First stab at plotting a pO2 graph

So far this is done unconditionally. This already starts some of the
infrastructure for other gases, but so far only O2 is handled.
We also need a pressure scale on the right to make this useful - or we
need to do peek / trough pressure prints like we do for temperature and
depth.

Finally, I think I want to move the plot further down, maybe make the
whole plot area taller if we are plotting partial gas pressures as well.

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

1 files changed, 6 insertions, 0 deletions

diff --git a/display-gtk.h b/display-gtk.h
index f4961b301..879a02b4c 100644
--- a/display-gtk.h
+++ b/display-gtk.h
@@ -21,6 +21,12 @@ typedef struct {
 	gboolean otu;
 } visible_cols_t;
 
+typedef struct {
+	gboolean po2;
+	gboolean pn2;
+	gboolean phe;
+} enabled_graphs_t;
+
 typedef enum {
 	PREF_BOOL,
 	PREF_STRING