2 time-scaled-music-iterator.cc -- implement Time_scaled_music_iterator
4 source file of the GNU LilyPond music typesetter
6 (c) 1998--2006 Han-Wen Nienhuys <hanwen@xs4all.nl>,
7 Erik Sandberg <mandolaerik@gmail.com>
12 #include "international.hh"
14 #include "sequential-iterator.hh"
17 Iterates \times, by sending TupletEvents at the start/end of each
18 tuplet bracket. Extra stop/start events are sent at regular
19 intervals if tupletSpannerDuration is set.
21 class Time_scaled_music_iterator : public Sequential_iterator
24 DECLARE_SCHEME_CALLBACK (constructor, ());
26 DECLARE_CLASSNAME(Time_scaled_music_iterator);
27 Time_scaled_music_iterator ();
29 virtual SCM get_music_list () const;
30 virtual void process (Moment m);
31 virtual void construct_children ();
32 virtual void derived_mark () const;
33 virtual Moment pending_moment () const;
35 /* tupletSpannerDuration */
36 Moment spanner_duration_;
37 /* next time to add a stop/start pair */
38 Moment next_split_mom_;
39 /* Recycle start/stop events if tupletSpannerDuration is set. */
44 Time_scaled_music_iterator::Time_scaled_music_iterator ()
46 spanner_duration_ = next_split_mom_ = 0;
51 Time_scaled_music_iterator::pending_moment () const
53 Moment next_mom = Sequential_iterator::pending_moment ();
55 if (spanner_duration_.to_bool () &&
56 next_mom.main_part_ > next_split_mom_)
58 next_mom = next_split_mom_;
66 Time_scaled_music_iterator::process (Moment m)
68 if (spanner_duration_.to_bool () &&
69 m.main_part_ == next_split_mom_)
72 report_event (start_);
73 next_split_mom_ += spanner_duration_;
74 /* avoid sending events twice at the end */
75 if (next_split_mom_ == get_music ()->get_length ().main_part_)
76 next_split_mom_.set_infinite (1);
78 Sequential_iterator::process(m);
82 Time_scaled_music_iterator::construct_children ()
86 Time_scaled_music_iterator::construct_children initialises start_
87 and stop_, and calls Sequential_music::construct_children, which
88 in turn calls Time_scaled_music_iterator::get_music which reads
92 Music *mus = get_music ();
93 Input *origin = mus->origin ();
95 SCM tuplet_symbol = ly_symbol2scm ("TupletEvent");
96 SCM start_scm = scm_call_2 (ly_lily_module_constant ("make-span-event"), tuplet_symbol, scm_from_int (START));
97 start_ = unsmob_music (start_scm);
98 start_->set_spot (*origin);
99 start_->set_property ("numerator", mus->get_property ("numerator"));
100 start_->set_property ("denominator", mus->get_property ("denominator"));
102 SCM stop_scm = scm_call_2 (ly_lily_module_constant ("make-span-event"), tuplet_symbol, scm_from_int (STOP));
103 stop_ = unsmob_music (stop_scm);
104 stop_->set_spot (*origin);
106 Moment *mp = unsmob_moment (get_outlet ()->get_property ("tupletSpannerDuration"));
110 spanner_duration_ = mp->main_part_;
111 next_split_mom_ = spanner_duration_;
114 Sequential_iterator::construct_children ();
118 Time_scaled_music_iterator::get_music_list () const
120 Music *mus = get_music ();
121 SCM child = mus->get_property ("element");
123 return scm_list_3 (start_->self_scm (), child, stop_->self_scm ());
127 Time_scaled_music_iterator::derived_mark () const
130 scm_gc_mark (start_->self_scm ());
132 scm_gc_mark (stop_->self_scm ());
134 Sequential_iterator::derived_mark ();
137 IMPLEMENT_CTOR_CALLBACK (Time_scaled_music_iterator);