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profile.c
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profile.c
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/* profile.c */
/* creates all the necessary data for drawing the dive profile
*/
#include "gettext.h"
#include <limits.h>
#include <string.h>
#include <assert.h>
#include "dive.h"
#include "display.h"
#include "divelist.h"
#include "profile.h"
#include "gaspressures.h"
#include "deco.h"
#include "libdivecomputer/parser.h"
#include "libdivecomputer/version.h"
#include "membuffer.h"
//#define DEBUG_GAS 1
int selected_dive = -1; /* careful: 0 is a valid value */
unsigned int dc_number = 0;
static struct plot_data *last_pi_entry_new = NULL;
void populate_pressure_information(struct dive *, struct divecomputer *, struct plot_info *, int);
#ifdef DEBUG_PI
/* debugging tool - not normally used */
static void dump_pi(struct plot_info *pi)
{
int i;
printf("pi:{nr:%d maxtime:%d meandepth:%d maxdepth:%d \n"
" maxpressure:%d mintemp:%d maxtemp:%d\n",
pi->nr, pi->maxtime, pi->meandepth, pi->maxdepth,
pi->maxpressure, pi->mintemp, pi->maxtemp);
for (i = 0; i < pi->nr; i++) {
struct plot_data *entry = &pi->entry[i];
printf(" entry[%d]:{cylinderindex:%d sec:%d pressure:{%d,%d}\n"
" time:%d:%02d temperature:%d depth:%d stopdepth:%d stoptime:%d ndl:%d smoothed:%d po2:%lf phe:%lf pn2:%lf sum-pp %lf}\n",
i, entry->cylinderindex, entry->sec,
entry->pressure[0], entry->pressure[1],
entry->sec / 60, entry->sec % 60,
entry->temperature, entry->depth, entry->stopdepth, entry->stoptime, entry->ndl, entry->smoothed,
entry->pressures.o2, entry->pressures.he, entry->pressures.n2,
entry->pressures.o2 + entry->pressures.he + entry->pressures.n2);
}
printf(" }\n");
}
#endif
#define ROUND_UP(x, y) ((((x) + (y) - 1) / (y)) * (y))
#define DIV_UP(x, y) (((x) + (y) - 1) / (y))
/*
* When showing dive profiles, we scale things to the
* current dive. However, we don't scale past less than
* 30 minutes or 90 ft, just so that small dives show
* up as such unless zoom is enabled.
* We also need to add 180 seconds at the end so the min/max
* plots correctly
*/
int get_maxtime(struct plot_info *pi)
{
int seconds = pi->maxtime;
if (prefs.zoomed_plot) {
/* Rounded up to one minute, with at least 2.5 minutes to
* spare.
* For dive times shorter than 10 minutes, we use seconds/4 to
* calculate the space dynamically.
* This is seamless since 600/4 = 150.
*/
if (seconds < 600)
return ROUND_UP(seconds + seconds / 4, 60);
else
return ROUND_UP(seconds + 150, 60);
} else {
/* min 30 minutes, rounded up to 5 minutes, with at least 2.5 minutes to spare */
return MAX(30 * 60, ROUND_UP(seconds + 150, 60 * 5));
}
}
/* get the maximum depth to which we want to plot
* take into account the additional vertical space needed to plot
* partial pressure graphs */
int get_maxdepth(struct plot_info *pi)
{
unsigned mm = pi->maxdepth;
int md;
if (prefs.zoomed_plot) {
/* Rounded up to 10m, with at least 3m to spare */
md = ROUND_UP(mm + 3000, 10000);
} else {
/* Minimum 30m, rounded up to 10m, with at least 3m to spare */
md = MAX((unsigned)30000, ROUND_UP(mm + 3000, 10000));
}
md += pi->maxpp * 9000;
return md;
}
/* collect all event names and whether we display them */
struct ev_select *ev_namelist;
int evn_allocated;
int evn_used;
#if WE_DONT_USE_THIS /* we need to implement event filters in Qt */
int evn_foreach (void (*callback)(const char *, bool *, void *), void *data) {
int i;
for (i = 0; i < evn_used; i++) {
/* here we display an event name on screen - so translate */
callback(translate("gettextFromC", ev_namelist[i].ev_name), &ev_namelist[i].plot_ev, data);
}
return i;
}
#endif /* WE_DONT_USE_THIS */
void clear_events(void)
{
for (int i = 0; i < evn_used; i++)
free(ev_namelist[i].ev_name);
evn_used = 0;
}
void remember_event(const char *eventname)
{
int i = 0, len;
if (!eventname || (len = strlen(eventname)) == 0)
return;
while (i < evn_used) {
if (!strncmp(eventname, ev_namelist[i].ev_name, len))
return;
i++;
}
if (evn_used == evn_allocated) {
evn_allocated += 10;
