X-Git-Url: http://git.tdb.fi/?a=blobdiff_plain;f=profile.c;h=f10e856c29fb19e48cb1c757e31f290bf131fe17;hb=e88695ff72606d1556ff0e6e1423d3b6a5a1e9d8;hp=107f80bb554a39741991405cbf41088aeac68670;hpb=d4db3e938b16c67d20a40833323f64ca5d0024f2;p=ext%2Fsubsurface.git

diff --git a/profile.c b/profile.c
index 107f80b..f10e856 100644
--- a/profile.c
+++ b/profile.c
@@ -1,5 +1,6 @@
 #include <stdio.h>
 #include <stdlib.h>
+#include <stdarg.h>
 #include <time.h>
 
 #include "dive.h"
@@ -26,10 +27,117 @@ static int round_feet_up(int feet)
 	return MAX(90, ROUND_UP(feet+5, 15));
 }
 
+static void plot_text(cairo_t *cr, double x, double y, const char *fmt, ...)
+{
+	cairo_text_extents_t extents;
+	char buffer[80];
+	va_list args;
+
+	va_start(args, fmt);
+	vsnprintf(buffer, sizeof(buffer), fmt, args);
+	va_end(args);
+
+	cairo_text_extents(cr, buffer, &extents);
+
+	x -= extents.width/2 + extents.x_bearing;
+	y += extents.height * 1.2;
+
+	cairo_move_to(cr, x, y);
+	cairo_text_path(cr, buffer);
+	cairo_set_source_rgb(cr, 0, 0, 0);
+	cairo_stroke(cr);
+
+	cairo_move_to(cr, x, y);
+	cairo_set_source_rgb(cr, 1, 0, 0);
+	cairo_show_text(cr, buffer);
+}
+
+/*
+ * Find the next maximum point in a 10-minute window.
+ *
+ * We exit early if we hit "enough" of a depth reversal,
+ * which is roughly 10 feet.
+ */
+static int next_minmax(struct dive *dive, int index, int minmax)
+{
+	const int enough = 3000;
+	int timelimit, depthlimit, result;
+	struct sample *sample = dive->sample + index;
+
+	if (index >= dive->samples)
+		return 0;
+
+	timelimit = 24*60*60;
+	depthlimit = sample->depth.mm;
+	result = 0;
+
+	for (;;) {
+		int time, depth;
+
+		index++;
+		sample++;
+		if (index >= dive->samples)
+			break;
+		time = sample->time.seconds;
+		depth = sample->depth.mm;
+		if (time > timelimit)
+			break;
+
+		if (minmax) {
+			if (depth <= depthlimit) {
+				if (depthlimit - depth > enough)
+					break;
+				continue;
+			}
+		} else {
+			if (depth >= depthlimit) {
+				if (depth - depthlimit > enough)
+					break;
+				continue;
+			}
+		}
+
+		result = index;
+		depthlimit = depth;
+		/* Look up to ten minutes into the future */
+		timelimit = time + 600;
+	}
+	return result;
+}
+
 /* Scale to 0,0 -> maxx,maxy */
 #define SCALE(x,y) (x)*maxx/scalex+topx,(y)*maxy/scaley+topy
 
-static void plot_profile(struct dive *dive, cairo_t *cr,
+static void plot_depth_text(struct dive *dive, cairo_t *cr,
+	double topx, double topy, double maxx, double maxy)
+{
+	double scalex, scaley;
+	int maxtime, maxdepth;
+	int i;
+
+	/* Get plot scaling limits */
+	maxtime = round_seconds_up(dive->duration.seconds);
+	maxdepth = round_feet_up(to_feet(dive->maxdepth));
+
+	scalex = maxtime;
+	scaley = maxdepth;
+
+	cairo_set_font_size(cr, 14);
+	cairo_set_source_rgb(cr, 1, 0.2, 0.2);
+	i = 0;
+	while ((i = next_minmax(dive, i, 1)) != 0) {
+		struct sample *sample = dive->sample+i;
+		int sec = sample->time.seconds;
+		int depth = to_feet(sample->depth);
+
+		plot_text(cr, SCALE(sec, depth), "%d ft", depth);
+		i = next_minmax(dive, i, 0);
+		if (!i)
+			break;
+	}
+}
+
+static void plot_depth_profile(struct dive *dive, cairo_t *cr,
 	double topx, double topy, double maxx, double maxy)
 {
 	double scalex, scaley;
@@ -165,11 +273,14 @@ static void plot(cairo_t *cr, int w, int h, struct dive *dive)
 	maxx = (w - 2*topx);
 	maxy = (h - 2*topy);
 
+	/* Cylinder pressure plot */
+	plot_cylinder_pressure(dive, cr, topx, topy, maxx, maxy);
+
 	/* Depth profile */
-	plot_profile(dive, cr, topx, topy, maxx, maxy);
+	plot_depth_profile(dive, cr, topx, topy, maxx, maxy);
 
-	/* Cylinder pressure plot? */
-	plot_cylinder_pressure(dive, cr, topx, topy, maxx, maxy);
+	/* Text on top of all graphs.. */
+	plot_depth_text(dive, cr, topx, topy, maxx, maxy);
 
 	/* Bounding box last */
 	scalex = scaley = 1.0;