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] = -1;
37 yextent_drul_[DOWN] = yextent_drul_[UP] = 0;
41 dir_forced_b_ = false;
50 Stem::head_positions () const
53 for (int i =0; i < head_l_arr_.size (); i++)
55 int p = head_l_arr_[i]->position_i_;
56 r[BIGGER] = r[BIGGER] >? p;
57 r[SMALLER] = r[SMALLER] <? p;
63 Stem::do_print () const
66 DOUT << "flag "<< flag_i_;
73 Stem::stem_length_f () const
75 return yextent_drul_[UP]-yextent_drul_[DOWN] ;
79 Stem::stem_begin_f () const
81 return yextent_drul_[Direction(-dir_)];
85 Stem::chord_start_f () const
87 return head_positions()[dir_] * paper ()->internote_f ();
91 Stem::stem_end_f () const
93 return yextent_drul_[dir_];
97 Stem::set_stemend (Real se)
100 if (dir_ && dir_ * head_positions()[dir_] >= se*dir_)
101 warning (_ ("weird stem size; check for narrow beams"));
104 yextent_drul_[dir_] = se;
105 yextent_drul_[Direction(-dir_)] = head_positions()[-dir_];
109 Stem::type_i () const
111 return head_l_arr_[0]->balltype_i_;
115 Stem::add_head (Rhythmic_head *n)
117 n->add_dependency (this); // ?
118 if (dynamic_cast<Note_head *> (n))
120 head_l_arr_.push ((Note_head*)n);
122 else if (dynamic_cast<Rest *> (n))
124 rest_l_arr_.push ((Rest*)n);
129 Stem::invisible_b () const
131 return (!head_l_arr_.size () ||
132 head_l_arr_[0]->balltype_i_ <= 0);
136 Stem::get_center_distance (Direction d) const
138 int staff_center = 0;
139 int distance = d*(head_positions()[d] - staff_center);
140 return distance >? 0;
144 Stem::get_default_dir () const
146 return (get_center_distance (UP) >
147 get_center_distance (DOWN))
153 Stem::get_dir () const
159 Stem::set_default_dir ()
161 dir_ = get_default_dir ();
165 Stem::set_default_stemlen ()
167 Real internote_f = paper ()->internote_f ();
168 Real length_f = paper ()->get_var ("stem_length0") / internote_f;
169 Real shorten_f = paper ()->get_var ("forced_stem_shorten0") / internote_f;
174 stems in unnatural (forced) direction should be shortened,
175 accoding to [Roush & Gourlay]
177 if (((int)chord_start_f ())
178 && (dir_ != get_default_dir ()))
179 length_f -= shorten_f;
186 set_stemend ((dir_ > 0) ? head_positions()[BIGGER] + length_f:
187 head_positions()[SMALLER] - length_f);
189 if (dir_ * stem_end_f () < 0)
195 Stem::set_default_extents ()
197 if (!stem_length_f ())
198 set_default_stemlen ();
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_xdir_ == LEFT) ? LEFT : RIGHT;
238 lastpos = head_l_arr_[i]->position_i_;
243 Stem::do_pre_processing ()
245 if (yextent_drul_[DOWN]== yextent_drul_[UP])
246 set_default_extents ();
249 transparent_b_ = invisible_b ();
250 set_empty (invisible_b ());
255 Stem::do_width () const
258 if (beam_l_ || abs (flag_i_) <= 2)
262 r = lookup_l ()->flag (flag_i_, dir_).dim_.x ();
263 r += note_delta_f ();
271 const Real ANGLE = 20* (2.0*M_PI/360.0); // ugh!
274 Stem::do_brew_molecule_p () const
276 Molecule *mol_p =new Molecule;
277 Drul_array<Real> stem_y = yextent_drul_;
278 Real dy = paper ()->internote_f ();
281 if (head_l_arr_.size ())
282 head_wid = head_l_arr_[0]->extent (X_AXIS).length ();
283 stem_y[Direction(-dir_)] += dir_ * head_wid * tan(ANGLE)/(2*dy);
287 Atom ss =lookup_l ()->stem (stem_y[DOWN]*dy,
289 mol_p->add_atom (ss);
292 if (!beam_l_ && abs (flag_i_) > 2)
294 Atom fl = lookup_l ()->flag (flag_i_, dir_);
295 fl.translate_axis(stem_y[dir_]*dy, Y_AXIS);
296 mol_p->add_atom (fl);
299 if (head_l_arr_.size())
301 mol_p->translate_axis (note_delta_f (), X_AXIS);
307 Stem::note_delta_f () const
310 if (head_l_arr_.size())
312 Interval head_wid(0, head_l_arr_[0]->extent (X_AXIS).length ());
313 Real rule_thick(paper ()->rule_thickness ());
314 Interval stem_wid(-rule_thick/2, rule_thick/2);
315 if (stem_xdir_ == CENTER)
316 r = head_wid.center ();
318 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_element*o,Score_element*n)
335 if (Note_head*h=dynamic_cast<Note_head*> (o))
336 head_l_arr_.substitute (h, dynamic_cast<Note_head*>(n));
337 if (Rest *r=dynamic_cast<Rest*> (o))
338 rest_l_arr_.substitute (r, dynamic_cast<Rest*>(n));