ev_namelist = realloc(ev_namelist, evn_allocated * sizeof(struct ev_select));
if (!ev_namelist)
/* we are screwed, but let's just bail out */
return;
}
ev_namelist[evn_used].ev_name = strdup(eventname);
ev_namelist[evn_used].plot_ev = true;
evn_used++;
}
/* Get local sac-rate (in ml/min) between entry1 and entry2 */
static int get_local_sac(struct plot_data *entry1, struct plot_data *entry2, struct dive *dive)
{
int index = entry1->cylinderindex;
cylinder_t *cyl;
int duration = entry2->sec - entry1->sec;
int depth, airuse;
pressure_t a, b;
double atm;
if (entry2->cylinderindex != index)
return 0;
if (duration <= 0)
return 0;
a.mbar = GET_PRESSURE(entry1);
b.mbar = GET_PRESSURE(entry2);
if (!b.mbar || a.mbar <= b.mbar)
return 0;
/* Mean pressure in ATM */
depth = (entry1->depth + entry2->depth) / 2;
atm = depth_to_atm(depth, dive);
cyl = dive->cylinder + index;
airuse = gas_volume(cyl, a) - gas_volume(cyl, b);
/* milliliters per minute */
return airuse / atm * 60 / duration;
}
static void analyze_plot_info_minmax_minute(struct plot_data *entry, struct plot_data *first, struct plot_data *last, int index)
{
struct plot_data *p = entry;
int time = entry->sec;
int seconds = 90 * (index + 1);
struct plot_data *min, *max;
int avg, nr;
/* Go back 'seconds' in time */
while (p > first) {
if (p[-1].sec < time - seconds)
break;
p--;
}
/* Then go forward until we hit an entry past the time */
min = max = p;
avg = p->depth;
nr = 1;
while (++p < last) {
int depth = p->depth;
if (p->sec > time + seconds)
break;
avg += depth;
nr++;
if (depth < min->depth)
min = p;
if (depth > max->depth)
max = p;
}
entry->min[index] = min;
entry->max[index] = max;
entry->avg[index] = (avg + nr / 2) / nr;
}
static void analyze_plot_info_minmax(struct plot_data *entry, struct plot_data *first, struct plot_data *last)
{
analyze_plot_info_minmax_minute(entry, first, last, 0);
analyze_plot_info_minmax_minute(entry, first, last, 1);
analyze_plot_info_minmax_minute(entry, first, last, 2);
}
static velocity_t velocity(int speed)
{
velocity_t v;
if (speed < -304) /* ascent faster than -60ft/min */
v = CRAZY;
else if (speed < -152) /* above -30ft/min */
v = FAST;
else if (speed < -76) /* -15ft/min */
v = MODERATE;
else if (speed < -25) /* -5ft/min */
v = SLOW;
else if (speed < 25) /* very hard to find data, but it appears that the recommendations
for descent are usually about 2x ascent rate; still, we want
stable to mean stable */
v = STABLE;
else if (speed < 152) /* between 5 and 30ft/min is considered slow */
v = SLOW;
else if (speed < 304) /* up to 60ft/min is moderate */
v = MODERATE;
else if (speed < 507) /* up to 100ft/min is fast */
v = FAST;
else /* more than that is just crazy - you'll blow your ears out */
v = CRAZY;
return v;
}
struct plot_info *analyze_plot_info(struct plot_info *pi)
{
int i;
int nr = pi->nr;
/* Smoothing function: 5-point triangular smooth */
for (i = 2; i < nr; i++) {
struct plot_data *entry = pi->entry + i;
int depth;
if (i < nr - 2) {
depth = entry[-2].depth + 2 * entry[-1].depth + 3 * entry[0].depth + 2 * entry[1].depth + entry[2].depth;
entry->smoothed = (depth + 4) / 9;
}
/* vertical velocity in mm/sec */
/* Linus wants to smooth this - let's at least look at the samples that aren't FAST or CRAZY */
if (entry[0].sec - entry[-1].sec) {
entry->speed = (entry[0].depth - entry[-1].depth) / (entry[0].sec - entry[-1].sec);
entry->velocity = velocity(entry->speed);
/* if our samples are short and we aren't too FAST*/
if (entry[0].sec - entry[-1].sec < 15 && entry->velocity < FAST) {
int past = -2;
while (i + past > 0 && entry[0].sec - entry[past].sec < 15)
past--;
entry->velocity = velocity((entry[0].depth - entry[past].depth) /
(entry[0].sec - entry[past].sec));
}
} else {
entry->velocity = STABLE;
entry->speed = 0;
}
}
/* One-, two- and three-minute minmax data */
for (i = 0; i < nr; i++) {
struct plot_data *entry = pi->entry + i;
analyze_plot_info_minmax(entry, pi->entry, pi->entry + nr);
}
return pi;
}
/*
* If the event has an explicit cylinder index,
* we return that. If it doesn't, we return the best
* match based on the gasmix.
