2 stem.cc -- implement Stem
4 source file of the GNU LilyPond music typesetter
6 (c) 1996, 1997--1998 Han-Wen Nienhuys <hanwen@cs.uu.nl>
8 TODO: This is way too hairy
12 #include "dimension.hh"
14 #include "paper-def.hh"
15 #include "note-head.hh"
17 #include "molecule.hh"
23 IMPLEMENT_IS_TYPE_B1 (Stem,Item);
39 yextent_drul_[DOWN] = yextent_drul_[UP] = 0;
43 dir_forced_b_ = false;
51 Stem::head_positions () const
54 for (int i =0; i < head_l_arr_.size (); i++)
56 int p = head_l_arr_[i]->position_i_;
57 r[BIGGER] = r[BIGGER] >? p;
58 r[SMALLER] = r[SMALLER] <? p;
64 Stem::do_print () const
67 DOUT << "flag "<< flag_i_;
74 Stem::stem_length_f () const
76 return yextent_drul_[UP]-yextent_drul_[DOWN] ;
80 Stem::stem_begin_f () const
82 return yextent_drul_[Direction(-dir_)];
86 Stem::chord_start_f () const
88 return head_positions()[dir_] * paper ()->internote_f ();
92 Stem::stem_end_f () const
94 return yextent_drul_[dir_];
98 Stem::set_stemend (Real se)
101 if (dir_ && dir_ * head_positions()[dir_] >= se*dir_)
102 warning (_ ("weird stem size; check for narrow beams"));
105 yextent_drul_[dir_] = se;
106 yextent_drul_[Direction(-dir_)] = head_positions()[-dir_];
110 Stem::type_i () const
112 return head_l_arr_[0]->balltype_i_;
116 Stem::add_head (Rhythmic_head *n)
118 n->add_dependency (this); // ?
119 if (n->is_type_b (Note_head::static_name ()))
121 head_l_arr_.push ((Note_head*)n);
123 else if (n->is_type_b (Rest::static_name ()))
125 rest_l_arr_.push ((Rest*)n);
130 Stem::invisible_b () const
132 return (!head_l_arr_.size () ||
133 head_l_arr_[0]->balltype_i_ <= 0);
137 Stem::get_center_distance (Direction d) const
139 int staff_center = 0;
140 int distance = d*(head_positions()[d] - staff_center);
141 return distance >? 0;
145 Stem::get_default_dir () const
147 return (get_center_distance (UP) >
148 get_center_distance (DOWN))
154 Stem::get_dir () const
160 Stem::set_default_dir ()
162 dir_ = get_default_dir ();
166 Stem::set_default_stemlen ()
170 urg; this should be handled by Stem_info
173 Real length_f = paper ()->get_var ("stem_length");
174 Real shorten_f = paper ()->get_var ("forced_stem_shorten");
176 Real internote_f = paper ()->internote_f ();
177 length_f /= internote_f;
178 shorten_f /= internote_f;
184 stems in unnatural (forced) direction should be shortened,
185 accoding to [Roush & Gourlay]
187 else if (dir_ != get_default_dir ())
188 len -= shorten_f / internote_f;
195 set_stemend ((dir_ > 0) ? head_positions()[BIGGER] + len :
196 head_positions()[SMALLER] - len);
198 if (dir_ * stem_end_f () < 0)
205 Stem::set_default_extents ()
207 if (!stem_length_f ())
208 set_default_stemlen ();
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
268 if (beam_l_ || abs (flag_i_) <= 2)
272 r = lookup_l ()->flag (flag_i_, dir_).dim_.x ();
273 r += note_delta_f ();
281 const Real ANGLE = 20* (2.0*M_PI/360.0); // ugh!
284 Stem::brew_molecule_p () const
286 Molecule *mol_p =new Molecule;
287 Drul_array<Real> stem_y = yextent_drul_;
288 Real dy = paper ()->internote_f ();
292 if (head_l_arr_.size ())
293 head_wid = head_l_arr_[0]->width ().length ();
294 stem_y[Direction(-dir_)] += dir_ * head_wid * tan(ANGLE)/(2*dy);
298 Atom ss =lookup_l ()->stem (stem_y[DOWN]*dy,
300 mol_p->add_atom (ss);
303 if (!beam_l_ && abs (flag_i_) > 2)
305 Atom fl = lookup_l ()->flag (flag_i_, dir_);
306 fl.translate_axis(stem_y[dir_]*dy, Y_AXIS);
307 mol_p->add_atom (fl);
310 if (head_l_arr_.size())
312 mol_p->translate_axis (note_delta_f (), X_AXIS);
318 Stem::note_delta_f () const
321 if (head_l_arr_.size())
323 Interval head_wid(0, head_l_arr_[0]->width ().length ());
324 Real rule_thick(paper ()->rule_thickness ());
325 Interval stem_wid(-rule_thick/2, rule_thick/2);
326 if (stem_xdir_ == CENTER)
329 r = head_wid.center ();
331 r = (head_wid.min () + head_wid.max ()) / 2;
334 r = head_wid[stem_xdir_] - stem_wid[stem_xdir_];
340 Stem::hpos_f () const
342 return note_delta_f () + Item::hpos_f ();
346 TODO: head_l_arr_/rest_l_arr_ in do_substitute_dependent ()
349 Stem::do_substitute_dependency (Score_element*o,Score_element*n)
351 Item * o_l = o->access_Item ();
352 Item * n_l = n? n->access_Item () : 0;
353 head_l_arr_.substitute ((Note_head*)o_l, (Note_head*)n_l);
354 rest_l_arr_.substitute ((Rest*)o_l, (Rest*)n_l);