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 (Rhythmic_head *n)
115 n->add_dependency (this); // ?
116 if (n->is_type_b (Note_head::static_name ()))
118 head_l_arr_.push ((Note_head*)n);
120 else if (n->is_type_b (Rest::static_name ()))
122 rest_l_arr_.push ((Rest*)n);
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 = 0;
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 = 0;
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 ()
183 Real dy = paper ()->interbeam_f ();
185 // ugh, should get nice *rule* for this
186 if (abbrev_flag_i_ > 1)
187 len += (abbrev_flag_i_ - 1)* dy / 2;
188 set_stemend ((dir_ > 0) ? max_head_i () + len :
189 min_head_i () - len);
192 if (dir_ * stem_end_f () < 0)
201 Stem::set_default_extents ()
203 if (!stem_length_f ())
204 set_default_stemlen ();
206 set_stemend ((dir_< 0) ?
207 max_head_i ()-stem_length_f (): min_head_i () + stem_length_f ());
218 move into note_column.cc
222 Stem::set_noteheads ()
224 if (!head_l_arr_.size ())
226 head_l_arr_.sort (Note_head::compare);
228 head_l_arr_.reverse ();
230 head_l_arr_[0]->extremal_i_ = -1;
231 head_l_arr_.top ()->extremal_i_ = 1;
233 int lastpos = head_l_arr_[0]->position_i_;
234 for (int i=1; i < head_l_arr_.size (); i ++)
236 int dy =abs (lastpos- head_l_arr_[i]->position_i_);
241 head_l_arr_[i]->x_dir_ = (stem_xdir_ == LEFT) ? LEFT : RIGHT;
246 lastpos = head_l_arr_[i]->position_i_;
251 Stem::do_pre_processing ()
253 if (yextent_drul_[DOWN]== yextent_drul_[UP])
254 set_default_extents ();
257 transparent_b_ = invisible_b ();
258 set_empty (invisible_b ());
263 Stem::do_width () const
268 r = abbrev_mol ().extent ().x ();
270 else if (beam_l_ || abs (flag_i_) <= 2)
274 Paper_def*p= paper ();
275 r = p->lookup_l ()->flag (flag_i_, dir_).dim_.x ();
276 r += note_delta_f ();
284 Stem::abbrev_mol () const
286 Real dy = paper ()->interbeam_f ();
287 Real w = 1.5 * paper ()->lookup_l ()->ball (2).dim_.x ().length ();
288 Real beamdy = paper ()->interline_f () / 2;
291 Real slope = paper ()->internote_f () / 4;
295 slope = 2 * beam_l_->slope;
296 // ugh, rather calc from Abbreviation_req
297 beams_i = beams_right_i_ >? beams_left_i_;
299 paper ()->lookup_l ()->beam (slope, 20 PT);
302 Atom a (paper ()->lookup_l ()->beam (slope, w));
303 a.translate (Offset(- w / 2, stem_end_f () - (w / 2 * slope)));
306 a.translate_axis (dy + beamdy - dir_ * dy, Y_AXIS);
308 a.translate_axis (2 * beamdy - dir_ * (beamdy - dy), Y_AXIS);
310 for (int i = 0; i < abbrev_flag_i_; i++)
313 b.translate_axis (-dir_ * dy * (beams_i + i), Y_AXIS);
321 Stem::brew_molecule_p () const
323 Molecule *mol_p =new Molecule;
325 Real bot = yextent_drul_[DOWN];
326 Real top = yextent_drul_[UP];
330 Paper_def *p =paper ();
332 Real dy = p->internote_f ();
335 Atom ss =p->lookup_l ()->stem (bot*dy,top*dy);
336 mol_p->add (Atom (ss));
339 if (!beam_l_ &&abs (flag_i_) > 2)
341 Atom fl = p->lookup_l ()->flag (flag_i_, dir_);
342 mol_p->add_at_edge (Y_AXIS, dir_, Molecule (Atom (fl)));
343 assert (!abbrev_flag_i_);
347 mol_p->add (abbrev_mol ());
349 if (head_l_arr_.size())
351 mol_p->translate_axis (note_delta_f (), X_AXIS);
357 Stem::note_delta_f () const
360 if (head_l_arr_.size())
362 Interval head_wid(0, head_l_arr_[0]->width ().length ());
363 Real rule_thick(paper ()->rule_thickness ());
364 Interval stem_wid(-rule_thick/2, rule_thick/2);
365 r = head_wid[stem_xdir_] - stem_wid[stem_xdir_];
370 Stem::hpos_f () const
372 return note_delta_f () +Item::hpos_f ();
376 TODO: head_l_arr_/rest_l_arr_ in do_substitute_dependent ()
379 Stem::do_substitute_dependency (Score_elem*o,Score_elem*n)
381 Item * o_l = o->item ();
382 Item * n_l = n? n->item () : 0;
383 head_l_arr_.substitute ((Note_head*)o_l, (Note_head*)n_l);
384 rest_l_arr_.substitute ((Rest*)o_l, (Rest*)n_l);