+#include "translator.icc"
+
+/*
+ this engraver glues together stems, rests and note heads into a NoteColumn
+ grob.
+
+ It also generates spacing objects. Originally, we have tried to
+ have the spacing functionality at different levels.
+
+ - by simply using the sequence of Separation-item as
+ spacing-sequences (at staff level). Unfortunately, this fucks up if
+ there are different kinds of tuplets in different voices (8th and
+ 8ths triplets combined made the program believe there were 1/12 th
+ notes.).
+
+ Doing it in a separate engraver using timing info is generally
+ complicated (start/end time management), and fucks up if a voice
+ changes staff.
+
+ Now we do it from here again. This has the problem that voices can
+ appear and disappear at will, leaving lots of loose ends (the note
+ spacing engraver don't know where to connect the last note of the
+ voice on the right with), but we don't complain about those, and let
+ the default spacing do its work.
+*/
+
+class Rhythmic_column_engraver : public Engraver
+{
+ vector<Grob*> rheads_;
+ Grob *stem_;
+ Grob *note_column_;
+ Grob *dotcol_;
+
+ Grob *last_spacing_;
+ Grob *spacing_;
+
+ void add_spacing_item (Grob *);
+
+ TRANSLATOR_DECLARATIONS (Rhythmic_column_engraver);
+protected:
+
+ DECLARE_ACKNOWLEDGER (dot_column);
+ DECLARE_ACKNOWLEDGER (stem);
+ DECLARE_ACKNOWLEDGER (rhythmic_head);
+ void process_acknowledged ();
+ void stop_translation_timestep ();
+};
+
+Rhythmic_column_engraver::Rhythmic_column_engraver ()