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core: let pressure_to_altitude return a depth_t

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Also un-inline it. There seems no reason for exporting the
implementation details in the header file.

Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>
This commit is contained in:
Berthold Stoeger 2024-12-14 21:03:23 +01:00 • committed by Michael Keller
parent 4237cb9999
commit 1d14b03935
5 changed files with 13 additions and 11 deletions
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5
core/units.cpp
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@ -204,3 +204,8 @@ depth_t m_or_ft(int m, int ft)
int mm = prefs.units.length == units::METERS ? m * 1000 : feet_to_mm(ft);
return depth_t::from_base(mm);
}
depth_t pressure_to_altitude(pressure_t pressure)
{ // returns altitude in mm above sea level
return depth_t::from_base(static_cast<int32_t>(log(1013.0 / pressure.mbar) * 7800000));
}