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"
13 #include "international.hh"
16 #include "note-column.hh"
17 #include "paper-column.hh"
19 #include "rest-collision.hh"
20 #include "rhythmic-head.hh"
21 #include "stream-event.hh"
24 class Rest_collision_engraver : public Engraver
27 Grob *rest_collision_;
29 void process_acknowledged ();
30 void stop_translation_timestep ();
32 TRANSLATOR_DECLARATIONS (Rest_collision_engraver);
35 Rest_collision_engraver::Rest_collision_engraver ()
41 Rest_collision_engraver::process_acknowledged ()
45 Moment now = now_mom ();
47 for (SCM s = get_property ("busyGrobs"); scm_is_pair (s); s = scm_cdr (s))
49 Grob *g = unsmob_grob (scm_cdar (s));
50 Moment *m = unsmob_moment (scm_caar (s));
54 if (Rhythmic_head::has_interface (g) && (*m) > now)
56 Grob *column = g->get_parent (X_AXIS);
59 g->warning (_ ("rhythmic head is not part of a rhythmic column"));
63 // Only include rests that start now. Include notes that started any time.
64 Paper_column *paper_column = dynamic_cast<Item*> (column)->get_column ();
65 if (!Rest::has_interface (g) || !paper_column || Paper_column::when_mom (paper_column) == now)
67 columns.insert (column);
68 rest_count += Note_column::has_rests (column);
73 if (!rest_collision_ && rest_count && columns.size () > 1)
75 rest_collision_ = make_item ("RestCollision", SCM_EOL);
76 for (set<Grob*>::iterator i = columns.begin (); i != columns.end (); ++i)
77 Rest_collision::add_column (rest_collision_, *i);
82 Rest_collision_engraver::stop_translation_timestep ()
87 #include "translator.icc"
89 ADD_TRANSLATOR (Rest_collision_engraver,
91 "Handle collisions of rests.",