lily/tuplet-engraver.cc

   1 /*
   2   plet-engraver.cc --  implement Tuplet_engraver
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 1998--2004 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   7
   8  */
   9
  10
  11
  12 #include "tuplet-bracket.hh"
  13 #include "note-column.hh"
  14 #include "time-scaled-music.hh"
  15 #include "beam.hh"
  16 #include "music-list.hh"
  17 #include "engraver.hh"
  18 #include "spanner.hh"
  19
  20 class Tuplet_engraver : public Engraver
  21 {
  22 public:
  23   TRANSLATOR_DECLARATIONS (Tuplet_engraver);
  24
  25 protected:
  26   Link_array<Music> time_scaled_musics_;
  27   /// when does the scaled music stop? Array order is synced with time_scaled_musics_
  28   Array<Rational> stop_moments_;
  29   /// when does the current spanner stop? Array order is synced with time_scaled_musics_
  30   Array<Rational> span_stop_moments_;
  31
  32   /// The spanners. Array order is synced with time_scaled_musics_
  33   Link_array<Spanner> started_spanners_;
  34
  35   virtual void acknowledge_grob (Grob_info);
  36   virtual bool try_music (Music*r);
  37   virtual void start_translation_timestep ();
  38   virtual void process_acknowledged_grobs ();
  39 };
  40
  41 bool
  42 Tuplet_engraver::try_music (Music *c)
  43 {
  44   if (c->is_mus_type ("time-scaled-music"))
  45     {
  46       Music *el = unsmob_music (c->get_property ("element"));
  47       if (el && !el->is_mus_type ("event-chord"))
  48         {
  49           time_scaled_musics_.push (c);
  50           Rational m = now_mom ().main_part_ + c->get_length ().main_part_;
  51           stop_moments_.push (m);
  52
  53           SCM s = get_property ("tupletSpannerDuration");
  54           if (unsmob_moment (s))
  55             m = m <? (now_mom () + *unsmob_moment (s)).main_part_;
  56
  57           span_stop_moments_.push (m);
  58         }
  59       return true;
  60     }
  61   return false;
  62 }
  63
  64 void
  65 Tuplet_engraver::process_acknowledged_grobs ()
  66 {
  67   for (int i= 0; i < time_scaled_musics_.size (); i++)
  68     {
  69       if (i < started_spanners_.size () && started_spanners_[i])
  70         continue;
  71
  72       Spanner* glep = make_spanner ("TupletBracket", time_scaled_musics_ [i]->self_scm ());
  73
  74       if (i >= started_spanners_.size ())
  75         started_spanners_.push (glep);
  76       else
  77         started_spanners_[i] = glep;
  78
  79
  80       SCM proc = get_property ("tupletNumberFormatFunction");
  81       if (ly_c_procedure_p (proc))
  82         {
  83           SCM t = scm_apply_0 (proc, scm_list_n (time_scaled_musics_[i]->self_scm (), SCM_UNDEFINED));
  84           glep->set_property ("text", t);
  85         }
  86
  87     }
  88 }
  89
  90 void
  91 Tuplet_engraver::acknowledge_grob (Grob_info i)
  92 {
  93   if (Note_column::has_interface (i.grob_))
  94     {
  95       for (int j =0; j < started_spanners_.size (); j++)
  96         if (started_spanners_[j])
  97           Tuplet_bracket::add_column (started_spanners_[j], dynamic_cast<Item*> (i.grob_));
  98     }
  99 }
 100
 101 void
 102 Tuplet_engraver::start_translation_timestep ()
 103 {
 104   Moment now = now_mom ();
 105
 106   Moment tsd;
 107   SCM s = get_property ("tupletSpannerDuration");
 108   if (unsmob_moment (s))
 109     tsd = unsmob_moment (s)->main_part_;
 110
 111   for (int i= started_spanners_.size (); i--;)
 112     {
 113       if (now.main_part_ >= span_stop_moments_[i])
 114         {
 115           if (Spanner *sp = started_spanners_[i])
 116             {
 117               if (!sp->get_bound (RIGHT))
 118                 sp->set_bound (RIGHT, sp->get_bound (LEFT));
 119
 120               started_spanners_[i] =0;
 121             }
 122
 123           if (tsd.to_bool ())
 124             span_stop_moments_[i] += tsd.main_part_;
 125         }
 126
 127       if (now.main_part_ >= stop_moments_[i])
 128         {
 129           started_spanners_.del (i);
 130           stop_moments_.del (i);
 131           span_stop_moments_.del (i);
 132           time_scaled_musics_.del (i);
 133         }
 134     }
 135 }
 136
 137 Tuplet_engraver::Tuplet_engraver ()
 138 {
 139 }
 140
 141 ENTER_DESCRIPTION (Tuplet_engraver,
 142 /* descr */       "Catch Time_scaled_music and generate appropriate bracket  ",
 143 /* creats*/       "TupletBracket",
 144 /* accepts */     "time-scaled-music",
 145 /* acks  */      "note-column-interface",
 146 /* reads */       "tupletNumberFormatFunction tupletSpannerDuration",
 147 /* write */       "");