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Calculate the gas used during the planned dive

Browse source 
This works on the assumption that the diver uses the deco SAC rate while
on a calculated deco stop and the bottom SAC rate during the rest of the
dive (including the time they move from deco stop to deco stop).

This is making the planning function mostly useful for open circuit
diving.

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
This commit is contained in:
Dirk Hohndel 2013-01-15 17:24:17 -08:00
parent c3a08ff056
commit db8de4233d
1 changed files with 24 additions and 1 deletions
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25
planner.c
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@ -431,7 +431,8 @@ static int *sort_stops(int *dstops, int dnr, struct gaschanges *gstops, int gnr)
static void add_plan_to_notes(struct diveplan *diveplan, struct dive *dive)
{
char buffer[2000];
int len, lastdepth = 0, lasttime = 0;
int consumption[MAX_CYLINDERS] = { 0, };
int len, gasidx, lastdepth = 0, lasttime = 0;
struct divedatapoint *dp = diveplan->dp;
int o2, he;
@ -448,6 +449,7 @@ static void add_plan_to_notes(struct diveplan *diveplan, struct dive *dive)
char gas[12];
double depthvalue;
int decimals;
double used;
int newo2 = o2, newhe = he;
struct divedatapoint *nextdp;
@ -473,20 +475,27 @@ static void add_plan_to_notes(struct diveplan *diveplan, struct dive *dive)
if (!dp->entered && o2 == newo2 && he == newhe && nextdp && dp->depth != lastdepth && nextdp->depth != dp->depth)
continue;
get_gas_string(o2, he, gas, 12);
gasidx = get_gasidx(dive, o2, he);
len = strlen(buffer);
if (dp->depth != lastdepth) {
used = diveplan->bottomsac / 1000.0 * depth_to_mbar((dp->depth + lastdepth) / 2, dive) *
(dp->time - lasttime) / 60;
snprintf(buffer + len, sizeof(buffer) - len, "Transition to %.*f %s in %d:%02d min - runtime %d:%02u on %s\n",
decimals, depthvalue, depth_unit,
FRACTION(dp->time - lasttime, 60),
FRACTION(dp->time, 60),
gas);
} else {
/* we use deco SAC rate during the calculated deco stops, bottom SAC rate everywhere else */
int sac = dp->entered ? diveplan->bottomsac : diveplan->decosac;
used = sac / 1000.0 * depth_to_mbar(dp->depth, dive) * (dp->time - lasttime) / 60;
snprintf(buffer + len, sizeof(buffer) - len, "Stay at %.*f %s for %d:%02d min - runtime %d:%02u on %s\n",
decimals, depthvalue, depth_unit,
FRACTION(dp->time - lasttime, 60),
FRACTION(dp->time, 60),
gas);
}
consumption[gasidx] += used;
get_gas_string(newo2, newhe, gas, 12);
if (o2 != newo2 || he != newhe) {
len = strlen(buffer);
@ -497,6 +506,20 @@ static void add_plan_to_notes(struct diveplan *diveplan, struct dive *dive)
lasttime = dp->time;
lastdepth = dp->depth;
} while((dp = dp->next) != NULL);
len = strlen(buffer);
snprintf(buffer + len, sizeof(buffer) - len, "Gas consumption:\n");
for (gasidx = 0; gasidx < MAX_CYLINDERS; gasidx++) {
double volume;
const char *unit;
char gas[12];
if (consumption[gasidx] == 0)
continue;
len = strlen(buffer);
volume = get_volume_units(consumption[gasidx], NULL, &unit);
get_gas_string(dive->cylinder[gasidx].gasmix.o2.permille,
dive->cylinder[gasidx].gasmix.he.permille, gas, 12);
snprintf(buffer + len, sizeof(buffer) - len, "%.0f%s of %s\n", volume, unit, gas);
}
dive->notes = strdup(buffer);
}