2 collision-reg.cc -- implement Collision_engraver
4 source file of the GNU LilyPond music typesetter
6 (c) 1997--2004 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"
16 collect Note_column, and as soon as there are 2 or more, put them in
17 a collision object. */
18 class Collision_engraver : public Engraver
21 Link_array<Grob> note_columns_;
24 virtual void acknowledge_grob (Grob_info);
25 virtual void process_acknowledged_grobs ();
26 virtual void stop_translation_timestep ();
28 TRANSLATOR_DECLARATIONS(Collision_engraver);
33 Collision_engraver::process_acknowledged_grobs ()
35 if (col_ || note_columns_.size () < 2)
39 col_ = make_item ("NoteCollision");
40 announce_grob (col_, SCM_EOL);
43 for (int i=0; i< note_columns_.size (); i++)
44 Note_collision_interface::add_column (col_,note_columns_[i]);
48 Collision_engraver::acknowledge_grob (Grob_info i)
50 if (Note_column::has_interface (i.grob_))
52 /*should check Y axis? */
53 if (Note_column::has_rests (i.grob_) || i.grob_->get_parent (X_AXIS))
56 note_columns_.push (i.grob_);
61 Collision_engraver::stop_translation_timestep ()
68 note_columns_.clear ();
71 Collision_engraver::Collision_engraver ()
79 ENTER_DESCRIPTION(Collision_engraver,
81 /* creats*/ "NoteCollision",
83 /* acks */ "note-column-interface",