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
165 Stem::set_default_stemlen ()
167 Real internote_f = staff_line_leading_f ()/2.0;
168 Real length_f = paper_l ()->get_var ("stem_length0") / internote_f;
169 Real shorten_f = paper_l ()->get_var ("forced_stem_shorten0") / internote_f;
172 dir_ = get_default_dir ();
175 stems in unnatural (forced) direction should be shortened,
176 according to [Roush & Gourlay]
178 if (((int)chord_start_f ())
179 && (dir_ != get_default_dir ()))
180 length_f -= shorten_f;
187 set_stemend ((dir_ > 0) ? head_positions()[BIGGER] + length_f:
188 head_positions()[SMALLER] - length_f);
190 if (dir_ * stem_end_f () < 0)
196 Stem::set_default_extents ()
198 if (!stem_length_f ())
199 set_default_stemlen ();
204 Stem::set_noteheads ()
206 if (!head_l_arr_.size ())
208 head_l_arr_.sort (Note_head::compare);
210 head_l_arr_.reverse ();
212 Note_head * beginhead = head_l_arr_[0];
213 beginhead->set_elt_property (extremal_scm_sym, SCM_BOOL_T);
214 if (beginhead != head_l_arr_.top ())
215 head_l_arr_.top ()->set_elt_property (extremal_scm_sym, SCM_BOOL_T);
218 int lastpos = beginhead->position_i_;
219 for (int i=1; i < head_l_arr_.size (); i ++)
221 int dy =abs (lastpos- head_l_arr_[i]->position_i_);
226 head_l_arr_[i]->flip_around_stem (dir_);
231 lastpos = head_l_arr_[i]->position_i_;
236 Stem::do_pre_processing ()
238 if (yextent_drul_[DOWN]== yextent_drul_[UP])
239 set_default_extents ();
244 set_elt_property (transparent_scm_sym, SCM_BOOL_T);
246 set_empty (invisible_b ());
247 set_spacing_hints ();
253 set stem directions for hinting the optical spacing correction.
255 Modifies DIR_LIST property of the Stem's Score_column
257 TODO: more advanced: supply height of noteheads as well, for more advanced spacing possibilities
260 Stem::set_spacing_hints ()
264 SCM scmdir = gh_int2scm (dir_);
265 SCM dirlist = column_l ()->get_elt_property (dir_list_scm_sym);
266 if (dirlist == SCM_BOOL_F)
269 dirlist = SCM_CDR (dirlist);
271 if (scm_sloppy_memq (scmdir, dirlist) == SCM_EOL)
273 dirlist = gh_cons (scmdir, dirlist);
274 column_l ()->set_elt_property (dir_list_scm_sym, dirlist);
281 Stem::do_width () const
284 if (beam_l_ || abs (flag_i_) <= 2)
288 r = lookup_l ()->flag (flag_i_, dir_).dim_.x ();
289 r += note_delta_f ();
297 const Real ANGLE = 20* (2.0*M_PI/360.0); // ugh!
300 Stem::do_brew_molecule_p () const
302 Molecule *mol_p =new Molecule;
303 Drul_array<Real> stem_y = yextent_drul_;
304 Real dy = staff_line_leading_f ()/2.0;
307 if (head_l_arr_.size ())
308 head_wid = head_l_arr_[0]->extent (X_AXIS).length ();
309 stem_y[Direction(-dir_)] += dir_ * head_wid * tan(ANGLE)/(2*dy);
313 Real stem_width = paper_l ()->get_var ("stemthickness");
314 Molecule ss =lookup_l ()->filledbox (Box (Interval (-stem_width/2, stem_width/2),
315 Interval (stem_y[DOWN]*dy, stem_y[UP]*dy)));
316 mol_p->add_molecule (ss);
319 if (!beam_l_ && abs (flag_i_) > 2)
321 Molecule fl = lookup_l ()->flag (flag_i_, dir_);
322 fl.translate_axis(stem_y[dir_]*dy, Y_AXIS);
323 mol_p->add_molecule (fl);
326 if (head_l_arr_.size())
328 mol_p->translate_axis (note_delta_f (), X_AXIS);
334 Stem::note_delta_f () const
337 if (head_l_arr_.size())
339 Interval head_wid(0, head_l_arr_[0]->extent (X_AXIS).length ());
340 Real rule_thick(paper_l ()->rule_thickness ());
341 Interval stem_wid(-rule_thick/2, rule_thick/2);
343 r = head_wid.center ();
345 r = head_wid[dir_] - stem_wid[dir_];
351 Stem::hpos_f () const
353 return note_delta_f () + Item::hpos_f ();
357 Stem::do_substitute_element_pointer (Score_element*o,Score_element*n)
359 if (Note_head*h=dynamic_cast<Note_head*> (o))
360 head_l_arr_.substitute (h, dynamic_cast<Note_head*>(n));
361 if (Rest *r=dynamic_cast<Rest*> (o))
362 rest_l_arr_.substitute (r, dynamic_cast<Rest*>(n));
363 if (Beam* b = dynamic_cast<Beam*> (o))
366 beam_l_ = dynamic_cast<Beam*> (n);
368 Staff_symbol_referencer::do_substitute_element_pointer (o,n);