Start plotting something.

The first plotting method was removed from profile.c
to profilegraphics.cpp and some conversion ( almost 1 to 1 )
was made so that the code could work.

Since the code is big - this commit has just a part of it
working - it plots the grid. but already works for testing
the resizing of the window and Zooming ( unimplemented )

Signed-off-by: Tomaz Canabrava <tcanabrava@kde.org>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

profile.h

@@ -19,6 +19,21 @@ struct plot_info;
 void calculate_max_limits(struct dive *dive, struct divecomputer *dc, struct graphics_context *gc);
 struct plot_info *create_plot_info(struct dive *dive, struct divecomputer *dc, struct graphics_context *gc);
 
+/*
+ * When showing dive profiles, we scale things to the
+ * current dive. However, we don't scale past less than
+ * 30 minutes or 90 ft, just so that small dives show
+ * up as such unless zoom is enabled.
+ * We also need to add 180 seconds at the end so the min/max
+ * plots correctly
+ */
+int get_maxtime(struct plot_info *pi);
+
+/* get the maximum depth to which we want to plot
+ * take into account the additional verical space needed to plot
+ * partial pressure graphs */
+int get_maxdepth(struct plot_info *pi);
+
 #ifdef __cplusplus
 }
 #endif