A demonstration of antimeridian cutting using d3.geoInterruptedHomolosine. Just… because.
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August 31, 2017 01:07
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Antimeridian Cutting II
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| license: gpl-3.0 |
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <canvas width="960" height="500"></canvas> | |
| <script src="https://d3js.org/d3.v4.min.js"></script> | |
| <script src="https://d3js.org/d3-geo-projection.v1.min.js"></script> | |
| <script src="https://d3js.org/topojson.v2.min.js"></script> | |
| <script> | |
| var canvas = d3.select("canvas"), | |
| context = canvas.node().getContext("2d"), | |
| width = canvas.property("width"), | |
| height = canvas.property("height"); | |
| var lambda = d3.scaleLinear() | |
| .domain([0, width]) | |
| .range([-180, 180]); | |
| var phi = d3.scaleLinear() | |
| .domain([0, height]) | |
| .range([90, -90]); | |
| var projection = d3.geoInterruptedHomolosine() | |
| .translate([width / 2, height / 2]); | |
| var path = d3.geoPath() | |
| .projection(projection) | |
| .context(context); | |
| d3.json("https://d3js.org/world-110m.v1.json", function(error, world) { | |
| if (error) throw error; | |
| var land = topojson.feature(world, world.objects.land), | |
| sphere = {type: "Sphere"}, | |
| touch = "ontouchstart" in window; | |
| canvas.on(touch ? "touchmove" : "mousemove", move); | |
| draw(); | |
| function move() { | |
| var p = touch ? d3.touches(this)[0] : d3.mouse(this); | |
| projection.rotate([lambda(p[0]), phi(p[1])]), draw(); | |
| d3.event.preventDefault(); | |
| } | |
| function draw() { | |
| context.clearRect(0, 0, width, height); | |
| context.save(); | |
| context.beginPath(); | |
| path(sphere); | |
| context.fillStyle = "#fff"; | |
| context.fill(); | |
| context.clip(); | |
| context.beginPath(); | |
| path(land); | |
| context.fillStyle = "#000"; | |
| context.fill(); | |
| context.restore(); | |
| context.beginPath(); | |
| path(sphere); | |
| context.stroke(); | |
| } | |
| }); | |
| </script> |
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