lily/stem.cc

   1 /*
   2   stem.cc -- implement Stem
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 1996,1997 Han-Wen Nienhuys <hanwen@stack.nl>
   7
   8   TODO: This is way too hairy
   9 */
  10
  11 #include "stem.hh"
  12 #include "dimen.hh"
  13 #include "debug.hh"
  14 #include "paper-def.hh"
  15 #include "note-head.hh"
  16 #include "lookup.hh"
  17 #include "molecule.hh"
  18 #include "p-col.hh"
  19 #include "misc.hh"
  20 #include "beam.hh"
  21 #include "rest.hh"
  22
  23 const int STEMLEN = 7;
  24
  25 IMPLEMENT_IS_TYPE_B1 (Stem,Item);
  26
  27 Stem::Stem ()
  28 {
  29   /*
  30     TODO: staff-size
  31     */
  32   beam_l_ = 0;
  33   beams_left_i_ = 0;
  34   beams_right_i_ = 0;
  35
  36   yextent_drul_[DOWN] = yextent_drul_[UP] = 0;
  37   flag_i_ = 2;
  38   dir_ = CENTER;
  39   stem_xdir_ = LEFT;
  40   staff_size_i_ = 8;
  41
  42   beam_gap_i_ = 0;
  43 }
  44
  45 Interval_t<int>
  46 Stem::head_positions () const
  47 {
  48   Interval_t<int> r;
  49   for (int i =0; i < head_l_arr_.size (); i++)
  50     {
  51       int p = head_l_arr_[i]->position_i_;
  52       r[BIGGER] = r[BIGGER] >? p;
  53       r[SMALLER] = r[SMALLER] <? p;
  54     }
  55   return r;
  56 }
  57
  58 void
  59 Stem::do_print () const
  60 {
  61 #ifndef NPRINT
  62   DOUT << "flag "<< flag_i_ ;
  63   if (beam_l_)
  64     DOUT << "beamed";
  65 #endif
  66 }
  67
  68 Real
  69 Stem::stem_length_f () const
  70 {
  71   return yextent_drul_[UP]-yextent_drul_[DOWN] ;
  72 }
  73
  74 Real
  75 Stem::stem_begin_f () const
  76 {
  77   return yextent_drul_[Direction(-dir_)];
  78 }
  79
  80 Real
  81 Stem::chord_start_f () const
  82 {
  83   return head_positions()[dir_] * paper ()->internote_f ();
  84 }
  85
  86 Real
  87 Stem::stem_end_f () const
  88 {
  89   return yextent_drul_[dir_];
  90 }
  91
  92 void
  93 Stem::set_stemend (Real se)
  94 {
  95   // todo: margins
  96   if (dir_ && dir_ * head_positions()[dir_] >= se*dir_)
  97     warning (_("Weird stem size; check for narrow beams"));
  98
  99
 100   yextent_drul_[dir_]  =  se;
 101   yextent_drul_[Direction(-dir_)] = head_positions()[-dir_];
 102 }
 103
 104 int
 105 Stem::type_i () const
 106 {
 107   return head_l_arr_[0]->balltype_i_;
 108 }
 109
 110 void
 111 Stem::add (Rhythmic_head *n)
 112 {
 113   n->add_dependency (this);     // ?
 114   if (n->is_type_b (Note_head::static_name ()))
 115     {
 116       head_l_arr_.push ((Note_head*)n);
 117     }
 118   else if (n->is_type_b (Rest::static_name ()))
 119     {
 120       rest_l_arr_.push ((Rest*)n);
 121     }
 122 }
 123
 124 bool
 125 Stem::invisible_b () const
 126 {
 127   return (!head_l_arr_.size () ||
 128     head_l_arr_[0]->balltype_i_ <= 0);
 129 }
 130
 131 int
 132 Stem::get_center_distance (Direction d)
 133 {
 134   int staff_center = 0;
 135   int distance = d*(head_positions()[d] - staff_center);
 136   return distance >? 0;
 137 }
 138
 139 Direction
 140 Stem::get_default_dir ()
 141 {
 142   return (get_center_distance (UP) >
 143           get_center_distance (DOWN))
 144     ? DOWN
 145     : UP;
 146 }
 147
 148 Direction
 149 Stem::get_dir ()
 150 {
 151   return dir_;
 152 }
 153
 154 void
 155 Stem::set_default_dir ()
 156 {
 157   dir_ = get_default_dir ();
 158 }
 159
 160 void
 161 Stem::set_default_stemlen ()
 162 {
 163   Real len = STEMLEN;
 164   Real dy = paper ()->interbeam_f ();
 165
 166   if (!dir_)
 167     set_default_dir ();
 168
 169   /* If the stem points in the "wrong" direction, it should be
 170      shortened, according to [Roush & Gourlay].  Their suggestion to knock off
 171      a whole staffspace is a bit drastical though.
