2 timing-grav.cc -- implement Timing_engraver
4 source file of the GNU LilyPond music typesetter
6 (c) 1997--2002 Han-Wen Nienhuys <hanwen@cs.uu.nl>
8 #include "translator-group.hh"
9 #include "command-request.hh"
10 #include "grob-info.hh"
11 #include "multi-measure-rest.hh"
12 #include "timing-translator.hh"
13 #include "engraver.hh"
18 class Timing_engraver : public Timing_translator, public Engraver
22 Needed to know whether we're advancing in grace notes, or not.
26 virtual void start_translation_timestep ();
27 virtual void stop_translation_timestep ();
30 TRANSLATOR_DECLARATIONS(Timing_engraver);
34 Timing_engraver::Timing_engraver ()
36 last_moment_.main_part_ = Rational (-1);
42 Timing_engraver::start_translation_timestep ()
44 Timing_translator::start_translation_timestep ();
46 SCM nonauto = get_property ("barNonAuto");
47 Moment now = now_mom ();
48 SCM which = get_property ("whichBar");
51 Set the first bar of the score?
53 if (!gh_string_p (which))
55 = (now.main_part_ || now.main_part_ == last_moment_.main_part_)
56 ? SCM_EOL : ly_str02scm ("|");
58 if (!gh_string_p (which) && !to_boolean (nonauto))
60 SCM always = get_property ("barAlways");
61 Moment mp = measure_position ();
62 if ( (last_moment_.main_part_ != now.main_part_
64 || (to_boolean (always)))
66 /* should this work, or be junked? See input/bugs/no-bars.ly */
67 which = get_property ("defaultBarType");
71 daddy_trans_l_->set_property ("whichBar", which);
75 Timing_engraver::stop_translation_timestep ()
77 Timing_translator::stop_translation_timestep ();
78 daddy_trans_l_->set_property ("whichBar", SCM_EOL);
79 last_moment_ = now_mom ();
83 ENTER_DESCRIPTION(Timing_engraver,
84 /* descr */ " Responsible for synchronizing timing information from staves.
85 Normally in @code{Score}. In order to create polyrhythmic music,
86 this engraver should be removed from @code{Score} and placed in
90 /* reads */ "timeSignatureFraction barCheckNoSynchronize barNonAuto whichBar barAlways defaultBarType skipBars timing oneBeat measureLength measurePosition currentBarNumber",