lily/tex-slur.cc

   1 /*
   2   tex-slur.cc -- implement Lookup::*slur
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 1996,1997 Han-Wen Nienhuys <hanwen@stack.nl>
   7 */
   8
   9 #include <math.h>
  10 #include "misc.hh"
  11 #include "lookup.hh"
  12 #include "molecule.hh"
  13 #include "dimen.hh"
  14 #include "debug.hh"
  15 #include "paper-def.hh"
  16
  17
  18 static char
  19 direction_char (Direction y_sign)
  20 {
  21   char c='#';
  22   switch (y_sign)
  23     {
  24     case DOWN:
  25       c = 'd';
  26       break;
  27     case CENTER:
  28       c = 'h';
  29       break;
  30     case UP:
  31       c = 'u';
  32       break;
  33     default:
  34       assert (false);
  35     }
  36   return c;
  37 }
  38
  39 Atom
  40 Lookup::half_slur_middlepart (Real &dx, Direction dir) const
  41 {
  42   // todo
  43   if (dx >= 400 PT)
  44     {
  45       WARN<<"halfslur too large" <<print_dimen (dx)<< "shrinking (ugh)\n";
  46       dx = 400 PT;
  47     }
  48   int widx = int (floor (dx / 4.0));
  49   dx = widx * 4.0;
  50   if (widx) widx --;
  51   else
  52     {
  53       WARN <<  "slur too narrow\n";
  54     }
  55
  56   Atom s;
  57
  58   s.dim_.y() = Interval (min (0,0), max (0,0)); // todo
  59   s.dim_.x() = Interval (0,dx);
  60
  61   String f =  String ("\\hslurchar");
  62   f += direction_char (CENTER);
  63
  64   int idx = widx;
  65   if (dir < 0)
  66     idx += 128;
  67
  68   assert (idx < 256);
  69
  70   f +=String ("{") + String (idx) + "}";
  71   s.tex_ = f;
  72   s.translate (dx/2, X_AXIS);
  73
  74   return s;
  75 }
  76
  77 Atom
  78 Lookup::half_slur (int dy, Real &dx, Direction dir, int xpart) const
  79 {
  80   Real orig_dx = dx;
  81   if (!xpart)
  82     return half_slur_middlepart (dx, dir);
  83
  84   int widx;
  85
  86   if (dx >= 96 PT)
  87     {
  88       WARN << "Slur half too wide." << print_dimen (orig_dx) << " shrinking (ugh)\n";
  89       dx =  96 PT;
  90     }
  91
  92   widx = int (rint (dx/12.0));
  93   dx = widx*12.0;
  94   if (widx)
  95     widx --;
  96   else
  97     {
  98       WARN <<  "slur too narrow " << print_dimen (orig_dx)<<"\n";
  99     }
 100
 101   Atom s;
 102   s.dim_.x() = Interval (0,dx);
 103   s.dim_.y() = Interval (min (0,dy), max (0,dy));
 104
 105
 106   String f = String ("\\hslurchar");
 107
 108   f+= direction_char (dir);
 109
 110   int hidx = dy;
 111   if (hidx <0)
 112     hidx = -hidx;
 113   hidx --;
 114   int idx =-1;
 115
 116   idx = widx * 16 + hidx;
 117   if (xpart < 0)
 118     idx += 128;
 119
 120   assert (idx < 256);
 121   f+=String ("{") + String (idx) + "}";
 122
 123
 124   s.tex_ = f;
 125
 126   return s;
 127 }
 128
 129 Atom
 130 Lookup::slur (int dy , Real &dx, Direction dir) const
 131 {
 132
 133   assert (abs (dir) <= 1);
 134   if  (dx < 0)
 135     {
 136       warning ("Negative slur/tie length: " + print_dimen (dx));
 137       dx = 4.0 PT;
 138     }
 139   Direction y_sign = (Direction) sign (dy);
 140
 141   bool large = abs (dy) > 8;
 142
 143   if (y_sign)
 144     {
 145       large |= dx>= 4*16 PT;
 146     }
 147   else
 148     large |= dx>= 4*54 PT;
 149
 150   if (large)
 151     {
 152       return big_slur (dy, dx, dir);
 153     }
 154   Real orig_dx = dx;
 155   int widx = int (floor (dx/4.0)); // slurs better too small..
 156   dx = 4.0 * widx;
 157   if (widx)
 158     widx --;
 159   else
 160     {
 161       WARN <<  "slur too narrow: " << print_dimen (orig_dx) << "\n";
 162     }
 163
 164   int hidx = dy;
 165   if (hidx <0)
 166     hidx = -hidx;
 167   hidx --;
 168   if (hidx > 8)
 169     {
 170       WARN<<"slur to steep: " << dy << " shrinking (ugh)\n";
 171     }
 172
 173   Atom s;
 174   s.dim_.x() = Interval (-dx/2,dx/2);
 175   s.dim_.y() = Interval (min (0,dy), max (0,dy));
 176
 177   String f = String ("\\slurchar") + String (direction_char (y_sign));
 178
 179   int idx=-1;
 180   if (y_sign) {
 181     idx = hidx * 16 + widx;
 182     if (dir < 0)
 183       idx += 128;
 184   }
 185   else
 186     {
 187       if (dx >= 4*54 PT)
 188         {
 189           WARN << "slur too wide: " << print_dimen (dx) <<
 190             " shrinking (ugh)\n";
 191           dx = 4*54 PT;
 192         }
 193       idx = widx;
 194       if (dir < 0)
 195         idx += 54;
 196     }
 197
 198   assert (idx < 256);
 199   f+=String ("{") + String (idx) + "}";
 200   s.tex_ = f;
 201
 202
 203   s.translate (dx/2, X_AXIS);
 204   return s;
 205 }
 206
 207 Atom
 208 Lookup::big_slur (int dy , Real &dx, Direction dir) const
 209 {
 210   if (dx < 24 PT)
 211     {
 212       warning ("big_slur too small " + print_dimen (dx) + " (stretching)");
 213       dx = 24 PT;
 214     }
 215
 216   Real slur_extra =abs (dy)  /2.0 + 2;
 217   int l_dy = int (Real (dy)/2 + slur_extra*dir);
 218   int r_dy =  dy - l_dy;
 219
 220   Real internote_f = paper_l_->internote_f();
 221   Real left_wid = dx/4.0;
 222   Real right_wid = left_wid;
 223
 224   Atom l = half_slur (l_dy, left_wid, dir, -1);
 225   Atom r = half_slur (r_dy, right_wid, dir, 1);
 226   Real mid_wid = dx - left_wid - right_wid;
 227
 228   Molecule mol;
 229   mol.add (l);
 230   Atom a (half_slur (0, mid_wid, dir, 0));
 231   a.translate (slur_extra * internote_f, Y_AXIS);
 232   mol.add_at_edge (X_AXIS, RIGHT, a);
 233   mol.add_at_edge (X_AXIS, RIGHT, r);
 234   mol.translate (l_dy * internote_f, Y_AXIS);
 235
 236   Atom s;
 237   s.tex_ = mol.TeX_string();
 238   s.dim_ = mol.extent();
 239   return s;
 240 }
 241
 242