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Round MOD of gas rather than truncate

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For the proper calculation, we need to take salinity and surface pressure
into account (rather than depth = bar * 10 - 10)

Signed-off-by: Robert C. Helling <helling@atdotde.de>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
This commit is contained in:
Robert C. Helling 2015-07-06 00:07:39 +02:00 • committed by Dirk Hohndel
parent 9c6a3a7ff3
commit a7d18a9fa6
6 changed files with 24 additions and 12 deletions
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26
dive.h
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@ -167,13 +167,6 @@ static inline int interpolate(int a, int b, int part, int whole)
return rint(x / whole);
}
/* MOD rounded to multiples of roundto mm */
static inline depth_t gas_mod(struct gasmix *mix, pressure_t po2_limit, int roundto) {
depth_t depth;
depth.mm = ((po2_limit.mbar * 1000 / get_o2(mix) * 10 - 10000) / roundto) * roundto;
return depth;
}
void get_gas_string(const struct gasmix *gasmix, char *text, int len);
const char *gasname(const struct gasmix *gasmix);
@ -445,6 +438,25 @@ static inline int rel_mbar_to_depth(int mbar, struct dive *dive)
return cm * 10;
}
static inline int mbar_to_depth(int mbar, struct dive *dive)
{
pressure_t surface_pressure;
if (dive->surface_pressure.mbar)
surface_pressure = dive->surface_pressure;
else
surface_pressure.mbar = SURFACE_PRESSURE;
return rel_mbar_to_depth(mbar - surface_pressure.mbar, dive);
}
/* MOD rounded to multiples of roundto mm */
static inline depth_t gas_mod(struct gasmix *mix, pressure_t po2_limit, struct dive *dive, int roundto) {
depth_t rounded_depth;
double depth = (double) mbar_to_depth(po2_limit.mbar * 1000 / get_o2(mix), dive);
rounded_depth.mm = rint(depth / roundto) * roundto;
return rounded_depth;
}
#define SURFACE_THRESHOLD 750 /* somewhat arbitrary: only below 75cm is it really diving */
/* this is a global spot for a temporary dive structure that we use to