| license: gpl-3.0 |
Armadillo projection with New Zealand, made to illustrate this question by Thomas Ansart.
It's a composed projection, but simpler, since New Zealand is at the margin and outside the main map. Check the variables ended with NZ to see the strange things.
| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <style> | |
| body { | |
| background: #fcfcfa; | |
| } | |
| .stroke { | |
| fill: none; | |
| stroke: #000; | |
| stroke-width: 3px; | |
| } | |
| .fill { | |
| fill: #e5e6e1; | |
| } | |
| .boundaryNZ { | |
| fill: #e5e6e1; | |
| stroke: #000; | |
| stroke-width: 1px; | |
| } | |
| .graticule { | |
| fill: none; | |
| stroke: #777; | |
| stroke-width: .5px; | |
| stroke-opacity: .5; | |
| } | |
| .land { | |
| fill: #f9fdfc; | |
| stroke: #444; | |
| } | |
| .boundary { | |
| fill: none; | |
| stroke: #444; | |
| stroke-width: .5px; | |
| } | |
| </style> | |
| <body> | |
| <script src="//d3js.org/d3.v5.min.js"></script> | |
| <script src="https://d3js.org/d3-geo-projection.v2.min.js"></script> | |
| <script src="//d3js.org/topojson.v1.min.js"></script> | |
| <script> | |
| var width = 960, | |
| height = 560; | |
| var projection = d3.geoArmadillo() | |
| .scale(237) | |
| .translate([width / 2, height/2]) | |
| .parallel(20) | |
| .rotate([-10, 0]) | |
| .precision(.1); | |
| var path = d3.geoPath() | |
| .projection(projection); | |
| var projectionNZ = d3.geoArmadillo() | |
| .scale(300) | |
| .translate([120 + (width / 2), -140 + height/2]) | |
| .parallel(20) | |
| .rotate([-100, 0]) | |
| .precision(.1); | |
| var pathNZ = d3.geoPath() | |
| .projection(projectionNZ); | |
| var graticule = d3.geoGraticule(); | |
| var graticuleNZ = d3.geoGraticule().extent([[160, -50], [179, -30]]); | |
| var svg = d3.select("body").append("svg") | |
| .attr("width", width) | |
| .attr("height", height); | |
| 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({type: "Polygon", "coordinates": [[[165, -50], [165, -30], [179, -30], [179, -50],[165, -50]]]}) | |
| .attr("class", "boundaryNZ") | |
| .attr("d", pathNZ); | |
| svg.append("path") | |
| .datum(graticule) | |
| .attr("class", "graticule") | |
| .attr("clip-path", "url(#clip)") | |
| .attr("d", path); | |
| svg.append("path") | |
| .datum(graticuleNZ) | |
| .attr("class", "graticule") | |
| .attr("d", pathNZ); | |
| d3.json("world-50m.json").then(function(world){ | |
| var land = topojson.feature(world, world.objects.land); | |
| var stream = d3.geoClipRectangle(166.509144322, -46.641235447, 178.517093541, -34.4506617165); | |
| var landNZ = d3.geoProject(land, {stream}); | |
| svg.insert("path", ".graticule") | |
| .datum(landNZ) | |
| .attr("class", "land") | |
| .attr("d", pathNZ); | |
| svg.insert("path", ".graticule") | |
| .datum(land) | |
| .attr("class", "land") | |
| .attr("clip-path", "url(#clip)") | |
| .attr("d", path); | |
| svg.insert("path", ".graticule") | |
| .datum(topojson.mesh(world, world.objects.countries, function(a, b) { return a !== b; })) | |
| .attr("class", "boundary") | |
| .attr("clip-path", "url(#clip)") | |
| .attr("d", path); | |
| }); | |
| d3.select(self.frameElement).style("height", height + "px"); | |
| </script> |
