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, 1997--1999 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   7
   8   keyplacement by Mats Bengtsson
   9 */
  10
  11 #include "key-item.hh"
  12 #include "key.hh"
  13 #include "debug.hh"
  14 #include "molecule.hh"
  15 #include "paper-def.hh"
  16 #include "lookup.hh"
  17 #include "musical-pitch.hh"
  18 #include "staff-symbol-referencer.hh"
  19
  20 const int FLAT_TOP_PITCH=2; /* fes,ges,as and bes typeset in lower octave */
  21 const int SHARP_TOP_PITCH=4; /*  ais and bis typeset in lower octave */
  22
  23 Key_item::Key_item ()
  24 {
  25   multi_octave_b_ = false;
  26   set_elt_property ("breakable", SCM_BOOL_T);
  27   set_c_position (0);
  28 }
  29
  30 int
  31 Key_item::get_c_position () const
  32 {
  33   // Find the c in the range -4 through 2
  34   int from_bottom_pos = c0_position_ + 4;
  35   from_bottom_pos = from_bottom_pos%7;
  36   from_bottom_pos = (from_bottom_pos + 7)%7; // Precaution to get positive.
  37   return from_bottom_pos - 4;
  38 }
  39
  40
  41 void
  42 Key_item::set_c_position (int c0)
  43 {
  44   c0_position_ = c0;
  45 }
  46
  47
  48 void
  49 Key_item::add (int p, int a)
  50 {
  51   pitch_arr_.push (p);
  52   acc_arr_.push (a);
  53 }
  54
  55 void
  56 Key_item::add_old (int p, int a)
  57 {
  58   old_pitch_arr_.push (p);
  59   old_acc_arr_.push (a);
  60 }
  61
  62
  63 int
  64 Key_item::calculate_position(int p, int a) const
  65 {
  66   if (multi_octave_b_)
  67     {
  68       return p + c0_position_;
  69     }
  70   else {
  71     if ((a<0 && ((p>FLAT_TOP_PITCH) || (p+get_c_position ()>4)) && (p+get_c_position ()>1))
  72         ||
  73         (a>0 && ((p>SHARP_TOP_PITCH) || (p+get_c_position ()>5)) && (p+get_c_position ()>2)))
  74       {
  75         p -= 7; /* Typeset below c_position */
  76       }
  77     /* Provide for the four cases in which there's a glitch */
  78     /* it's a hack, but probably not worth */
  79     /* the effort of finding a nicer solution. dl. */
  80     if (get_c_position ()==2 && a>0 && p==3)
  81       p -= 7;
  82     if (get_c_position ()==-3 && a>0 && p==-1)
  83       p += 7;
  84     if (get_c_position ()==-4 && a<0 && p==-1)
  85       p += 7;
  86     if (get_c_position ()==-2 && a<0 && p==-3)
  87       p += 7;
  88     return p + get_c_position ();
  89   }
  90 }
  91
  92 /*
  93   TODO
  94   - space the `natural' signs wider
  95   - dehair this
  96  */
  97 Molecule*
  98 Key_item::do_brew_molecule_p() const
  99 {
 100   Molecule*output = new Molecule;
 101
 102   Staff_symbol_referencer_interface si (this);
 103   Real inter = si.staff_space ()/2.0;
 104
 105   int j;
 106   if ((break_status_dir () == LEFT || break_status_dir () == CENTER)
 107       || old_pitch_arr_.size ())
 108     {
 109       for (int i =0; i < old_pitch_arr_.size(); i++)
 110         {
 111           for (j =0; (j < pitch_arr_.size())
 112                  && (old_pitch_arr_[i] != pitch_arr_[j]); j++)
 113             ;
 114
 115           if (j == pitch_arr_.size()
 116               || (old_pitch_arr_[i] == pitch_arr_[j]
 117                   && old_acc_arr_[i] != acc_arr_[j]))
 118             {
 119               Molecule m =lookup_l ()->afm_find ("accidentals-0");
 120
 121               m.translate_axis (calculate_position(old_pitch_arr_[i], old_acc_arr_[i]) * inter, Y_AXIS);
 122               output->add_at_edge (X_AXIS, RIGHT, m,0);
 123             }
 124         }
 125
 126       /*
 127         Add half a space between  cancellation and key sig.
 128
 129         As suggested by [Ross], p.148.
 130        */
 131       Interval x(0, inter);
 132       Interval y(0,0);
 133
 134       output->add_at_edge (X_AXIS, RIGHT, lookup_l()->fill (Box(x,y)),0);
 135     }
 136
 137   for (int i =0; i < pitch_arr_.size(); i++)
 138     {
 139       Molecule m = lookup_l ()->afm_find ("accidentals-" + to_str (acc_arr_[i]));
 140       m.translate_axis (calculate_position(pitch_arr_[i], acc_arr_[i]) * inter, Y_AXIS);
 141       output->add_at_edge (X_AXIS, RIGHT, m, 0);
 142     }
 143
 144   return output;
 145 }
 146
 147
 148
 149