2 stem.cc -- implement Stem
4 source file of the GNU LilyPond music typesetter
6 (c) 1996, 1997--1998 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"
23 const int STEMLEN = 7;
25 IMPLEMENT_IS_TYPE_B1 (Stem,Item);
37 yextent_drul_[DOWN] = yextent_drul_[UP] = 0;
41 dir_forced_b_ = false;
49 Stem::head_positions () const
52 for (int i =0; i < head_l_arr_.size (); i++)
54 int p = head_l_arr_[i]->position_i_;
55 r[BIGGER] = r[BIGGER] >? p;
56 r[SMALLER] = r[SMALLER] <? p;
62 Stem::do_print () const
65 DOUT << "flag "<< flag_i_ ;
72 Stem::stem_length_f () const
74 return yextent_drul_[UP]-yextent_drul_[DOWN] ;
78 Stem::stem_begin_f () const
80 return yextent_drul_[Direction(-dir_)];
84 Stem::chord_start_f () const
86 return head_positions()[dir_] * paper ()->internote_f ();
90 Stem::stem_end_f () const
92 return yextent_drul_[dir_];
96 Stem::set_stemend (Real se)
99 if (dir_ && dir_ * head_positions()[dir_] >= se*dir_)
100 warning (_("Weird stem size; check for narrow beams"));
103 yextent_drul_[dir_] = se;
104 yextent_drul_[Direction(-dir_)] = head_positions()[-dir_];
108 Stem::type_i () const
110 return head_l_arr_[0]->balltype_i_;
114 Stem::add (Rhythmic_head *n)
116 n->add_dependency (this); // ?
117 if (n->is_type_b (Note_head::static_name ()))
119 head_l_arr_.push ((Note_head*)n);
121 else if (n->is_type_b (Rest::static_name ()))
123 rest_l_arr_.push ((Rest*)n);
128 Stem::invisible_b () const
130 return (!head_l_arr_.size () ||
131 head_l_arr_[0]->balltype_i_ <= 0);
135 Stem::get_center_distance (Direction d)
137 int staff_center = 0;
138 int distance = d*(head_positions()[d] - staff_center);
139 return distance >? 0;
143 Stem::get_default_dir ()
145 return (get_center_distance (UP) >
146 get_center_distance (DOWN))
158 Stem::set_default_dir ()
160 dir_ = get_default_dir ();
164 Stem::set_default_stemlen ()
167 Real dy = paper ()->interbeam_f (mult_i_);
172 /* If the stem points in the "wrong" direction, it should be
173 shortened, according to [Roush & Gourlay]. Their suggestion to knock off
174 a whole staffspace is a bit drastical though.
176 else if (dir_ != get_default_dir ())
184 set_stemend ((dir_ > 0) ? head_positions()[BIGGER] + len :
185 head_positions()[SMALLER] - len);
188 if (dir_ * stem_end_f () < 0)
195 Stem::set_default_extents ()
197 if (!stem_length_f ())
198 set_default_stemlen ();
210 move into note_column.cc
214 Stem::set_noteheads ()
216 if (!head_l_arr_.size ())
218 head_l_arr_.sort (Note_head::compare);
220 head_l_arr_.reverse ();
222 head_l_arr_[0]->extremal_i_ = -1;
223 head_l_arr_.top ()->extremal_i_ = 1;
225 int lastpos = head_l_arr_[0]->position_i_;
226 for (int i=1; i < head_l_arr_.size (); i ++)
228 int dy =abs (lastpos- head_l_arr_[i]->position_i_);
233 head_l_arr_[i]->x_dir_ = (stem_xdir_ == LEFT) ? LEFT : RIGHT;
238 lastpos = head_l_arr_[i]->position_i_;
243 Stem::do_pre_processing ()
245 if (yextent_drul_[DOWN]== yextent_drul_[UP])
246 set_default_extents ();
249 transparent_b_ = invisible_b ();
250 set_empty (invisible_b ());
255 Stem::do_width () const
258 if (beam_l_ || abs (flag_i_) <= 2)
262 Paper_def*p= paper ();
263 r = p->lookup_l ()->flag (flag_i_, dir_).dim_.x ();
264 r += note_delta_f ();
272 const Real ANGLE = 20* (2.0*M_PI/360.0); // ugh!
275 Stem::brew_molecule_p () const
277 Molecule *mol_p =new Molecule;
278 Paper_def *p =paper ();
279 Drul_array<Real> stem_y = yextent_drul_;
280 Real dy = p->internote_f ();
284 if (head_l_arr_.size ())
285 head_wid = head_l_arr_[0]->width ().length ();
286 stem_y[Direction(-dir_)] += dir_ * head_wid * tan(ANGLE)/(2*dy);
290 Atom ss =p->lookup_l ()->stem (stem_y[DOWN]*dy,
292 mol_p->add (Atom (ss));
295 if (!beam_l_ &&abs (flag_i_) > 2)
297 Atom fl = p->lookup_l ()->flag (flag_i_, dir_);
298 fl.translate_axis(stem_y[dir_]*dy, Y_AXIS);
302 if (head_l_arr_.size())
304 mol_p->translate_axis (note_delta_f (), X_AXIS);
310 Stem::note_delta_f () const
313 if (head_l_arr_.size())
315 Interval head_wid(0, head_l_arr_[0]->width ().length ());
316 Real rule_thick(paper ()->rule_thickness ());
317 Interval stem_wid(-rule_thick/2, rule_thick/2);
318 if (stem_xdir_ == CENTER)
319 r = head_wid.center ();
321 r = head_wid[stem_xdir_] - stem_wid[stem_xdir_];
327 Stem::hpos_f () const
329 return note_delta_f () + Item::hpos_f ();
333 TODO: head_l_arr_/rest_l_arr_ in do_substitute_dependent ()
336 Stem::do_substitute_dependency (Score_elem*o,Score_elem*n)
338 Item * o_l = o->item ();
339 Item * n_l = n? n->item () : 0;
340 head_l_arr_.substitute ((Note_head*)o_l, (Note_head*)n_l);
341 rest_l_arr_.substitute ((Rest*)o_l, (Rest*)n_l);