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
  22 bool
  23 Timing_translator::try_music (Music*r)
  24 {
  25   if (dynamic_cast<Barcheck_req*> (r))
  26     {
  27       check_ = r;
  28       return true;
  29     }
  30   return false;
  31 }
  32
  33 void
  34 Timing_translator::process_music ()
  35 {
  36   if (check_ && measure_position ())
  37     {
  38       check_->origin ()->warning (_f ("barcheck failed at: %s",
  39                                       measure_position ().str ()));
  40       Moment zero;
  41
  42       if (!to_boolean (get_property ("barCheckNoSynchronize")))
  43         daddy_trans_l_->set_property ("measurePosition", zero.smobbed_copy ());
  44     }
  45 }
  46
  47
  48 void
  49 Timing_translator::stop_translation_timestep ()
  50 {
  51   check_ = 0;
  52
  53   Translator *t = this;
  54   Global_translator *global_l =0;
  55   do
  56     {
  57       t = t->daddy_trans_l_ ;
  58       global_l = dynamic_cast<Global_translator*> (t);
  59     }
  60   while (!global_l);
  61
  62   /* allbars == ! skipbars */
  63   SCM sb = get_property ("skipBars");
  64   bool allbars = !to_boolean (sb);
  65
  66   // urg: multi bar rests: should always process whole of first bar?
  67   SCM tim = get_property ("timing");
  68   bool timb = to_boolean (tim);
  69   if (timb && allbars)
  70     {
  71       Moment barleft = (measure_length () - measure_position ());
  72
  73       if (barleft > Moment (0))
  74         global_l->add_moment_to_process (now_mom () + barleft);
  75     }
  76 }
  77
  78
  79 ADD_THIS_TRANSLATOR (Timing_translator);
  80
  81 void
  82 Timing_translator::initialize ()
  83 {
  84   Moment m;
  85   daddy_trans_l_->set_property ("timing" , SCM_BOOL_T);
  86   daddy_trans_l_->set_property ("currentBarNumber" , gh_int2scm (1));
  87   daddy_trans_l_->set_property ("measurePosition", m.smobbed_copy ());
  88   daddy_trans_l_->set_property ("timeSignatureFraction",
  89                                 gh_cons (gh_int2scm (4), gh_int2scm (4)));
  90
  91   daddy_trans_l_->set_property ("measureLength", Moment (1).smobbed_copy ());
  92   daddy_trans_l_->set_property ("beatLength", Moment (1,4).smobbed_copy ());
  93 }
  94
  95 Moment
  96 Timing_translator::measure_length () const
  97 {
  98   SCM l = get_property ("measureLength");
  99   if (unsmob_moment (l))
 100     return *unsmob_moment (l);
 101   else
 102     return Moment (1);
 103 }
 104
 105
 106
 107 Timing_translator::Timing_translator ()
 108 {
 109
 110
 111 }
 112
 113
 114 Moment
 115 Timing_translator::measure_position () const
 116 {
 117   SCM sm = get_property ("measurePosition");
 118
 119   Moment m   =0;
 120   if (unsmob_moment (sm))
 121     {
 122       m = *unsmob_moment (sm);
 123       while (m < Moment (0))
 124         m += measure_length ();
 125     }
 126
 127   return m;
 128 }
 129
 130 void
 131 Timing_translator::start_translation_timestep ()
 132 {
 133         check_ =00;
 134   Translator *t = this;
 135   Global_translator *global_l =0;
 136   do
 137     {
 138       t = t->daddy_trans_l_ ;
 139       global_l = dynamic_cast<Global_translator*> (t);
 140     }
 141   while (!global_l);
 142
 143   Moment dt = global_l->now_mom_  - 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)
 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       daddy_trans_l_->set_property ("measurePosition", measposp.smobbed_copy ());
 163     }
 164
 165   measposp += dt;
 166
 167   SCM barn = get_property ("currentBarNumber");
 168   int b = 0;
 169   if (gh_number_p (barn))
 170     {
 171       b = gh_scm2int (barn);
 172     }
 173
 174   SCM cad = get_property ("timing");
 175   bool c= to_boolean (cad);
 176
 177   Moment len = measure_length ();
 178   while (c && measposp >= len)
 179     {
 180       measposp -= len;
 181       b ++;
 182     }
 183
 184   daddy_trans_l_->set_property ("currentBarNumber", gh_int2scm (b));
 185   daddy_trans_l_->set_property ("measurePosition", measposp.smobbed_copy ());
 186 }
 187