From a06d93217f1eded198e39d971a9286539f82b5c5 Mon Sep 17 00:00:00 2001
From: Linus Torvalds <torvalds@linux-foundation.org>
Date: Tue, 6 Sep 2011 19:28:31 -0700
Subject: [PATCH] Start doing gas management using output units

Ok, it's an odd place to start, but this now shows the pressure curve
details and the air usage in the proper units.

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---
 main.c    |  2 ++
 profile.c | 49 ++++++++++++++++++++++++++++++++++++++++---------
 2 files changed, 42 insertions(+), 9 deletions(-)

diff --git a/main.c b/main.c
index 9ef4fa0..e516d38 100644
--- a/main.c
+++ b/main.c
@@ -205,11 +205,13 @@ static void quit(GtkWidget *w, gpointer data)
 static void imperial(GtkWidget *w, gpointer data)
 {
 	output_units = IMPERIAL_units;
+	repaint_dive();
 }
 
 static void metric(GtkWidget *w, gpointer data)
 {
 	output_units = SI_units;
+	repaint_dive();
 }
 
 static GtkActionEntry menu_items[] = {
diff --git a/profile.c b/profile.c
index 6ddc23a..5cd8888 100644
--- a/profile.c
+++ b/profile.c
@@ -217,7 +217,7 @@ static int get_cylinder_pressure_range(struct dive *dive, double *scalex, double
 				       pressure_t *startp, pressure_t *endp)
 {
 	int i;
-	int min, max, mbar;
+	int min, max;
 
 	*scalex = round_seconds_up(dive->duration.seconds);
 
@@ -227,6 +227,7 @@ static int get_cylinder_pressure_range(struct dive *dive, double *scalex, double
 		startp->mbar = endp->mbar = 0;
 
 	for (i = 0; i < dive->samples; i++) {
+		int mbar;
 		struct sample *sample = dive->sample + i;
 
 		/* FIXME! We only track cylinder 0 right now */
@@ -235,15 +236,15 @@ static int get_cylinder_pressure_range(struct dive *dive, double *scalex, double
 		mbar = sample->cylinderpressure.mbar;
 		if (!mbar)
 			continue;
-		if (mbar && startp && !startp->mbar)
-			startp->mbar = mbar;
 		if (mbar < min)
 			min = mbar;
 		if (mbar > max)
 			max = mbar;
 	}
+	if (startp)
+		startp->mbar = max;
 	if (endp)
-		endp->mbar = mbar;
+		endp->mbar = min;
 	if (!max)
 		return 0;
 	*scaley = max * 1.5;
@@ -311,6 +312,7 @@ static void plot_info(struct dive *dive, cairo_t *cr,
 {
 	text_render_options_t tro = {0.2, 1.0, 0.2, LEFT};
 	const double liters_per_cuft = 28.317;
+	const char *unit;
 	double airuse;
 
 	airuse = calculate_airuse(dive);
@@ -318,12 +320,20 @@ static void plot_info(struct dive *dive, cairo_t *cr,
 		return;
 
 	/* I really need to start addign some unit setting thing */
-	airuse /= liters_per_cuft;
-	plot_text(cr, &tro, maxx*0.8, maxy*0.8, "cuft: %4.2f", airuse);
+	switch (output_units.volume) {
+	case LITER:
+		unit = "l";
+		break;
+	case CUFT:
+		unit = "cuft";
+		airuse /= liters_per_cuft;
+		break;
+	}
+	plot_text(cr, &tro, maxx*0.8, maxy*0.8, "vol: %4.2f %s", airuse, unit);
 	if (dive->duration.seconds) {
 		double pressure = 1 + (dive->meandepth.mm / 10000.0);
 		double sac = airuse / pressure * 60 / dive->duration.seconds;
-		plot_text(cr, &tro, maxx*0.8, maxy*0.85, "SAC: %4.2f", sac);
+		plot_text(cr, &tro, maxx*0.8, maxy*0.85, "SAC: %4.2f %s/min", sac, unit);
 	}
 }
 
@@ -337,10 +347,31 @@ static void plot_cylinder_pressure_text(struct dive *dive, cairo_t *cr,
 
 	if (get_cylinder_pressure_range(dive, &scalex, &scaley,
 					&startp, &endp)) {
+		int start, end;
+		const char *unit = "bar";
+
+		switch (output_units.pressure) {
+		case PASCAL:
+			start = startp.mbar * 100;
+			end = startp.mbar * 100;
+			unit = "pascal";
+			break;
+		case BAR:
+			start = startp.mbar / 1000;
+			end = endp.mbar / 1000;
+			unit = "bar";
+			break;
+		case PSI:
+			start = startp.mbar / 68.95;
+			end = endp.mbar / 68.95;
+			unit = "psi";
+			break;
+		}
+
 		text_render_options_t tro = {0.2, 1.0, 0.2, LEFT};
-		plot_text(cr, &tro, SCALE(0, startp.mbar), "%3.0f bar", startp.mbar/1000.0);
+		plot_text(cr, &tro, SCALE(0, startp.mbar), "%d %s", start, unit);
 		plot_text(cr, &tro, SCALE(dive->duration.seconds, endp.mbar),
-			  "%3.0f bar", endp.mbar/1000.0);
+			  "%d %s", end, unit);
 	}
 }
 
-- 
2.43.0