lily/chord-tremolo-iterator.cc

   1 /*
   2   This file is part of LilyPond, the GNU music typesetter.
   3
   4   Copyright (C) 2000--2010 Han-Wen Nienhuys <hanwen@xs4all.nl>
   5                  Erik Sandberg <mandolaerik@gmail.com>
   6
   7   LilyPond is free software: you can redistribute it and/or modify
   8   it under the terms of the GNU General Public License as published by
   9   the Free Software Foundation, either version 3 of the License, or
  10   (at your option) any later version.
  11
  12   LilyPond is distributed in the hope that it will be useful,
  13   but WITHOUT ANY WARRANTY; without even the implied warranty of
  14   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15   GNU General Public License for more details.
  16
  17   You should have received a copy of the GNU General Public License
  18   along with LilyPond.  If not, see <http://www.gnu.org/licenses/>.
  19 */
  20
  21 #include "chord-tremolo-iterator.hh"
  22
  23 #include "input.hh"
  24 #include "international.hh"
  25 #include "misc.hh"
  26 #include "repeated-music.hh"
  27
  28 Chord_tremolo_iterator::Chord_tremolo_iterator ()
  29 {
  30 }
  31
  32 SCM
  33 Chord_tremolo_iterator::get_music_list () const
  34 {
  35   Music *mus = get_music ();
  36   Input *origin = mus->origin ();
  37   Moment l = mus->get_length ();
  38   Music *body = Repeated_music::body (mus);
  39   bool body_is_sequential = body->is_mus_type ("sequential-music");
  40
  41   int elt_count = body_is_sequential ? scm_ilength (body->get_property ("elements")) : 1;
  42
  43   if (body_is_sequential &&
  44       (elt_count != 2
  45        && elt_count != 1))
  46     mus->origin ()->warning (_f ("expect 2 elements for chord tremolo, found %d", elt_count));
  47
  48   if (elt_count <= 0)
  49     elt_count = 1;
  50
  51   if (elt_count == 1)
  52     {
  53       Music *ev = make_music_by_name (ly_symbol2scm ("TremoloEvent"));
  54       ev->set_spot (*origin);
  55       ev->set_property ("repeat-count", mus->get_property ("repeat-count"));
  56       ev->set_property ("tremolo-type", mus->get_property ("tremolo-type"));
  57       return scm_list_2 (ev->unprotect (), body->self_scm ());
  58     }
  59   else
  60     {
  61       SCM tremolo_symbol = ly_symbol2scm ("TremoloSpanEvent");
  62       SCM start_event_scm = scm_call_2 (ly_lily_module_constant ("make-span-event"), tremolo_symbol, scm_from_int (START));
  63       unsmob_music (start_event_scm)->set_spot (*origin);
  64       SCM stop_event_scm = scm_call_2 (ly_lily_module_constant ("make-span-event"), tremolo_symbol, scm_from_int (STOP));
  65
  66       Music *start_event = unsmob_music (start_event_scm);
  67       Music *stop_event = unsmob_music (stop_event_scm);
  68       start_event->set_spot (*origin);
  69       stop_event->set_spot (*origin);
  70       start_event->set_property ("repeat-count", mus->get_property ("repeat-count"));
  71       start_event->set_property ("tremolo-type", mus->get_property ("tremolo-type"));
  72
  73       return scm_list_3 (start_event_scm, body->self_scm (), stop_event_scm);
  74     }
  75 }
  76
  77 IMPLEMENT_CTOR_CALLBACK (Chord_tremolo_iterator);