- Music *mus = get_music ();
- Input *origin = mus->origin ();
- Moment l = mus->get_length ();
- Music *body = Repeated_music::body (mus);
- bool body_is_sequential = body->is_mus_type ("sequential-music");
-
- int elt_count = body_is_sequential ? scm_ilength (body->get_property ("elements")) : 1;
-
- if (body_is_sequential &&
- (elt_count != 2
- && elt_count != 1))
- mus->origin ()->warning (_f ("expect 2 elements for chord tremolo, found %d", elt_count));
-
- if (elt_count <= 0)
- elt_count = 1;
-
- Rational total_dur = l.main_part_;
- Rational note_dur = total_dur / Rational (elt_count * Repeated_music::repeat_count (mus));
-
- SCM tremolo_type = scm_int2num (note_dur.den ());
- int expected_beaming_ = max (0, (intlog2 (total_dur.den ()) - 2));
-
- if (elt_count == 1)
- {
- Music *ev = make_music_by_name (ly_symbol2scm ("TremoloEvent"));
- ev->set_spot (*origin);
- ev->set_property ("tremolo-type", tremolo_type);
- return scm_list_2 (ev->unprotect (), body->self_scm ());
- }
- else
- {
- SCM tremolo_symbol = ly_symbol2scm ("TremoloSpanEvent");
- SCM start_event_scm = scm_call_2 (ly_lily_module_constant ("make-span-event"), tremolo_symbol, scm_from_int (START));
- unsmob_music (start_event_scm)->set_spot (*origin);
- SCM stop_event_scm = scm_call_2 (ly_lily_module_constant ("make-span-event"), tremolo_symbol, scm_from_int (STOP));
-
- Music *start_event = unsmob_music (start_event_scm);
- Music *stop_event = unsmob_music (stop_event_scm);
- start_event->set_spot (*origin);
- stop_event->set_spot (*origin);
- start_event->set_property ("tremolo-type", tremolo_type);
- start_event->set_property ("expected-beam-count", scm_int2num (expected_beaming_));
-
- return scm_list_3 (start_event_scm, body->self_scm (), stop_event_scm);
- }