*
* Some dive computers give cylinder indexes, some
* give just the gas mix.
*/
int get_cylinder_index(struct dive *dive, struct event *ev)
{
int i;
int best = 0, score = INT_MAX;
int target_o2, target_he;
struct gasmix *g;
if (ev->gas.index >= 0)
return ev->gas.index;
g = get_gasmix_from_event(ev);
target_o2 = get_o2(g);
target_he = get_he(g);
/*
* Try to find a cylinder that best matches the target gas
* mix.
*/
for (i = 0; i < MAX_CYLINDERS; i++) {
cylinder_t *cyl = dive->cylinder + i;
int delta_o2, delta_he, distance;
if (cylinder_nodata(cyl))
continue;
delta_o2 = get_o2(&cyl->gasmix) - target_o2;
delta_he = get_he(&cyl->gasmix) - target_he;
distance = delta_o2 * delta_o2;
distance += delta_he * delta_he;
if (distance >= score)
continue;
score = distance;
best = i;
}
return best;
}
struct event *get_next_event(struct event *event, const char *name)
{
if (!name || !*name)
return NULL;
while (event) {
if (!strcmp(event->name, name))
return event;
event = event->next;
}
return event;
}
static int count_events(struct divecomputer *dc)
{
int result = 0;
struct event *ev = dc->events;
while (ev != NULL) {
result++;
ev = ev->next;
}
return result;
}
static int set_cylinder_index(struct plot_info *pi, int i, int cylinderindex, unsigned int end)
{
while (i < pi->nr) {
struct plot_data *entry = pi->entry + i;
if (entry->sec > end)
break;
if (entry->cylinderindex != cylinderindex) {
entry->cylinderindex = cylinderindex;
entry->pressure[0] = 0;
}
i++;
}
return i;
}
static int set_setpoint(struct plot_info *pi, int i, int setpoint, unsigned int end)
{
while (i < pi->nr) {
struct plot_data *entry = pi->entry + i;
if (entry->sec > end)
break;
entry->o2pressure.mbar = setpoint;
i++;
}
return i;
}
/* normally the first cylinder has index 0... if not, we need to fix this up here */
static int set_first_cylinder_index(struct plot_info *pi, int i, int cylinderindex, unsigned int end)
{
while (i < pi->nr) {
struct plot_data *entry = pi->entry + i;
if (entry->sec > end)
break;
entry->cylinderindex = cylinderindex;
i++;
}
return i;
}
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);
}
static void check_setpoint_events(struct dive *dive, struct divecomputer *dc, struct plot_info *pi)
{
int i = 0;
pressure_t setpoint;
setpoint.mbar = 0;
struct event *ev = get_next_event(dc->events, "SP change");
if (!ev)
return;
do {
i = set_setpoint(pi, i, setpoint.mbar, ev->time.seconds);
setpoint.mbar = ev->value;
if (setpoint.mbar)
dc->divemode = CCR;
ev = get_next_event(ev->next, "SP change");
} while (ev);
set_setpoint(pi, i, setpoint.mbar, ~0u);
}
struct plot_info calculate_max_limits_new(struct dive *dive, struct divecomputer *given_dc)
{
struct divecomputer *dc = &(dive->dc);
bool seen = false;
static struct plot_info pi;
int maxdepth = dive->maxdepth.mm;
int maxtime = 0;
int maxpressure = 0, minpressure = INT_MAX;
int maxhr = 0, minhr = INT_MAX;
int mintemp = dive->mintemp.mkelvin;
int maxtemp = dive->maxtemp.mkelvin;
int cyl;
/* Get the per-cylinder maximum pressure if they are manual */
for (cyl = 0; cyl < MAX_CYLINDERS; cyl++) {
int mbar = dive->cylinder[cyl].start.mbar;
if (mbar > maxpressure)
maxpressure = mbar;
if (mbar < minpressure)
minpressure = mbar;
}
/* Then do all the samples from all the dive computers */
do {
if (dc == given_dc)
seen = true;
int i = dc->samples;
int lastdepth = 0;
struct sample *s = dc->sample;
while (--i >= 0) {
int depth = s->depth.mm;
int pressure = s->cylinderpressure.mbar;
int temperature = s->temperature.mkelvin;
int heartbeat = s->heartbeat;
if (!mintemp && temperature < mintemp)
mintemp = temperature;
if (temperature > maxtemp)
maxtemp = temperature;
