lily/chord-tremolo-iterator.cc

   1 /*
   2   chord-tremolo-iterator.cc -- implement Chord_tremolo_iterator
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 2000--2009 Han-Wen Nienhuys <hanwen@xs4all.nl>
   7                  Erik Sandberg <mandolaerik@gmail.com>
   8 */
   9
  10 #include "chord-tremolo-iterator.hh"
  11
  12 #include "input.hh"
  13 #include "international.hh"
  14 #include "misc.hh"
  15 #include "repeated-music.hh"
  16
  17 Chord_tremolo_iterator::Chord_tremolo_iterator ()
  18 {
  19 }
  20
  21 SCM
  22 Chord_tremolo_iterator::get_music_list () const
  23 {
  24   Music *mus = get_music ();
  25   Input *origin = mus->origin ();
  26   Moment l = mus->get_length ();
  27   Music *body = Repeated_music::body (mus);
  28   bool body_is_sequential = body->is_mus_type ("sequential-music");
  29
  30   int elt_count = body_is_sequential ? scm_ilength (body->get_property ("elements")) : 1;
  31
  32   if (body_is_sequential &&
  33       (elt_count != 2
  34        && elt_count != 1))
  35     mus->origin ()->warning (_f ("expect 2 elements for chord tremolo, found %d", elt_count));
  36
  37   if (elt_count <= 0)
  38     elt_count = 1;
  39
  40   if (elt_count == 1)
  41     {
  42       Music *ev = make_music_by_name (ly_symbol2scm ("TremoloEvent"));
  43       ev->set_spot (*origin);
  44       ev->set_property ("repeat-count", mus->get_property ("repeat-count"));
  45       ev->set_property ("tremolo-type", mus->get_property ("tremolo-type"));
  46       return scm_list_2 (ev->unprotect (), body->self_scm ());
  47     }
  48   else
  49     {
  50       SCM tremolo_symbol = ly_symbol2scm ("TremoloSpanEvent");
  51       SCM start_event_scm = scm_call_2 (ly_lily_module_constant ("make-span-event"), tremolo_symbol, scm_from_int (START));
  52       unsmob_music (start_event_scm)->set_spot (*origin);
  53       SCM stop_event_scm = scm_call_2 (ly_lily_module_constant ("make-span-event"), tremolo_symbol, scm_from_int (STOP));
  54
  55       Music *start_event = unsmob_music (start_event_scm);
  56       Music *stop_event = unsmob_music (stop_event_scm);
  57       start_event->set_spot (*origin);
  58       stop_event->set_spot (*origin);
  59       start_event->set_property ("repeat-count", mus->get_property ("repeat-count"));
  60       start_event->set_property ("tremolo-type", mus->get_property ("tremolo-type"));
  61
  62       return scm_list_3 (start_event_scm, body->self_scm (), stop_event_scm);
  63     }
  64 }
  65
  66 IMPLEMENT_CTOR_CALLBACK (Chord_tremolo_iterator);