2 timing-translator.cc -- implement Timing_translator
5 source file of the GNU LilyPond music typesetter
7 (c) 1997--2003 Han-Wen Nienhuys <hanwen@cs.uu.nl>
11 #include "timing-translator.hh"
13 #include "translator-group.hh"
14 #include "global-translator.hh"
15 #include "multi-measure-rest.hh"
19 Timing_translator::stop_translation_timestep ()
22 Global_translator *global =0;
26 global = dynamic_cast<Global_translator*> (t);
30 /* allbars == ! skipbars */
31 SCM sb = get_property ("skipBars");
32 bool allbars = !to_boolean (sb);
34 // urg: multi bar rests: should always process whole of first bar?
35 SCM tim = get_property ("timing");
36 bool timb = to_boolean (tim);
39 Moment barleft = (measure_length () - measure_position ());
40 Moment now = now_mom ();
42 if (barleft > Moment (0)
44 Hmm. We insert the bar moment every time we process a
45 moment. A waste of cpu?
48 global->add_moment_to_process (now + barleft);
53 Timing_translator::initialize ()
57 move this to engraver-init.ly?
60 daddy_trans_->set_property ("timing" , SCM_BOOL_T);
61 daddy_trans_->set_property ("currentBarNumber" , gh_int2scm (1));
63 daddy_trans_->set_property ("timeSignatureFraction",
64 gh_cons (gh_int2scm (4), gh_int2scm (4)));
65 daddy_trans_->set_property ("measurePosition", Moment (Rational (0)).smobbed_copy ());
66 daddy_trans_->set_property ("measureLength", Moment (Rational (1)).smobbed_copy ());
67 daddy_trans_->set_property ("beatLength", Moment (Rational (1,4)).smobbed_copy ());
71 Timing_translator::measure_length () const
73 SCM l = get_property ("measureLength");
74 if (unsmob_moment (l))
75 return unsmob_moment (l)->main_part_;
80 Timing_translator::Timing_translator ()
86 Timing_translator::measure_position () const
88 SCM sm = get_property ("measurePosition");
91 if (unsmob_moment (sm))
93 m = *unsmob_moment (sm);
94 while (m.main_part_ < Rational (0))
95 m.main_part_ += measure_length ();
102 Timing_translator::start_translation_timestep ()
104 Translator *t = this;
105 Global_translator *global =0;
108 t = t->daddy_trans_ ;
109 global = dynamic_cast<Global_translator*> (t);
113 Moment now = global->now_mom_;
114 Moment dt = now - global -> prev_mom_;
117 programming_error ("Moving backwards in time");
120 else if (dt.main_part_.is_infinity ())
122 programming_error ("Moving infinitely to future");
131 SCM s = get_property ("measurePosition");
132 if (unsmob_moment (s))
134 measposp = *unsmob_moment (s);
139 daddy_trans_->set_property ("measurePosition", measposp.smobbed_copy ());
144 SCM barn = get_property ("currentBarNumber");
146 if (gh_number_p (barn))
148 b = gh_scm2int (barn);
151 SCM cad = get_property ("timing");
152 bool c= to_boolean (cad);
154 Rational len = measure_length ();
155 while (c && measposp.main_part_ >= len)
157 measposp.main_part_ -= len;
161 daddy_trans_->set_property ("currentBarNumber", gh_int2scm (b));
162 daddy_trans_->set_property ("measurePosition", measposp.smobbed_copy ());
165 ENTER_DESCRIPTION(Timing_translator,"","","","","","");