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Display OTU for dives using air

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Zero o2 means 20.9% o2, which can be confusing...

Signed-off-by: Henrik Brautaset Aronsen <subsurface@henrik.synth.no>
This commit is contained in:
Henrik Brautaset Aronsen 2011-12-31 17:00:36 +01:00
parent e5b6bfc7ed
commit 2175226580
1 changed files with 4 additions and 2 deletions
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6
divelist.c
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@ -392,8 +392,10 @@ static int calculate_otu(struct dive *dive)
struct sample *sample = dive->sample + i;
struct sample *psample = sample - 1;
t = sample->time.seconds - psample->time.seconds;
po2 = dive->cylinder[sample->cylinderindex].gasmix.o2.permille / 1000.0 *
(sample->depth.mm + 10000) / 10000.0;
int o2 = dive->cylinder[sample->cylinderindex].gasmix.o2.permille;
if (!o2)
o2 = 209;
po2 = o2 / 1000.0 * (sample->depth.mm + 10000) / 10000.0;
if (po2 >= 0.5)
otu += pow(po2 - 0.5, 0.83) * t / 30.0;
}