Tissue saturation plot a la Sherwater Pretel

This adds a toolbox icon to turn on a tissue plot inspired by the bar
graph of the Sherwater Petrel,

It shows the inert gas partial pressures for individual compartments. If
they are below the ambient pressure (grey line) they are shown in units of
the ambient pressure, if they are above, the excess is shown as a
percentage of the allowed overpressure for plain Buehlmann. So it has the
same units as a gradient factor. Thus also the a gradient factor line (for
the current depth) is shown.

The different tissues get different colors, greener for the faster ones and bluer
for the slower ones.

Positioning and on/off icon action still need some tender loving care.

Signed-off-by: Robert C. Helling <helling@atdotde.de>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

1 files changed, 4 insertions, 0 deletions

diff --git a/deco.h b/deco.h
index aa6d299dd..08ff93422 100644
--- a/deco.h
+++ b/deco.h
@@ -7,6 +7,10 @@ extern "C" {
 
 extern double tolerated_by_tissue[];
 extern double buehlmann_N2_t_halflife[];
+extern double tissue_inertgas_saturation[16];
+extern double buehlmann_inertgas_a[16], buehlmann_inertgas_b[16];
+extern double gf_low_pressure_this_dive;
+
 
 #ifdef __cplusplus
 }