2 spacing-engraver.cc -- implement Spacing_engraver
4 source file of the GNU LilyPond music typesetter
6 (c) 1999--2001 Han-Wen Nienhuys <hanwen@cs.uu.nl>
10 #include "musical-request.hh"
11 #include "paper-column.hh"
13 #include "spacing-spanner.hh"
14 #include "engraver.hh"
16 #include "note-spacing.hh"
17 #include "staff-spacing.hh"
18 #include "group-interface.hh"
28 Rhythmic_tuple (Grob_info i, Moment m)
33 static int time_compare (Rhythmic_tuple const &, Rhythmic_tuple const &);
37 Acknowledge rhythmic elements, for initializing spacing fields in
40 should be the last one of the toplevel context
42 class Spacing_engraver : public Engraver
44 PQueue<Rhythmic_tuple> playing_durations_;
45 Array<Rhythmic_tuple> now_durations_;
46 Array<Rhythmic_tuple> stopped_durations_;
50 TRANSLATOR_DECLARATIONS(Spacing_engraver);
52 virtual void acknowledge_grob (Grob_info);
53 virtual void start_translation_timestep ();
54 virtual void stop_translation_timestep ();
55 virtual void initialize ();
56 virtual void finalize ();
60 compare (Rhythmic_tuple const &a, Rhythmic_tuple const &b)
62 return Rhythmic_tuple::time_compare (a,b);
66 Rhythmic_tuple::time_compare (Rhythmic_tuple const &h1,
67 Rhythmic_tuple const &h2)
69 return (h1.end_ - h2.end_).main_part_.sign ();
72 Spacing_engraver::Spacing_engraver ()
78 Spacing_engraver::initialize ()
80 spacing_p_ =new Spanner (get_property ("SpacingSpanner"));
81 Spacing_spanner::set_interface (spacing_p_);
82 spacing_p_->set_bound (LEFT, unsmob_grob (get_property ("currentCommandColumn")));
83 announce_grob (spacing_p_, 0);
87 Spacing_engraver::finalize ()
89 Grob * p = unsmob_grob (get_property ("currentCommandColumn"));
90 spacing_p_->set_bound (RIGHT, p);
91 typeset_grob (spacing_p_);
96 Spacing_engraver::acknowledge_grob (Grob_info i)
98 if (Note_spacing::has_interface (i.grob_l_) || Staff_spacing::has_interface (i.grob_l_))
100 Pointer_group_interface::add_grob (spacing_p_, ly_symbol2scm ("wishes"), i.grob_l_);
103 if (to_boolean (i.grob_l_->get_grob_property ("non-rhythmic")))
106 if (Rhythmic_req * r = dynamic_cast<Rhythmic_req*> (i.music_cause ()))
108 Rhythmic_tuple t (i, now_mom () + r->length_mom ());
109 now_durations_.push (t);
114 Spacing_engraver::stop_translation_timestep ()
116 Moment shortest_playing;
117 shortest_playing.set_infinite (1);
118 for (int i=0; i < playing_durations_.size (); i++)
120 Moment m = (playing_durations_[i].info_.music_cause ())->length_mom ();
123 shortest_playing = shortest_playing <? m;
128 inf.set_infinite (1);
130 for (int i=0; i < now_durations_.size (); i++)
132 Moment m = now_durations_[i].info_.music_cause ()->length_mom ();
134 starter = starter <? m;
136 playing_durations_.insert (now_durations_[i]);
138 now_durations_.clear ();
140 shortest_playing = shortest_playing <? starter;
143 = dynamic_cast<Paper_column*> (unsmob_grob (get_property ("currentMusicalColumn")));
145 SCM sh = shortest_playing.smobbed_copy ();
146 SCM st = starter.smobbed_copy ();
148 sc->set_grob_property ("shortest-playing-duration", sh);
149 sc->set_grob_property ("shortest-starter-duration", st);
153 Spacing_engraver::start_translation_timestep ()
155 Moment now = now_mom ();
156 stopped_durations_.clear ();
157 while (playing_durations_.size () && playing_durations_.front ().end_ < now)
158 playing_durations_.delmin ();
159 while (playing_durations_.size () && playing_durations_.front ().end_ == now)
160 stopped_durations_.push (playing_durations_.get ());
166 ENTER_DESCRIPTION(Spacing_engraver,
167 /* descr */ "make a SpacingSpanner and do bookkeeping of shortest starting and playing notes ",
168 /* creats*/ "SpacingSpanner",
169 /* acks */ "grob-interface",