2 stem.cc -- implement Stem
4 source file of the GNU LilyPond music typesetter
6 (c) 1996,1997 Han-Wen Nienhuys <hanwen@stack.nl>
8 TODO: This is way too hairy
14 #include "paper-def.hh"
15 #include "note-head.hh"
17 #include "molecule.hh"
25 IMPLEMENT_IS_TYPE_B1 (Stem,Item);
37 yextent_drul_[DOWN] = yextent_drul_[UP] = 0;
47 Stem::min_head_i () const
50 for (int i =0; i < head_l_arr_.size (); i++)
51 m = m <? head_l_arr_[i]->position_i_;
56 Stem::max_head_i () const
59 for (int i =0; i < head_l_arr_.size (); i++)
60 m = m >? head_l_arr_[i]->position_i_;
66 Stem::do_print () const
69 DOUT << "flag "<< flag_i_ << "abbrev_flag_i_" << abbrev_flag_i_;
76 Stem::stem_length_f () const
78 return yextent_drul_[UP]-yextent_drul_[DOWN] ;
82 Stem::stem_start_f () const
84 return (dir_ < 0)? yextent_drul_[UP] : yextent_drul_[DOWN];
88 Stem::stem_end_f () const
90 return (dir_ < 0)? yextent_drul_[DOWN] : yextent_drul_[UP];
95 Stem::set_stemend (Real se)
98 if (! ((dir_ > 0 && se >= max_head_i ()) ||
99 (se <= min_head_i () && dir_ <0)))
100 warning ("Weird stem size; check for narrow beams");
102 yextent_drul_[UP] = (dir_ < 0) ? max_head_i () : se;
103 yextent_drul_[DOWN] = (dir_ < 0) ? se : min_head_i ();
107 Stem::type_i () const
109 return head_l_arr_[0]->balltype_i_;
113 Stem::add (Note_head *n)
115 n->add_dependency (this);
116 head_l_arr_.push (n);
122 rest_l_arr_.push (r);
123 r->add_dependency (this); // ?
127 Stem::invisible_b () const
130 return (!head_l_arr_.size () ||
131 head_l_arr_[0]->balltype_i_ <= 0);
135 // if dir_ is set we return fake values.
137 Stem::get_center_distance_from_top ()
140 return (dir_ > 0) ? 0 : 1;
142 int staff_center = staff_size_i_ / 2;
143 int max = max_head_i () - staff_center;
147 // if dir_ is set we return fake values.
149 Stem::get_center_distance_from_bottom ()
152 return (dir_ > 0) ? 1 : 0;
154 int staff_center = staff_size_i_ / 2;
155 int min = staff_center - min_head_i ();
160 Stem::get_default_dir ()
164 return (get_center_distance_from_top () >=
165 get_center_distance_from_bottom ()) ?
166 (Direction)-1 : (Direction)1;
171 Stem::set_default_dir ()
173 dir_ = get_default_dir ();
177 Stem::set_default_stemlen ()
182 // ugh... how about non 5-line staffs?
183 bool on_ledger_line_b = ((max_head_i () < -2 && dir_ == 1)
184 // || (min_head_i () > staff_size_i_ && dir_ == -1));
185 || (min_head_i () > staff_size_i_ + 3 && dir_ == -1));
186 if (on_ledger_line_b)
188 set_stemend (staff_size_i_ / 2 - 1);
192 Real dy = paper ()->interbeam_f ();
194 // ugh, should get nice *rule* for this
195 if (abbrev_flag_i_ > 1)
196 len += (abbrev_flag_i_ - 1)* dy / 2;
197 set_stemend ((dir_ > 0) ? max_head_i () + len :
198 min_head_i () - len);
203 Stem::set_default_extents ()
205 if (!stem_length_f ())
206 set_default_stemlen ();
208 set_stemend ((dir_< 0) ?
