Another way of implementing a see-through globe, this time always clipping to 90°, but flipping the canvas along the x-axis to draw the back-facing polygons.
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February 1, 2020 08:48
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See-Through Globe II
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license: gpl-3.0 |
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<!DOCTYPE html> | |
<meta charset="utf-8"> | |
<style> | |
body { | |
background: #fcfcfa; | |
} | |
</style> | |
<body> | |
<script src="//d3js.org/d3.v3.min.js"></script> | |
<script src="//d3js.org/topojson.v1.min.js"></script> | |
<script> | |
var width = 960, | |
height = 960, | |
speed = -1e-2, | |
start = Date.now(); | |
var sphere = {type: "Sphere"}; | |
var projection = d3.geo.orthographic() | |
.scale(width / 2.1) | |
.clipAngle(90) | |
.translate([width / 2, height / 2]); | |
var graticule = d3.geo.graticule(); | |
var canvas = d3.select("body").append("canvas") | |
.attr("width", width) | |
.attr("height", height); | |
var context = canvas.node().getContext("2d"); | |
var path = d3.geo.path() | |
.projection(projection) | |
.context(context); | |
d3.json("/mbostock/raw/4090846/world-110m.json", function(error, topo) { | |
if (error) throw error; | |
var land = topojson.feature(topo, topo.objects.land), | |
grid = graticule(); | |
d3.timer(function() { | |
var λ = speed * (Date.now() - start), | |
φ = -15; | |
context.clearRect(0, 0, width, height); | |
context.beginPath(); | |
path(sphere); | |
context.lineWidth = 3; | |
context.strokeStyle = "#000"; | |
context.stroke(); | |
context.fillStyle = "#fff"; | |
context.fill(); | |
context.save(); | |
context.translate(width / 2, 0); | |
context.scale(-1, 1); | |
context.translate(-width / 2, 0); | |
projection.rotate([λ + 180, -φ]); | |
context.beginPath(); | |
path(land); | |
context.fillStyle = "#dadac4"; | |
context.fill(); | |
context.beginPath(); | |
path(grid); | |
context.lineWidth = .5; | |
context.strokeStyle = "rgba(119,119,119,.5)"; | |
context.stroke(); | |
context.restore(); | |
projection.rotate([λ, φ]); | |
context.beginPath(); | |
path(grid); | |
context.lineWidth = .5; | |
context.strokeStyle = "rgba(119,119,119,.5)"; | |
context.stroke(); | |
context.beginPath(); | |
path(land); | |
context.fillStyle = "#737368"; | |
context.fill(); | |
context.lineWidth = .5; | |
context.strokeStyle = "#000"; | |
context.stroke(); | |
}); | |
}); | |
d3.select(self.frameElement).style("height", height + "px"); | |
</script> |
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