test/geo/path-benchmark

#!/usr/bin/env node

var fs = require("fs"),
    d3 = require("../../");

var formatNumber = d3.format(",.02r"),
    projection = d3.geo.stereographic().clipAngle(150).clipExtent([[0, 0], [960, 500]]),
    path = d3.geo.path().projection(projection),
    projection0 = d3.geo.mercator().precision(0),
    path0 = d3.geo.path().projection(projection0),
    graticule = d3.geo.graticule().step([1, 1]),
    circle = d3.geo.circle().angle(30),
    n = 10,
    o,
    then;

o = circle();
then = Date.now();

for (var i = 0, k = 0; i < n * 1000; i++, k++) {
  path(o);
}

console.log("Single circle: " + formatNumber((Date.now() - then) / k) + "ms/op.");

o = JSON.parse(fs.readFileSync("./test/data/us-counties.json")).features;
then = Date.now();

for (var i = 0, k = 0; i < n; i++, k++) {
  for (var j = 0, m = o.length; j < m; ++j) {
    path(o[j]);
  }
}

console.log("U.S. counties (separate): " + formatNumber((Date.now() - then) / k) + "ms/op.");

o = JSON.parse(fs.readFileSync("./test/data/us-counties.json"));
then = Date.now();

for (var i = 0, k = 0; i < n; i++, k++) {
  path(o);
}

console.log("U.S. counties: " + formatNumber((Date.now() - then) / k) + "ms/op.");

o = JSON.parse(fs.readFileSync("./test/data/world-countries.json"));
then = Date.now();

for (var i = 0, k = 0; i < n; i++, k++) {
  path(o);
}

console.log("World countries: " + formatNumber((Date.now() - then) / k) + "ms/op.");

then = Date.now();

for (var i = 0, k = 0; i < n; i++, k++) {
  path0(o);
}

console.log("World countries precision(0): " + formatNumber((Date.now() - then) / k) + "ms/op.");

o = JSON.parse(fs.readFileSync("./test/data/ocean.json"));
then = Date.now();

for (var i = 0, k = 0; i < n; i++, k++) {
  path(o);
}

console.log("Ocean: " + formatNumber((Date.now() - then) / k) + "ms/op.");

o = graticule();
then = Date.now();

for (var i = 0, k = 0; i < n; i++, k++) {
  path(o);
}

console.log("Dense graticule: " + formatNumber((Date.now() - then) / k) + "ms/op.");

o = {type: "GeometryCollection", geometries: d3.range(-180, 180, 1).map(function(x) {
  return circle.origin([x, 0])();
})};
then = Date.now();

for (var i = 0, k = 0; i < n; i++, k++) {
  path(o);
}

console.log("Circle polygons: " + formatNumber((Date.now() - then) / k) + "ms/op.");

o = spiral();
then = Date.now();

for (var i = 0, k = 0; i < n; i++, k++) {
  path(o);
}

console.log("Spiral polygons: " + formatNumber((Date.now() - then) / k) + "ms/op.");

function spiral() {
  var n = 1e4,
      dy = 5;

  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]);

  return {type: "Polygon", coordinates: [spiral]};
}