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Fix missing pressure plot at start of the dive in some situations

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In some situations we could end up with no sample pressure and no
interpolated pressure at time = 0. This is now fixed.

Fix notes in test dive the exposed the issue.

Also change the code in create_plot_info to keep the number of samples and
the number of corresponding pi entries in separate variables. This avoids
future changes from breaking if they assume they can access
dive->sample[nr_samples - 1] (which is a reasonable assumption to make).

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
This commit is contained in:
Dirk Hohndel 2011-11-04 15:34:30 -07:00
parent 93d07f631a
commit 4b735521e2
2 changed files with 14 additions and 10 deletions
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2
dives/test8.xml
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@ -5,7 +5,7 @@
<temperature air='27.0 C' water='26.0 C' />
<location>8th test dive, with samples</location>
<notes>SAC should be 0.93 cuft/min or 26.2 l/min
Tank pressure plotted incorrectly (issues with first sample of first tank).
Tank pressure plotted correctly (linear approximation)
Descent light green
First Ascent red, second orange, third yellow, last green
</notes>

22
profile.c
View file

@ -660,8 +660,10 @@ static void plot_cylinder_pressure_text(struct graphics_context *gc, struct plot
if (!get_cylinder_pressure_range(gc, pi))
return;
/* only loop over the actual events from the dive computer */
for (i = 2; i < pi->nr; i++) {
/* only loop over the actual events from the dive computer
* plus the second synthetic event at the start (to make sure
* we get "time=0" right) */
for (i = 1; i < pi->nr; i++) {
entry = pi->entry + i;
if (!entry->same_cylinder) {
@ -889,8 +891,9 @@ static void fill_missing_tank_pressures(struct dive *dive, struct plot_info *pi,
cur_pr[cyl] = track_pr[cyl]->start;
}
/* The first two are "fillers" */
for (i = 2; i < pi->nr; i++) {
/* The first two are "fillers", but in case we don't have a sample
* at time 0 we need to process the second of them here */
for (i = 1; i < pi->nr; i++) {
entry = pi->entry + i;
if (SENSOR_PRESSURE(entry)) {
cur_pr[entry->cylinderindex] = SENSOR_PRESSURE(entry);
@ -929,7 +932,8 @@ static void fill_missing_tank_pressures(struct dive *dive, struct plot_info *pi,
INTERPOLATED_PRESSURE(entry) =
cur_pr[entry->cylinderindex] + cur_pt * magic;
cur_pr[entry->cylinderindex] = INTERPOLATED_PRESSURE(entry);
}
} else
INTERPOLATED_PRESSURE(entry) = cur_pr[entry->cylinderindex];
}
}
}
@ -1109,14 +1113,14 @@ static struct plot_info *create_plot_info(struct dive *dive, int nr_samples, str
entry = pi->entry + i + pi_idx;
ev = get_next_gaschange(ev->next);
}
nr_samples += pi_idx - 2;
nr = nr_samples + pi_idx - 2;
check_gas_change_events(dive, pi);
for (cyl = 0; cyl < MAX_CYLINDERS; cyl++) /* initialize the start pressures */
track_pr[cyl] = pr_track_alloc(dive->cylinder[cyl].start.mbar, -1);
current = track_pr[pi->entry[2].cylinderindex];
for (i = 0; i < nr_samples; i++) {
entry = pi->entry + i + 2;
for (i = 0; i < nr + 1; i++) {
entry = pi->entry + i + 1;
entry->same_cylinder = entry->cylinderindex == cylinderindex;
cylinderindex = entry->cylinderindex;
@ -1155,7 +1159,7 @@ static struct plot_info *create_plot_info(struct dive *dive, int nr_samples, str
}
}
/* Fill in the last two entries with empty values but valid times */
i = nr_samples + 2;
i = nr + 2;
pi->entry[i].sec = sec + 20;
pi->entry[i+1].sec = sec + 40;
/* the number of actual entries - we may have allocated more if there