bool is_cylinder_used(struct dive *dive, int idx)
{
struct divecomputer *dc;
bool firstGasExplicit = false;
if (cylinder_none(&dive->cylinder[idx]))
return false;
if ((dive->cylinder[idx].start.mbar - dive->cylinder[idx].end.mbar) > SOME_GAS)
return true;
for_each_dc(dive, dc) {
struct event *event = get_next_event(dc->events, "gaschange");
while (event) {
if (dc->sample && (event->time.seconds == 0 ||
(dc->samples && dc->sample[0].time.seconds == event->time.seconds)))
firstGasExplicit = true;
if (get_cylinder_index(dive, event) == idx)
return true;
event = get_next_event(event->next, "gaschange");
}
if (dc->divemode == CCR && (idx == dive->diluent_cylinder_index || idx == dive->oxygen_cylinder_index))
return true;
}
if (idx == 0 && !firstGasExplicit)
return true;
return false;
}
/* get the gas at a certain time during the dive */
void get_gas_at_time(struct dive *dive, struct divecomputer *dc, duration_t time, struct gasmix *gas)
{
// we always start with the first gas, so that's our gas
// unless an event tells us otherwise
struct event *event = dc->events;
*gas = dive->cylinder[0].gasmix;
while (event && event->time.seconds <= time.seconds) {
if (!strcmp(event->name, "gaschange")) {
int cylinder_idx = get_cylinder_index(dive, event);
*gas = dive->cylinder[cylinder_idx].gasmix;
}
event = event->next;
}
}
static void check_gas_change_events(struct dive *dive, struct divecomputer *dc, struct plot_info *pi)
{
int i = 0, cylinderindex = 0;
struct event *ev = get_next_event(dc->events, "gaschange");
// for dive computers that tell us their first gas as an event on the first sample
// we need to make sure things are setup correctly
cylinderindex = explicit_first_cylinder(dive, dc);
set_first_cylinder_index(pi, 0, cylinderindex, ~0u);
if (!ev)
return;
do {
i = set_cylinder_index(pi, i, cylinderindex, ev->time.seconds);
cylinderindex = get_cylinder_index(dive, ev);
ev = get_next_event(ev->next, "gaschange");
} while (ev);
set_cylinder_index(pi, i, cylinderindex, ~0u);
}
bool is_cylinder_used(struct dive *dive, int idx)
{
struct divecomputer *dc;
bool firstGasExplicit = false;
if (cylinder_none(&dive->cylinder[idx]))
return false;
for_each_dc(dive, dc) {
struct event *event = get_next_event(dc->events, "gaschange");
while (event) {
if (event->time.seconds < 30)
firstGasExplicit = true;
if (get_cylinder_index(dive, event) == idx)
return true;
event = get_next_event(event->next, "gaschange");
}
}
if (idx == 0 && !firstGasExplicit)
return true;
return false;
}