lily/key-item.cc

   1 /*
   2   key-item.cc -- implement Key_item
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 1996--2000 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   7
   8   keyplacement by Mats Bengtsson
   9 */
  10
  11 #include "group-interface.hh"
  12 #include "key-item.hh"
  13 #include "molecule.hh"
  14 #include "paper-def.hh"
  15 #include "lookup.hh"
  16 #include "staff-symbol-referencer.hh"
  17
  18 Key_item::Key_item (SCM s)
  19   : Item (s)
  20 {
  21   set_elt_property ("c0-position", gh_int2scm (0));
  22 }
  23
  24
  25 /*
  26   FIXME: too much hardcoding here.
  27  */
  28 const int FLAT_TOP_PITCH=2; /* fes,ges,as and bes typeset in lower octave */
  29 const int SHARP_TOP_PITCH=4; /*  ais and bis typeset in lower octave */
  30
  31
  32 /*
  33   FIXME: key-item should just get a list of (position, acc), and leave
  34   the thinking to other parties.
  35  */
  36 int
  37 Key_item::calculate_position(SCM pair) const
  38 {
  39   int p = gh_scm2int (gh_car (pair));
  40   int a = gh_scm2int (gh_cdr (pair));
  41
  42   if (to_boolean (get_elt_property ("multi-octave")))
  43     {
  44       return p + gh_scm2int (get_elt_property ("c0-position"));
  45     }
  46   else {
  47     // Find the c in the range -4 through 2
  48     int from_bottom_pos = gh_scm2int (get_elt_property ("c0-position")) + 4;
  49     from_bottom_pos = from_bottom_pos%7;
  50     from_bottom_pos = (from_bottom_pos + 7)%7; // Precaution to get positive.
  51     int c0 = from_bottom_pos - 4;
  52
  53
  54     if ((a<0 && ((p>FLAT_TOP_PITCH) || (p+c0>4)) && (p+c0>1))
  55         ||
  56         (a>0 && ((p>SHARP_TOP_PITCH) || (p+c0>5)) && (p+c0>2)))
  57       {
  58         p -= 7; /* Typeset below c_position */
  59       }
  60     /* Provide for the four cases in which there's a glitch
  61        it's a hack, but probably not worth
  62        the effort of finding a nicer solution.
  63        --dl. */
  64     if (c0==2 && a>0 && p==3)
  65       p -= 7;
  66     if (c0==-3 && a>0 && p==-1)
  67       p += 7;
  68     if (c0==-4 && a<0 && p==-1)
  69       p += 7;
  70     if (c0==-2 && a<0 && p==-3)
  71       p += 7;
  72
  73     return p + c0;
  74   }
  75 }
  76
  77 /*
  78   TODO
  79   - space the `natural' signs wider
  80  */
  81 GLUE_SCORE_ELEMENT(Key_item,brew_molecule);
  82 SCM
  83 Key_item::member_brew_molecule () const
  84 {
  85   Molecule mol;
  86
  87   Staff_symbol_referencer_interface si (this);
  88   Real inter = si.staff_space ()/2.0;
  89
  90   SCM newas = get_elt_property ("new-accidentals");
  91
  92   /*
  93     SCM lists are stacks, so we work from right to left, ending with
  94     the cancellation signature.
  95   */
  96   for (SCM s = newas; gh_pair_p (s); s = gh_cdr (s))
  97     {
  98       int a = gh_scm2int (gh_cdar (s));
  99       Molecule m = lookup_l ()->afm_find ("accidentals-" + to_str (a));
 100       m.translate_axis (calculate_position(gh_car (s)) * inter, Y_AXIS);
 101       mol.add_at_edge (X_AXIS, LEFT, m, 0);
 102     }
 103
 104   if (break_status_dir () != RIGHT)
 105     {
 106       SCM old = get_elt_property ("old-accidentals");
 107       /*
 108         Add half a space between  cancellation and key sig.
 109
 110         As suggested by [Ross], p.148.
 111        */
 112       Interval x(0, inter);
 113       Interval y(0,0);
 114
 115       mol.add_at_edge (X_AXIS, LEFT, lookup_l()->blank (Box(x,y)),0);
 116
 117       for (; gh_pair_p (old); old = gh_cdr (old))
 118         {
 119           SCM found = SCM_EOL;
 120
 121           /*
 122             find correspondences in pitches
 123            */
 124           for (SCM s = newas; gh_pair_p (s); s = gh_cdr (s))
 125             if (gh_caar(s) == gh_caar (old))
 126               found  = gh_car (s);
 127
 128           if (found == SCM_EOL || gh_cdr (found) != gh_cdar (old))
 129             {
 130               Molecule m =lookup_l ()->afm_find ("accidentals-0");
 131
 132               m.translate_axis (calculate_position(gh_car(old)) * inter, Y_AXIS);
 133               mol.add_at_edge (X_AXIS, LEFT, m,0);
 134             }
 135         }
 136     }
 137
 138   return mol.create_scheme();
 139 }
 140
 141
 142
 143