lily/grace-position-performer.cc

   1 /*
   2   grace-position-performer.cc --  implement Grace_position_performer
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 1999--2000 Jan Nieuwenhuizen <janneke@gnu.org>
   7
   8  */
   9
  10 #include "performer.hh"
  11 #include "audio-item.hh"
  12 #include "global-translator.hh"
  13
  14 class Grace_position_performer : public Performer
  15 {
  16 public:
  17   Grace_position_performer ();
  18
  19 protected:
  20   Link_array<Audio_note> graces_;
  21   Link_array<Audio_note> notes_;
  22
  23   VIRTUAL_COPY_CONS (Translator);
  24   virtual void acknowledge_audio_element (Audio_element_info);
  25   virtual void create_audio_elements ();
  26   virtual void start_translation_timestep ();
  27   Global_translator* global_translator_l ();
  28 };
  29
  30 ADD_THIS_TRANSLATOR (Grace_position_performer);
  31
  32 Grace_position_performer::Grace_position_performer ()
  33 {
  34 }
  35
  36 void
  37 Grace_position_performer::acknowledge_audio_element (Audio_element_info i)
  38 {
  39   if (Audio_note * n = dynamic_cast <Audio_note*> (i.elem_l_))
  40     {
  41       if (i.elem_l_->grace_b_)
  42         graces_.push (n);
  43       else
  44         notes_.push (n);
  45     }
  46 }
  47
  48 void
  49 Grace_position_performer::create_audio_elements ()
  50 {
  51   if (graces_.size ())
  52     {
  53       // we're above grace-engraver-group, so we cannot tell
  54       // grace-iterator.  note-performer should add moments.
  55       //Global_translator* global_l = global_translator_l ();
  56       Moment delay_mom = Moment (1, 8);
  57       if (notes_.size ())
  58         {
  59           Moment shortest_mom = notes_[0]->length_mom_;
  60           for (int i=1; i < notes_.size (); i++)
  61             shortest_mom = shortest_mom <? notes_[i]->length_mom_;
  62
  63           Rational grace_fraction_rat (1, 2);
  64           SCM prop = get_property ("graceFraction");
  65           if (unsmob_moment (prop))
  66             grace_fraction_rat = *unsmob_moment (prop);
  67
  68           delay_mom = shortest_mom * grace_fraction_rat;
  69           for (int i=0; i < notes_.size (); i++)
  70             {
  71               Audio_note* n = notes_[i];
  72               n->length_mom_ -= delay_mom;
  73               n->delayed_mom_ = delay_mom;
  74               n->delayed_until_mom_ = now_mom () + delay_mom;
  75               //global_l->add_moment_to_process (n->delayed_until_mom_);
  76             }
  77           notes_.clear ();
  78         }
  79
  80       Moment grace_length_mom;
  81       for (int i=0; i < graces_.size (); i++)
  82         grace_length_mom += graces_[i]->length_mom_;
  83
  84       Rational grace_factor_rat = delay_mom / grace_length_mom;
  85
  86       for (int i=0; i < graces_.size (); i++)
  87         {
  88           Audio_note* n = graces_[i];
  89           n->length_mom_ *= grace_factor_rat;
  90           if (i)
  91             {
  92               Audio_note* p = graces_[i-1];
  93               n->delayed_mom_ = p->delayed_mom_ + p->length_mom_;
  94               n->delayed_until_mom_ = now_mom () + n->delayed_mom_;
  95               //global_l->add_moment_to_process (n->delayed_until_mom_);
  96             }
  97         }
  98       graces_.clear ();
  99     }
 100 }
 101
 102 Global_translator*
 103 Grace_position_performer::global_translator_l ()
 104 {
 105   Translator *t = this;
 106   Global_translator *global_l =0;
 107   do
 108     {
 109       t = t->daddy_trans_l_ ;
 110       global_l = dynamic_cast<Global_translator*> (t);
 111     }
 112   while (!global_l);
 113
 114   return global_l;
 115 }
 116
 117
 118 void
 119 Grace_position_performer::start_translation_timestep ()
 120 {
 121   graces_.clear ();
 122   notes_.clear ();
 123 }
 124