Aitoff projection with a brush that logs the bounding corners in latlong for the brush area.
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Projected Geodata with a Bounding Box Brush
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <style> | |
| .background { | |
| fill: #a4bac7; | |
| } | |
| .foreground { | |
| fill: none; | |
| stroke: #333; | |
| stroke-width: 1.5px; | |
| } | |
| .graticule { | |
| fill: none; | |
| stroke: #fff; | |
| stroke-width: .5px; | |
| } | |
| .graticule :nth-child(2n) { | |
| stroke-dasharray: 2,2; | |
| } | |
| .land { | |
| fill: #d7c7ad; | |
| stroke: #766951; | |
| } | |
| .boundary { | |
| fill: none; | |
| stroke: #a5967e; | |
| } | |
| .brush .extent { | |
| stroke: #fff; | |
| fill-opacity: .125; | |
| shape-rendering: crispEdges; | |
| } | |
| </style> | |
| <body> | |
| <script src="http://d3js.org/d3.v3.min.js"></script> | |
| <script src="http://d3js.org/d3.geo.projection.v0.min.js"></script> | |
| <script src="http://d3js.org/topojson.v0.min.js"></script> | |
| <script> | |
| var width = 960, | |
| height = 500; | |
| var projection = d3.geo.aitoff(); | |
| var path = d3.geo.path() | |
| .projection(projection); | |
| var graticule = d3.geo.graticule(); | |
| var x = d3.scale.linear() | |
| .range([0, width]); | |
| var y = d3.scale.linear() | |
| .range([height, 0]); | |
| brush = d3.svg.brush() | |
| .x(x) | |
| .y(y) | |
| .on("brush", brushed) | |
| .on("brushend", bounding) | |
| .extent([[100, 100], [200, 200]]); | |
| 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("use") | |
| .attr("class", "background") | |
| .attr("xlink:href", "#sphere"); | |
| svg.append("g") | |
| .attr("class", "graticule") | |
| .selectAll("path") | |
| .data(graticule.lines) | |
| .enter().append("path") | |
| .attr("d", path); | |
| svg.append("use") | |
| .attr("class", "foreground") | |
| .attr("xlink:href", "#sphere"); | |
| svg.append("g") | |
| .attr("class", "brush") | |
| .call(brush); | |
| d3.json("/d/4090846/world-110m.json", function(error, world) { | |
| svg.insert("path", ".graticule") | |
| .datum(topojson.object(world, world.objects.land)) | |
| .attr("class", "land") | |
| .attr("d", path); | |
| svg.insert("path", ".graticule") | |
| .datum(topojson.mesh(world, world.objects.countries, function(a, b) { return a !== b; })) | |
| .attr("class", "boundary") | |
| .attr("d", path); | |
| }); | |
| brushed(); | |
| function brushed() { | |
| } | |
| function bounding() { | |
| var extent = brush.extent(); | |
| console.log("top left: " + projection.invert([x(extent[0][0]),y(extent[1][1])])) | |
| console.log("bottom right: " + projection.invert([x(extent[1][0]),y(extent[0][1])])) | |
| } | |
| </script> |
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