64 строки
1.5 KiB
JavaScript
64 строки
1.5 KiB
JavaScript
var fs = require("fs"),
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d3 = require("../../");
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var formatNumber = d3.format(",.02r"),
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projection = d3.geo.stereographic().clipAngle(150),
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path = d3.geo.path().projection(projection),
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graticule = d3.geo.graticule().step([1, 1]),
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circle = d3.geo.circle().angle(30),
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n = 10,
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o,
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then;
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o = JSON.parse(fs.readFileSync("./test/data/us-counties.json"));
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then = Date.now();
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for (var i = 0, k = 0; i < n; i++, k++) {
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path(o);
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}
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console.log("U.S. counties: " + formatNumber((Date.now() - then) / k) + "ms/op.");
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o = graticule();
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then = Date.now();
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for (var i = 0, k = 0; i < n; i++, k++) {
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path(o);
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}
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console.log("Dense graticule: " + formatNumber((Date.now() - then) / k) + "ms/op.");
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o = {type: "GeometryCollection", geometries: d3.range(-180, 180, 1).map(function(x) {
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return circle.origin([x, 0])();
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})};
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then = Date.now();
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for (var i = 0, k = 0; i < n; i++, k++) {
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path(o);
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}
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console.log("Circle polygons: " + formatNumber((Date.now() - then) / k) + "ms/op.");
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o = spiral();
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then = Date.now();
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for (var i = 0, k = 0; i < n; i++, k++) {
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path(o);
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}
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console.log("Spiral polygons: " + formatNumber((Date.now() - then) / k) + "ms/op.");
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function spiral() {
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var n = 1e4,
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dy = 5;
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var spiral = d3.range(0, 1 + 1 / n, 1 / n).map(function(t) {
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return [(360 * 10 * t) % 360 - 180, -90 + dy + (90 - dy) * 2 * t];
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}).concat(d3.range(1, 0, -1 / n).map(function(t) {
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return [(360 * 10 * t) % 360 - 180, -90 + (90 - dy) * 2 * t];
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}));
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spiral.push(spiral[0]);
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return {type: "Polygon", coordinates: [spiral]};
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}
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