Add plotting of the deco ceiling

Plot a red-shaded area on top of the depth profile to indicate the deco
ceiling (i.e., the area into which it isn't save to ascend at this point
of the dive.

So far this is of very limited use as libdivecomputer doesn't give us the
necessary information to plot this. I have sent patches for the OSTC to
Jef, hoping that he will include them in an update. I don't know how many
other dive computers will make this data available - I still need to add
this to our native Uemis support.

This commit also fixes two cut and paste errors in the previous commit
6540be9bd924 "Process ceiling events and store ceiling data in plot_info".

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

1 files changed, 38 insertions, 4 deletions

diff --git a/profile.c b/profile.c
index a4d32a78e..c6ab46649 100644
--- a/profile.c
+++ b/profile.c
@@ -78,7 +78,8 @@ typedef enum {
 	/* Other colors */
 	TEXT_BACKGROUND, ALERT_BG, ALERT_FG, EVENTS, SAMPLE_DEEP, SAMPLE_SHALLOW,
 	SMOOTHED, MINUTE, TIME_GRID, TIME_TEXT, DEPTH_GRID, MEAN_DEPTH, DEPTH_TOP,
-	DEPTH_BOTTOM, TEMP_TEXT, TEMP_PLOT, SAC_DEFAULT, BOUNDING_BOX, PRESSURE_TEXT, BACKGROUND
+	DEPTH_BOTTOM, TEMP_TEXT, TEMP_PLOT, SAC_DEFAULT, BOUNDING_BOX, PRESSURE_TEXT, BACKGROUND,
+	CEILING_SHALLOW, CEILING_DEEP
 } color_indice_t;
 
 typedef struct {
@@ -130,6 +131,9 @@ static const color_t profile_color[] = {
 	[BOUNDING_BOX]    = {{WHITE1, BLACK1_LOW_TRANS}},
 	[PRESSURE_TEXT]   = {{KILLARNEY1, BLACK1_LOW_TRANS}},
 	[BACKGROUND]      = {{SPRINGWOOD1, BLACK1_LOW_TRANS}},
+	[CEILING_SHALLOW] = {{REDORANGE1_HIGH_TRANS, REDORANGE1_HIGH_TRANS}},
+	[CEILING_DEEP]    = {{RED1_MED_TRANS, RED1_MED_TRANS}},
+
 };
 
 #define plot_info_size(nr) (sizeof(struct plot_info) + (nr)*sizeof(struct plot_data))
@@ -839,6 +843,7 @@ static void plot_depth_profile(struct graphics_context *gc, struct plot_info *pi
 	struct plot_data *entry;
 	int maxtime, maxdepth, marker;
 	int increments[8] = { 10, 20, 30, 60, 5*60, 10*60, 15*60, 30*60 };
+	gboolean plotting = FALSE;
 
 	/* Get plot scaling limits */
 	maxtime = get_maxtime(pi);
@@ -948,6 +953,36 @@ static void plot_depth_profile(struct graphics_context *gc, struct plot_info *pi
 		line_to(gc, sec, depth);
 		cairo_stroke(cr);
 	}
+
+	/* now on top of this the ceiling plot */
+	entry = pi->entry;
+	pat = cairo_pattern_create_linear (0.0, 0.0,  0.0, 256.0 * plot_scale);
+	pattern_add_color_stop_rgba (gc, pat, 0.5, CEILING_DEEP);
+	pattern_add_color_stop_rgba (gc, pat, 0, CEILING_SHALLOW);
+	cairo_set_source(gc->cr, pat);
+	cairo_pattern_destroy(pat);
+	cairo_set_line_width_scaled(gc->cr, 2);
+	for (i = 0; i < pi->nr; i++, entry++) {
+		if (entry->ceiling > 0) {
+			if (!plotting) {
+				move_to(gc, entry->sec, 0);
+				plotting = TRUE;
+			}
+			line_to(gc, entry->sec, entry->ceiling);
+		} else {
+			if (plotting) {
+				line_to(gc, entry->sec, 0);
+				cairo_close_path(gc->cr);
+				cairo_fill(gc->cr);
+				plotting = FALSE;
+			}
+		}
+	}
+	if (plotting) {
+		line_to(gc, entry->sec, 0);
+		cairo_close_path(gc->cr);
+		cairo_fill(gc->cr);
+	}
 }
 
 static int setup_temperature_limits(struct graphics_context *gc, struct plot_info *pi)
@@ -1621,14 +1656,14 @@ static struct plot_info *create_plot_info(struct dive *dive, int nr_samples, str
 
 		entry = pi->entry + i + pi_idx;
 		while (ceil_ev && ceil_ev->time.seconds <= sample->time.seconds) {
-			struct event *next_ceil_ev = get_next_event(dive->events, "ceiling");
+			struct event *next_ceil_ev = get_next_event(ceil_ev->next, "ceiling");
 			if (!next_ceil_ev || next_ceil_ev->time.seconds > sample->time.seconds)
 				break;
 			ceil_ev = next_ceil_ev;
 		}
 		if (ceil_ev && ceil_ev->time.seconds <= sample->time.seconds) {
 			ceiling = ceil_ev->value;
-			ceil_ev = get_next_event(dive->events, "ceiling");
+			ceil_ev = get_next_event(ceil_ev->next, "ceiling");
 		}
 		while (ev && ev->time.seconds < sample->time.seconds) {
 			/* insert two fake plot info structures for the end of
@@ -1636,7 +1671,6 @@ static struct plot_info *create_plot_info(struct dive *dive, int nr_samples, str
 			if (ev->time.seconds == sample->time.seconds - 1) {
 				entry->sec = ev->time.seconds - 1;
 				(entry+1)->sec = ev->time.seconds;
-			} else {
 				entry->sec = ev->time.seconds;
 				(entry+1)->sec = ev->time.seconds + 1;
 			}