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| license: gpl-3.0 | |
| redirect: https://observablehq.com/@d3/rotating-orthographic |
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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 = 720, | |
| speed = 1e-2, | |
| start = Date.now(); | |
| var sphere = {type: "Sphere"}; | |
| var projection = d3.geo.orthographic() | |
| .scale(height / 2.1) | |
| .translate([width / 2, height / 2]) | |
| .clipAngle(90) | |
| .precision(.5); | |
| 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), | |
| borders = topojson.mesh(topo, topo.objects.countries, function(a, b) { return a !== b; }), | |
| grid = graticule(); | |
| d3.timer(function() { | |
| projection.rotate([speed * (Date.now() - start), -15]); | |
| context.clearRect(0, 0, width, height); | |
| context.beginPath(); | |
| path(sphere); | |
| context.lineWidth = 3; | |
| context.strokeStyle = "#000"; | |
| context.stroke(); | |
| context.beginPath(); | |
| path(sphere); | |
| context.fillStyle = "#fff"; | |
| context.fill(); | |
| context.beginPath(); | |
| path(land); | |
| context.fillStyle = "#222"; | |
| context.fill(); | |
| context.beginPath(); | |
| path(borders); | |
| context.lineWidth = .5; | |
| context.strokeStyle = "#fff"; | |
| context.stroke(); | |
| context.beginPath(); | |
| path(grid); | |
| context.lineWidth = .5; | |
| context.strokeStyle = "rgba(119,119,119,.5)"; | |
| context.stroke(); | |
| }); | |
| }); | |
| d3.select(self.frameElement).style("height", height + "px"); | |
| </script> |
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hello good, I'm new using the library and I'm not very familiar with the respective labels, my questions about this example are: