2 collision-reg.cc -- implement Collision_engraver
4 source file of the GNU LilyPond music typesetter
6 (c) 1997--2002 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 {
20 Link_array<Grob> note_columns_;
23 virtual void acknowledge_grob (Grob_info);
24 virtual void process_acknowledged_grobs ();
25 virtual void stop_translation_timestep ();
27 TRANSLATOR_DECLARATIONS(Collision_engraver);
32 Collision_engraver::process_acknowledged_grobs ()
34 if (col_ || note_columns_.size () < 2)
38 col_ = new Item (get_property ("NoteCollision"));
39 announce_grob (col_, SCM_EOL);
42 for (int i=0; i< note_columns_.size (); i++)
43 Note_collision_interface::add_column (col_,note_columns_[i]);
47 Collision_engraver::acknowledge_grob (Grob_info i)
49 if (Note_column::has_interface (i.grob_))
51 /*should check Y axis? */
52 if (Note_column::rest_b (i.grob_) || i.grob_->get_parent (X_AXIS))
55 note_columns_.push (i.grob_);
60 Collision_engraver::stop_translation_timestep ()
67 note_columns_.clear ();
70 Collision_engraver::Collision_engraver ()
78 ENTER_DESCRIPTION(Collision_engraver,
80 /* creats*/ "NoteCollision",
81 /* acks */ "note-column-interface",