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core: move get_distance() from divesite.cpp to units.cpp

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This gives the distance between to location_t objects. It is
unclear why this was in divesite.cpp.

Moreover pass by value, not raw pointer.

Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>
This commit is contained in:
Berthold Stoeger 2024-05-11 15:18:37 +02:00 • committed by bstoeger
parent 2de6f69c19
commit 7d7766be9a
9 changed files with 30 additions and 30 deletions
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19
core/units.cpp
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@ -180,3 +180,22 @@ const struct units *get_units()
{
return &prefs.units;
}
// Calculate the distance in meters between two coordinates.
unsigned int get_distance(location_t loc1, location_t loc2)
{
double lat1_r = udeg_to_radians(loc1.lat.udeg);
double lat2_r = udeg_to_radians(loc2.lat.udeg);
double lat_d_r = udeg_to_radians(loc2.lat.udeg - loc1.lat.udeg);
double lon_d_r = udeg_to_radians(loc2.lon.udeg - loc1.lon.udeg);
double a = sin(lat_d_r/2) * sin(lat_d_r/2) +
cos(lat1_r) * cos(lat2_r) * sin(lon_d_r/2) * sin(lon_d_r/2);
if (a < 0.0) a = 0.0;
if (a > 1.0) a = 1.0;
double c = 2 * atan2(sqrt(a), sqrt(1.0 - a));
// Earth radius in metres
return lrint(6371000 * c);
}