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refactor cheap ruler cache

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Huyen Chau Nguyen 2018-04-25 10:59:07 -04:00 committed by Patrick Niklaus
parent a6cf2eee7e
commit 5ba26d3d6d
1 changed files with 18 additions and 21 deletions
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39
src/util/coordinate_calculation.cpp
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@ -22,26 +22,23 @@ namespace coordinate_calculation
namespace
{
mapbox::cheap_ruler::CheapRuler cheap_ruler_cache[] = {
mapbox::cheap_ruler::CheapRuler(-90, mapbox::cheap_ruler::CheapRuler::Meters),
mapbox::cheap_ruler::CheapRuler(-80, mapbox::cheap_ruler::CheapRuler::Meters),
mapbox::cheap_ruler::CheapRuler(-70, mapbox::cheap_ruler::CheapRuler::Meters),
mapbox::cheap_ruler::CheapRuler(-60, mapbox::cheap_ruler::CheapRuler::Meters),
mapbox::cheap_ruler::CheapRuler(-50, mapbox::cheap_ruler::CheapRuler::Meters),
mapbox::cheap_ruler::CheapRuler(-40, mapbox::cheap_ruler::CheapRuler::Meters),
mapbox::cheap_ruler::CheapRuler(-30, mapbox::cheap_ruler::CheapRuler::Meters),
mapbox::cheap_ruler::CheapRuler(-20, mapbox::cheap_ruler::CheapRuler::Meters),
mapbox::cheap_ruler::CheapRuler(-10, mapbox::cheap_ruler::CheapRuler::Meters),
mapbox::cheap_ruler::CheapRuler(0, mapbox::cheap_ruler::CheapRuler::Meters),
mapbox::cheap_ruler::CheapRuler(10, mapbox::cheap_ruler::CheapRuler::Meters),
mapbox::cheap_ruler::CheapRuler(20, mapbox::cheap_ruler::CheapRuler::Meters),
mapbox::cheap_ruler::CheapRuler(30, mapbox::cheap_ruler::CheapRuler::Meters),
mapbox::cheap_ruler::CheapRuler(40, mapbox::cheap_ruler::CheapRuler::Meters),
mapbox::cheap_ruler::CheapRuler(50, mapbox::cheap_ruler::CheapRuler::Meters),
mapbox::cheap_ruler::CheapRuler(60, mapbox::cheap_ruler::CheapRuler::Meters),
mapbox::cheap_ruler::CheapRuler(70, mapbox::cheap_ruler::CheapRuler::Meters),
mapbox::cheap_ruler::CheapRuler(80, mapbox::cheap_ruler::CheapRuler::Meters),
mapbox::cheap_ruler::CheapRuler(90, mapbox::cheap_ruler::CheapRuler::Meters)};
class CheapRulerContainer {
public:
CheapRulerContainer(const int number_of_rulers)
: cheap_ruler_cache(number_of_rulers, mapbox::cheap_ruler::CheapRuler(0)), step(180. / number_of_rulers){
for (int n = 0; n < number_of_rulers; n++) {
cheap_ruler_cache[n] = mapbox::cheap_ruler::CheapRuler(-90 + step * n, mapbox::cheap_ruler::CheapRuler::Meters);
}
};
mapbox::cheap_ruler::CheapRuler& getRuler(const double lat) {
return cheap_ruler_cache[std::min((int)std::round((lat + 90)/step), (int)cheap_ruler_cache.size() - 1)];
};
private:
std::vector<mapbox::cheap_ruler::CheapRuler> cheap_ruler_cache;
const double step;
};
CheapRulerContainer cheap_ruler_container(3600);
}
// Does not project the coordinates!
@ -68,7 +65,7 @@ double fccApproximateDistance(const Coordinate coordinate_1, const Coordinate co
const auto lat1 = static_cast<double>(util::toFloating(coordinate_1.lat));
const auto lon2 = static_cast<double>(util::toFloating(coordinate_2.lon));
const auto lat2 = static_cast<double>(util::toFloating(coordinate_2.lat));
return cheap_ruler_cache[std::lround(lat1 / 10) + 9].distance({lon1, lat1}, {lon2, lat2});
return cheap_ruler_container.getRuler(lat1).distance({lon1, lat1}, {lon2, lat2});
}
double haversineDistance(const Coordinate coordinate_1, const Coordinate coordinate_2)