2 collision-engraver.cc -- implement Collision_engraver
4 source file of the GNU LilyPond music typesetter
6 (c) 1997--2005 Han-Wen Nienhuys <hanwen@cs.uu.nl>
9 #include "note-column.hh"
10 #include "note-collision.hh"
12 #include "engraver.hh"
13 #include "axis-group-interface.hh"
15 class Collision_engraver : public Engraver
18 Link_array<Grob> note_columns_;
21 virtual void acknowledge_grob (Grob_info);
22 virtual void process_acknowledged_grobs ();
23 virtual void stop_translation_timestep ();
25 TRANSLATOR_DECLARATIONS (Collision_engraver);
29 Collision_engraver::process_acknowledged_grobs ()
31 if (col_ || note_columns_.size () < 2)
35 col_ = make_item ("NoteCollision", SCM_EOL);
38 for (int i = 0; i < note_columns_.size (); i++)
39 Note_collision_interface::add_column (col_, note_columns_[i]);
43 Collision_engraver::acknowledge_grob (Grob_info i)
45 if (Note_column::has_interface (i.grob_))
47 /*should check Y axis? */
48 if (Note_column::has_rests (i.grob_) || i.grob_->get_parent (X_AXIS))
51 note_columns_.push (i.grob_);
56 Collision_engraver::stop_translation_timestep ()
59 note_columns_.clear ();
62 Collision_engraver::Collision_engraver ()
67 ADD_TRANSLATOR (Collision_engraver,
68 /* descr */ "Collect NoteColumns, and as soon as there are two or more, put them in a NoteCollision object.",
69 /* creats*/ "NoteCollision",
71 /* acks */ "note-column-interface",