X-Git-Url: http://git.tdb.fi/?a=blobdiff_plain;f=profile.c;h=6a159cca85681fcc8436f159e6d0da9deb56e7c4;hb=9380f78c82287deedc56ae831142801a3c4e9d42;hp=137ed6f88778c2dea942c2dd377b43dea11497d2;hpb=81fddfa67e779c8d378eee4c57fd9f201e15f96f;p=ext%2Fsubsurface.git

diff --git a/profile.c b/profile.c
index 137ed6f..6a159cc 100644
--- a/profile.c
+++ b/profile.c
@@ -1,5 +1,5 @@
 /* profile.c */
-/* creates all the necessary data for drawing the dive profile 
+/* creates all the necessary data for drawing the dive profile
  * uses cairo to draw it
  */
 #include <stdio.h>
@@ -873,7 +873,7 @@ static velocity_t velocity(int speed)
 	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 
+				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 */
@@ -929,7 +929,7 @@ static struct plot_info *analyze_plot_info(struct plot_info *pi)
 				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->velocity = velocity((entry[0].depth - entry[past].depth) /
 							(entry[0].sec - entry[past].sec));
 			}
 		} else
@@ -941,7 +941,7 @@ static struct plot_info *analyze_plot_info(struct plot_info *pi)
 		struct plot_data *entry = pi->entry +i;
 		analyze_plot_info_minmax(entry, pi->entry, pi->entry+nr);
 	}
-	
+
 	return pi;
 }
 
@@ -1048,16 +1048,18 @@ static void fill_missing_tank_pressures(struct plot_info *pi, pr_track_t **track
 				/* there may be multiple segments - so
 				 * let's assemble the length */
 				nlist = list;
-				pt = list->pressure_time;
-				while (!nlist->end) {
-					nlist = nlist->next;
-					if (!nlist) {
-						/* oops - we have no end pressure,
-						 * so this means this is a tank without
-						 * gas consumption information */
-						break;
+				if (list) {
+					pt = list->pressure_time;
+					while (!nlist->end) {
+						nlist = nlist->next;
+						if (!nlist) {
+							/* oops - we have no end pressure,
+							 * so this means this is a tank without
+							 * gas consumption information */
+							break;
+						}
+						pt += nlist->pressure_time;
 					}
-					pt += nlist->pressure_time;
 				}
 				if (!nlist) {
 					/* just continue without calculating
@@ -1354,12 +1356,15 @@ void plot(struct graphics_context *gc, cairo_rectangle_int_t *drawing_area, stru
 	int nr = dive->samples;
 
 	if (!nr) {
+		/* The dive has no samples, so create a few fake ones.  This assumes an
+		ascent/descent rate of 9 m/min, which is just below the limit for FAST. */
 		int duration = dive->duration.seconds;
 		int maxdepth = dive->maxdepth.mm;
+		int asc_desc_time = dive->maxdepth.mm*60/9000;
 		sample = fake;
-		fake[1].time.seconds = duration * 0.05;
+		fake[1].time.seconds = asc_desc_time;
 		fake[1].depth.mm = maxdepth;
-		fake[2].time.seconds = duration * 0.95;
+		fake[2].time.seconds = duration - asc_desc_time;
 		fake[2].depth.mm = maxdepth;
 		fake[3].time.seconds = duration * 1.00;
 		nr = 4;