lily/stem.cc

   1 /*
   2   stem.cc -- implement Stem
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 1996, 1997--1998 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   7
   8   TODO: This is way too hairy
   9 */
  10
  11 #include "stem.hh"
  12 #include "debug.hh"
  13 #include "paper-def.hh"
  14 #include "note-head.hh"
  15 #include "lookup.hh"
  16 #include "molecule.hh"
  17 #include "p-col.hh"
  18 #include "misc.hh"
  19 #include "beam.hh"
  20 #include "rest.hh"
  21
  22
  23
  24
  25 Stem::~Stem ()
  26 {
  27 }
  28 Stem::Stem ()
  29 {
  30   /*
  31     TODO: staff-size
  32     */
  33   beam_l_ = 0;
  34   beams_left_i_ = 0;
  35   beams_right_i_ = 0;
  36   mult_i_ = 0;
  37
  38   yextent_drul_[DOWN] = yextent_drul_[UP] = 0;
  39   flag_i_ = 2;
  40   dir_ = CENTER;
  41   beam_dir_ = CENTER;
  42   dir_forced_b_ = false;
  43   stem_xdir_ = LEFT;
  44   staff_size_i_ = 8;
  45
  46   beam_gap_i_ = 0;
  47 }
  48
  49 Interval_t<int>
  50 Stem::head_positions () const
  51 {
  52   Interval_t<int> r;
  53   for (int i =0; i < head_l_arr_.size (); i++)
  54     {
  55       int p = head_l_arr_[i]->position_i_;
  56       r[BIGGER] = r[BIGGER] >? p;
  57       r[SMALLER] = r[SMALLER] <? p;
  58     }
  59   return r;
  60 }
  61
  62 void
  63 Stem::do_print () const
  64 {
  65 #ifndef NPRINT
  66   DOUT << "flag "<< flag_i_;
  67   if (beam_l_)
  68     DOUT << "beamed";
  69 #endif
  70 }
  71
  72 Real
  73 Stem::stem_length_f () const
  74 {
  75   return yextent_drul_[UP]-yextent_drul_[DOWN] ;
  76 }
  77
  78 Real
  79 Stem::stem_begin_f () const
  80 {
  81   return yextent_drul_[Direction(-dir_)];
  82 }
  83
  84 Real
  85 Stem::chord_start_f () const
  86 {
  87   return head_positions()[dir_] * paper ()->internote_f ();
  88 }
  89
  90 Real
  91 Stem::stem_end_f () const
  92 {
  93   return yextent_drul_[dir_];
  94 }
  95
  96 void
  97 Stem::set_stemend (Real se)
  98 {
  99   // todo: margins
 100   if (dir_ && dir_ * head_positions()[dir_] >= se*dir_)
 101     warning (_ ("weird stem size; check for narrow beams"));
 102
 103
 104   yextent_drul_[dir_]  =  se;
 105   yextent_drul_[Direction(-dir_)] = head_positions()[-dir_];
 106 }
 107
 108 int
 109 Stem::type_i () const
 110 {
 111   return head_l_arr_[0]->balltype_i_;
 112 }
 113
 114 void
 115 Stem::add_head (Rhythmic_head *n)
 116 {
 117   n->add_dependency (this);     // ?
 118   if (dynamic_cast<Note_head *> (n))
 119     {
 120       head_l_arr_.push ((Note_head*)n);
 121     }
 122   else if (dynamic_cast<Rest *> (n))
 123     {
 124       rest_l_arr_.push ((Rest*)n);
 125     }
 126 }
 127
 128 bool
 129 Stem::invisible_b () const
 130 {
 131   return (!head_l_arr_.size () ||
 132     head_l_arr_[0]->balltype_i_ <= 0);
 133 }
 134
 135 int
 136 Stem::get_center_distance (Direction d) const
 137 {
 138   int staff_center = 0;
 139   int distance = d*(head_positions()[d] - staff_center);
 140   return distance >? 0;
 141 }
 142
 143 Direction
 144 Stem::get_default_dir () const
 145 {
 146   return (get_center_distance (UP) >
 147           get_center_distance (DOWN))
 148     ? DOWN
 149     : UP;
 150 }
 151
 152 Direction
 153 Stem::get_dir () const
 154 {
 155   return dir_;
 156 }
 157
 158 void
 159 Stem::set_default_dir ()
 160 {
 161   dir_ = get_default_dir ();
 162 }
 163
 164 void
 165 Stem::set_default_stemlen ()
 166 {
 167   /*
 168    TODO
 169    urg; this should be handled by Stem_info
 170    */
 171
 172   Real length_f = paper ()->get_var ("stem_length");
 173   Real shorten_f = paper ()->get_var ("forced_stem_shorten");
 174
 175   Real internote_f = paper ()->internote_f ();
 176   length_f /= internote_f;
 177   shorten_f /= internote_f;
 178
 179   Real len = length_f;
 180   if (!dir_)
 181     set_default_dir ();
 182   /*
 183     stems in unnatural (forced) direction should be shortened,
 184     accoding to [Roush & Gourlay]
 185    */
 186   else if (dir_ != get_default_dir ())
 187     len -= shorten_f / internote_f;
 188
 189   if (flag_i_ >= 5)
 190     len += 2.0;
 191   if (flag_i_ >= 6)
