D3 will "break and make art" if you adjust the clipAngle
of an orthographic projection created with d3.geoOrthographic()
.
To create the transparent globe effect, set the clipAngle
to 180.
This map uses an with D3.js and Topojson to draw a map of the world's countries onto a spinning globe, rendered here with a graticule that is 10° by 10°.
The world countries polygons were downloaded from ArcGIS.
See also:
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<html>
<head>
<style>
body {
font-family: "Helvetica Neue", sans-serif;
margin: 0;
background: #3a403d;
}
</style>
</head>
<body>
<script src="https://d3js.org/d3.v4.min.js"></script>
<script src="https://d3js.org/topojson.v1.min.js"></script>
<script>
var width = window.innerWidth, height = window.innerHeight;
var projection = d3.geoOrthographic()
.scale(width / 4.1)
.translate([width / 2, height / 2])
.clipAngle(180)
.precision(1);
var path = d3.geoPath()
.projection(projection);
var svg = d3.select("body").append("svg")
.attr("width", width)
.attr("height", height);
var g = svg.append("g");
var graticule = d3.geoGraticule()
.step([10, 10]);
g.append("path")
.datum(graticule)
.attr("class", "graticule")
.attr("d", path)
.style("fill", "#fff")
.style("stroke", "#ccc");
d3.timer(function(elapsed) {
projection.rotate([.05 * elapsed - 120, 0, 0]);
g.selectAll("path").attr("d", path);
});
var c = d3.scaleOrdinal(d3.schemeCategory20);
d3.json("countries.json", function(error, data){
g.selectAll(".subunit")
.data(topojson.feature(data, data.objects.polygons).features)
.enter().append("path")
.attr("class", "subunit")
.attr("d", path)
.style("stroke", "#fff")
.style("stroke-width", "1px")
.style("fill", function(d,i){ return c(i); })
.style("opacity", ".6");
});
</script>
</body>
</html>
https://d3js.org/d3.v4.min.js
https://d3js.org/topojson.v1.min.js