This is not a globe. This is a globe.
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This Is Not a Globe
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| license: gpl-3.0 | |
| redirect: https://observablehq.com/@mbostock/fake-globes |
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <body> | |
| <script src="//d3js.org/d3.v3.min.js"></script> | |
| <script src="//d3js.org/topojson.v1.min.js"></script> | |
| <script> | |
| var width = 960, | |
| height = 600; | |
| var radius = height / 2 - 5, | |
| scale = radius * 2 / Math.PI, | |
| offset = radius * 4, | |
| velocity = .1; | |
| var projection = d3.geo.equirectangular() | |
| .scale(scale) | |
| .precision(0); | |
| 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, world) { | |
| if (error) throw error; | |
| var land = topojson.feature(world, world.objects.land); | |
| d3.timer(function(elapsed) { | |
| context.clearRect(0, 0, width, height); | |
| context.save(); | |
| context.beginPath(); | |
| context.arc(width / 2, height / 2, radius, 0, 2 * Math.PI, true); | |
| context.clip(); | |
| var x = velocity * elapsed % offset; | |
| if (x > offset / 2) x -= offset; | |
| projection.translate([x, height / 2]); | |
| context.beginPath(); | |
| path(land); | |
| context.fill(); | |
| projection.translate([x + offset, height / 2]); | |
| context.beginPath(); | |
| path(land); | |
| context.fill(); | |
| context.restore(); | |
| context.beginPath(); | |
| context.arc(width / 2, height / 2, radius, 0, 2 * Math.PI, true); | |
| context.lineWidth = 2.5; | |
| context.stroke(); | |
| }); | |
| }); | |
| d3.select(self.frameElement).style("height", height + "px"); | |
| </script> |
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