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>
10 #include "paper-column.hh"
11 #include "engraver.hh"
13 #include "note-spacing.hh"
14 #include "staff-spacing.hh"
15 #include "group-interface.hh"
26 Rhythmic_tuple (Grob_info i, Moment m)
31 static int time_compare (Rhythmic_tuple const &, Rhythmic_tuple const &);
35 Acknowledge rhythmic elements, for initializing spacing fields in
38 should be the last one of the toplevel context
40 class Spacing_engraver : public Engraver
42 PQueue<Rhythmic_tuple> playing_durations_;
43 Array<Rhythmic_tuple> now_durations_;
44 Array<Rhythmic_tuple> stopped_durations_;
48 TRANSLATOR_DECLARATIONS (Spacing_engraver);
50 virtual void acknowledge_grob (Grob_info);
51 virtual void start_translation_timestep ();
52 virtual void stop_translation_timestep ();
53 virtual void process_music ();
54 virtual void finalize ();
58 compare (Rhythmic_tuple const &a, Rhythmic_tuple const &b)
60 return Rhythmic_tuple::time_compare (a,b);
64 Rhythmic_tuple::time_compare (Rhythmic_tuple const &h1,
65 Rhythmic_tuple const &h2)
67 return (h1.end_ - h2.end_).main_part_.sign ();
70 Spacing_engraver::Spacing_engraver ()
76 Spacing_engraver::process_music ()
80 spacing_ = make_spanner ("SpacingSpanner", SCM_EOL);
81 spacing_->set_bound (LEFT, unsmob_grob (get_property ("currentCommandColumn")));
87 Spacing_engraver::finalize ()
91 Grob * p = unsmob_grob (get_property ("currentCommandColumn"));
93 spacing_->set_bound (RIGHT, p);
99 Spacing_engraver::acknowledge_grob (Grob_info i)
101 if (Note_spacing::has_interface (i.grob_) || Staff_spacing::has_interface (i.grob_))
103 Pointer_group_interface::add_grob (spacing_, ly_symbol2scm ("wishes"), i.grob_);
106 if (i.grob_->internal_has_interface (ly_symbol2scm ("lyric-syllable-interface"))
107 || i.grob_->internal_has_interface (ly_symbol2scm ("multi-measure-event")))
111 only pay attention to durations that are not grace notes.
113 if (!now_.grace_part_)
115 Music *r = i.music_cause ();
116 if (r && r->is_mus_type ("rhythmic-event"))
118 Moment len = r->get_length ();
119 Rhythmic_tuple t (i, now_mom () + len);
120 now_durations_.push (t);
126 Spacing_engraver::stop_translation_timestep ()
128 Moment shortest_playing;
129 shortest_playing.set_infinite (1);
130 for (int i = 0; i < playing_durations_.size (); i++)
132 Music * mus = playing_durations_[i].info_.music_cause ();
135 Moment m = mus->get_length ();
136 shortest_playing = shortest_playing <? m;
140 starter.set_infinite (1);
142 for (int i = 0; i < now_durations_.size (); i++)
144 Moment m = now_durations_[i].info_.music_cause ()->get_length ();
147 starter = starter <? m;
148 playing_durations_.insert (now_durations_[i]);
152 now_durations_.clear ();
154 shortest_playing = shortest_playing <? starter;
157 = dynamic_cast<Paper_column*> (unsmob_grob (get_property ("currentMusicalColumn")));
159 assert (starter.to_bool ());
160 SCM sh = shortest_playing.smobbed_copy ();
161 SCM st = starter.smobbed_copy ();
163 sc->set_property ("shortest-playing-duration", sh);
164 sc->set_property ("shortest-starter-duration", st);
168 Spacing_engraver::start_translation_timestep ()
171 stopped_durations_.clear ();
172 while (playing_durations_.size () && playing_durations_.front ().end_ < now_)
173 playing_durations_.delmin ();
174 while (playing_durations_.size () && playing_durations_.front ().end_ == now_)
175 stopped_durations_.push (playing_durations_.get ());
181 ADD_TRANSLATOR (Spacing_engraver,
182 /* descr */ "make a SpacingSpanner and do bookkeeping of shortest starting and playing notes ",
183 /* creats*/ "SpacingSpanner",
185 /* acks */ "grob-interface",