source file of the GNU LilyPond music typesetter
- (c) 1998--2006 Han-Wen Nienhuys <hanwen@xs4all.nl>,
+ (c) 1998--2008 Han-Wen Nienhuys <hanwen@xs4all.nl>,
Erik Sandberg <mandolaerik@gmail.com>
*/
-#include "time-scaled-music-iterator.hh"
-
#include "context.hh"
#include "input.hh"
#include "international.hh"
#include "music.hh"
+#include "music-wrapper-iterator.hh"
+#include "stream-event.hh"
+
+/*
+ Iterates \times, by sending TupletSpanEvents 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 Music_wrapper_iterator
+{
+public:
+ DECLARE_SCHEME_CALLBACK (constructor, ());
+ /* construction */
+ DECLARE_CLASSNAME (Time_scaled_music_iterator);
+ Time_scaled_music_iterator ();
+protected:
+ virtual void process (Moment m);
+ virtual void construct_children ();
+ virtual void derived_mark () const;
+ virtual Moment pending_moment () const;
+
+ Music *create_event (Direction d);
+
+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. */
+ SCM synthesized_events_;
+
+ Context_handle tuplet_handler_;
+};
+
+Music*
+Time_scaled_music_iterator::create_event (Direction d)
+{
+ SCM ev_scm = scm_call_2 (ly_lily_module_constant ("make-span-event"),
+ ly_symbol2scm ("TupletSpanEvent"),
+ scm_from_int (d));
+
+ Music *mus = get_music ();
+
+ Music *ev = unsmob_music (ev_scm);
+ ev->set_spot (*mus->origin ());
+ if (d == START)
+ {
+ ev->set_property ("numerator", mus->get_property ("numerator"));
+ ev->set_property ("denominator", mus->get_property ("denominator"));
+ ev->set_property ("tweaks", mus->get_property ("tweaks"));
+ ev->set_property ("length", spanner_duration_.smobbed_copy ());
+ }
+
+ synthesized_events_ = scm_cons (ev_scm, synthesized_events_);
+ return ev;
+}
+
Time_scaled_music_iterator::Time_scaled_music_iterator ()
{
+ spanner_duration_ = next_split_mom_ = 0;
+ synthesized_events_ = SCM_EOL;
}
-SCM
-Time_scaled_music_iterator::get_music_list () const
+
+Moment
+Time_scaled_music_iterator::pending_moment () const
{
- 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);
+ Moment next_mom = Music_wrapper_iterator::pending_moment ();
+ next_mom = min (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_)
+ {
+ descend_to_bottom_context ();
+ if (tuplet_handler_.get_outlet ())
+ create_event (STOP)->send_to_context (tuplet_handler_.get_outlet ());
+
+ if (m.main_part_ < music_get_length ().main_part_)
+ {
+ tuplet_handler_.set_context (get_outlet ());
+ report_event (create_event (START));
+
+ next_split_mom_ += spanner_duration_;
+ }
+ else
+ {
+ tuplet_handler_.set_context (0);
+ }
+ }
+ Music_wrapper_iterator::process (m);
+ if (child_iter_ && child_iter_->ok ())
+ descend_to_child (child_iter_->get_outlet ());
+
+}
+
+void
+Time_scaled_music_iterator::construct_children ()
+{
+ spanner_duration_ = music_get_length ();
+
+ Moment *mp = unsmob_moment (get_outlet ()->get_property ("tupletSpannerDuration"));
+ if (mp)
+ spanner_duration_ = min (mp->main_part_, spanner_duration_);
+
+ Music_wrapper_iterator::construct_children ();
+
+ if (child_iter_ && child_iter_->ok ())
+ descend_to_child (child_iter_->get_outlet ());
+}
+
+void
+Time_scaled_music_iterator::derived_mark () const
+{
+ scm_gc_mark (synthesized_events_);
+ Music_wrapper_iterator::derived_mark ();
}
IMPLEMENT_CTOR_CALLBACK (Time_scaled_music_iterator);