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forked from Fil's block: Poor man's Composite projection
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September 2, 2017 13:41
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Poor man's Composite projection
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| license: mit |
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
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| <!DOCTYPE html> | |
| <head> | |
| <meta charset="utf-8"> | |
| <script src="https://d3js.org/d3.v4.js"></script> | |
| <script src="https://d3js.org/d3-geo-projection.v2.js"></script> | |
| <script src="https://d3js.org/topojson.v2.min.js"></script> | |
| <style> | |
| body { margin:0;position:fixed;top:0;right:0;bottom:0;left:0; } | |
| path { fill: none; stroke: black; } | |
| #land { fill: black } | |
| #sphere { stroke-width: 2; fill: lightblue; } | |
| #invert { fill: red} | |
| </style> | |
| </head> | |
| <body> | |
| <script> | |
| // Feel free to change or delete any of the code you see in this editor! | |
| var svg = d3.select("body").append("svg") | |
| .attr("width", 960) | |
| .attr("height", 500) | |
| var projections = [ | |
| d3.geoLagrange() | |
| .clipExtent([[0,0],[480,250]]), | |
| d3.geoAzimuthalEqualArea() | |
| .clipExtent([[480,0],[960,250]]), | |
| d3.geoOrthographic() | |
| .clipExtent([[0,250],[480,500]]), | |
| d3.geoAzimuthalEquidistant() | |
| .clipExtent([[480,250],[960,500]]) | |
| ]; | |
| //o = d3.geoCircle().center([0,0]).radius(10)(); | |
| var paths = projections.map(p => d3.geoPath(p)); | |
| var projection = {}; | |
| projection.invert = function(p) { | |
| for( var i = 0; i < projections.length; i++) { | |
| var k = projections[i].invert(p); | |
| if (k && paths[i]({type:"Point", coordinates: k})) | |
| return k; | |
| } | |
| } | |
| svg.on('mousemove', function(){ | |
| var m = d3.mouse(this); | |
| point.datum({ | |
| type:"Point", | |
| coordinates: projection.invert(m) | |
| }) | |
| }) | |
| var path = function(d) { | |
| return paths.map(p => p(d)) | |
| .filter(d => !!d) | |
| .join("") || null; | |
| } | |
| svg.append("path") | |
| .attr("id", "sphere") | |
| .datum({type: "Sphere"}) | |
| .attr('d', d3.geoPath(d3.geoOrthographic())) | |
| svg.append("path") | |
| .datum(d3.geoGraticule()()) | |
| .classed('composite', true) | |
| var land = svg.append("path") | |
| .attr('id', 'land') | |
| .classed('composite', true); | |
| var point = svg.append("path") | |
| .attr('id', "invert") | |
| .classed('composite', true) | |
| .datum({ type:"Point", coordinates: [1,2] }) | |
| d3.json("https://unpkg.com/world-atlas@1/world/110m.json", function( | |
| error, | |
| world | |
| ) { | |
| land.datum(topojson.merge(world, world.objects.countries.geometries)); | |
| } | |
| ); | |
| if (1) | |
| d3.timer(_ => { | |
| projections[0].rotate([_/100, 0]) | |
| projections[1].rotate([30, _/100, -_/100]) | |
| projections[2].rotate([_/100, 0, -_/100]) | |
| projections[3].rotate([_/100, _/100, _/100]) | |
| svg.selectAll('path.composite') | |
| .attr("d", path); | |
| }) | |
| </script> | |
| </body> |
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