lily/event.cc

   1 /*
   2   event.cc -- implement Event
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 1996--2004 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   7 */
   8
   9 #include "event.hh"
  10 #include "warn.hh"
  11 #include "event.hh"
  12
  13 Moment
  14 Event::get_length () const
  15 {
  16   Duration *d = unsmob_duration (get_property ("duration"));
  17   if (!d)
  18     {
  19       Moment m ;
  20       return m;
  21     }
  22   return d->get_length ();
  23 }
  24
  25 void
  26 Event::compress (Moment m)
  27 {
  28   Duration *d =  unsmob_duration (get_property ("duration"));
  29   if (d)
  30     set_property ("duration", d ->compressed (m.main_part_).smobbed_copy ());
  31 }
  32
  33 void
  34 Event::transpose (Pitch delta)
  35 {
  36   /*
  37     TODO: should change music representation such that
  38     _all_ pitch values are transposed automatically.
  39    */
  40
  41   Pitch *p = unsmob_pitch (get_property ("pitch"));
  42   if (!p)
  43     return ;
  44
  45   Pitch np = p->transposed (delta);
  46
  47   if (abs (np.get_alteration ()) > DOUBLE_SHARP)
  48     {
  49         warning (_f ("Transposition by %s makes alteration larger than two",
  50           delta.to_string ()));
  51     }
  52
  53   set_property ("pitch", np.smobbed_copy ());
  54 }
  55
  56 Pitch
  57 Event::to_relative_octave (Pitch last)
  58 {
  59   Pitch *old_pit = unsmob_pitch (get_property ("pitch"));
  60   if (old_pit)
  61     {
  62       Pitch new_pit = *old_pit;
  63       new_pit = new_pit.to_relative_octave (last);
  64
  65       SCM check = get_property ("absolute-octave");
  66       if (gh_number_p (check) &&
  67           new_pit.get_octave () != gh_scm2int (check))
  68         {
  69           String s =_("Failed octave check, got: ");
  70           s += new_pit.to_string ();
  71           new_pit = Pitch (gh_scm2int (check),
  72                            new_pit.get_notename (),
  73                            new_pit.get_alteration ());
  74
  75           s += " expected ";
  76           s += new_pit.to_string ();
  77           origin ()->warning (s);
  78         }
  79
  80       set_property ("pitch", new_pit.smobbed_copy ());
  81
  82       return new_pit;
  83     }
  84   return last;
  85 }
  86
  87 Event::Event ()
  88   : Music ()
  89 {
  90 }
  91
  92 ADD_MUSIC (Event);
  93
  94 LY_DEFINE (ly_music_duration_length, "ly:music-duration-length", 1, 0,0,
  95           (SCM mus),
  96           "Extract the duration field from @var{mus}, and return the length.")
  97 {
  98   Music* m =   unsmob_music (mus);
  99   SCM_ASSERT_TYPE (m, mus, SCM_ARG1, __FUNCTION__, "Music");
 100
 101   Duration *d = unsmob_duration (m->get_property ("duration"));
 102
 103   Moment l ;
 104
 105   if (d)
 106     {
 107       l = d->get_length ();
 108     }
 109   else
 110     programming_error ("Music has no duration");
 111   return l.smobbed_copy ();
 112
 113 }
 114
 115
 116 LY_DEFINE (ly_music_duration_compress, "ly:music-duration-compress", 2, 0,0,
 117           (SCM mus, SCM fact),
 118           "Compress @var{mus} by factor @var{fact}, which is a @code{Moment}.")
 119 {
 120   Music* m =   unsmob_music (mus);
 121   Moment * f = unsmob_moment (fact);
 122   SCM_ASSERT_TYPE (m, mus, SCM_ARG1, __FUNCTION__, "Music");
 123   SCM_ASSERT_TYPE (f, fact, SCM_ARG2, __FUNCTION__, "Moment");
 124
 125   Duration *d = unsmob_duration (m->get_property ("duration"));
 126   if (d)
 127     m->set_property ("duration", d->compressed (f->main_part_).smobbed_copy ());
 128   return SCM_UNSPECIFIED;
 129 }
 130
 131
 132
 133 /*
 134   This is hairy, since the scale in a key-change event may contain
 135   octaveless notes.
 136
 137
 138   TODO: this should use ly:pitch.
 139  */
 140 LY_DEFINE (ly_transpose_key_alist, "ly:transpose-key-alist",
 141           2, 0, 0, (SCM l, SCM pit),
 142           "Make a new key alist of @var{l} transposed by pitch @var{pit}")
 143 {
 144   SCM newlist = SCM_EOL;
 145   Pitch *p = unsmob_pitch (pit);
 146
 147   for (SCM s = l; gh_pair_p (s); s = ly_cdr (s))
 148     {
 149       SCM key = ly_caar (s);
 150       SCM alter = ly_cdar (s);
 151       if (gh_pair_p (key))
 152         {
 153           Pitch orig (gh_scm2int (ly_car (key)),
 154                       gh_scm2int (ly_cdr (key)),
 155                       gh_scm2int (alter));
 156
 157           orig =orig.transposed (*p);
 158
 159           SCM key = gh_cons (scm_int2num (orig.get_octave ()),
 160                              scm_int2num (orig.get_notename ()));
 161
 162           newlist = gh_cons (gh_cons (key, scm_int2num (orig.get_alteration ())),
 163                              newlist);
 164         }
 165       else if (gh_number_p (key))
 166         {
 167           Pitch orig (0, gh_scm2int (key), gh_scm2int (alter));
 168           orig = orig.transposed (*p);
 169
 170           key =scm_int2num (orig.get_notename ());
 171           alter = scm_int2num (orig.get_alteration ());
 172           newlist = gh_cons (gh_cons (key, alter), newlist);
 173         }
 174     }
 175   return scm_reverse_x (newlist, SCM_EOL);
 176 }
 177
 178 void
 179 Key_change_ev::transpose (Pitch p)
 180 {
 181   SCM pa = get_property ("pitch-alist");
 182
 183   set_property ("pitch-alist", ly_transpose_key_alist (pa, p.smobbed_copy ()));
 184   Pitch tonic = *unsmob_pitch (get_property ("tonic"));
 185   set_property ("tonic",
 186                     tonic.smobbed_copy ());
 187 }
 188
 189 bool
 190 alist_equal_p (SCM a, SCM b)
 191 {
 192   for (SCM s = a;
 193        gh_pair_p (s); s = ly_cdr (s))
 194     {
 195       SCM key = ly_caar (s);
 196       SCM val = ly_cdar (s);
 197       SCM l = scm_assoc (key, b);
 198
 199       if (l == SCM_BOOL_F
 200           || !gh_equal_p ( ly_cdr (l), val))
 201
 202         return false;
 203     }
 204   return true;
 205 }
 206 ADD_MUSIC (Key_change_ev);