Also at https://beta.observablehq.com/@fil/translucent-earth
Last active
April 8, 2018 16:05
-
-
Save Fil/7db0a78e042c5bfaa807f44bd6c58aa2 to your computer and use it in GitHub Desktop.
Translucent Earth
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
| 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> |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment