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Cache trig and combine deg2rad in heading() #16

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Merged
gistrec merged 1 commit into from
May 9, 2026
Merged

Cache trig and combine deg2rad in heading() #16

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12 changes: 7 additions & 5 deletions include/geo/spherical.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -29,13 +29,15 @@ namespace geo {
*/
[[nodiscard]] inline double heading(const LatLng& from, const LatLng& to) noexcept {
double from_lat = detail::deg2rad(from.lat);
double from_lng = detail::deg2rad(from.lng);
double to_lat = detail::deg2rad(to.lat);
double to_lng = detail::deg2rad(to.lng);
double d_lng = to_lng - from_lng;
double d_lng = detail::deg2rad(to.lng - from.lng);
double cos_to_lat = std::cos(to_lat);
double sin_to_lat = std::sin(to_lat);
double cos_from_lat = std::cos(from_lat);
double sin_from_lat = std::sin(from_lat);
double h = std::atan2(
std::sin(d_lng) * std::cos(to_lat),
std::cos(from_lat) * std::sin(to_lat) - std::sin(from_lat) * std::cos(to_lat) * std::cos(d_lng));
std::sin(d_lng) * cos_to_lat,
cos_from_lat * sin_to_lat - sin_from_lat * cos_to_lat * std::cos(d_lng));

return detail::wrap(detail::rad2deg(h), -180.0, 180.0);
}
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