Add option to make ceiling visually stand out more in the profile

While having the background "come down" seemed like a good visualization
of the ceiling, some divers appear to prefer something more dramatic. This
adds an option to the Tec Settings to have the ceiling shown in red
instead of the default background color.

Suggested-by: Jan Schubert <Jan.Schubert@GMX.li>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

1 files changed, 25 insertions, 0 deletions

diff --git a/profile.c b/profile.c
index cea974b21..8940817b8 100644
--- a/profile.c
+++ b/profile.c
@@ -1007,6 +1007,31 @@ static void plot_depth_profile(struct graphics_context *gc, struct plot_info *pi
 	cairo_close_path(gc->cr);
 	cairo_fill(gc->cr);
 
+	/* if the user wants the deco ceiling more visible, do that here (this
+	 * basically draws over the background that we had allowed to shine
+	 * through so far) */
+	if (profile_red_ceiling) {
+		pat = cairo_pattern_create_linear (0.0, 0.0,  0.0, 256.0 * plot_scale);
+		pattern_add_color_stop_rgba (gc, pat, 0, CEILING_SHALLOW);
+		pattern_add_color_stop_rgba (gc, pat, 1, CEILING_DEEP);
+		cairo_set_source(gc->cr, pat);
+		cairo_pattern_destroy(pat);
+		entry = pi->entry;
+		move_to(gc, 0, 0);
+		for (i = 0; i < pi->nr; i++, entry++) {
+			if (entry->ndl == 0 && entry->stopdepth) {
+				if (entry->ndl == 0 && entry->stopdepth < entry->depth) {
+					line_to(gc, entry->sec, entry->stopdepth);
+				} else {
+					line_to(gc, entry->sec, entry->depth);
+				}
+			} else {
+				line_to(gc, entry->sec, 0);
+			}
+		}
+		cairo_close_path(gc->cr);
+		cairo_fill(gc->cr);
+	}
 	/* next show where we have been bad and crossed the ceiling */
 	pat = cairo_pattern_create_linear (0.0, 0.0,  0.0, 256.0 * plot_scale);
 	pattern_add_color_stop_rgba (gc, pat, 0, CEILING_SHALLOW);