diff options
Diffstat (limited to 'device.c')
| -rw-r--r-- | device.c | 38 |
1 files changed, 35 insertions, 3 deletions
@@ -12,10 +12,10 @@ * To do that, we generate a 6-point profile: * * (0, 0) - * (t0, max_d) * (t1, max_d) - * (t2, d) + * (t2, max_d) * (t3, d) + * (t4, d) * (max_t, 0) * * with the same ascent/descent rates between the @@ -80,6 +80,28 @@ static int fill_samples(struct sample *s, int max_d, int avg_d, int max_t, doubl return 1; } +/* we have no average depth; instead of making up a random average depth + * we should assume either a PADI recrangular profile (for short and/or + * shallow dives) or more reasonably a six point profile with a 3 minute + * safety stop at 5m */ +static void fill_samples_no_avg(struct sample *s, int max_d, int max_t, double slope) +{ + // shallow or short dives are just trapecoids based on the given slope + if (max_d < 10000 || max_t < 600) { + s[1].time.seconds = max_d / slope; s[1].depth.mm = max_d; + s[2].time.seconds = max_t - max_d / slope; s[2].depth.mm = max_d; + } else { + s[1].time.seconds = max_d / slope; + s[1].depth.mm = max_d; + s[2].time.seconds = max_t - max_d / slope - 180; + s[2].depth.mm = max_d; + s[3].time.seconds = max_t - 5000 / slope - 180; + s[3].depth.mm = 5000; + s[4].time.seconds = max_t - 5000 / slope; + s[4].depth.mm = 5000; + } +} + struct divecomputer* fake_dc(struct divecomputer* dc) { static struct sample fake[6]; @@ -105,7 +127,17 @@ struct divecomputer* fake_dc(struct divecomputer* dc) * a reasonable average, let's just make something * up. Note that 'avg_d == max_d' is _not_ a reasonable * average. - */ + * We explicitly treat avg_d == 0 differently */ + if (avg_d == 0) { + /* we try for a sane slope, but bow to the insanity of + * the user supplied data */ + fill_samples_no_avg(fake, max_d, max_t, MAX(2.0 * max_d / max_t, 5000.0 / 60)); + if(fake[3].time.seconds == 0) { // just a 4 point profile + fakedc.samples = 4; + fake[3].time.seconds = max_t; + } + return &fakedc; + } if (avg_d < max_d / 10 || avg_d >= max_d) { avg_d = (max_d+10000)/3; if (avg_d > max_d) |