The Mercator projection is available as d3.geoMercator in d3-geo.
forked from mbostock's block: Spherical Mercator
Created
March 25, 2017 15:43
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Spherical Mercator
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| license: gpl-3.0 | |
| height: 960 | |
| border: no |
This file contains 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> | |
| <meta charset="utf-8"> | |
| <style> | |
| .stroke { | |
| fill: none; | |
| stroke: #000; | |
| stroke-width: 3px; | |
| } | |
| .fill { | |
| fill: #fff; | |
| } | |
| .graticule { | |
| fill: none; | |
| stroke: #777; | |
| stroke-width: 0.5px; | |
| stroke-opacity: 0.5; | |
| } | |
| .land { | |
| fill: #222; | |
| } | |
| .boundary { | |
| fill: none; | |
| stroke: #fff; | |
| stroke-width: 0.5px; | |
| } | |
| .circle { | |
| stroke: red; | |
| fill: red; | |
| fill-opacity: 0.2; | |
| } | |
| </style> | |
| <svg width="960" height="960"></svg> | |
| <script src="https://d3js.org/d3.v4.min.js"></script> | |
| <script src="https://unpkg.com/topojson-client@2"></script> | |
| <script> | |
| var svg = d3.select("svg"), | |
| width = +svg.attr("width"), | |
| height = +svg.attr("height"); | |
| var projection = d3.geoMercator() | |
| .scale((width - 3) / (2 * Math.PI)) | |
| .translate([width / 2, height / 2]); | |
| var path = d3.geoPath() | |
| .projection(projection); | |
| var graticule = d3.geoGraticule(); | |
| var EARTH_RADIUS = 3959; // mean radius in miles | |
| var radiusMi = 50; // radius to be drawn in miles | |
| var radiusDeg = radiusMi / EARTH_RADIUS * 90; // radius in degrees for circle generator | |
| var circle = d3.geoCircle().radius(radiusDeg).center(d => d); | |
| var centerPoints = d3.merge(d3.range(-180, 180, 10).map(lon => | |
| d3.range(-80, 90, 10).map(lat => [lon, lat]))); | |
| console.log(centerPoints); | |
| svg.append("defs").append("path") | |
| .datum({type: "Sphere"}) | |
| .attr("id", "sphere") | |
| .attr("d", path); | |
| svg.append("use") | |
| .attr("class", "stroke") | |
| .attr("xlink:href", "#sphere"); | |
| svg.append("use") | |
| .attr("class", "fill") | |
| .attr("xlink:href", "#sphere"); | |
| svg.append("path") | |
| .datum(graticule) | |
| .attr("class", "graticule") | |
| .attr("d", path); | |
| svg.selectAll(".circle") | |
| .data(centerPoints) | |
| .enter().append("path") | |
| .datum(circle) | |
| .attr("class", "circle") | |
| .attr("d", path); | |
| d3.json("https://unpkg.com/world-atlas@1/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); | |
| svg.insert("path", ".graticule") | |
| .datum(topojson.mesh(world, world.objects.countries, function(a, b) { return a !== b; })) | |
| .attr("class", "boundary") | |
| .attr("d", path); | |
| }); | |
| </script> |
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