lily/timing-translator.cc

   1 /*
   2   timing-translator.cc -- implement Timing_translator
   3
   4
   5   source file of the GNU LilyPond music typesetter
   6
   7   (c)  1997--2003 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   8 */
   9
  10 #include "warn.hh"
  11 #include "timing-translator.hh"
  12
  13 #include "translator-group.hh"
  14 #include "global-translator.hh"
  15 #include "multi-measure-rest.hh"
  16
  17
  18 void
  19 Timing_translator::stop_translation_timestep ()
  20 {
  21   Translator *t = this;
  22   Global_translator *global =0;
  23   do
  24     {
  25       t = t->daddy_trans_ ;
  26       global = dynamic_cast<Global_translator*> (t);
  27     }
  28   while (!global);
  29
  30   /* allbars == ! skipbars */
  31   SCM sb = get_property ("skipBars");
  32   bool allbars = !to_boolean (sb);
  33
  34   // urg: multi bar rests: should always process whole of first bar?
  35   SCM tim = get_property ("timing");
  36   bool timb = to_boolean (tim);
  37   if (timb && allbars)
  38     {
  39       Moment barleft = (measure_length () - measure_position ());
  40       Moment now = now_mom ();
  41
  42       if (barleft > Moment (0)
  43           /*
  44             Hmm. We insert the bar moment every time we process a
  45             moment.  A waste of cpu?
  46            */
  47           && !now.grace_part_)
  48         global->add_moment_to_process (now + barleft);
  49     }
  50 }
  51
  52 void
  53 Timing_translator::initialize ()
  54 {
  55   daddy_trans_->set_property ("timing" , SCM_BOOL_T);
  56   daddy_trans_->set_property ("currentBarNumber" , gh_int2scm (1));
  57
  58   daddy_trans_->set_property ("timeSignatureFraction",
  59                                 gh_cons (gh_int2scm (4), gh_int2scm (4)));
  60   daddy_trans_->set_property ("measurePosition", Moment (Rational (0)).smobbed_copy ());
  61   daddy_trans_->set_property ("measureLength", Moment (Rational (1)).smobbed_copy ());
  62   daddy_trans_->set_property ("beatLength", Moment (Rational (1,4)).smobbed_copy ());
  63 }
  64
  65 Rational
  66 Timing_translator::measure_length () const
  67 {
  68   SCM l = get_property ("measureLength");
  69   if (unsmob_moment (l))
  70     return unsmob_moment (l)->main_part_;
  71   else
  72     return Rational (1);
  73 }
  74
  75 Timing_translator::Timing_translator ()
  76 {
  77
  78 }
  79
  80 Moment
  81 Timing_translator::measure_position () const
  82 {
  83   SCM sm = get_property ("measurePosition");
  84
  85   Moment m   =0;
  86   if (unsmob_moment (sm))
  87     {
  88       m = *unsmob_moment (sm);
  89       while (m.main_part_ < Rational (0))
  90         m.main_part_ += measure_length ();
  91     }
  92
  93   return m;
  94 }
  95
  96 void
  97 Timing_translator::start_translation_timestep ()
  98 {
  99   Translator *t = this;
 100   Global_translator *global =0;
 101   do
 102     {
 103       t = t->daddy_trans_ ;
 104       global = dynamic_cast<Global_translator*> (t);
 105     }
 106   while (!global);
 107
 108   Moment now = global->now_mom_;
 109   Moment dt = now  - global -> prev_mom_;
 110   if (dt < Moment (0))
 111     {
 112       programming_error ("Moving backwards in time");
 113       dt = 0;
 114     }
 115
 116   if (!dt.to_bool ())
 117     return;
 118
 119   Moment measposp;
 120
 121   SCM s = get_property ("measurePosition");
 122   if (unsmob_moment (s))
 123     {
 124       measposp = *unsmob_moment (s);
 125     }
 126   else
 127     {
 128       measposp = now;
 129       daddy_trans_->set_property ("measurePosition", measposp.smobbed_copy ());
 130     }
 131
 132   measposp += dt;
 133
 134   SCM barn = get_property ("currentBarNumber");
 135   int b = 0;
 136   if (gh_number_p (barn))
 137     {
 138       b = gh_scm2int (barn);
 139     }
 140
 141   SCM cad = get_property ("timing");
 142   bool c= to_boolean (cad);
 143
 144   Rational len = measure_length ();
 145   while (c && measposp.main_part_ >= len)
 146     {
 147       measposp.main_part_ -= len;
 148       b ++;
 149     }
 150
 151   daddy_trans_->set_property ("currentBarNumber", gh_int2scm (b));
 152   daddy_trans_->set_property ("measurePosition", measposp.smobbed_copy ());
 153 }
 154
 155 ENTER_DESCRIPTION(Timing_translator,"","","","","","");