if (pressure && pressure < minpressure)
minpressure = pressure;
if (pressure > maxpressure)
maxpressure = pressure;
if (heartbeat > maxhr)
maxhr = heartbeat;
if (heartbeat < minhr)
minhr = heartbeat;
if (depth > maxdepth)
maxdepth = s->depth.mm;
if ((depth > SURFACE_THRESHOLD || lastdepth > SURFACE_THRESHOLD) &&
s->time.seconds > maxtime)
maxtime = s->time.seconds;
lastdepth = depth;
s++;
}
dc = dc->next;
if (dc == NULL && !seen) {
dc = given_dc;
seen = true;
}
} while (dc != NULL);
if (minpressure > maxpressure)
minpressure = 0;
if (minhr > maxhr)
minhr = 0;
memset(&pi, 0, sizeof(pi));
pi.maxdepth = maxdepth;
pi.maxtime = maxtime;
pi.maxpressure = maxpressure;
pi.minpressure = minpressure;
pi.minhr = minhr;
pi.maxhr = maxhr;
pi.mintemp = mintemp;
pi.maxtemp = maxtemp;
return pi;
}
/* copy the previous entry (we know this exists), update time and depth
* and zero out the sensor pressure (since this is a synthetic entry)
* increment the entry pointer and the count of synthetic entries. */
#define INSERT_ENTRY(_time, _depth, _sac) \
*entry = entry[-1]; \
entry->sec = _time; \
entry->depth = _depth; \
entry->running_sum = (entry - 1)->running_sum + (_time - (entry - 1)->sec) * (_depth + (entry - 1)->depth) / 2; \
SENSOR_PRESSURE(entry) = 0; \
entry->sac = _sac; \
entry++; \
idx++
struct plot_data *populate_plot_entries(struct dive *dive, struct divecomputer *dc, struct plot_info *pi)
{
int idx, maxtime, nr, i;
int lastdepth, lasttime, lasttemp = 0;
struct plot_data *plot_data;
struct event *ev = dc->events;
maxtime = pi->maxtime;
/*
* We want to have a plot_info event at least every 10s (so "maxtime/10+1"),
* but samples could be more dense than that (so add in dc->samples). We also
* need to have one for every event (so count events and add that) and
* additionally we want two surface events around the whole thing (thus the
* additional 4). There is also one extra space for a final entry
* that has time > maxtime (because there can be surface samples
* past "maxtime" in the original sample data)
*/
nr = dc->samples + 6 + maxtime / 10 + count_events(dc);
plot_data = calloc(nr, sizeof(struct plot_data));
pi->entry = plot_data;
if (!plot_data)
return NULL;
pi->nr = nr;
idx = 2; /* the two extra events at the start */
lastdepth = 0;
lasttime = 0;
/* skip events at time = 0 */
while (ev && ev->time.seconds == 0)
ev = ev->next;
for (i = 0; i < dc->samples; i++) {
struct plot_data *entry = plot_data + idx;
struct sample *sample = dc->sample + i;
int time = sample->time.seconds;
int offset, delta;
int depth = sample->depth.mm;
int sac = sample->sac.mliter;
/* Add intermediate plot entries if required */
delta = time - lasttime;
if (delta <= 0) {
time = lasttime;
delta = 1; // avoid divide by 0
}
for (offset = 10; offset < delta; offset += 10) {
if (lasttime + offset > maxtime)
break;
/* Add events if they are between plot entries */
while (ev && ev->time.seconds < lasttime + offset) {
INSERT_ENTRY(ev->time.seconds, interpolate(lastdepth, depth, ev->time.seconds - lasttime, delta), sac);
ev = ev->next;
}
/* now insert the time interpolated entry */
INSERT_ENTRY(lasttime + offset, interpolate(lastdepth, depth, offset, delta), sac);
/* skip events that happened at this time */
while (ev && ev->time.seconds == lasttime + offset)
ev = ev->next;
}
/* Add events if they are between plot entries */
while (ev && ev->time.seconds < time) {
INSERT_ENTRY(ev->time.seconds, interpolate(lastdepth, depth, ev->time.seconds - lasttime, delta), sac);
ev = ev->next;
}
entry->sec = time;
entry->depth = depth;
entry->running_sum = (entry - 1)->running_sum + (time - (entry - 1)->sec) * (depth + (entry - 1)->depth) / 2;
