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
  19 const int FLAT_TOP_PITCH=2; /* fes,ges,as and bes typeset in lower octave */
  20 const int SHARP_TOP_PITCH=4; /*  ais and bis typeset in lower octave */
  21
  22 Key_item::Key_item ()
  23 {
  24   multi_octave_b_ = false;
  25   set_elt_property (breakable_scm_sym, SCM_BOOL_T);
  26   set_c_position (0);
  27 }
  28
  29 int
  30 Key_item::get_c_position () const
  31 {
  32   // Find the c in the range -4 through 2
  33   int from_bottom_pos = c0_position_ + 4;
  34   from_bottom_pos = from_bottom_pos%7;
  35   from_bottom_pos = (from_bottom_pos + 7)%7; // Precaution to get positive.
  36   return from_bottom_pos - 4;
  37 }
  38
  39
  40 void
  41 Key_item::set_c_position (int c0)
  42 {
  43   c0_position_ = c0;
  44 }
  45
  46
  47 void
  48 Key_item::add (int p, int a)
  49 {
  50   pitch_arr_.push (p);
  51   acc_arr_.push (a);
  52 }
  53
  54 void
  55 Key_item::add_old (int p, int a)
  56 {
  57   old_pitch_arr_.push (p);
  58   old_acc_arr_.push (a);
  59 }
  60
  61
  62 int
  63 Key_item::calculate_position(int p, int a) const
  64 {
  65   if (multi_octave_b_)
  66     {
  67       return p + c0_position_;
  68     }
  69   else {
  70     if ((a<0 && ((p>FLAT_TOP_PITCH) || (p+get_c_position ()>4)) && (p+get_c_position ()>1))
  71         ||
  72         (a>0 && ((p>SHARP_TOP_PITCH) || (p+get_c_position ()>5)) && (p+get_c_position ()>2)))
  73       {
  74         p -= 7; /* Typeset below c_position */
  75       }
  76     return p + get_c_position ();
  77   }
  78 }
  79
  80 /*
  81   TODO
  82   - space the `natural' signs wider
  83   - dehair this
  84  */
  85 Molecule*
  86 Key_item::do_brew_molecule_p() const
  87 {
  88   Molecule*output = new Molecule;
  89   Real inter = staff_line_leading_f ()/2.0;
  90
  91   int j;
  92   if ((break_status_dir () == LEFT || break_status_dir () == CENTER)
  93       || old_pitch_arr_.size ())
  94     {
  95       for (int i =0; i < old_pitch_arr_.size(); i++)
  96         {
  97           for (j =0; (j < pitch_arr_.size())
  98                  && (old_pitch_arr_[i] != pitch_arr_[j]); j++)
  99             ;
 100
 101           if (j == pitch_arr_.size()
 102               || (old_pitch_arr_[i] == pitch_arr_[j]
 103                   && old_acc_arr_[i] != acc_arr_[j]))
 104             {
 105               Molecule m =lookup_l ()->accidental (0,false);
 106               m.translate_axis (calculate_position(old_pitch_arr_[i], old_acc_arr_[i]) * inter, Y_AXIS);
 107               output->add_at_edge (X_AXIS, RIGHT, m,0);
 108             }
 109         }
 110
 111       /*
 112         Add half a space between  cancellation and key sig.
 113
 114         As suggested by [Ross], p.148.
 115        */
 116       Interval x(0, inter);
 117       Interval y(0,0);
 118
 119       output->add_at_edge (X_AXIS, RIGHT, lookup_l()->fill (Box(x,y)),0);
 120     }
 121
 122   for (int i =0; i < pitch_arr_.size(); i++)
 123     {
 124       Molecule m =lookup_l ()->accidental (acc_arr_[i],false);
 125       m.translate_axis (calculate_position(pitch_arr_[i], acc_arr_[i]) * inter, Y_AXIS);
 126       output->add_at_edge (X_AXIS, RIGHT, m, 0);
 127     }
 128
 129   return output;
 130 }
 131
 132
 133