2 timing-translator.cc -- implement Timing_translator
5 source file of the GNU LilyPond music typesetter
7 (c) 1997--2002 Han-Wen Nienhuys <hanwen@cs.uu.nl>
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"
20 Timing_translator::stop_translation_timestep ()
23 Global_translator *global_l =0;
26 t = t->daddy_trans_l_ ;
27 global_l = dynamic_cast<Global_translator*> (t);
31 /* allbars == ! skipbars */
32 SCM sb = get_property ("skipBars");
33 bool allbars = !to_boolean (sb);
35 // urg: multi bar rests: should always process whole of first bar?
36 SCM tim = get_property ("timing");
37 bool timb = to_boolean (tim);
40 Moment barleft = (measure_length () - measure_position ());
41 Moment now = now_mom ();
43 if (barleft > Moment (0)
45 Hmm. We insert the bar moment every time we process a
46 moment. A waste of cpu?
49 global_l->add_moment_to_process (now + barleft);
55 Timing_translator::initialize ()
57 daddy_trans_l_->set_property ("timing" , SCM_BOOL_T);
58 daddy_trans_l_->set_property ("currentBarNumber" , gh_int2scm (1));
60 daddy_trans_l_->set_property ("timeSignatureFraction",
61 gh_cons (gh_int2scm (4), gh_int2scm (4)));
62 daddy_trans_l_->set_property ("measurePosition", Moment (Rational (0)).smobbed_copy ());
63 daddy_trans_l_->set_property ("measureLength", Moment (Rational (1)).smobbed_copy ());
64 daddy_trans_l_->set_property ("beatLength", Moment (Rational (1,4)).smobbed_copy ());
68 Timing_translator::measure_length () const
70 SCM l = get_property ("measureLength");
71 if (unsmob_moment (l))
72 return unsmob_moment (l)->main_part_;
77 Timing_translator::Timing_translator ()
83 Timing_translator::measure_position () const
85 SCM sm = get_property ("measurePosition");
88 if (unsmob_moment (sm))
90 m = *unsmob_moment (sm);
91 while (m.main_part_ < Rational (0))
92 m.main_part_ += measure_length ();
99 Timing_translator::start_translation_timestep ()
101 Translator *t = this;
102 Global_translator *global_l =0;
105 t = t->daddy_trans_l_ ;
106 global_l = dynamic_cast<Global_translator*> (t);
110 Moment now = global_l->now_mom_;
111 Moment dt = now - global_l -> prev_mom_;
114 programming_error ("Moving backwards in time");
123 SCM s = get_property ("measurePosition");
124 if (unsmob_moment (s))
126 measposp = *unsmob_moment (s);
131 daddy_trans_l_->set_property ("measurePosition", measposp.smobbed_copy ());
136 SCM barn = get_property ("currentBarNumber");
138 if (gh_number_p (barn))
140 b = gh_scm2int (barn);
143 SCM cad = get_property ("timing");
144 bool c= to_boolean (cad);
146 Rational len = measure_length ();
147 while (c && measposp.main_part_ >= len)
149 measposp.main_part_ -= len;
153 daddy_trans_l_->set_property ("currentBarNumber", gh_int2scm (b));
154 daddy_trans_l_->set_property ("measurePosition", measposp.smobbed_copy ());
157 ENTER_DESCRIPTION (Timing_translator, "","","","","" );