2 stem.cc -- implement Stem
4 source file of the GNU LilyPond music typesetter
6 (c) 1996,1997 Han-Wen Nienhuys <hanwen@stack.nl>
12 #include "paper-def.hh"
13 #include "note-head.hh"
15 #include "molecule.hh"
23 IMPLEMENT_IS_TYPE_B1 (Stem,Item);
35 stem_bottom_f_ = stem_top_f_ = 0;
44 Stem::min_head_i () const
47 for (int i =0; i < head_l_arr_.size (); i++)
48 m = m <? head_l_arr_[i]->position_i_;
53 Stem::max_head_i () const
56 for (int i =0; i < head_l_arr_.size (); i++)
57 m = m >? head_l_arr_[i]->position_i_;
63 Stem::do_print () const
66 DOUT << "flag "<< flag_i_ << " print_flag? " << !(bool)beam_l_ << "abbrev_flag_i_" << abbrev_flag_i_;
71 Stem::stem_length_f () const
73 return stem_top_f_-stem_bottom_f_ ;
77 Stem::stem_start_f () const
79 return (dir_ < 0)? stem_top_f_ : stem_bottom_f_;
83 Stem::stem_end_f () const
85 return (dir_ < 0)? stem_bottom_f_ : stem_top_f_;
90 Stem::set_stemend (Real se)
93 if (! ((dir_ > 0 && se >= max_head_i ()) ||
94 (se <= min_head_i () && dir_ <0)))
95 warning ("Weird stem size; check for narrow beams");
97 stem_top_f_ = (dir_ < 0) ? max_head_i () : se;
98 stem_bottom_f_ = (dir_ < 0) ? se : min_head_i ();
102 Stem::add (Note_head *n)
104 n->add_dependency (this);
105 head_l_arr_.push (n);
111 rest_l_arr_.push (r);
112 r->add_dependency (this); // ?
116 Stem::invisible_b () const
119 return !head_l_arr_.size () ||
120 head_l_arr_[0]->balltype_i_ <= 0;
124 // if dir_ is set we return fake values.
127 Stem::get_center_distance_from_top ()
130 return (dir_ > 0) ? 0 : 1;
132 int staff_center = staff_size_i_ / 2;
133 int max = max_head_i () - staff_center;
137 // if dir_ is set we return fake values.
139 Stem::get_center_distance_from_bottom ()
142 return (dir_ > 0) ? 1 : 0;
144 int staff_center = staff_size_i_ / 2;
145 int min = staff_center - min_head_i ();
150 Stem::get_default_dir ()
154 return (get_center_distance_from_top () >=
155 get_center_distance_from_bottom ()) ?
156 (Direction)-1 : (Direction)1;
161 Stem::set_default_dir ()
163 dir_ = get_default_dir ();
167 Stem::set_default_stemlen ()
172 // ugh... how about non 5-line staffs?
173 bool on_ledger_line_b = ((max_head_i () < -2 && dir_ == 1)
174 // || (min_head_i () > staff_size_i_ && dir_ == -1));
175 || (min_head_i () > staff_size_i_ + 3 && dir_ == -1));
176 if (on_ledger_line_b)
178 set_stemend (staff_size_i_ / 2 - 1);
182 Real dy = paper ()->interbeam_f ();
184 // ugh, should get nice *rule* for this
185 if (abbrev_flag_i_ > 1)
186 len += (abbrev_flag_i_ - 1)* dy / 2;
187 set_stemend ((dir_ > 0) ? max_head_i () + len :
188 min_head_i () - len);
193 Stem::set_default_extents ()
195 if (!stem_length_f ())
196 set_default_stemlen ();
198 set_stemend ((dir_< 0) ?
199 max_head_i ()-stem_length_f (): min_head_i () +stem_length_f ());
201 stem_xoffset_f_ = paper ()->note_width ()-paper ()->rule_thickness ();
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_xoffset_f_>0) ? UP:DOWN;
238 lastpos = head_l_arr_[i]->position_i_;
243 Stem::do_pre_processing ()
245 if (stem_bottom_f_== stem_top_f_)
246 set_default_extents ();
248 flag_i_ = dir_ * abs (flag_i_);
249 transparent_b_ = invisible_b ();
250 empty_b_ = invisible_b ();
255 Stem::do_width () const
257 if (beam_l_ || abs (flag_i_) <= 4)
258 return Interval (0,0); // TODO!
259 Paper_def*p= paper ();
260 Interval r (p->lookup_l ()->flag (flag_i_).dim.x ());
268 Stem::abbrev_mol () const
270 Real dy = paper ()->interbeam_f ();
271 Real w = 1.5 * paper ()->lookup_l ()->ball (2).dim.x ().length ();
272 Real beamdy = paper ()->interline_f () / 2;
275 Real slope = paper ()->internote_f () / 4;
279 slope = 2 * beam_l_->slope;
280 // ugh, rather calc from Abbreviation_req
281 beams_i = beams_right_i_ >? beams_left_i_;
283 paper ()->lookup_l ()->beam (slope, 20 PT);
286 Atom a (paper ()->lookup_l ()->beam (slope, w));
287 a.translate (Offset(- w / 2, stem_end_f () - (w / 2 * slope)));
290 a.translate (dy + beamdy - dir_ * dy, Y_AXIS);
292 a.translate (2 * beamdy - dir_ * (beamdy - dy), Y_AXIS);
294 for (int i = 0; i < abbrev_flag_i_; i++)
297 b.translate (-dir_ * dy * (beams_i + i), Y_AXIS);
305 Stem::brew_molecule_p () const
307 Molecule *mol_p =new Molecule;
309 Real bot = stem_bottom_f_;
310 Real top = stem_top_f_;
314 Paper_def *p =paper ();
316 Real dy = p->internote_f ();
319 Symbol ss =p->lookup_l ()->stem (bot*dy,top*dy);
320 mol_p->add (Atom (ss));
323 if (!beam_l_ &&abs (flag_i_) > 4)
325 Symbol fl = p->lookup_l ()->flag (flag_i_);
329 mol_p->add_at_edge (Y_AXIS, DOWN, m);
331 else if (flag_i_ > 4)
333 mol_p->add_at_edge (Y_AXIS, UP, m);
337 assert (!abbrev_flag_i_);
341 mol_p->add (abbrev_mol ());
343 mol_p->translate (stem_xoffset_f_, X_AXIS);
348 Stem::hpos_f () const
350 return Item::hpos_f () + stem_xoffset_f_;
355 Stem::do_substitute_dependency (Score_elem*o,Score_elem*n)
357 Item * o_l = o->item ();
358 Item * n_l = n? n->item () : 0;
359 head_l_arr_.substitute ((Note_head*)o_l, (Note_head*)n_l);
360 rest_l_arr_.substitute ((Rest*)o_l, (Rest*)n_l);