entry->stopdepth = sample->stopdepth.mm;
entry->stoptime = sample->stoptime.seconds;
entry->ndl = sample->ndl.seconds;
entry->tts = sample->tts.seconds;
pi->has_ndl |= sample->ndl.seconds;
entry->in_deco = sample->in_deco;
entry->cns = sample->cns;
if (dc->divemode == CCR) {
entry->o2pressure.mbar = entry->o2setpoint.mbar = sample->setpoint.mbar; // for rebreathers
entry->o2sensor[0].mbar = sample->o2sensor[0].mbar; // for up to three rebreather O2 sensors
entry->o2sensor[1].mbar = sample->o2sensor[1].mbar;
entry->o2sensor[2].mbar = sample->o2sensor[2].mbar;
} else {
entry->pressures.o2 = sample->setpoint.mbar / 1000.0;
}
/* FIXME! sensor index -> cylinder index translation! */
// entry->cylinderindex = sample->sensor;
SENSOR_PRESSURE(entry) = sample->cylinderpressure.mbar;
O2CYLINDER_PRESSURE(entry) = sample->o2cylinderpressure.mbar;
if (sample->temperature.mkelvin)
entry->temperature = lasttemp = sample->temperature.mkelvin;
else
entry->temperature = lasttemp;
entry->heartbeat = sample->heartbeat;
entry->bearing = sample->bearing.degrees;
entry->sac = sample->sac.mliter;
if (sample->rbt.seconds)
entry->rbt = sample->rbt.seconds;
/* skip events that happened at this time */
while (ev && ev->time.seconds == time)
ev = ev->next;
lasttime = time;
lastdepth = depth;
idx++;
if (time > maxtime)
break;
}
/* Add two final surface events */
plot_data[idx++].sec = lasttime + 1;
plot_data[idx++].sec = lasttime + 2;
pi->nr = idx;
return plot_data;
}
#undef INSERT_ENTRY
static void populate_cylinder_pressure_data(int idx, int start, int end, struct plot_info *pi, bool o2flag)
{
int i;
/* First: check that none of the entries has sensor pressure for this cylinder index */
for (i = 0; i < pi->nr; i++) {
struct plot_data *entry = pi->entry + i;
if (entry->cylinderindex != idx && !o2flag)
continue;
if (CYLINDER_PRESSURE(o2flag, entry))
return;
}
/* Then: populate the first entry with the beginning cylinder pressure */
for (i = 0; i < pi->nr; i++) {
struct plot_data *entry = pi->entry + i;
if (entry->cylinderindex != idx && !o2flag)
continue;
if (o2flag)
O2CYLINDER_PRESSURE(entry) = start;
else
SENSOR_PRESSURE(entry) = start;
break;
}
/* .. and the last entry with the ending cylinder pressure */
for (i = pi->nr; --i >= 0; /* nothing */) {
struct plot_data *entry = pi->entry + i;
if (entry->cylinderindex != idx && !o2flag)
continue;
if (o2flag)
O2CYLINDER_PRESSURE(entry) = end;
else
SENSOR_PRESSURE(entry) = end;
break;
}
}
static void calculate_sac(struct dive *dive, struct plot_info *pi)
{
int i = 0, last = 0;
struct plot_data *last_entry = NULL;
for (i = 0; i < pi->nr; i++) {
struct plot_data *entry = pi->entry + i;
if (entry->sac)
continue;
if (!last_entry || last_entry->cylinderindex != entry->cylinderindex) {
last = i;
last_entry = entry;
entry->sac = get_local_sac(entry, pi->entry + i + 1, dive);
} else {
int j;
entry->sac = 0;
for (j = last; j < i; j++)
entry->sac += get_local_sac(pi->entry + j, pi->entry + j + 1, dive);
entry->sac /= (i - last);
if (entry->sec - last_entry->sec >= SAC_WINDOW) {
last++;
last_entry = pi->entry + last;
}
}
}
}
static void populate_secondary_sensor_data(struct divecomputer *dc, struct plot_info *pi)
{
/* We should try to see if it has interesting pressure data here */
}
static void setup_gas_sensor_pressure(struct dive *dive, struct divecomputer *dc, struct plot_info *pi)
{
int i;
struct divecomputer *secondary;
/* First, populate the pressures with the manual cylinder data.. */
for (i = 0; i < MAX_CYLINDERS; i++) {
cylinder_t *cyl = dive->cylinder + i;
int start = cyl->start.mbar ?: cyl->sample_start.mbar;
int end = cyl->end.mbar ?: cyl->sample_end.mbar;
