Waterman Projection with an Automatically Colored World Map
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Colored Waterman
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <style> | |
| .background { | |
| fill: #b4cad7; | |
| } | |
| .country { | |
| fill: #ccc; | |
| stroke: #fff; | |
| stroke-width: .5px; | |
| stroke-linejoin: round; | |
| } | |
| .graticule { | |
| fill: none; | |
| stroke: #000; | |
| stroke-opacity: .5; | |
| stroke-width: .5px; | |
| } | |
| </style> | |
| <body> | |
| <script src="http://d3js.org/d3.v3.min.js"></script> | |
| <script src="http://d3js.org/d3.geo.polyhedron.v0.min.js"></script> | |
| <script src="http://d3js.org/topojson.v0.min.js"></script> | |
| <script> | |
| var width = 960, | |
| height = 500; | |
| var projection = d3.geo.polyhedron.waterman() | |
| .scale(108) | |
| .translate([width / 2, height / 2]) | |
| .rotate([20, 0]); | |
| var path = d3.geo.path() | |
| .projection(projection); | |
| var graticule = d3.geo.graticule() | |
| .step([10, 10]) | |
| .extent([[-180, -80], [180, 80 + 1e-3]]); | |
| var svg = d3.select("body").append("svg") | |
| .attr("width", width) | |
| .attr("height", height); | |
| svg.append("defs").append("path") | |
| .datum({type: "Sphere"}) | |
| .attr("id", "sphere") | |
| .attr("d", path); | |
| svg.append("clipPath") | |
| .attr("id", "clip") | |
| .append("use") | |
| .attr("xlink:href", "#sphere"); | |
| svg.append("use") | |
| .attr("class", "background") | |
| .attr("xlink:href", "#sphere"); | |
| svg.append("g") | |
| .attr("class", "graticule") | |
| .attr("clip-path", "url(#clip)") | |
| .selectAll("path") | |
| .data(graticule.lines) | |
| .enter().append("path") | |
| .attr("d", path); | |
| d3.json("/d/4090846/world-110m.json", function(error, world) { | |
| var neighbors = topojson.neighbors(world, world.objects.countries.geometries), | |
| colors = d3.scale.category10().range().map(function(c) { c = d3.hcl(c); c.h = 0.95*c.h + 100; return c; }), | |
| nColors = colors.length, | |
| colorByObject = {}; | |
| world.objects.countries.geometries.forEach(function(o, index) { | |
| var oNeighbours = neighbors[index] || [], | |
| m = oNeighbours.length; | |
| nextColor: | |
| for (var i = 0; i < nColors; ++i) { | |
| var color = colors[i]; | |
| for (var j = 0; j < m; ++j) { | |
| if (colorByObject[oNeighbours[j].id] === color) continue nextColor; | |
| } | |
| colorByObject[o.id] = color; | |
| break; | |
| } | |
| }); | |
| svg.selectAll(".country") | |
| .data(topojson.object(world, world.objects.countries).geometries) | |
| .enter().insert("path", ".graticule") | |
| .attr("class", "country") | |
| .attr("clip-path", "url(#clip)") | |
| .attr("d", path) | |
| .style("fill", function(d) { return colorByObject[d.id]; }); | |
| }); | |
| topojson.neighbors = function(topology, objects) { | |
| var objectsByArc = topology.arcs.map(function() { return []; }); | |
| function line(arcs, index) { | |
| for (var i = 0, n = arcs.length, arc; i < n; ++i) { | |
| if ((arc = arcs[i]) < 0) arc = ~arc; | |
| objectsByArc[arc].push(index); | |
| } | |
| } | |
| function polygon(arcs, i) { | |
| arcs.forEach(function(arc) { line(arc, i); }); | |
| } | |
| function geometry(o, i) { | |
| geometryType[o.type](o.arcs, i); | |
| } | |
| var geometryType = { | |
| LineString: line, | |
| MultiLineString: polygon, | |
| Polygon: polygon, | |
| MultiPolygon: function(arcs, i) { arcs.forEach(function(arc) { polygon(arc, i); }); } | |
| }; | |
| objects.forEach(geometry); | |
| var neighbors = []; | |
| objectsByArc.forEach(function(d) { | |
| if (d.length < 2) return; | |
| if (!neighbors[d[0]]) neighbors[d[0]] = []; | |
| if (!neighbors[d[1]]) neighbors[d[1]] = []; | |
| neighbors[d[0]].push(objects[d[1]]); | |
| neighbors[d[1]].push(objects[d[0]]); | |
| }); | |
| return neighbors; | |
| }; | |
| </script> |
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