Merge branch 'freediving-tweaks' of git://github.com/mguentner/subsurface

Merge freediving tweaks (zoom in on short dives etc) from Maximilian
Güntner.

Trivial conflicts in display.h due to unrelated printing stuff just
happening to be added nearby.

* 'freediving-tweaks' of git://github.com/mguentner/subsurface:
  moved zoomed_plot to display.h
  plot the time with a fixed padding (leading zero)
  updated/corrected comment
  added "Zoom" button and improved scaling
  fixed indentation
  use increments that make sense for 600 seconds
  Plot shorter (apnea) dives with a reasonable scale

1 files changed, 40 insertions, 14 deletions

diff --git a/profile.c b/profile.c
index 6a159cca8..d4e88c02c 100644
--- a/profile.c
+++ b/profile.c
@@ -14,6 +14,7 @@
 #include "color.h"
 
 int selected_dive = 0;
+char zoomed_plot = 0;
 
 typedef enum { STABLE, SLOW, MODERATE, FAST, CRAZY } velocity_t;
 
@@ -180,22 +181,40 @@ static void dump_pi (struct plot_info *pi)
  * When showing dive profiles, we scale things to the
  * current dive. However, we don't scale past less than
  * 30 minutes or 90 ft, just so that small dives show
- * up as such.
- * we also need to add 180 seconds at the end so the min/max
+ * up as such unless zoom is enabled.
+ * We also need to add 180 seconds at the end so the min/max
  * plots correctly
  */
 static int get_maxtime(struct plot_info *pi)
 {
 	int seconds = pi->maxtime;
-	/* min 30 minutes, rounded up to 5 minutes, with at least 2.5 minutes to spare */
-	return MAX(30*60, ROUND_UP(seconds+150, 60*5));
+	if (zoomed_plot) {
+		/* Rounded up to one minute, with at least 2.5 minutes to
+		 * spare.
+		 * For dive times shorter than 10 minutes, we use seconds/4 to
+		 * calculate the space dynamically.
+		 * This is seamless since 600/4 = 150.
+		 */
+		if ( seconds < 600 )
+			return ROUND_UP(seconds+seconds/4, 60);
+		else
+			return ROUND_UP(seconds+150, 60);
+	} else {
+		/* min 30 minutes, rounded up to 5 minutes, with at least 2.5 minutes to spare */
+		return MAX(30*60, ROUND_UP(seconds+150, 60*5));
+	}
 }
 
 static int get_maxdepth(struct plot_info *pi)
 {
 	unsigned mm = pi->maxdepth;
-	/* Minimum 30m, rounded up to 10m, with at least 3m to spare */
-	return MAX(30000, ROUND_UP(mm+3000, 10000));
+	if (zoomed_plot) {
+		/* Rounded up to 10m, with at least 3m to spare */
+		return ROUND_UP(mm+3000, 10000);
+	} else {
+		/* Minimum 30m, rounded up to 10m, with at least 3m to spare */
+		return MAX(30000, ROUND_UP(mm+3000, 10000));
+	}
 }
 
 typedef struct {
@@ -443,20 +462,21 @@ static void plot_depth_profile(struct graphics_context *gc, struct plot_info *pi
 	int sec, depth;
 	struct plot_data *entry;
 	int maxtime, maxdepth, marker;
-	int increments[4] = { 5*60, 10*60, 15*60, 30*60 };
+	int increments[8] = { 10, 20, 30, 60, 5*60, 10*60, 15*60, 30*60 };
 
 	/* Get plot scaling limits */
 	maxtime = get_maxtime(pi);
 	maxdepth = get_maxdepth(pi);
 
-	/* 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.
+	/* Time markers: at most every 10 seconds, but no more than 12 markers.
+	 * We start out with 10 seconds and increment up to 30 minutes,
+	 * depending on the dive time.
 	 * 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)
+	while (maxtime / increments[i] > 12 && i < 8)
 		i++;
 	incr = increments[i];
 	while (maxtime / incr > 12)
@@ -473,11 +493,17 @@ static void plot_depth_profile(struct graphics_context *gc, struct plot_info *pi
 	}
 	cairo_stroke(cr);
 
-	/* now the text on every second time marker */
+	/* now the text on the time markers */
 	text_render_options_t tro = {10, TIME_TEXT, CENTER, TOP};
-	for (i = incr; i < maxtime; i += 2 * incr)
-		plot_text(gc, &tro, i, 1, "%d", i/60);
-
+	if (maxtime < 600) {
+		/* Be a bit more verbose with shorter dives */
+		for (i = incr; i < maxtime; i += incr)
+			plot_text(gc, &tro, i, 1, "%02d:%02d", i/60, i%60);
+	} else {
+		/* Only render the time on every second marker for normal dives */
+		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;
 	gc->topy = 0; gc->bottomy = maxdepth;