Erik Sandberg <mandolaerik@gmail.com>
*/
-#include "time-scaled-music-iterator.hh"
-
#include "context.hh"
#include "input.hh"
#include "international.hh"
#include "music.hh"
+#include "sequential-iterator.hh"
+
+/*
+ Iterates \times, by sending TupletEvents at the start/end of each
+ tuplet bracket. Extra stop/start events are sent at regular
+ intervals if tupletSpannerDuration is set.
+*/
+class Time_scaled_music_iterator : public Sequential_iterator
+{
+public:
+ DECLARE_SCHEME_CALLBACK (constructor, ());
+ /* construction */
+ DECLARE_CLASSNAME(Time_scaled_music_iterator);
+ Time_scaled_music_iterator ();
+protected:
+ virtual SCM get_music_list () const;
+ virtual void process (Moment m);
+ virtual void construct_children ();
+ virtual void derived_mark () const;
+ virtual Moment pending_moment () const;
+private:
+ /* tupletSpannerDuration */
+ Moment spanner_duration_;
+ /* next time to add a stop/start pair */
+ Moment next_split_mom_;
+ /* Recycle start/stop events if tupletSpannerDuration is set. */
+ Music *start_;
+ Music *stop_;
+};
Time_scaled_music_iterator::Time_scaled_music_iterator ()
{
+ spanner_duration_ = next_split_mom_ = 0;
}
-SCM
-Time_scaled_music_iterator::get_music_list () const
+
+Moment
+Time_scaled_music_iterator::pending_moment () const
+{
+ Moment next_mom = Sequential_iterator::pending_moment ();
+
+ if (spanner_duration_.to_bool () &&
+ next_mom.main_part_ > next_split_mom_)
+ {
+ next_mom = next_split_mom_;
+ }
+
+ return next_mom;
+}
+
+
+void
+Time_scaled_music_iterator::process (Moment m)
+{
+ if (spanner_duration_.to_bool () &&
+ m.main_part_ == next_split_mom_)
+ {
+ report_event (stop_);
+ report_event (start_);
+ next_split_mom_ += spanner_duration_;
+ /* avoid sending events twice at the end */
+ if (next_split_mom_ == get_music ()->get_length ().main_part_)
+ next_split_mom_.set_infinite (1);
+ }
+ Sequential_iterator::process(m);
+}
+
+void
+Time_scaled_music_iterator::construct_children ()
{
+ /*
+ Inheritance trickery:
+ Time_scaled_music_iterator::construct_children initialises start_
+ and stop_, and calls Sequential_music::construct_children, which
+ in turn calls Time_scaled_music_iterator::get_music which reads
+ start_ and stop_.
+ */
+
Music *mus = get_music ();
Input *origin = mus->origin ();
- Music *child = unsmob_music (mus->get_property ("element"));
- /* Create tuplet start/stop span events before/after the music */
SCM tuplet_symbol = ly_symbol2scm ("TupletEvent");
- SCM start_event = scm_call_2 (ly_lily_module_constant ("make-span-event"), tuplet_symbol, scm_from_int (START));
- Music *start = unsmob_music (start_event);
- start->set_spot (*origin);
- start->set_property ("numerator", mus->get_property ("numerator"));
- start->set_property ("denominator", mus->get_property ("denominator"));
- start_event = scm_call_1 (ly_lily_module_constant ("make-event-chord"), scm_list_1 (start_event));
- unsmob_music (start_event)->set_spot (*origin);
-
- SCM stop_event = scm_call_2 (ly_lily_module_constant ("make-span-event"), tuplet_symbol, scm_from_int (STOP));
- unsmob_music (stop_event)->set_spot (*origin);
- stop_event = scm_call_1 (ly_lily_module_constant ("make-event-chord"), scm_list_1 (stop_event));
- unsmob_music (stop_event)->set_spot (*origin);
-
- return scm_list_3 (start_event, child->self_scm (), stop_event);
+ SCM start_scm = scm_call_2 (ly_lily_module_constant ("make-span-event"), tuplet_symbol, scm_from_int (START));
+ start_ = unsmob_music (start_scm);
+ start_->set_spot (*origin);
+ start_->set_property ("numerator", mus->get_property ("numerator"));
+ start_->set_property ("denominator", mus->get_property ("denominator"));
+
+ SCM stop_scm = scm_call_2 (ly_lily_module_constant ("make-span-event"), tuplet_symbol, scm_from_int (STOP));
+ stop_ = unsmob_music (stop_scm);
+ stop_->set_spot (*origin);
+
+ Moment *mp = unsmob_moment (get_outlet ()->get_property ("tupletSpannerDuration"));
+
+ if (mp)
+ {
+ spanner_duration_ = mp->main_part_;
+ next_split_mom_ = spanner_duration_;
+ }
+
+ Sequential_iterator::construct_children ();
+}
+
+SCM
+Time_scaled_music_iterator::get_music_list () const
+{
+ Music *mus = get_music ();
+ SCM child = mus->get_property ("element");
+
+ return scm_list_3 (start_->self_scm (), child, stop_->self_scm ());
+}
+
+void
+Time_scaled_music_iterator::derived_mark () const
+{
+ if (start_)
+ scm_gc_mark (start_->self_scm ());
+ if (stop_)
+ scm_gc_mark (stop_->self_scm ());
+
+ Sequential_iterator::derived_mark ();
}
IMPLEMENT_CTOR_CALLBACK (Time_scaled_music_iterator);