Create tool-tip with depth/pressure for the whole profile area

This extends on our current tooltip logic (which shows events when you
mouse over them) to show tooltips for the whole profile area.

If you mouse over an event, that is still shown in the tooltip, but
even in the absense of events, the tooltip will be active, and mousing
over the profile area will show the time, depth and pressure.

This can certainly be improved upon further, but even in this form it is
useful.

Fixes #9

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

1 files changed, 41 insertions, 2 deletions

diff --git a/profile.c b/profile.c
index 065934746..c8ce440d6 100644
--- a/profile.c
+++ b/profile.c
@@ -900,6 +900,8 @@ static void plot_depth_profile(struct graphics_context *gc, struct plot_info *pi
 	maxtime = get_maxtime(pi);
 	maxdepth = get_maxdepth(pi);
 
+	gc->maxtime = maxtime;
+
 	/* 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.
@@ -1908,11 +1910,12 @@ static void plot_set_scale(scale_mode_t scale)
 	}
 }
 
-void plot(struct graphics_context *gc, cairo_rectangle_t *drawing_area, struct dive *dive, scale_mode_t scale)
+void plot(struct graphics_context *gc, struct dive *dive, scale_mode_t scale)
 {
 	struct plot_info *pi;
 	static struct sample fake[4];
 	struct sample *sample = dive->sample;
+	cairo_rectangle_t *drawing_area = &gc->drawing_area;
 	int nr = dive->samples;
 
 	plot_set_scale(scale);
@@ -1994,5 +1997,41 @@ void plot(struct graphics_context *gc, cairo_rectangle_t *drawing_area, struct d
 
 	plot_depth_scale(gc, pi);
 
-	free(pi);
+	if (gc->printer) {
+		free(pi);
+	} else {
+		free(gc->plot_info);
+		gc->plot_info = pi;
+	}
+}
+
+static void plot_string(struct plot_data *entry, char *buf, size_t bufsize)
+{
+	int depth_decimals, pressure;
+	const char *depth_unit, *pressure_unit;
+	double depth;
+
+	depth = get_depth_units(entry->depth, &depth_decimals, &depth_unit);
+	pressure = get_pressure_units(GET_PRESSURE(entry), &pressure_unit);
+
+	snprintf(buf, bufsize, "%.*f %s\n%d %s",
+		depth_decimals, depth, depth_unit,
+		pressure, pressure_unit);
+}
+
+void get_plot_details(struct graphics_context *gc, int time, char *buf, size_t bufsize)
+{
+	struct plot_info *pi = gc->plot_info;
+
+	*buf = 0;
+	if (pi) {
+		int i;
+		for (i = 0; i < pi->nr; i++) {
+			struct plot_data *entry = pi->entry + i;
+			if (entry->sec >= time) {
+				plot_string(entry, buf, bufsize);
+				break;
+			}
+		}
+	}
 }