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Use the improved duration and average depth for everything

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The code was written to get the SAC rate correct, but we probably do
want to have the duration and mean depth of the dive always be shown for
the non-surface-time.

So move the code from the sac-rate calculation to the generic dive fixup
part.  This makes the dive list and statistics all show the duration as
the under-water duration, which is not necessarily the same as
"difference between beginning and end of dive".

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
This commit is contained in:
Linus Torvalds 2013-02-24 11:39:51 -08:00 • committed by Dirk Hohndel
parent b62e63650a
commit 7b20fb826c
2 changed files with 42 additions and 78 deletions
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48
divelist.c
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@ -719,46 +719,6 @@ static double calculate_airuse(struct dive *dive)
return airuse;
}
/*
* Calculate how long we were actually under water, and the average
* depth while under water.
*
* This ignores any surface time in the middle of the dive.
*/
static int calculate_duration(struct dive *dive, struct divecomputer *dc, int *meandepth)
{
int duration, i;
int lasttime, lastdepth, depthtime;
duration = 0;
lasttime = 0;
lastdepth = 0;
depthtime = 0;
for (i = 0; i < dc->samples; i++) {
struct sample *sample = dc->sample + i;
int time = sample->time.seconds;
int depth = sample->depth.mm;
/* We ignore segments at the surface */
if (depth > SURFACE_THRESHOLD || lastdepth > SURFACE_THRESHOLD) {
duration += time - lasttime;
depthtime += (time - lasttime)*(depth+lastdepth)/2;
}
lastdepth = depth;
lasttime = time;
}
if (duration) {
if (meandepth)
*meandepth = depthtime / duration;
return duration;
}
/* No samples? */
if (meandepth)
*meandepth = dive->meandepth.mm;
return dive->duration.seconds;
}
/* this only uses the first divecomputer to calculate the SAC rate */
static int calculate_sac(struct dive *dive)
{
@ -770,12 +730,14 @@ static int calculate_sac(struct dive *dive)
if (!airuse)
return 0;
duration = calculate_duration(dive, dc, &meandepth);
/* find and eliminate long surface intervals */
duration = dc->duration.seconds;
if (!duration)
return 0;
meandepth = dc->meandepth.mm;
if (!meandepth)
return 0;
/* Mean pressure in ATM (SAC calculations are in atm*l/min) */
pressure = (double) depth_to_mbar(meandepth, dive) / SURFACE_PRESSURE;
sac = airuse / pressure * 60 / duration;