2 measure-grouping-engraver.cc -- implement Measure_grouping_engraver
4 source file of the GNU LilyPond music typesetter
6 (c) 2002 Han-Wen Nienhuys <hanwen@cs.uu.nl>
9 #include "score-engraver.hh"
12 #include "side-position-interface.hh"
14 class Measure_grouping_engraver : public Engraver
17 TRANSLATOR_DECLARATIONS(Measure_grouping_engraver);
21 Rational stop_grouping_mom_;
23 virtual void start_translation_timestep ();
24 virtual void finalize ();
25 virtual void acknowledge_grob (Grob_info);
29 Measure_grouping_engraver::finalize()
33 grouping_->set_bound (RIGHT,
34 unsmob_grob (get_property ("currentCommandColumn")));
35 typeset_grob (grouping_);
42 Measure_grouping_engraver::acknowledge_grob (Grob_info gi)
46 Side_position_interface::add_support (grouping_, gi.grob_);
51 Measure_grouping_engraver::start_translation_timestep ()
53 Moment now = now_mom();
54 if (grouping_ && now.main_part_ >= stop_grouping_mom_ && !now.grace_part_)
56 Side_position_interface::add_staff_support (grouping_);
57 grouping_->set_bound (RIGHT,
58 unsmob_grob (get_property ("currentMusicalColumn")));
59 typeset_grob (grouping_);
66 SCM grouping = get_property ("beatGrouping");
67 if (gh_pair_p (grouping))
69 Moment *measpos = unsmob_moment (get_property ("measurePosition"));
70 Rational mp = measpos->main_part_;
72 Moment * beatlen = unsmob_moment (get_property ("beatLength"));
73 Rational bl = beatlen->main_part_;
76 for (SCM s = grouping; gh_pair_p (s);
77 where += Rational (gh_scm2int (gh_car (s))) * bl,
81 int grouplen = gh_scm2int (gh_car(s));
86 programming_error ("Huh, last grouping not finished yet.");
90 grouping_ = new Spanner (get_property ("MeasureGrouping"));
91 grouping_->set_bound (LEFT, unsmob_grob (get_property ("currentMusicalColumn")));
92 announce_grob (grouping_, SCM_EOL);
95 stop_grouping_mom_ = now.main_part_ + Rational(grouplen - 1) * bl ;
96 top_engraver ()->add_moment_to_process (Moment (stop_grouping_mom_));
99 grouping_->set_grob_property ("type", ly_symbol2scm ("triangle"));
101 grouping_->set_grob_property ("type", ly_symbol2scm ("bracket"));
108 Measure_grouping_engraver::Measure_grouping_engraver()
113 ENTER_DESCRIPTION(Measure_grouping_engraver,
114 /* descr */ "Creates Measure_grouping objects using beatGrouping property",
115 /* creats*/ "MeasureGrouping",
117 /* acks */ "note-column-interface",
118 /* reads */ "beatGrouping beatLength measurePosition currentMusicalColumn",