release: 1.5.29

[lilypond.git] / lily / paper-column.cc

diff --git a/lily/paper-column.cc b/lily/paper-column.cc
index e9cd3be70ecb18e31b3a6377a5f12798894515ff..7296041000ced4c25196c42e339e4ed63d30d300 100644 (file)
--- a/lily/paper-column.cc
+++ b/lily/paper-column.cc
@@ -3,14 +3,34 @@
 
   source file of the GNU LilyPond music typesetter
 
-  (c)  1997--2001 Han-Wen Nienhuys <hanwen@cs.uu.nl>
+  (c)  1997--2002 Han-Wen Nienhuys <hanwen@cs.uu.nl>
 */
+
 #include "moment.hh"
 #include "paper-column.hh"
 #include "paper-score.hh"
 #include "debug.hh"
 #include "axis-group-interface.hh"
 #include "spaceable-grob.hh"
+#include "molecule.hh"
+#include "text-item.hh"
+#include "lookup.hh"
+#include "font-interface.hh"
+
+
+/*
+  Paper_columns form the top-most item parent. (The Paper_columns X
+  parent is Line_of_score, which is a spanner.)
+
+  Paper_columns form the units for the spacing engine. They are
+  numbered, the first (leftmost) is column 0. Numbering happens before
+  line-breaking, and columns are not renumbered after line breaking.
+
+  Since many columns go unused, you should only use the rank field to
+  get ordering information.  Two adjacent columns may have
+  non-adjacent numbers.
+  
+ */
 
 void
 Paper_column::do_break_processing ()
@@ -59,18 +79,20 @@ Paper_column::when_mom (Grob*me)
     }
   return s;
 }
-  
+
 bool
-Paper_column::musical_b () const
+Paper_column::musical_b (Grob *me)
 {
-  SCM m = get_grob_property ("shortest-starter-duration");
+  SCM m = me->get_grob_property ("shortest-starter-duration");
   Moment s (0);
   if (unsmob_moment (m))
     {
       s = *unsmob_moment (m);
     }
   return s != Moment (0);
+  
 }
+  
 
 bool
 Paper_column::used_b (Grob*me)
@@ -79,3 +101,29 @@ Paper_column::used_b (Grob*me)
     || gh_pair_p (me->get_grob_property ("bounded-by-me"))
     ;
 }
+
+/*
+  Print a vertical line and  the rank number, to aid debugging.  
+ */
+
+MAKE_SCHEME_CALLBACK(Paper_column,brew_molecule,1);
+SCM
+Paper_column::brew_molecule (SCM p)
+{
+  Grob *me = unsmob_grob (p);
+
+  String r = to_str (Paper_column::rank_i (me));
+  SCM properties = Font_interface::font_alist_chain (me);
+  
+  Molecule t = Text_item::text2molecule (me, ly_str02scm (r.ch_C()),
+                                        properties);
+  t.align_to (X_AXIS, CENTER);
+  t.align_to (Y_AXIS, DOWN);
+  
+  Molecule l = Lookup::filledbox (Box (Interval (-0.01, 0.01),
+                                      Interval (-2, -1)));
+
+  t.add_molecule (l);
+  return t.smobbed_copy ();                                            
+}
+