 192     len += 1.0;
 193
 194   set_stemend ((dir_ > 0) ? head_positions()[BIGGER] + len :
 195                head_positions()[SMALLER] - len);
 196
 197   if (dir_ * stem_end_f () < 0)
 198     {
 199       set_stemend (0);
 200     }
 201 }
 202 //xxx
 203 void
 204 Stem::set_default_extents ()
 205 {
 206   if (!stem_length_f ())
 207     set_default_stemlen ();
 208
 209
 210   if (dir_ == UP)
 211     stem_xdir_ = RIGHT;
 212   if (invisible_b ())
 213     stem_xdir_ = CENTER;
 214 }
 215
 216 /*
 217   TODO
 218
 219   move into note_column.cc
 220
 221   */
 222 void
 223 Stem::set_noteheads ()
 224 {
 225   if (!head_l_arr_.size ())
 226     return;
 227   head_l_arr_.sort (Note_head::compare);
 228   if (dir_ < 0)
 229     head_l_arr_.reverse ();
 230
 231   head_l_arr_[0]->extremal_i_ = -1;
 232   head_l_arr_.top ()->extremal_i_ = 1;
 233   int parity=1;
 234   int lastpos = head_l_arr_[0]->position_i_;
 235   for (int i=1; i < head_l_arr_.size (); i ++)
 236     {
 237       int dy =abs (lastpos- head_l_arr_[i]->position_i_);
 238
 239       if (dy <= 1)
 240         {
 241           if (parity)
 242             head_l_arr_[i]->x_dir_ = (stem_xdir_ == LEFT) ? LEFT : RIGHT;
 243           parity = !parity;
 244         }
 245       else
 246         parity = 1;
 247       lastpos = head_l_arr_[i]->position_i_;
 248     }
 249 }
 250
 251 void
 252 Stem::do_pre_processing ()
 253 {
 254   if (yextent_drul_[DOWN]== yextent_drul_[UP])
 255     set_default_extents ();
 256   set_noteheads ();
 257   flag_i_ = flag_i_;
 258   transparent_b_ = invisible_b ();
 259   set_empty (invisible_b ());
 260 }
 261
 262
 263 Interval
 264 Stem::do_width () const
 265 {
 266   Interval r (0, 0);
 267   if (beam_l_ || abs (flag_i_) <= 2)
 268     ;   // TODO!
 269   else
 270     {
 271       r = lookup_l ()->flag (flag_i_, dir_).dim_.x ();
 272       r += note_delta_f ();
 273     }
 274   return r;
 275 }
 276
 277
 278
 279
 280 const Real ANGLE = 20* (2.0*M_PI/360.0); // ugh!
 281
 282 Molecule*
 283 Stem::brew_molecule_p () const
 284 {
 285   Molecule *mol_p =new Molecule;
 286   Drul_array<Real> stem_y = yextent_drul_;
 287   Real dy = paper ()->internote_f ();
 288
 289
 290   Real head_wid = 0;
 291   if (head_l_arr_.size ())
 292     head_wid = head_l_arr_[0]->width ().length ();
 293   stem_y[Direction(-dir_)] += dir_ * head_wid * tan(ANGLE)/(2*dy);
 294
 295   if (!invisible_b ())
 296     {
 297       Atom ss =lookup_l ()->stem (stem_y[DOWN]*dy,
 298                                      stem_y[UP]*dy);
 299       mol_p->add_atom (ss);
 300     }
 301
 302   if (!beam_l_ && abs (flag_i_) > 2)
 303     {
 304       Atom fl = lookup_l ()->flag (flag_i_, dir_);
 305       fl.translate_axis(stem_y[dir_]*dy, Y_AXIS);
 306       mol_p->add_atom (fl);
 307     }
 308
 309   if (head_l_arr_.size())
 310     {
 311       mol_p->translate_axis (note_delta_f (), X_AXIS);
 312     }
 313   return mol_p;
 314 }
 315
 316 Real
 317 Stem::note_delta_f () const
 318 {
 319   Real r=0;
 320   if (head_l_arr_.size())
 321     {
 322       Interval head_wid(0,  head_l_arr_[0]->width ().length ());
 323       Real rule_thick(paper ()->rule_thickness ());
 324       Interval stem_wid(-rule_thick/2, rule_thick/2);
 325       if (stem_xdir_ == CENTER)
 326 #define EGCS_ICE
 327 #ifndef EGCS_ICE
 328         r = head_wid.center ();
 329 #else
 330         r = (head_wid.min () + head_wid.max ()) / 2;
 331 #endif
 332       else
 333         r = head_wid[stem_xdir_] - stem_wid[stem_xdir_];
 334     }
 335   return r;
 336 }
 337
 338 Real
 339 Stem::hpos_f () const
 340 {
 341   return note_delta_f () + Item::hpos_f ();
 342 }
 343
 344 /*
 345   TODO:  head_l_arr_/rest_l_arr_ in  do_substitute_dependent ()
 346  */
 347 void
 348  Stem::do_substitute_dependency (Score_element*o,Score_element*n)
 349 {
 350   Item * o_l = dynamic_cast <Item *> (o);
 351   Item * n_l = n? dynamic_cast <Item *> (n) : 0;
 352   head_l_arr_.substitute ((Note_head*)o_l, (Note_head*)n_l);
 353   rest_l_arr_.substitute ((Rest*)o_l, (Rest*)n_l);
 354 }