if (!start || !end)
continue;
populate_cylinder_pressure_data(i, start, end, pi, dive->cylinder[i].cylinder_use == OXYGEN);
}
/*
* Here, we should try to walk through all the dive computers,
* and try to see if they have sensor data different from the
* primary dive computer (dc).
*/
secondary = &dive->dc;
do {
if (secondary == dc)
continue;
populate_secondary_sensor_data(dc, pi);
} while ((secondary = secondary->next) != NULL);
}
/* calculate DECO STOP / TTS / NDL */
static void calculate_ndl_tts(struct plot_data *entry, struct dive *dive, double surface_pressure)
{
/* FIXME: This should be configurable */
/* ascent speed up to first deco stop */
const int ascent_s_per_step = 1;
const int ascent_mm_per_step = 200; /* 12 m/min */
/* ascent speed between deco stops */
const int ascent_s_per_deco_step = 1;
const int ascent_mm_per_deco_step = 16; /* 1 m/min */
/* how long time steps in deco calculations? */
const int time_stepsize = 60;
const int deco_stepsize = 3000;
/* at what depth is the current deco-step? */
int next_stop = ROUND_UP(deco_allowed_depth(tissue_tolerance_calc(dive, depth_to_bar(entry->depth, dive)),
surface_pressure, dive, 1), deco_stepsize);
int ascent_depth = entry->depth;
/* at what time should we give up and say that we got enuff NDL? */
const int max_ndl = 7200;
int cylinderindex = entry->cylinderindex;
/* If we don't have a ceiling yet, calculate ndl. Don't try to calculate
* a ndl for lower values than 3m it would take forever */
if (next_stop == 0) {
if (entry->depth < 3000) {
entry->ndl = max_ndl;
return;
}
/* stop if the ndl is above max_ndl seconds, and call it plenty of time */
while (entry->ndl_calc < max_ndl && deco_allowed_depth(tissue_tolerance_calc(dive, depth_to_bar(entry->depth, dive)), surface_pressure, dive, 1) <= 0) {
entry->ndl_calc += time_stepsize;
add_segment(depth_to_bar(entry->depth, dive),
&dive->cylinder[cylinderindex].gasmix, time_stepsize, entry->o2pressure.mbar, dive, prefs.bottomsac);
}
/* we don't need to calculate anything else */
return;
}
/* We are in deco */
entry->in_deco_calc = true;
/* Add segments for movement to stopdepth */
for (; ascent_depth > next_stop; ascent_depth -= ascent_mm_per_step, entry->tts_calc += ascent_s_per_step) {
add_segment(depth_to_bar(ascent_depth, dive),
&dive->cylinder[cylinderindex].gasmix, ascent_s_per_step, entry->o2pressure.mbar, dive, prefs.decosac);
next_stop = ROUND_UP(deco_allowed_depth(tissue_tolerance_calc(dive, depth_to_bar(ascent_depth, dive)), surface_pressure, dive, 1), deco_stepsize);
}
ascent_depth = next_stop;
/* And how long is the current deco-step? */
entry->stoptime_calc = 0;
entry->stopdepth_calc = next_stop;
next_stop -= deco_stepsize;
/* And how long is the total TTS */
while (next_stop >= 0) {
/* save the time for the first stop to show in the graph */
if (ascent_depth == entry->stopdepth_calc)
entry->stoptime_calc += time_stepsize;
entry->tts_calc += time_stepsize;
add_segment(depth_to_bar(ascent_depth, dive),
&dive->cylinder[cylinderindex].gasmix, time_stepsize, entry->o2pressure.mbar, dive, prefs.decosac);
if (deco_allowed_depth(tissue_tolerance_calc(dive, depth_to_bar(ascent_depth,dive)), surface_pressure, dive, 1) <= next_stop) {
/* move to the next stop and add the travel between stops */
for (; ascent_depth > next_stop; ascent_depth -= ascent_mm_per_deco_step, entry->tts_calc += ascent_s_per_deco_step)
add_segment(depth_to_bar(ascent_depth, dive),
&dive->cylinder[cylinderindex].gasmix, ascent_s_per_deco_step, entry->o2pressure.mbar, dive, prefs.decosac);
ascent_depth = next_stop;
next_stop -= deco_stepsize;
}
}
}
/* Let's try to do some deco calculations.
