forked from jasondavies's block: Geographic Clipping: Spiral [UNLISTED]
Last active
October 31, 2018 13:11
Geographic Clipping: Spiral [UNLISTED]
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license: mit |
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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.githack.com/d3/d3-plugins/67c2f21e93e9a589dd17038c3b2e69f58ddfd8f2/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") | |
.attr('width', 960) | |
.attr('height', 600) | |
, | |
n = 1000; | |
var origin = [0, 0], | |
velocity = [.1, .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]}) | |
.attr("d", path); | |
//if (0) | |
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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