209 max_head_i ()-stem_length_f (): min_head_i () + stem_length_f ());
213 if (head_l_arr_[0]->balltype_i_ <= 0)
220 move into note_column.cc
224 Stem::set_noteheads ()
226 if (!head_l_arr_.size ())
228 head_l_arr_.sort (Note_head::compare);
230 head_l_arr_.reverse ();
232 head_l_arr_[0]->extremal_i_ = -1;
233 head_l_arr_.top ()->extremal_i_ = 1;
235 int lastpos = head_l_arr_[0]->position_i_;
236 for (int i=1; i < head_l_arr_.size (); i ++)
238 int dy =abs (lastpos- head_l_arr_[i]->position_i_);
243 head_l_arr_[i]->x_dir_ = (stem_xdir_ == LEFT) ? LEFT : RIGHT;
248 lastpos = head_l_arr_[i]->position_i_;
253 Stem::do_pre_processing ()
255 if (yextent_drul_[DOWN]== yextent_drul_[UP])
256 set_default_extents ();
259 transparent_b_ = invisible_b ();
260 set_empty (invisible_b ());
265 Stem::do_width () const
270 r = abbrev_mol ().extent ().x ();
272 else if (beam_l_ || abs (flag_i_) <= 2)
276 Paper_def*p= paper ();
277 r = p->lookup_l ()->flag (flag_i_, dir_).dim_.x ();
278 r += note_delta_f ();
286 Stem::abbrev_mol () const
288 Real dy = paper ()->interbeam_f ();
289 Real w = 1.5 * paper ()->lookup_l ()->ball (2).dim_.x ().length ();
290 Real beamdy = paper ()->interline_f () / 2;
293 Real slope = paper ()->internote_f () / 4;
297 slope = 2 * beam_l_->slope;
298 // ugh, rather calc from Abbreviation_req
299 beams_i = beams_right_i_ >? beams_left_i_;
301 paper ()->lookup_l ()->beam (slope, 20 PT);
304 Atom a (paper ()->lookup_l ()->beam (slope, w));
305 a.translate (Offset(- w / 2, stem_end_f () - (w / 2 * slope)));
308 a.translate (dy + beamdy - dir_ * dy, Y_AXIS);
310 a.translate (2 * beamdy - dir_ * (beamdy - dy), Y_AXIS);
312 for (int i = 0; i < abbrev_flag_i_; i++)
315 b.translate (-dir_ * dy * (beams_i + i), Y_AXIS);
323 Stem::brew_molecule_p () const
325 Molecule *mol_p =new Molecule;
327 Real bot = yextent_drul_[DOWN];
328 Real top = yextent_drul_[UP];
332 Paper_def *p =paper ();
334 Real dy = p->internote_f ();
337 Atom ss =p->lookup_l ()->stem (bot*dy,top*dy);
338 mol_p->add (Atom (ss));
341 if (!beam_l_ &&abs (flag_i_) > 2)
343 Atom fl = p->lookup_l ()->flag (flag_i_, dir_);
344 mol_p->add_at_edge (Y_AXIS, dir_, Molecule (Atom (fl)));
345 assert (!abbrev_flag_i_);
349 mol_p->add (abbrev_mol ());
351 if (head_l_arr_.size())
353 mol_p->translate (note_delta_f (), X_AXIS);
359 Stem::note_delta_f () const
362 if (head_l_arr_.size())
364 r += head_l_arr_[0]->width ().length() * (stem_xdir_+1.0)/2.0;
365 if (stem_xdir_ == RIGHT)
366 r -= paper ()->rule_thickness ();
371 Stem::hpos_f () const
373 return note_delta_f () +Item::hpos_f ();
378 Stem::do_substitute_dependency (Score_elem*o,Score_elem*n)
380 Item * o_l = o->item ();
381 Item * n_l = n? n->item () : 0;
382 head_l_arr_.substitute ((Note_head*)o_l, (Note_head*)n_l);
383 rest_l_arr_.substitute ((Rest*)o_l, (Rest*)n_l);