Created
July 9, 2012 12:59
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Geographic Clipping: Spiral
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <title>Geographic Clipping of Spiral</title> | |
| <body> | |
| <script src="http://d3js.org/d3.v2.min.js"></script> | |
| <script src="https://raw.github.com/d3/d3-plugins/clip/geo/clip/clip.js"></script> | |
| <script> | |
| var xy = d3.geo.azimuthal().scale(200).mode("orthographic").origin([0, 90]), | |
| dy = 5, | |
| clip = d3.geo.clip().origin([0, 90]), | |
| path = d3.geo.path().projection(xy), | |
| svg = d3.select("body").append("svg"), | |
| n = 1000; | |
| var origin = [0, 0], | |
| velocity = [.01, .01], | |
| t0 = Date.now(); | |
| var spiral = d3.range(0, 1 + 1 / n, 1 / n).map(function(t) { | |
| return [(360 * 10 * t) % 360 - 180, -90 + dy + (90 - dy) * 2 * t]; | |
| }).concat(d3.range(1, 0, -1 / n).map(function(t) { | |
| return [(360 * 10 * t) % 360 - 180, -90 + (90 - dy) * 2 * t]; | |
| })); | |
| spiral.push(spiral[0]); | |
| var a = svg.append("path") | |
| .datum({type: "Polygon", coordinates: [spiral]}); | |
| d3.timer(function() { | |
| var t = Date.now() - t0, | |
| o = [origin[0] + t * velocity[0], origin[1] + t * velocity[1]]; | |
| xy.origin(o); | |
| clip.origin(o); | |
| a.attr("d", function(d) { return path(clip(d)); }); | |
| }); | |
| </script> |
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clip branch is missing for this one too