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"
23 const int STEMLEN = 7;
25 IMPLEMENT_IS_TYPE_B1 (Stem,Item);
36 yextent_drul_[DOWN] = yextent_drul_[UP] = 0;
46 Stem::head_positions () const
49 for (int i =0; i < head_l_arr_.size (); i++)
51 int p = head_l_arr_[i]->position_i_;
52 r[BIGGER] = r[BIGGER] >? p;
53 r[SMALLER] = r[SMALLER] <? p;
59 Stem::do_print () const
62 DOUT << "flag "<< flag_i_ ;
69 Stem::stem_length_f () const
71 return yextent_drul_[UP]-yextent_drul_[DOWN] ;
75 Stem::stem_begin_f () const
77 return yextent_drul_[Direction(-dir_)];
81 Stem::chord_start_f () const
83 return head_positions()[dir_] * paper ()->internote_f ();
87 Stem::stem_end_f () const
89 return yextent_drul_[dir_];
93 Stem::set_stemend (Real se)
96 if (dir_ && dir_ * head_positions()[dir_] >= se*dir_)
97 warning (_("Weird stem size; check for narrow beams"));
100 yextent_drul_[dir_] = se;
101 yextent_drul_[Direction(-dir_)] = head_positions()[-dir_];
105 Stem::type_i () const
107 return head_l_arr_[0]->balltype_i_;
111 Stem::add (Rhythmic_head *n)
113 n->add_dependency (this); // ?
114 if (n->is_type_b (Note_head::static_name ()))
116 head_l_arr_.push ((Note_head*)n);
118 else if (n->is_type_b (Rest::static_name ()))
120 rest_l_arr_.push ((Rest*)n);
125 Stem::invisible_b () const
127 return (!head_l_arr_.size () ||
128 head_l_arr_[0]->balltype_i_ <= 0);
132 Stem::get_center_distance (Direction d)
134 int staff_center = 0;
135 int distance = d*(head_positions()[d] - staff_center);
136 return distance >? 0;
140 Stem::get_default_dir ()
142 return (get_center_distance (UP) >
143 get_center_distance (DOWN))
155 Stem::set_default_dir ()
157 dir_ = get_default_dir ();
161 Stem::set_default_stemlen ()
164 Real dy = paper ()->interbeam_f ();
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.
173 else if (dir_ != get_default_dir ())
181 set_stemend ((dir_ > 0) ? head_positions()[BIGGER] + len :
182 head_positions()[SMALLER] - len);
185 if (dir_ * stem_end_f () < 0)
192 Stem::set_default_extents ()
194 if (!stem_length_f ())
195 set_default_stemlen ();
207 move into note_column.cc
211 Stem::set_noteheads ()
213 if (!head_l_arr_.size ())
215 head_l_arr_.sort (Note_head::compare);
217 head_l_arr_.reverse ();
219 head_l_arr_[0]->extremal_i_ = -1;
220 head_l_arr_.top ()->extremal_i_ = 1;
222 int lastpos = head_l_arr_[0]->position_i_;
223 for (int i=1; i < head_l_arr_.size (); i ++)
225 int dy =abs (lastpos- head_l_arr_[i]->position_i_);
230 head_l_arr_[i]->x_dir_ = (stem_xdir_ == LEFT) ? LEFT : RIGHT;
235 lastpos = head_l_arr_[i]->position_i_;
240 Stem::do_pre_processing ()
242 if (yextent_drul_[DOWN]== yextent_drul_[UP])
243 set_default_extents ();
246 transparent_b_ = invisible_b ();
247 set_empty (invisible_b ());
252 Stem::do_width () const
255 if (beam_l_ || abs (flag_i_) <= 2)
259 Paper_def*p= paper ();
260 r = p->lookup_l ()->flag (flag_i_, dir_).dim_.x ();
261 r += note_delta_f ();
269 const Real ANGLE = 20* (2.0*M_PI/360.0); // ugh!
272 Stem::brew_molecule_p () const
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 ();
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);
287 Atom ss =p->lookup_l ()->stem (stem_y[DOWN]*dy,
289 mol_p->add (Atom (ss));
292 if (!beam_l_ &&abs (flag_i_) > 2)
294 Atom fl = p->lookup_l ()->flag (flag_i_, dir_);
295 fl.translate_axis(stem_y[dir_]*dy, Y_AXIS);
299 if (head_l_arr_.size())
301 mol_p->translate_axis (note_delta_f (), X_AXIS);
307 Stem::note_delta_f () const
310 if (head_l_arr_.size() && stem_xdir_ != CENTER)
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_];
320 Stem::hpos_f () const
322 return note_delta_f () +Item::hpos_f ();
326 TODO: head_l_arr_/rest_l_arr_ in do_substitute_dependent ()
329 Stem::do_substitute_dependency (Score_elem*o,Score_elem*n)
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);