This is still a work in progress; elliptical clipping is needed to avoid visible artifacts outside of 145° in this example.
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February 9, 2016 02:09
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Two Point Equidistant
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| license: gpl-3.0 |
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <style> | |
| .background { | |
| fill: #ff0; | |
| fill-opacity: .1; | |
| } | |
| .foreground { | |
| fill: none; | |
| stroke: #333; | |
| stroke-width: 1.5px; | |
| } | |
| .graticule { | |
| fill: none; | |
| stroke: #f00; | |
| stroke-width: .5px; | |
| } | |
| .land { | |
| fill: cyan; | |
| fill-opacity: .5; | |
| } | |
| </style> | |
| <body> | |
| <script src="//d3js.org/d3.v3.min.js"></script> | |
| <script src="//d3js.org/d3.geo.projection.v0.min.js"></script> | |
| <script src="//d3js.org/topojson.v1.min.js"></script> | |
| <script> | |
| var width = 960, | |
| height = 652; | |
| var a = [-158, 21.5], // Honolulu, HI | |
| b = [-77, 39]; // Washington, DC | |
| var projection = d3.geo.twoPointEquidistant() | |
| .points([a, b]) | |
| .scale(132.5) | |
| .translate([width / 2, height / 2]) | |
| .clipAngle(145) // TODO clip to ellipse | |
| .precision(.1); | |
| var path = d3.geo.path() | |
| .projection(projection); | |
| var graticule = d3.geo.graticule() | |
| .minorStep([15, 15]) | |
| .minorExtent([[-180, -75], [180, 75 + 1e-4]]); | |
| var svg = d3.select("body").append("svg") | |
| .attr("width", width) | |
| .attr("height", height); | |
| svg.append("image") | |
| .attr("xlink:href", "two-point-equidistant.png") | |
| .attr("transform", "rotate(1.2 " + width / 2 + "," + height / 2 + ")") | |
| .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("path") | |
| .datum(graticule) | |
| .attr("class", "graticule") | |
| .attr("d", path); | |
| d3.json("/mbostock/raw/4090846/world-50m.json", function(error, world) { | |
| if (error) throw error; | |
| svg.insert("path", ".graticule") | |
| .datum(topojson.feature(world, world.objects.land)) | |
| .attr("class", "land") | |
| .attr("d", path); | |
| }); | |
| d3.select(self.frameElement).style("height", height + "px"); | |
| </script> |
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