 172      */
 173   else if (dir_ != get_default_dir ())
 174     len  -= 1.0;
 175
 176   if (flag_i_ >= 5)
 177     len += 2.0;
 178   if (flag_i_ >= 6)
 179     len += 1.0;
 180
 181   set_stemend ((dir_ > 0) ? head_positions()[BIGGER] + len :
 182                head_positions()[SMALLER] - len);
 183
 184
 185   if (dir_ * stem_end_f () < 0)
 186     {
 187       set_stemend (0);
 188     }
 189 }
 190
 191 void
 192 Stem::set_default_extents ()
 193 {
 194   if (!stem_length_f ())
 195     set_default_stemlen ();
 196
 197
 198   if (dir_ == UP)
 199     stem_xdir_ = RIGHT;
 200   if (invisible_b ())
 201     stem_xdir_ = CENTER;
 202 }
 203
 204 /*
 205   TODO
 206
 207   move into note_column.cc
 208
 209   */
 210 void
 211 Stem::set_noteheads ()
 212 {
 213   if (!head_l_arr_.size ())
 214     return;
 215   head_l_arr_.sort (Note_head::compare);
 216   if (dir_ < 0)
 217     head_l_arr_.reverse ();
 218
 219   head_l_arr_[0]->extremal_i_ = -1;
 220   head_l_arr_.top ()->extremal_i_ = 1;
 221   int parity=1;
 222   int lastpos = head_l_arr_[0]->position_i_;
 223   for (int i=1; i < head_l_arr_.size (); i ++)
 224     {
 225       int dy =abs (lastpos- head_l_arr_[i]->position_i_);
 226
 227       if (dy <= 1)
 228         {
 229           if (parity)
 230             head_l_arr_[i]->x_dir_ = (stem_xdir_ == LEFT) ? LEFT : RIGHT;
 231           parity = !parity;
 232         }
 233       else
 234         parity = 1;
 235       lastpos = head_l_arr_[i]->position_i_;
 236     }
 237 }
 238
 239 void
 240 Stem::do_pre_processing ()
 241 {
 242   if (yextent_drul_[DOWN]== yextent_drul_[UP])
 243     set_default_extents ();
 244   set_noteheads ();
 245   flag_i_ = flag_i_;
 246   transparent_b_ = invisible_b ();
 247   set_empty (invisible_b ());
 248 }
 249
 250
 251 Interval
 252 Stem::do_width () const
 253 {
 254   Interval r (0, 0);
 255   if (beam_l_ || abs (flag_i_) <= 2)
 256     ;   // TODO!
 257   else
 258     {
 259       Paper_def*p= paper ();
 260       r = p->lookup_l ()->flag (flag_i_, dir_).dim_.x ();
 261       r += note_delta_f ();
 262     }
 263   return r;
 264 }
 265
 266
 267
 268
 269 const Real ANGLE = 20* (2.0*M_PI/360.0); // ugh!
 270
 271 Molecule*
 272 Stem::brew_molecule_p () const
 273 {
 274   Molecule *mol_p =new Molecule;
 275   Paper_def *p =paper ();
 276   Drul_array<Real> stem_y = yextent_drul_;
 277   Real dy = p->internote_f ();
 278
 279
 280   Real head_wid = 0;
 281   if (head_l_arr_.size ())
 282     head_wid = head_l_arr_[0]->width ().length ();
 283   stem_y[Direction(-dir_)] += dir_ * head_wid * tan(ANGLE)/(2*dy);
 284
 285   if (!invisible_b ())
 286     {
 287       Atom ss =p->lookup_l ()->stem (stem_y[DOWN]*dy,
 288                                      stem_y[UP]*dy);
 289       mol_p->add (Atom (ss));
 290     }
 291
 292   if (!beam_l_ &&abs (flag_i_) > 2)
 293     {
 294       Atom fl = p->lookup_l ()->flag (flag_i_, dir_);
 295       fl.translate_axis(stem_y[dir_]*dy, Y_AXIS);
 296       mol_p->add(fl);
 297     }
 298
 299   if (head_l_arr_.size())
 300     {
 301       mol_p->translate_axis (note_delta_f (), X_AXIS);
 302     }
 303   return mol_p;
 304 }
 305
 306 Real
 307 Stem::note_delta_f () const
 308 {
 309   Real r=0;
 310   if (head_l_arr_.size() && stem_xdir_ != CENTER)
 311     {
 312       Interval head_wid(0,  head_l_arr_[0]->width ().length ());
 313       Real rule_thick(paper ()->rule_thickness ());
 314       Interval stem_wid(-rule_thick/2, rule_thick/2);
 315       r = head_wid[stem_xdir_] - stem_wid[stem_xdir_];
 316     }
 317   return r;
 318 }
 319 Real
 320 Stem::hpos_f () const
 321 {
 322   return note_delta_f () +Item::hpos_f ();
 323 }
 324
 325 /*
 326   TODO:  head_l_arr_/rest_l_arr_ in  do_substitute_dependent ()
 327  */
 328 void
 329  Stem::do_substitute_dependency (Score_elem*o,Score_elem*n)
 330 {
 331   Item * o_l = o->item ();
 332   Item * n_l = n? n->item () : 0;
 333   head_l_arr_.substitute ((Note_head*)o_l, (Note_head*)n_l);
 334   rest_l_arr_.substitute ((Rest*)o_l, (Rest*)n_l);
 335 }