2 rest-collision-engraver.cc -- implement Rest_collision_engraver
4 source file of the GNU LilyPond music typesetter
6 (c) 1997--2009 Han-Wen Nienhuys <hanwen@xs4all.nl>
11 #include "duration.hh"
12 #include "engraver.hh"
15 #include "note-column.hh"
16 #include "rest-collision.hh"
17 #include "stream-event.hh"
20 class Rest_collision_engraver : public Engraver
22 Item *rest_collision_;
24 list<pair<Grob*, Moment> > note_columns_;
26 DECLARE_ACKNOWLEDGER (note_column);
27 void process_acknowledged ();
28 void stop_translation_timestep ();
29 void start_translation_timestep ();
31 TRANSLATOR_DECLARATIONS (Rest_collision_engraver);
34 Rest_collision_engraver::Rest_collision_engraver ()
41 Rest_collision_engraver::process_acknowledged ()
44 || note_columns_.empty ()
46 || (note_columns_.size () == rest_count_
50 rest_collision_ = make_item ("RestCollision", SCM_EOL);
52 list<pair<Grob*, Moment> >::iterator i;
53 for (i = note_columns_.begin (); i != note_columns_.end (); i++)
54 Rest_collision::add_column (rest_collision_, i->first);
58 Rest_collision_engraver::acknowledge_note_column (Grob_info i)
60 Moment end = now_mom ();
61 if (Note_column::has_rests (i.grob ()))
65 // We only keep track of ending moments for columns with notes.
66 // It is safe to add a column with notes to multiple RestCollisions, but
67 // it might not be safe to add a column with rests to multiple RestCollisions.
68 Grob *stem = Note_column::get_stem (i.grob ());
69 Stream_event *ev = stem ? stem->event_cause () : 0;
70 Duration *dur_ptr = ev ? unsmob_duration (ev->get_property ("duration")) : 0;
74 end.grace_part_ += dur_ptr->get_length ();
76 end.main_part_ += dur_ptr->get_length ();
79 note_columns_.push_back (pair<Grob*, Moment> (i.grob (), end));
83 Rest_collision_engraver::stop_translation_timestep ()
90 Rest_collision_engraver::start_translation_timestep ()
92 list<pair<Grob*, Moment> >::iterator i = note_columns_.begin ();
93 while (i != note_columns_.end ())
95 if (i->second <= now_mom ())
96 i = note_columns_.erase (i);
102 #include "translator.icc"
104 ADD_ACKNOWLEDGER (Rest_collision_engraver, note_column);
105 ADD_TRANSLATOR (Rest_collision_engraver,
107 "Handle collisions of rests.",