {
fill: none;
stroke: #ddd;
stroke-width: 1px;
stroke-opacity: 1;
}
.land {
fill: #fff;
}
.ocean {
fill: #1795d1;
/*fill: white;*/
}
.boundary {
fill: none;
stroke: #fff;
stroke-width: .5px;
}
.route {
fill: none;
stroke: #555;
stroke-width: 2px;
}
.point {
fill: #555;
stroke: #555;
stroke-width: 4px;
}
.label {
text-align: center;
text-anchor: middle;
font-size: 3em;
font-family: Neucha;
}
</style>
<select id="projection-menu"></select>
<script src="//d3js.org/d3.v5.min.js"></script>
<script src="//d3js.org/d3-geo-projection.v2.min.js"></script>
<script src="//d3js.org/topojson.v2.min.js"></script>
<script>
function addRoute(r) {
svg.insert("path", ".route")
.datum(getLineString(r))
.attr("class", "route")
.attr("d", path);
svg.insert("path", ".point")
.datum(getMultiPoint(r))
.attr("class", "point")
.attr("d", path);
}
function getLineString(i) {
return {
"type": "FeatureCollection",
"features": [
{
"type": "Feature",
"geometry": {
"type": "LineString",
"coordinates": i
}
}
]
};
}
function getMultiPoint(i) {
return {
"type": "FeatureCollection",
"features": [
{
"type": "Feature",
"geometry": {
"type": "MultiPoint",
"coordinates": i
}
}
]
};
}
var
width = 960,
height = 500,
// width = 1080,
// height = 692,
// anim = 250*3,
// wait = 2000 //666*3
// anim = 200,
// wait = 666
anim = 200 * 3,
wait = 2000
;
var projection1 = d3.geoMercator()
.scale(490 / 2 / Math.PI)
.rotate([0, 0])
.center([0, 0])
// .clipExtent([[480 - 150 * Math.PI, 100], [480 + 150 * Math.PI, 860]]);
;
var projection2 = d3.geoOrthographic()
// .clipAngle(90)
// .rotate([0, 0])
// .center([0, 0])
;
var graticule = d3.geoGraticule()
.stepMinor([30,30])
.extentMinor([[-180,-90], [180,90]])
;
var path = d3.geoPath().projection(projection1);
var svg = d3.select("body").append("svg")
.attr("width", width)
.attr("height", height);
// var background = svg.append("rect")
// .attr("width", width)
// .attr("height", height)
// .attr("fill", "#eee");
var defs = svg.append("defs")
defs.append("path")
.datum({type: "Sphere"})
.attr("id", "sphere")
.attr("d", path);
defs.append("clipPath")
.attr("id", "clip")
.append("use")
.attr("xlink:href", "#sphere");
svg.append("use")
.attr("class", "stroke")
.attr("xlink:href", "#sphere");
svg.append("use")
.attr("class", "fill")
.attr("xlink:href", "#sphere");
svg.append("path")
.datum(graticule)
.attr("class", "graticule")
// .attr("clip-path", "url(#clip)")
.attr("d", path);
d3.json("common/geojson/ne_110m_wgs84_bounding_box.geojson").then(function(world) {
// svg.insert("path", ".graticule")
// .datum(world)
// .attr("class", "bbox")
// // .attr("clip-path", "url(#clip)")
// .attr("d", path);
d3.json("common/geojson/ne_110m_ocean.geojson").then(function(world) {
svg.insert("path", ".graticule")
.datum(world)
.attr("class", "ocean")
// .attr("clip-path", "url(#clip)")
.attr("d", path);
d3.json("common/geojson/ne_110m_land.geojson").then(function(world) {
svg.insert("path", ".graticule")
.datum(world)
.attr("class", "land")
// .attr("clip-path", "url(#clip)")
.attr("d", path);
update()
});
});
});
function update() {
svg.selectAll("path").transition()
.duration(3000)
.attrTween("d", projectionTween(projection1, projection2));
}
function projectionTween(projection0, projection1) {
return function(d) {
var t = 0;
var projection = d3.geoProjection(project)
.scale(1)
.translate([width / 2, height / 2]);
var path = d3.geoPath(projection);
function project(λ, φ) {
λ *= 180 / Math.PI, φ *= 180 / Math.PI
var distance = d3.geoDistance([0,0],[λ, φ]);
distance *= 180 / Math.PI;
// console.log([λ, φ]);
var p0 = projection0([λ, φ])
var p1 = [0,0];
// console.log(distance);
if (distance < 90) {
p1 = projection1([λ, φ]);
}
if (isNaN(p0[0])) p0[0] = 0;
if (isNaN(p1[0])) p1[0] = 0;
if (isNaN(p0[1])) p0[1] = 0;
if (isNaN(p1[1])) p1[1] = 0;
if (p0[0] === Number.NEGATIVE_INFINITY) p0[0] = -9999;
if (p1[0] === Number.NEGATIVE_INFINITY) p1[0] = -9999;
if (p0[1] === Number.NEGATIVE_INFINITY) p0[1] = -9999;
if (p1[1] === Number.NEGATIVE_INFINITY) p1[1] = -9999;
if (p0[0] === Number.POSITIVE_INFINITY) p0[0] = 9999;
if (p1[0] === Number.POSITIVE_INFINITY) p1[0] = 9999;
if (p0[1] === Number.POSITIVE_INFINITY) p0[1] = 9999;
if (p1[1] === Number.POSITIVE_INFINITY) p1[1] = 9999;
return [(1 - t) * p0[0] + t * p1[0], (1 - t) * -p0[1] + t * -p1[1]];
}
return function(_) {
t = _;
return path(d);
};
};
}
</script>