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 "paper-column.hh"
18 #include "rest-collision.hh"
19 #include "rhythmic-head.hh"
20 #include "stream-event.hh"
23 class Rest_collision_engraver : public Engraver
26 Grob *rest_collision_;
28 void process_acknowledged ();
29 void stop_translation_timestep ();
31 TRANSLATOR_DECLARATIONS (Rest_collision_engraver);
34 Rest_collision_engraver::Rest_collision_engraver ()
40 Rest_collision_engraver::process_acknowledged ()
44 Moment now = now_mom ();
46 for (SCM s = get_property ("busyGrobs"); scm_is_pair (s); s = scm_cdr (s))
48 Grob *g = unsmob_grob (scm_cdar (s));
49 Moment *m = unsmob_moment (scm_caar (s));
53 if (Rhythmic_head::has_interface (g) && (*m) > now)
55 Grob *column = g->get_parent (X_AXIS);
57 // Only include rests that start now. Include notes that started any time.
58 Paper_column *paper_column = dynamic_cast<Item*> (column)->get_column ();
59 if (!Rest::has_interface (g) || !paper_column || Paper_column::when_mom (paper_column) == now)
61 columns.insert (column);
62 rest_count += Note_column::has_rests (column);
67 if (!rest_collision_ && rest_count && columns.size () > 1)
69 rest_collision_ = make_item ("RestCollision", SCM_EOL);
70 for (set<Grob*>::iterator i = columns.begin (); i != columns.end (); ++i)
71 Rest_collision::add_column (rest_collision_, *i);
76 Rest_collision_engraver::stop_translation_timestep ()
81 #include "translator.icc"
83 ADD_TRANSLATOR (Rest_collision_engraver,
85 "Handle collisions of rests.",