Merge branch 'ui' of git://github.com/dirkhh/subsurface

* 'ui' of git://github.com/dirkhh/subsurface:
  Disable sorting by dive number
  Fix oversight in preference implementation
  Make columns for temperature, cylinder, and nitrox optional
  Show dive number in dive list
  Improve time marker handling and add printing of some time labels

1 files changed, 23 insertions, 3 deletions

diff --git a/profile.c b/profile.c
index 78643cd75..5dad475bc 100644
--- a/profile.c
+++ b/profile.c
@@ -299,23 +299,43 @@ static void plot_minmax_profile(struct graphics_context *gc, struct plot_info *p
 
 static void plot_depth_profile(struct graphics_context *gc, struct plot_info *pi)
 {
-	int i;
+	int i, incr;
 	cairo_t *cr = gc->cr;
 	int sec, depth;
 	struct plot_data *entry;
 	int maxtime, maxdepth, marker;
+	int increments[4] = { 5*60, 10*60, 15*60, 30*60 };
 
 	/* Get plot scaling limits */
 	maxtime = get_maxtime(pi);
 	maxdepth = get_maxdepth(pi);
 
-	/* Time markers: every 5 min */
+	/* Time markers: at most every 5 min, but no more than 12 markers
+	 * and for convenience we do 5, 10, 15 or 30 min intervals.
+	 * This allows for 6h dives - enough (I hope) for even the craziest
+	 * divers - but just in case, for those 8h depth-record-breaking dives,
+	 * we double the interval if this still doesn't get us to 12 or fewer
+	 * time markers */
+	i = 0;
+	while (maxtime / increments[i] > 12 && i < 4)
+		i++;
+	incr = increments[i];
+	while (maxtime / incr > 12)
+		incr *= 2;
+
 	gc->leftx = 0; gc->rightx = maxtime;
 	gc->topy = 0; gc->bottomy = 1.0;
-	for (i = 5*60; i < maxtime; i += 5*60) {
+	set_source_rgba(gc, 1, 1, 1, 0.5);
+	for (i = incr; i < maxtime; i += incr) {
 		move_to(gc, i, 0);
 		line_to(gc, i, 1);
 	}
+	cairo_stroke(cr);
+
+	/* now the text on every second time marker */
+	text_render_options_t tro = {10, 0.2, 1.0, 0.2, CENTER, TOP};
+	for (i = incr; i < maxtime; i += 2 * incr)
+		plot_text(gc, &tro, i, 1, "%d", i/60);
 
 	/* Depth markers: every 30 ft or 10 m*/
 	gc->leftx = 0; gc->rightx = 1.0;