2 stem.cc -- implement Stem
4 source file of the GNU LilyPond music typesetter
6 (c) 1996, 1997--1999 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"
23 Stem::set_direction (Direction d)
26 warning ("Stem direction set already!");
37 beams_i_drul_[LEFT] = beams_i_drul_[RIGHT] = -1;
38 yextent_drul_[DOWN] = yextent_drul_[UP] = 0;
45 Stem::head_positions () const
48 Mysterious FreeBSD fix by John Galbraith. Somehow, the empty intervals
49 trigger FP exceptions on FreeBSD. Fix: do not return infinity
52 if (!head_l_arr_.size ())
54 return Interval_t<int> (100,-100);
58 for (int i =0; i < head_l_arr_.size (); i++)
60 int p = head_l_arr_[i]->position_i_;
61 r[BIGGER] = r[BIGGER] >? p;
62 r[SMALLER] = r[SMALLER] <? p;
68 Stem::do_print () const
71 DOUT << "flag "<< flag_i_;
78 Stem::stem_length_f () const
80 return yextent_drul_[UP]-yextent_drul_[DOWN] ;
84 Stem::stem_begin_f () const
86 return yextent_drul_[Direction(-dir_)];
90 Stem::chord_start_f () const
92 return head_positions()[dir_] * staff_line_leading_f ()/2.0;
96 Stem::stem_end_f () const
98 return yextent_drul_[dir_];
102 Stem::set_stemend (Real se)
105 if (dir_ && dir_ * head_positions()[dir_] >= se*dir_)
106 warning (_ ("weird stem size; check for narrow beams"));
109 yextent_drul_[dir_] = se;
110 yextent_drul_[Direction(-dir_)] = head_positions()[-dir_];
114 Stem::type_i () const
116 return head_l_arr_[0]->balltype_i_;
120 Stem::add_head (Rhythmic_head *n)
122 n->add_dependency (this); // ?
123 if (Note_head *nh = dynamic_cast<Note_head *> (n))
125 head_l_arr_.push (nh);
127 else if (Rest *r = dynamic_cast<Rest *> (n))
129 rest_l_arr_.push (r);
134 Stem::invisible_b () const
136 return (!head_l_arr_.size () ||
137 head_l_arr_[0]->balltype_i_ <= 0);
141 Stem::get_center_distance (Direction d) const
143 int staff_center = 0;
144 int distance = d*(head_positions()[d] - staff_center);
145 return distance >? 0;
149 Stem::get_default_dir () const
151 return (get_center_distance (UP) >
152 get_center_distance (DOWN))
158 Stem::get_dir () const
164 Stem::set_default_dir ()
166 dir_ = get_default_dir ();
170 Stem::set_default_stemlen ()
172 Real internote_f = staff_line_leading_f ()/2.0;
173 Real length_f = paper_l ()->get_var ("stem_length0") / internote_f;
174 Real shorten_f = paper_l ()->get_var ("forced_stem_shorten0") / internote_f;
179 stems in unnatural (forced) direction should be shortened,
180 according to [Roush & Gourlay]
182 if (((int)chord_start_f ())
183 && (dir_ != get_default_dir ()))
184 length_f -= shorten_f;
191 set_stemend ((dir_ > 0) ? head_positions()[BIGGER] + length_f:
192 head_positions()[SMALLER] - length_f);
194 if (dir_ * stem_end_f () < 0)
200 Stem::set_default_extents ()
202 if (!stem_length_f ())
203 set_default_stemlen ();
208 Stem::set_noteheads ()
210 if (!head_l_arr_.size ())
212 head_l_arr_.sort (Note_head::compare);
214 head_l_arr_.reverse ();
216 Note_head * beginhead = head_l_arr_[0];
217 beginhead->set_elt_property (extremal_scm_sym, SCM_BOOL_T);
218 if (beginhead != head_l_arr_.top ())
219 head_l_arr_.top ()->set_elt_property (extremal_scm_sym, SCM_BOOL_T);
222 int lastpos = beginhead->position_i_;
223 for (int i=1; i < head_l_arr_.size (); i ++)
225 int dy =abs (lastpos- head_l_arr_[i]->position_i_);
230 head_l_arr_[i]->flip_around_stem (dir_);
235 lastpos = head_l_arr_[i]->position_i_;
240 Stem::do_pre_processing ()
242 if (yextent_drul_[DOWN]== yextent_drul_[UP])
243 set_default_extents ();
248 set_elt_property (transparent_scm_sym, SCM_BOOL_T);
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 = staff_line_leading_f ()/2.0;
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 Molecule ss =lookup_l ()->stem (stem_y[DOWN]*dy,
289 mol_p->add_molecule (ss);
292 if (!beam_l_ && abs (flag_i_) > 2)
294 Molecule fl = lookup_l ()->flag (flag_i_, dir_);
295 fl.translate_axis(stem_y[dir_]*dy, Y_AXIS);
296 mol_p->add_molecule (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_l ()->rule_thickness ());
314 Interval stem_wid(-rule_thick/2, rule_thick/2);
316 r = head_wid.center ();
318 r = head_wid[dir_] - stem_wid[dir_];
324 Stem::hpos_f () const
326 return note_delta_f () + Item::hpos_f ();
330 Stem::do_substitute_element_pointer (Score_element*o,Score_element*n)
332 if (Note_head*h=dynamic_cast<Note_head*> (o))
333 head_l_arr_.substitute (h, dynamic_cast<Note_head*>(n));
334 if (Rest *r=dynamic_cast<Rest*> (o))
335 rest_l_arr_.substitute (r, dynamic_cast<Rest*>(n));
336 if (Beam* b = dynamic_cast<Beam*> (o))
339 beam_l_ = dynamic_cast<Beam*> (n);
341 Staff_symbol_referencer::do_substitute_element_pointer (o,n);