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
13 #include "paper-def.hh"
14 #include "note-head.hh"
16 #include "molecule.hh"
34 beams_i_drul_[LEFT] = beams_i_drul_[RIGHT] = 0;
37 yextent_drul_[DOWN] = yextent_drul_[UP] = 0;
41 dir_forced_b_ = false;
49 Stem::head_positions () const
52 for (int i =0; i < head_l_arr_.size (); i++)
54 int p = head_l_arr_[i]->position_i_;
55 r[BIGGER] = r[BIGGER] >? p;
56 r[SMALLER] = r[SMALLER] <? p;
62 Stem::do_print () const
65 DOUT << "flag "<< flag_i_;
72 Stem::stem_length_f () const
74 return yextent_drul_[UP]-yextent_drul_[DOWN] ;
78 Stem::stem_begin_f () const
80 return yextent_drul_[Direction(-dir_)];
84 Stem::chord_start_f () const
86 return head_positions()[dir_] * paper ()->internote_f ();
90 Stem::stem_end_f () const
92 return yextent_drul_[dir_];
96 Stem::set_stemend (Real se)
99 if (dir_ && dir_ * head_positions()[dir_] >= se*dir_)
100 warning (_ ("weird stem size; check for narrow beams"));
103 yextent_drul_[dir_] = se;
104 yextent_drul_[Direction(-dir_)] = head_positions()[-dir_];
108 Stem::type_i () const
110 return head_l_arr_[0]->balltype_i_;
114 Stem::add_head (Rhythmic_head *n)
116 n->add_dependency (this); // ?
117 if (dynamic_cast<Note_head *> (n))
119 head_l_arr_.push ((Note_head*)n);
121 else if (dynamic_cast<Rest *> (n))
123 rest_l_arr_.push ((Rest*)n);
128 Stem::invisible_b () const
130 return (!head_l_arr_.size () ||
131 head_l_arr_[0]->balltype_i_ <= 0);
135 Stem::get_center_distance (Direction d) const
137 int staff_center = 0;
138 int distance = d*(head_positions()[d] - staff_center);
139 return distance >? 0;
143 Stem::get_default_dir () const
145 return (get_center_distance (UP) >
146 get_center_distance (DOWN))
152 Stem::get_dir () const
158 Stem::set_default_dir ()
160 dir_ = get_default_dir ();
164 Stem::set_default_stemlen ()
168 urg; this should be handled by Stem_info
171 Real length_f = paper ()->get_var ("stem_length");
172 Real shorten_f = paper ()->get_var ("forced_stem_shorten");
174 Real internote_f = paper ()->internote_f ();
175 length_f /= internote_f;
176 shorten_f /= internote_f;
182 stems in unnatural (forced) direction should be shortened,
183 accoding to [Roush & Gourlay]
185 else if (dir_ != get_default_dir ())
186 len -= shorten_f / internote_f;
193 set_stemend ((dir_ > 0) ? head_positions()[BIGGER] + len :
194 head_positions()[SMALLER] - len);
196 if (dir_ * stem_end_f () < 0)
203 Stem::set_default_extents ()
205 if (!stem_length_f ())
206 set_default_stemlen ();
218 move into note_column.cc
222 Stem::set_noteheads ()
224 if (!head_l_arr_.size ())
226 head_l_arr_.sort (Note_head::compare);
228 head_l_arr_.reverse ();
230 head_l_arr_[0]->extremal_i_ = -1;
231 head_l_arr_.top ()->extremal_i_ = 1;
233 int lastpos = head_l_arr_[0]->position_i_;
234 for (int i=1; i < head_l_arr_.size (); i ++)
236 int dy =abs (lastpos- head_l_arr_[i]->position_i_);
241 head_l_arr_[i]->x_dir_ = (stem_xdir_ == LEFT) ? LEFT : RIGHT;
246 lastpos = head_l_arr_[i]->position_i_;
251 Stem::do_pre_processing ()
253 if (yextent_drul_[DOWN]== yextent_drul_[UP])
254 set_default_extents ();
257 transparent_b_ = invisible_b ();
258 set_empty (invisible_b ());
263 Stem::do_width () const
266 if (beam_l_ || abs (flag_i_) <= 2)
270 r = lookup_l ()->flag (flag_i_, dir_).dim_.x ();
271 r += note_delta_f ();
279 const Real ANGLE = 20* (2.0*M_PI/360.0); // ugh!
282 Stem::brew_molecule_p () const
284 Molecule *mol_p =new Molecule;
285 Drul_array<Real> stem_y = yextent_drul_;
286 Real dy = paper ()->internote_f ();
289 if (head_l_arr_.size ())
290 head_wid = head_l_arr_[0]->width ().length ();
291 stem_y[Direction(-dir_)] += dir_ * head_wid * tan(ANGLE)/(2*dy);
295 Atom ss =lookup_l ()->stem (stem_y[DOWN]*dy,
297 mol_p->add_atom (ss);
300 if (!beam_l_ && abs (flag_i_) > 2)
302 Atom fl = lookup_l ()->flag (flag_i_, dir_);
303 fl.translate_axis(stem_y[dir_]*dy, Y_AXIS);
304 mol_p->add_atom (fl);
307 if (head_l_arr_.size())
309 mol_p->translate_axis (note_delta_f (), X_AXIS);
315 Stem::note_delta_f () const
318 if (head_l_arr_.size())
320 Interval head_wid(0, head_l_arr_[0]->width ().length ());
321 Real rule_thick(paper ()->rule_thickness ());
322 Interval stem_wid(-rule_thick/2, rule_thick/2);
323 if (stem_xdir_ == CENTER)
324 r = head_wid.center ();
326 r = head_wid[stem_xdir_] - stem_wid[stem_xdir_];
332 Stem::hpos_f () const
334 return note_delta_f () + Item::hpos_f ();
338 TODO: head_l_arr_/rest_l_arr_ in do_substitute_dependent ()
341 Stem::do_substitute_dependency (Score_element*o,Score_element*n)
343 Item * o_l = dynamic_cast <Item *> (o);
344 Item * n_l = n? dynamic_cast <Item *> (n) : 0;
345 head_l_arr_.substitute ((Note_head*)o_l, (Note_head*)n_l);
346 rest_l_arr_.substitute ((Rest*)o_l, (Rest*)n_l);