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;
47 Stem::head_positions () const
50 for (int i =0; i < head_l_arr_.size (); i++)
52 int p = head_l_arr_[i]->position_i_;
53 r[BIGGER] = r[BIGGER] >? p;
54 r[SMALLER] = r[SMALLER] <? p;
60 Stem::do_print () const
63 DOUT << "flag "<< flag_i_ ;
70 Stem::stem_length_f () const
72 return yextent_drul_[UP]-yextent_drul_[DOWN] ;
76 Stem::stem_begin_f () const
78 return yextent_drul_[Direction(-dir_)];
82 Stem::chord_start_f () const
84 return head_positions()[dir_] * paper ()->internote_f ();
88 Stem::stem_end_f () const
90 return yextent_drul_[dir_];
94 Stem::set_stemend (Real se)
97 if (dir_ && dir_ * head_positions()[dir_] >= se*dir_)
98 warning (_("Weird stem size; check for narrow beams"));
101 yextent_drul_[dir_] = se;
102 yextent_drul_[Direction(-dir_)] = head_positions()[-dir_];
106 Stem::type_i () const
108 return head_l_arr_[0]->balltype_i_;
112 Stem::add (Rhythmic_head *n)
114 n->add_dependency (this); // ?
115 if (n->is_type_b (Note_head::static_name ()))
117 head_l_arr_.push ((Note_head*)n);
119 else if (n->is_type_b (Rest::static_name ()))
121 rest_l_arr_.push ((Rest*)n);
126 Stem::invisible_b () const
128 return (!head_l_arr_.size () ||
129 head_l_arr_[0]->balltype_i_ <= 0);
133 Stem::get_center_distance (Direction d)
135 int staff_center = 0;
136 int distance = d*(head_positions()[d] - staff_center);
137 return distance >? 0;
141 Stem::get_default_dir ()
143 return (get_center_distance (UP) >
144 get_center_distance (DOWN))
156 Stem::set_default_dir ()
158 dir_ = get_default_dir ();
162 Stem::set_default_stemlen ()
165 Real dy = paper ()->interbeam_f (mult_i_);
170 /* If the stem points in the "wrong" direction, it should be
171 shortened, according to [Roush & Gourlay]. Their suggestion to knock off
172 a whole staffspace is a bit drastical though.
174 else if (dir_ != get_default_dir ())
182 set_stemend ((dir_ > 0) ? head_positions()[BIGGER] + len :
183 head_positions()[SMALLER] - len);
186 if (dir_ * stem_end_f () < 0)
193 Stem::set_default_extents ()
195 if (!stem_length_f ())
196 set_default_stemlen ();
208 move into note_column.cc
212 Stem::set_noteheads ()
214 if (!head_l_arr_.size ())
216 head_l_arr_.sort (Note_head::compare);
218 head_l_arr_.reverse ();
220 head_l_arr_[0]->extremal_i_ = -1;
221 head_l_arr_.top ()->extremal_i_ = 1;
223 int lastpos = head_l_arr_[0]->position_i_;
224 for (int i=1; i < head_l_arr_.size (); i ++)
226 int dy =abs (lastpos- head_l_arr_[i]->position_i_);
231 head_l_arr_[i]->x_dir_ = (stem_xdir_ == LEFT) ? LEFT : RIGHT;
236 lastpos = head_l_arr_[i]->position_i_;
241 Stem::do_pre_processing ()
243 if (yextent_drul_[DOWN]== yextent_drul_[UP])
244 set_default_extents ();
247 transparent_b_ = invisible_b ();
248 set_empty (invisible_b ());
253 Stem::do_width () const
256 if (beam_l_ || abs (flag_i_) <= 2)
260 Paper_def*p= paper ();
261 r = p->lookup_l ()->flag (flag_i_, dir_).dim_.x ();
262 r += note_delta_f ();
270 const Real ANGLE = 20* (2.0*M_PI/360.0); // ugh!
273 Stem::brew_molecule_p () const
275 Molecule *mol_p =new Molecule;
276 Paper_def *p =paper ();
277 Drul_array<Real> stem_y = yextent_drul_;
278 Real dy = p->internote_f ();
282 if (head_l_arr_.size ())
283 head_wid = head_l_arr_[0]->width ().length ();
284 stem_y[Direction(-dir_)] += dir_ * head_wid * tan(ANGLE)/(2*dy);
288 Atom ss =p->lookup_l ()->stem (stem_y[DOWN]*dy,
290 mol_p->add (Atom (ss));
293 if (!beam_l_ &&abs (flag_i_) > 2)
295 Atom fl = p->lookup_l ()->flag (flag_i_, dir_);
296 fl.translate_axis(stem_y[dir_]*dy, Y_AXIS);
300 if (head_l_arr_.size())
302 mol_p->translate_axis (note_delta_f (), X_AXIS);
308 Stem::note_delta_f () const
311 if (head_l_arr_.size())
313 Interval head_wid(0, head_l_arr_[0]->width ().length ());
314 Real rule_thick(paper ()->rule_thickness ());
315 Interval stem_wid(-rule_thick/2, rule_thick/2);
316 if (stem_xdir_ == CENTER)
317 r = head_wid.center ();
319 r = head_wid[stem_xdir_] - stem_wid[stem_xdir_];
324 Stem::hpos_f () const
326 return note_delta_f () +Item::hpos_f ();
330 TODO: head_l_arr_/rest_l_arr_ in do_substitute_dependent ()
333 Stem::do_substitute_dependency (Score_elem*o,Score_elem*n)
335 Item * o_l = o->item ();
336 Item * n_l = n? n->item () : 0;
337 head_l_arr_.substitute ((Note_head*)o_l, (Note_head*)n_l);
338 rest_l_arr_.substitute ((Rest*)o_l, (Rest*)n_l);