*/
void calculate_deco_information(struct dive *dive, struct divecomputer *dc, struct plot_info *pi, bool print_mode)
{
int i;
double surface_pressure = (dc->surface_pressure.mbar ? dc->surface_pressure.mbar : get_surface_pressure_in_mbar(dive, true)) / 1000.0;
int last_ndl_tts_calc_time = 0;
for (i = 1; i < pi->nr; i++) {
struct plot_data *entry = pi->entry + i;
int j, t0 = (entry - 1)->sec, t1 = entry->sec;
int time_stepsize = 20;
entry->ambpressure = depth_to_bar(entry->depth, dive);
entry->gfline = MAX((double)prefs.gflow, (entry->ambpressure - surface_pressure) / (gf_low_pressure_this_dive - surface_pressure) *
(prefs.gflow - prefs.gfhigh) +
prefs.gfhigh) *
(100.0 - AMB_PERCENTAGE) / 100.0 + AMB_PERCENTAGE;
if (t0 > t1) {
fprintf(stderr, "non-monotonous dive stamps %d %d\n", t0, t1);
int xchg = t1;
t1 = t0;
t0 = xchg;
}
if (t0 != t1 && t1 - t0 < time_stepsize)
time_stepsize = t1 - t0;
for (j = t0 + time_stepsize; j <= t1; j += time_stepsize) {
int depth = interpolate(entry[-1].depth, entry[0].depth, j - t0, t1 - t0);
add_segment(depth_to_bar(depth, dive),
&dive->cylinder[entry->cylinderindex].gasmix, time_stepsize, entry->o2pressure.mbar, dive, entry->sac);
if ((t1 - j < time_stepsize) && (j < t1))
time_stepsize = t1 - j;
}
if (t0 == t1)
entry->ceiling = (entry - 1)->ceiling;
else
entry->ceiling = deco_allowed_depth(tissue_tolerance_calc(dive, depth_to_bar(entry->depth, dive)), surface_pressure, dive, !prefs.calcceiling3m);
for (j = 0; j < 16; j++) {
double m_value = buehlmann_inertgas_a[j] + entry->ambpressure / buehlmann_inertgas_b[j];
entry->ceilings[j] = deco_allowed_depth(tolerated_by_tissue[j], surface_pressure, dive, 1);
entry->percentages[j] = tissue_inertgas_saturation[j] < entry->ambpressure ?
tissue_inertgas_saturation[j] / entry->ambpressure * AMB_PERCENTAGE :
AMB_PERCENTAGE + (tissue_inertgas_saturation[j] - entry->ambpressure) / (m_value - entry->ambpressure) * (100.0 - AMB_PERCENTAGE);
}
/* should we do more calculations?
