A rotating transverse Mercator projection.
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Rotating Transverse Mercator
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| license: gpl-3.0 | |
| height: 960 |
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <canvas width="960" height="960"></canvas> | |
| <script src="https://d3js.org/d3.v4.min.js"></script> | |
| <script src="https://unpkg.com/topojson-client@2"></script> | |
| <script> | |
| var width = 960, | |
| height = 960, | |
| speed = 1e-2; | |
| var projection = d3.geoTransverseMercator() | |
| .scale((width + 1) / 2 / Math.PI) | |
| .translate([width / 2, height / 2]) | |
| .precision(0.5); | |
| var canvas = d3.select("canvas"), | |
| context = canvas.node().getContext("2d"), | |
| path = d3.geoPath(projection, context); | |
| d3.json("https://unpkg.com/world-atlas@1/world/110m.json", function(error, topo) { | |
| if (error) throw error; | |
| var graticule = d3.geoGraticule10(), | |
| land = topojson.feature(topo, topo.objects.land), | |
| borders = topojson.mesh(topo, topo.objects.countries, function(a, b) { return a !== b; }); | |
| d3.timer(function(elapsed) { | |
| projection.rotate([speed * elapsed, 0]); | |
| context.clearRect(0, 0, width, height); | |
| context.beginPath(); | |
| path(land); | |
| context.fillStyle = "#222"; | |
| context.fill(); | |
| context.beginPath(); | |
| path(borders); | |
| context.lineWidth = 0.5; | |
| context.strokeStyle = "#fff"; | |
| context.stroke(); | |
| context.beginPath(); | |
| path(graticule); | |
| context.lineWidth = 0.5; | |
| context.strokeStyle = "rgba(119,119,119,.5)"; | |
| context.stroke(); | |
| }); | |
| }); | |
| </script> |
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