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When interpolating tank pressures, don't devide by zero

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When an interpolated segment is on the surface we get no pressure time -
and try to divide by zero.

(plus a small whitespace issue that slipped throught the cracks earlier)

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
This commit is contained in:
Dirk Hohndel 2014-01-08 21:00:30 +08:00
parent eec5dba1c2
commit fef4d15965
1 changed files with 10 additions and 7 deletions
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17
profile.c
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@ -428,8 +428,8 @@ struct pr_interpolate_struct {
#ifdef DEBUG_PR_INTERPOLATE #ifdef DEBUG_PR_INTERPOLATE
static void dump_pr_interpolate(int i, pr_interpolate_t interpolate_pr) static void dump_pr_interpolate(int i, pr_interpolate_t interpolate_pr)
{ {
printf("Interpolate for entry %d: start %d - end %d - pt %d - acc_pt %d\n", i, printf("Interpolate for entry %d: start %d - end %d - pt %d - acc_pt %d\n", i,
interpolate_pr.start, interpolate_pr.end, interpolate_pr.pressure_time, interpolate_pr.acc_pressure_time); interpolate_pr.start, interpolate_pr.end, interpolate_pr.pressure_time, interpolate_pr.acc_pressure_time);
} }
#endif #endif
@ -620,12 +620,15 @@ static void fill_missing_tank_pressures(struct dive *dive, struct plot_info *pi,
#ifdef DEBUG_PR_INTERPOLATE #ifdef DEBUG_PR_INTERPOLATE
dump_pr_interpolate(i, interpolate); dump_pr_interpolate(i, interpolate);
#endif #endif
/* Overall pressure change over total pressure-time for this segment*/ /* if this segment had pressure time, set the interpolated pressure */
magic = (interpolate.end - interpolate.start) / (double) interpolate.pressure_time; if (interpolate.pressure_time) {
/* Overall pressure change over total pressure-time for this segment*/
magic = (interpolate.end - interpolate.start) / (double) interpolate.pressure_time;
/* Use that overall pressure change to update the current pressure */ /* Use that overall pressure change to update the current pressure */
cur_pr[cyl] = interpolate.start + magic * interpolate.acc_pressure_time + 0.5; cur_pr[cyl] = interpolate.start + magic * interpolate.acc_pressure_time + 0.5;
INTERPOLATED_PRESSURE(entry) = cur_pr[cyl]; INTERPOLATED_PRESSURE(entry) = cur_pr[cyl];
}
} }
} }