* We don't for print-mode because this info doesn't show up there */
if (prefs.calcndltts && !print_mode) {
/* only calculate ndl/tts on every 30 seconds */
if ((entry->sec - last_ndl_tts_calc_time) < 30) {
struct plot_data *prev_entry = (entry - 1);
entry->stoptime_calc = prev_entry->stoptime_calc;
entry->stopdepth_calc = prev_entry->stopdepth_calc;
entry->tts_calc = prev_entry->tts_calc;
entry->ndl_calc = prev_entry->ndl_calc;
continue;
}
last_ndl_tts_calc_time = entry->sec;
/* We are going to mess up deco state, so store it for later restore */
char *cache_data = NULL;
cache_deco_state(&cache_data);
calculate_ndl_tts(entry, dive, surface_pressure);
/* Restore "real" deco state for next real time step */
restore_deco_state(cache_data);
free(cache_data);
}
}
#if DECO_CALC_DEBUG & 1
dump_tissues();
#endif
}
/* Function calculate_ccr_po2: This function takes information from one plot_data structure (i.e. one point on
* the dive profile), containing the oxygen sensor values of a CCR system and, for that plot_data structure,
* calculates the po2 value from the sensor data. Several rules are applied, depending on how many o2 sensors
* there are and the differences among the readings from these sensors.
*/
static int calculate_ccr_po2(struct plot_data *entry, struct divecomputer *dc)
{
int sump = 0, minp = 999999, maxp = -999999;
int diff_limit = 100; // The limit beyond which O2 sensor differences are considered significant (default = 100 mbar)
int i, np = 0;
for (i = 0; i < dc->no_o2sensors; i++)
if (entry->o2sensor[i].mbar) { // Valid reading
++np;
sump += entry->o2sensor[i].mbar;
minp = MIN(minp, entry->o2sensor[i].mbar);
maxp = MAX(maxp, entry->o2sensor[i].mbar);
}
switch (np) {
case 0: // Uhoh
return entry->o2pressure.mbar;
case 1: // Return what we have
return sump;
case 2: // Take the average
return sump / 2;
case 3: // Voting logic
if (2 * maxp - sump + minp < diff_limit) { // Upper difference acceptable...
if (2 * minp - sump + maxp) // ...and lower difference acceptable
return sump / 3;
else
return (sump - minp) / 2;
} else {
if (2 * minp - sump + maxp) // ...but lower difference acceptable
return (sump - maxp) / 2;
else
return sump / 3;
}
default: // This should not happen
assert(np <= 3);
return 0;
}
}
static void calculate_gas_information_new(struct dive *dive, struct plot_info *pi)
{
int i;
double amb_pressure;
for (i = 1; i < pi->nr; i++) {
int fn2, fhe;
struct plot_data *entry = pi->entry + i;
int cylinderindex = entry->cylinderindex;
amb_pressure = depth_to_bar(entry->depth, dive);
fill_pressures(&entry->pressures, amb_pressure, &dive->cylinder[cylinderindex].gasmix, entry->o2pressure.mbar / 1000.0, dive->dc.divemode);
fn2 = (int)(1000.0 * entry->pressures.n2 / amb_pressure);
fhe = (int)(1000.0 * entry->pressures.he / amb_pressure);
/* Calculate MOD, EAD, END and EADD based on partial pressures calculated before
* so there is no difference in calculating between OC and CC
* END takes O₂ + N₂ (air) into account ("Narcotic" for trimix dives)
* EAD just uses N₂ ("Air" for nitrox dives) */
pressure_t modpO2 = { .mbar = (int)(prefs.modpO2 * 1000) };
entry->mod = (double)gas_mod(&dive->cylinder[cylinderindex].gasmix, modpO2, dive, 1).mm;
entry->end = (entry->depth + 10000) * (1000 - fhe) / 1000.0 - 10000;
entry->ead = (entry->depth + 10000) * fn2 / (double)N2_IN_AIR - 10000;
entry->eadd = (entry->depth + 10000) *
(entry->pressures.o2 / amb_pressure * O2_DENSITY +
entry->pressures.n2 / amb_pressure * N2_DENSITY +
entry->pressures.he / amb_pressure * HE_DENSITY) /
(O2_IN_AIR * O2_DENSITY + N2_IN_AIR * N2_DENSITY) * 1000 - 10000;
if (entry->mod < 0)
entry->mod = 0;
if (entry->ead < 0)
entry->ead = 0;
if (entry->end < 0)
entry->end = 0;
if (entry->eadd < 0)
entry->eadd = 0;
}
}
void fill_o2_values(struct divecomputer *dc, struct plot_info *pi, struct dive *dive)
/* In the samples from each dive computer, there may be uninitialised oxygen
* sensor or setpoint values, e.g. when events were inserted into the dive log
* or if the dive computer does not report o2 values with every sample. But
* for drawing the profile a complete series of valid o2 pressure values is
* required. This function takes the oxygen sensor data and setpoint values
* from the structures of plotinfo and replaces the zero values with their