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 stem_bottom_f_ = stem_top_f_ = 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 stem_top_f_-stem_bottom_f_ ;
82 Stem::stem_start_f () const
84 return (dir_ < 0)? stem_top_f_ : stem_bottom_f_;
88 Stem::stem_end_f () const
90 return (dir_ < 0)? stem_bottom_f_ : stem_top_f_;
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 stem_top_f_ = (dir_ < 0) ? max_head_i () : se;
103 stem_bottom_f_ = (dir_ < 0) ? se : min_head_i ();
107 Stem::type_i () const
109 return head_l_arr_[0]->balltype_i_;
113 Stem::add (Note_head *n)
115 n->add_dependency (this);
116 head_l_arr_.push (n);
122 rest_l_arr_.push (r);
123 r->add_dependency (this); // ?
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 = staff_size_i_ / 2;
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 = staff_size_i_ / 2;
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 ()
182 // ugh... how about non 5-line staffs?
183 bool on_ledger_line_b = ((max_head_i () < -2 && dir_ == 1)
184 // || (min_head_i () > staff_size_i_ && dir_ == -1));
185 || (min_head_i () > staff_size_i_ + 3 && dir_ == -1));
186 if (on_ledger_line_b)
188 set_stemend (staff_size_i_ / 2 - 1);
192 Real dy = paper ()->interbeam_f ();
194 // ugh, should get nice *rule* for this
195 if (abbrev_flag_i_ > 1)
196 len += (abbrev_flag_i_ - 1)* dy / 2;
197 set_stemend ((dir_ > 0) ? max_head_i () + len :
198 min_head_i () - len);
203 Stem::set_default_extents ()
205 if (!stem_length_f ())
206 set_default_stemlen ();
208 set_stemend ((dir_< 0) ?
209 max_head_i ()-stem_length_f (): min_head_i () + stem_length_f ());
210 // ugh, a whole ball is wider
211 if (head_l_arr_[0]->balltype_i_ <= 0)
212 stem_xoffset_f_ = paper ()->note_width () / 2;
214 stem_xoffset_f_ = paper ()->note_width () - paper ()->rule_thickness ();
222 move into note_column.cc
226 Stem::set_noteheads ()
228 if (!head_l_arr_.size ())
230 head_l_arr_.sort (Note_head::compare);
232 head_l_arr_.reverse ();
234 head_l_arr_[0]->extremal_i_ = -1;
235 head_l_arr_.top ()->extremal_i_ = 1;
237 int lastpos = head_l_arr_[0]->position_i_;
238 for (int i=1; i < head_l_arr_.size (); i ++)
240 int dy =abs (lastpos- head_l_arr_[i]->position_i_);
245 head_l_arr_[i]->x_dir_ = (stem_xoffset_f_>0) ? UP:DOWN;
250 lastpos = head_l_arr_[i]->position_i_;
255 Stem::do_pre_processing ()
257 if (stem_bottom_f_== stem_top_f_)
258 set_default_extents ();
261 transparent_b_ = invisible_b ();
262 set_empty (invisible_b ());
267 Stem::do_width () const
272 r = abbrev_mol ().extent ().x ();
274 else if (beam_l_ || abs (flag_i_) <= 2)
278 Paper_def*p= paper ();
279 r = p->lookup_l ()->flag (flag_i_, dir_).dim.x ();
288 Stem::abbrev_mol () const
290 Real dy = paper ()->interbeam_f ();
291 Real w = 1.5 * paper ()->lookup_l ()->ball (2).dim.x ().length ();
292 Real beamdy = paper ()->interline_f () / 2;
295 Real slope = paper ()->internote_f () / 4;
299 slope = 2 * beam_l_->slope;
300 // ugh, rather calc from Abbreviation_req
301 beams_i = beams_right_i_ >? beams_left_i_;
303 paper ()->lookup_l ()->beam (slope, 20 PT);
306 Atom a (paper ()->lookup_l ()->beam (slope, w));
307 a.translate (Offset(- w / 2, stem_end_f () - (w / 2 * slope)));
310 a.translate (dy + beamdy - dir_ * dy, Y_AXIS);
312 a.translate (2 * beamdy - dir_ * (beamdy - dy), Y_AXIS);
314 for (int i = 0; i < abbrev_flag_i_; i++)
317 b.translate (-dir_ * dy * (beams_i + i), Y_AXIS);
325 Stem::brew_molecule_p () const
327 Molecule *mol_p =new Molecule;
329 Real bot = stem_bottom_f_;
330 Real top = stem_top_f_;
334 Paper_def *p =paper ();
336 Real dy = p->internote_f ();
339 Symbol ss =p->lookup_l ()->stem (bot*dy,top*dy);
340 mol_p->add (Atom (ss));
343 if (!beam_l_ &&abs (flag_i_) > 2)
345 Symbol fl = p->lookup_l ()->flag (flag_i_, dir_);
346 mol_p->add_at_edge (Y_AXIS, dir_, Molecule (Atom (fl)));
347 assert (!abbrev_flag_i_);
351 mol_p->add (abbrev_mol ());
353 mol_p->translate (stem_xoffset_f_, X_AXIS);
358 Stem::hpos_f () const
360 return Item::hpos_f () + stem_xoffset_f_;
365 Stem::do_substitute_dependency (Score_elem*o,Score_elem*n)
367 Item * o_l = o->item ();
368 Item * n_l = n? n->item () : 0;
369 head_l_arr_.substitute ((Note_head*)o_l, (Note_head*)n_l);
370 rest_l_arr_.substitute ((Rest*)o_l, (Rest*)n_l);