lily/event.cc

   1 /*
   2   event.cc -- implement Event
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 1996--2003 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_mus_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_mus_property ("duration"));
  29   if (d)
  30     set_mus_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_mus_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_mus_property ("pitch", np.smobbed_copy ());
  54 }
  55
  56 Pitch
  57 Event::to_relative_octave (Pitch last)
  58 {
  59   Pitch *old_pit = unsmob_pitch (get_mus_property ("pitch"));
  60   if (old_pit)
  61     {
  62       Pitch new_pit = *old_pit;
  63       new_pit = new_pit.to_relative_octave (last);
  64       set_mus_property ("pitch", new_pit.smobbed_copy ());
  65
  66       return new_pit;
  67     }
  68   return last;
  69 }
  70
  71 Event::Event ()
  72   : Music ()
  73 {
  74 }
  75
  76 ADD_MUSIC(Event);
  77 LY_DEFINE(ly_music_duration_length, "ly:music-duration-length", 1, 0,0,
  78           (SCM mus),
  79           "Extract the duration field from @var{mus}, and return the length.")
  80 {
  81   Music* m =   unsmob_music(mus);
  82   SCM_ASSERT_TYPE(m, mus, SCM_ARG1, __FUNCTION__, "Music");
  83
  84   Duration *d = unsmob_duration (m->get_mus_property ("duration"));
  85
  86   Moment l ;
  87
  88   if (d)
  89     {
  90       l = d->get_length ();
  91     }
  92   else
  93     programming_error("Music has no duration");
  94   return l.smobbed_copy();
  95
  96 }
  97
  98
  99 LY_DEFINE(ly_music_duration_compress, "ly:music-duration-compress", 2, 0,0,
 100           (SCM mus, SCM factor),
 101           "Extract the duration field from @var{mus}, and compress it.")
 102 {
 103   Music* m =   unsmob_music(mus);
 104   Moment * f = unsmob_moment (factor);
 105   SCM_ASSERT_TYPE(m, mus, SCM_ARG1, __FUNCTION__, "Music");
 106   SCM_ASSERT_TYPE(f, factor, SCM_ARG2, __FUNCTION__, "Moment");
 107
 108   Duration *d = unsmob_duration (m->get_mus_property ("duration"));
 109   if (d)
 110     m->set_mus_property ("duration", d->compressed (f->main_part_).smobbed_copy());
 111   return SCM_UNSPECIFIED;
 112 }
 113
 114
 115
 116 /*
 117   This is hairy, since the scale in a key-change event may contain
 118   octaveless notes.
 119
 120
 121   TODO: this should use ly:pitch.
 122  */
 123 LY_DEFINE(ly_transpose_key_alist, "ly:transpose-key-alist",
 124           2, 0,0, (SCM l, SCM pitch),
 125           "Make a new key alist of @var{l} transposed by pitch @var{pitch}")
 126 {
 127   SCM newlist = SCM_EOL;
 128   Pitch *p = unsmob_pitch (pitch);
 129
 130   for (SCM s = l; gh_pair_p (s); s = ly_cdr (s))
 131     {
 132       SCM key = ly_caar (s);
 133       SCM alter = ly_cdar (s);
 134       if (gh_pair_p (key))
 135         {
 136           Pitch orig (gh_scm2int (ly_car (key)),
 137                       gh_scm2int (ly_cdr (key)),
 138                       gh_scm2int (alter));
 139
 140           orig =orig.transposed (*p);
 141
 142           SCM key = gh_cons (scm_int2num (orig.get_octave ()),
 143                              scm_int2num (orig.get_notename ()));
 144
 145           newlist = gh_cons (gh_cons (key, scm_int2num (orig.get_alteration ())),
 146                              newlist);
 147         }
 148       else if (gh_number_p (key))
 149         {
 150           Pitch orig (0, gh_scm2int (key), gh_scm2int (alter));
 151           orig = orig.transposed (*p);
 152
 153           key =scm_int2num (orig.get_notename ());
 154           alter = scm_int2num (orig.get_alteration());
 155           newlist = gh_cons (gh_cons (key, alter), newlist);
 156         }
 157     }
 158   return scm_reverse_x (newlist, SCM_EOL);
 159 }
 160
 161 void
 162 Key_change_ev::transpose (Pitch p)
 163 {
 164   SCM pa = get_mus_property ("pitch-alist");
 165
 166   set_mus_property ("pitch-alist", ly_transpose_key_alist (pa, p.smobbed_copy()));
 167   Pitch tonic = *unsmob_pitch (get_mus_property ("tonic"));
 168   set_mus_property ("tonic",
 169                     tonic.smobbed_copy ());
 170 }
 171
 172 bool
 173 alist_equal_p (SCM a, SCM b)
 174 {
 175   for (SCM s = a;
 176        gh_pair_p (s); s = ly_cdr (s))
 177     {
 178       SCM key = ly_caar (s);
 179       SCM val = ly_cdar (s);
 180       SCM l = scm_assoc (key, b);
 181
 182       if (l == SCM_BOOL_F
 183           || !gh_equal_p ( ly_cdr (l), val))
 184
 185         return false;
 186     }
 187   return true;
 188 }
 189 ADD_MUSIC (Key_change_ev);