lily/key-def.cc

   1 /*
   2   key-def.cc --  implement Key_def
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 1999--2000 Jan Nieuwenhuizen <janneke@gnu.org>
   7
   8  */
   9
  10 #include "key-def.hh"
  11 #include "debug.hh"
  12
  13 Key_def::Key_def ()
  14 {
  15   modality_i_ = 0;
  16   ordinary_key_b_ = false;
  17 }
  18
  19 int
  20 Key_def::ordinary_accidentals_i () const
  21 {
  22   if (!ordinary_key_b_)
  23     {
  24       programming_error ("Accidentals requested for non-conventional key");
  25       return 0;
  26     }
  27
  28   int p;
  29   if (pitch_arr_.size () < 1)
  30     {
  31       warning (_ ("No key name, assuming `C'"));
  32       p = 0;
  33     }
  34   else
  35     {
  36       p = pitch_arr_[0].semitone_pitch ();
  37       p += modality_i_;
  38     }
  39   /* Solve the equation 7*accidentals_i mod 12 = p, -6 <= accidentals_i <= 5 */
  40   int accidentals_i = (7*p) % 12;
  41   accidentals_i = (accidentals_i + 18) % 12 -6;
  42
  43   /* Correct from flats to sharps or vice versa */
  44   if (accidentals_i * pitch_arr_[0].accidental_i_ < 0)
  45     accidentals_i += 12 * sign (pitch_arr_[0].accidental_i_);
  46   return accidentals_i;
  47 }
  48
  49 int
  50 Key_def::flats_i () const
  51 {
  52   if (ordinary_key_b_)
  53     return 0 >? -ordinary_accidentals_i ();
  54   int flats_i = 0;
  55   for (int i = 0; i < pitch_arr_.size (); i++)
  56     {
  57       if (pitch_arr_[i].accidental_i_ < 0)
  58         flats_i -= pitch_arr_[i].accidental_i_;
  59     }
  60   return flats_i;
  61 }
  62
  63 bool
  64 Key_def::minor_b () const
  65 {
  66   return modality_i_ == 3;
  67 }
  68
  69 int
  70 Key_def::sharps_i () const
  71 {
  72   if (ordinary_key_b_)
  73     return 0 >? ordinary_accidentals_i ();
  74   int sharps_i = 0;
  75   for (int i = 0; i < pitch_arr_.size (); i++)
  76     {
  77       if (pitch_arr_[i].accidental_i_ > 0)
  78         sharps_i += pitch_arr_[i].accidental_i_;
  79     }
  80   return sharps_i;
  81 }
  82
  83 void
  84 Key_def::transpose (Musical_pitch d)
  85 {
  86   if (ordinary_key_b_ )
  87     {
  88       if (pitch_arr_.size () > 0)
  89         pitch_arr_[0].transpose (d);
  90       else
  91         {
  92           warning (_ ("Don't know how handle empty keys")); // TODO
  93         }
  94     }
  95   else
  96     {
  97       Array<Musical_pitch> old_pitch_arr_;
  98       for (int i = 0; i < pitch_arr_.size (); i++)
  99         {
 100           old_pitch_arr_.push (pitch_arr_[i]);
 101         }
 102       // set accidentals for \key d (as in Key_engraver::read_req)
 103       // (later called "new accidentals")
 104       int p = d.semitone_pitch ();
 105       /* Solve the equation 7*accidentals_i mod 12 = p, -6 <= accidentals_i <= 5 */
 106       int accidentals_i = (7*p) % 12;
 107       accidentals_i = (accidentals_i + 18) % 12 -6;
 108
 109       /* Correct from flats to sharps or vice versa */
 110       if (accidentals_i * d.accidental_i_ < 0)
 111       accidentals_i += 12 * sign (d.accidental_i_);
 112
 113       pitch_arr_.clear ();
 114       if (accidentals_i < 0)
 115         {
 116           int accidental = 6 ; // First accidental: bes
 117           for ( ; accidentals_i < 0 ; accidentals_i++ )
 118             {
 119               Musical_pitch m;
 120               m.accidental_i_ = -1;
 121               m.notename_i_ = accidental;
 122               pitch_arr_.push (m);
 123
 124               accidental = (accidental + 3) % 7 ;
 125             }
 126         }
 127       else
 128         {
 129           int accidental = 3 ; // First accidental: fis
 130           for ( ; accidentals_i > 0 ; accidentals_i-- )
 131             {
 132               Musical_pitch m;
 133               m.accidental_i_ = 1;
 134               m.notename_i_ = accidental;
 135               pitch_arr_.push (m);
 136
 137               accidental = (accidental + 4) % 7 ;
 138             }
 139         }
 140       // Check if transposed old accidentals and the new ones coincide
 141       accidentals_i = pitch_arr_.size ();
 142       int acc_found;
 143       Musical_pitch mm;
 144       for (int i=0; i < old_pitch_arr_.size (); i++)
 145         {
 146           acc_found = 0;
 147           mm = old_pitch_arr_[i];
 148           mm.transpose (d);
 149           for (int j=0; ( (j < accidentals_i) && (acc_found == 0)); j++)
 150             {
 151               if (pitch_arr_[j].notename_i_ == mm.notename_i_)
 152                 {
 153                   if (mm.accidental_i_ == 0)
 154                     {
 155                       // remove new accidental
 156                       pitch_arr_.del (j);
 157                       accidentals_i--;
 158                       acc_found = 1;
 159                     }
 160                   else
 161                     {
 162                       // change new accidental
 163                       pitch_arr_[j].accidental_i_ = mm.accidental_i_;
 164                       acc_found = 1;
 165                     }
 166                 }
 167             }
 168           if (acc_found == 0)
 169             {
 170               // add transposed old accidental
 171               pitch_arr_.push (mm);
 172             }
 173         }
 174     }
 175 }
 176
 177 void
 178 Key_def::squash_octaves ()
 179 {
 180   for (int i=0; i < pitch_arr_.size (); i++)
 181     {
 182       pitch_arr_[i].octave_i_ = 0;
 183     }
 184 }