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--2001 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   8 */
   9
  10 #include "debug.hh"
  11 #include "timing-translator.hh"
  12 #include "command-request.hh"
  13 #include "translator-group.hh"
  14 #include "global-translator.hh"
  15 #include "multi-measure-rest.hh"
  16
  17 /*
  18   TODO: change the rest of lily, so communication with
  19   Timing_translator is only done through properties.  This means the
  20   class declaration can go here.  */
  21 bool
  22 Timing_translator::try_music (Music*r)
  23 {
  24   if (dynamic_cast<Barcheck_req*> (r))
  25     {
  26       check_ = r;
  27       return true;
  28     }
  29   return false;
  30 }
  31
  32 void
  33 Timing_translator::process_music ()
  34 {
  35   if (check_ && measure_position ().main_part_)
  36     {
  37       check_->origin ()->warning (_f ("barcheck failed at: %s",
  38                                       measure_position ().str ()));
  39       Moment zero;
  40
  41       if (!to_boolean (get_property ("barCheckNoSynchronize")))
  42         daddy_trans_l_->set_property ("measurePosition", zero.smobbed_copy ());
  43     }
  44 }
  45
  46 void
  47 Timing_translator::stop_translation_timestep ()
  48 {
  49   check_ = 0;
  50
  51   Translator *t = this;
  52   Global_translator *global_l =0;
  53   do
  54     {
  55       t = t->daddy_trans_l_ ;
  56       global_l = dynamic_cast<Global_translator*> (t);
  57     }
  58   while (!global_l);
  59
  60   /* allbars == ! skipbars */
  61   SCM sb = get_property ("skipBars");
  62   bool allbars = !to_boolean (sb);
  63
  64   // urg: multi bar rests: should always process whole of first bar?
  65   SCM tim = get_property ("timing");
  66   bool timb = to_boolean (tim);
  67   if (timb && allbars)
  68     {
  69       Moment barleft = (measure_length () - measure_position ());
  70       Moment now = now_mom ();
  71
  72       if (barleft > Moment (0)
  73           /*
  74             Hmm. We insert the bar moment every time we process a
  75             moment.  A waste of cpu?
  76            */
  77           && !now.grace_part_)
  78         global_l->add_moment_to_process (now + barleft);
  79     }
  80 }
  81
  82
  83 ADD_THIS_TRANSLATOR (Timing_translator);
  84
  85 void
  86 Timing_translator::initialize ()
  87 {
  88   daddy_trans_l_->set_property ("timing" , SCM_BOOL_T);
  89   daddy_trans_l_->set_property ("currentBarNumber" , gh_int2scm (1));
  90
  91   daddy_trans_l_->set_property ("timeSignatureFraction",
  92                                 gh_cons (gh_int2scm (4), gh_int2scm (4)));
  93   daddy_trans_l_->set_property ("measurePosition", Moment (Rational (0)).smobbed_copy ());
  94   daddy_trans_l_->set_property ("measureLength", Moment (Rational (1)).smobbed_copy ());
  95   daddy_trans_l_->set_property ("beatLength", Moment (Rational (1,4)).smobbed_copy ());
  96 }
  97
  98 Rational
  99 Timing_translator::measure_length () const
 100 {
 101   SCM l = get_property ("measureLength");
 102   if (unsmob_moment (l))
 103     return unsmob_moment (l)->main_part_;
 104   else
 105     return Rational (1);
 106 }
 107
 108 Timing_translator::Timing_translator ()
 109 {
 110
 111 }
 112
 113 Moment
 114 Timing_translator::measure_position () const
 115 {
 116   SCM sm = get_property ("measurePosition");
 117
 118   Moment m   =0;
 119   if (unsmob_moment (sm))
 120     {
 121       m = *unsmob_moment (sm);
 122       while (m.main_part_ < Rational (0))
 123         m.main_part_ += measure_length ();
 124     }
 125
 126   return m;
 127 }
 128
 129 void
 130 Timing_translator::start_translation_timestep ()
 131 {
 132   check_ = 0;
 133   Translator *t = this;
 134   Global_translator *global_l =0;
 135   do
 136     {
 137       t = t->daddy_trans_l_ ;
 138       global_l = dynamic_cast<Global_translator*> (t);
 139     }
 140   while (!global_l);
 141
 142   Moment now = global_l->now_mom_;
 143   Moment dt = now  - global_l -> prev_mom_;
 144   if (dt < Moment (0))
 145     {
 146       programming_error ("Moving backwards in time");
 147       dt = 0;
 148     }
 149
 150   if (!dt.to_bool ())
 151     return;
 152
 153   Moment measposp;
 154
 155   SCM s = get_property ("measurePosition");
 156   if (unsmob_moment (s))
 157     {
 158       measposp = *unsmob_moment (s);
 159     }
 160   else
 161     {
 162       measposp = now;
 163       daddy_trans_l_->set_property ("measurePosition", measposp.smobbed_copy ());
 164     }
 165
 166   measposp += dt;
 167
 168   SCM barn = get_property ("currentBarNumber");
 169   int b = 0;
 170   if (gh_number_p (barn))
 171     {
 172       b = gh_scm2int (barn);
 173     }
 174
 175   SCM cad = get_property ("timing");
 176   bool c= to_boolean (cad);
 177
 178   Rational len = measure_length ();
 179   while (c && measposp.main_part_ >= len)
 180     {
 181       measposp.main_part_ -= len;
 182       b ++;
 183     }
 184
 185   daddy_trans_l_->set_property ("currentBarNumber", gh_int2scm (b));
 186   daddy_trans_l_->set_property ("measurePosition", measposp.smobbed_copy ());
 187 }
 188