Also at https://beta.observablehq.com/@fil/translucent-earth
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April 8, 2018 16:05
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Translucent Earth
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license: gpl-3.0 |
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.
Learn more about bidirectional Unicode characters
<!DOCTYPE html> | |
<meta charset="utf-8"> | |
<body> | |
<script src="https://unpkg.com/d3@4"></script> | |
<script src="https://unpkg.com/topojson"></script> | |
<script src="https://unpkg.com/d3-inertia"></script> | |
<script src="https://unpkg.com/versor"></script> | |
<script> | |
var width = 960, | |
height = 500; | |
var velocity = .01; | |
var projection = d3.geoOrthographic() | |
.rotate([-10,-30]); | |
var canvas = d3.select("body").append("canvas") | |
.attr("width", width) | |
.attr("height", height); | |
var context = canvas.node().getContext("2d"); | |
// retina display | |
var devicePixelRatio = window.devicePixelRatio || 1; | |
canvas.style('width', canvas.attr('width')+'px'); | |
canvas.style('height', canvas.attr('height')+'px'); | |
canvas.attr('width', canvas.attr('width') * devicePixelRatio); | |
canvas.attr('height', canvas.attr('height') * devicePixelRatio); | |
context.scale(devicePixelRatio,devicePixelRatio); | |
var path = d3.geoPath() | |
.projection(projection) | |
.context(context); | |
var backprojection = d3.geoProjection(function(a,b) { | |
return d3.geoOrthographicRaw(-a,b); | |
}) | |
.clipAngle(90) | |
.translate(projection.translate()) | |
.scale(projection.scale()); | |
var backpath = d3.geoPath() | |
.projection(backprojection) | |
.context(context); | |
d3.json("https://unpkg.com/world-atlas/world/110m.json", function(error, world) { | |
if (error) throw error; | |
var land = topojson.feature(world, world.objects.land); | |
d3.timer(function(elapsed) { | |
var rotate = projection.rotate(); | |
rotate[0] += velocity * 20; | |
projection.rotate(rotate); | |
render(); | |
}); | |
function render() { | |
var rotate = projection.rotate(); | |
backprojection.rotate([rotate[0] + 180, -rotate[1], -rotate[2]]); | |
context.clearRect(0, 0, width, height); | |
context.beginPath(); | |
path({type:"Sphere"}); | |
context.fillStyle = '#fcfcfc'; | |
context.fill(); | |
context.beginPath(); | |
backpath(land); | |
context.fillStyle = '#d0ddfa'; | |
context.fill(); | |
context.beginPath(); | |
backpath(d3.geoGraticule()()); | |
context.lineWidth = .1; | |
context.strokeStyle = '#97b3f6'; | |
context.stroke(); | |
context.beginPath(); | |
path(d3.geoGraticule()()); | |
context.lineWidth = .1; | |
context.strokeStyle = '#1046c6'; | |
context.stroke(); | |
context.beginPath(); | |
path(land); | |
context.lineWidth = 1; | |
context.strokeStyle = '#1046c6'; | |
context.stroke(); | |
context.fillStyle = '#5c88ee'; | |
var alpha = context.globalAlpha; | |
context.globalAlpha = 1; | |
context.fill(); | |
context.globalAlpha = alpha; | |
context.beginPath(); | |
path({type: "Sphere"}); | |
context.lineWidth = .1; | |
context.strokeStyle = '#1046c6'; | |
context.stroke(); | |
} | |
d3.geoInertiaDrag(canvas, render); | |
canvas.style('cursor', 'move') | |
}); | |
</script> |
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