2 spacing-engraver.cc -- implement Spacing_engraver
4 source file of the GNU LilyPond music typesetter
6 (c) 1999--2004 Han-Wen Nienhuys <hanwen@cs.uu.nl>
11 #include "paper-column.hh"
12 #include "engraver.hh"
14 #include "note-spacing.hh"
15 #include "staff-spacing.hh"
16 #include "group-interface.hh"
27 Rhythmic_tuple (Grob_info i, Moment m)
32 static int time_compare (Rhythmic_tuple const &, Rhythmic_tuple const &);
36 Acknowledge rhythmic elements, for initializing spacing fields in
39 should be the last one of the toplevel context
41 class Spacing_engraver : public Engraver
43 PQueue<Rhythmic_tuple> playing_durations_;
44 Array<Rhythmic_tuple> now_durations_;
45 Array<Rhythmic_tuple> stopped_durations_;
49 TRANSLATOR_DECLARATIONS (Spacing_engraver);
51 virtual void acknowledge_grob (Grob_info);
52 virtual void start_translation_timestep ();
53 virtual void stop_translation_timestep ();
54 virtual void process_music ();
55 virtual void finalize ();
59 compare (Rhythmic_tuple const &a, Rhythmic_tuple const &b)
61 return Rhythmic_tuple::time_compare (a,b);
65 Rhythmic_tuple::time_compare (Rhythmic_tuple const &h1,
66 Rhythmic_tuple const &h2)
68 return (h1.end_ - h2.end_).main_part_.sign ();
71 Spacing_engraver::Spacing_engraver ()
77 Spacing_engraver::process_music ()
81 spacing_ = make_spanner ("SpacingSpanner", SCM_EOL);
82 spacing_->set_bound (LEFT, unsmob_grob (get_property ("currentCommandColumn")));
88 Spacing_engraver::finalize ()
92 Grob * p = unsmob_grob (get_property ("currentCommandColumn"));
94 spacing_->set_bound (RIGHT, p);
100 Spacing_engraver::acknowledge_grob (Grob_info i)
102 if (Note_spacing::has_interface (i.grob_) || Staff_spacing::has_interface (i.grob_))
104 Pointer_group_interface::add_grob (spacing_, ly_symbol2scm ("wishes"), i.grob_);
107 if (i.grob_->internal_has_interface (ly_symbol2scm ("lyric-syllable-interface"))
108 || i.grob_->internal_has_interface (ly_symbol2scm ("multi-measure-event")))
112 only pay attention to durations that are not grace notes.
114 if (!now_.grace_part_)
116 Music *r = i.music_cause ();
117 if (r && r->is_mus_type ("rhythmic-event"))
119 Moment len = r->get_length ();
120 Rhythmic_tuple t (i, now_mom () + len);
121 now_durations_.push (t);
127 Spacing_engraver::stop_translation_timestep ()
129 Moment shortest_playing;
130 shortest_playing.set_infinite (1);
131 for (int i=0; i < playing_durations_.size (); i++)
133 Music * mus = playing_durations_[i].info_.music_cause ();
136 Moment m = mus->get_length ();
137 shortest_playing = shortest_playing <? m;
141 starter.set_infinite (1);
143 for (int i=0; i < now_durations_.size (); i++)
145 Moment m = now_durations_[i].info_.music_cause ()->get_length ();
148 starter = starter <? m;
149 playing_durations_.insert (now_durations_[i]);
153 now_durations_.clear ();
155 shortest_playing = shortest_playing <? starter;
158 = dynamic_cast<Paper_column*> (unsmob_grob (get_property ("currentMusicalColumn")));
160 assert (starter.to_bool ());
161 SCM sh = shortest_playing.smobbed_copy ();
162 SCM st = starter.smobbed_copy ();
164 sc->set_property ("shortest-playing-duration", sh);
165 sc->set_property ("shortest-starter-duration", st);
169 Spacing_engraver::start_translation_timestep ()
172 stopped_durations_.clear ();
173 while (playing_durations_.size () && playing_durations_.front ().end_ < now_)
174 playing_durations_.delmin ();
175 while (playing_durations_.size () && playing_durations_.front ().end_ == now_)
176 stopped_durations_.push (playing_durations_.get ());
182 ENTER_DESCRIPTION (Spacing_engraver,
183 /* descr */ "make a SpacingSpanner and do bookkeeping of shortest starting and playing notes ",
184 /* creats*/ "SpacingSpanner",
186 /* acks */ "grob-interface",