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"
17 #include "paper-column.hh"
23 Stem::set_direction (Direction d)
25 if (!get_direction ())
26 warning (_ ("stem direction set already!"));
37 beams_i_drul_[LEFT] = beams_i_drul_[RIGHT] = -1;
38 yextent_drul_[DOWN] = yextent_drul_[UP] = 0;
40 set_direction (CENTER);
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 = (int)head_l_arr_[i]->position_f ();
61 r[BIGGER] = r[BIGGER] >? p;
62 r[SMALLER] = r[SMALLER] <? p;
68 Stem::do_print () const
71 DEBUG_OUT << "flag "<< flag_i_;
73 DEBUG_OUT << "beamed";
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(-get_direction ())];
90 Stem::chord_start_f () const
92 return head_positions()[get_direction ()] * staff_line_leading_f ()/2.0;
96 Stem::stem_end_f () const
98 return yextent_drul_[get_direction ()];
102 Stem::set_stemend (Real se)
105 if (get_direction () && get_direction () * head_positions()[get_direction ()] >= se*get_direction ())
106 warning (_ ("Weird stem size; check for narrow beams"));
109 yextent_drul_[get_direction ()] = se;
110 yextent_drul_[Direction(-get_direction ())] = head_positions()[-get_direction ()];
114 Stem::type_i () const
116 return head_l_arr_[0]->balltype_i_;
120 Stem::add_head (Rhythmic_head *n)
123 n->add_dependency (this); // ?
124 if (Note_head *nh = dynamic_cast<Note_head *> (n))
126 head_l_arr_.push (nh);
128 else if (Rest *r = dynamic_cast<Rest *> (n))
130 rest_l_arr_.push (r);
135 Stem::invisible_b () const
137 return (!head_l_arr_.size () ||
138 head_l_arr_[0]->balltype_i_ <= 0);
142 Stem::get_center_distance (Direction d) const
144 int staff_center = 0;
145 int distance = d*(head_positions()[d] - staff_center);
146 return distance >? 0;
150 Stem::get_default_dir () const
152 int du = get_center_distance (UP);
153 int dd = get_center_distance (DOWN);
156 return Direction (sign (dd -du));
158 return Direction (int(paper_l ()->get_var ("stem_default_neutral_direction")));
164 Stem::set_default_stemlen ()
167 SCM scm_len = get_elt_property("length");
168 if (scm_len != SCM_UNDEFINED)
170 length_f = gh_scm2double (scm_len);
173 length_f = paper_l ()->get_var ("stem_length0");
175 bool grace_b = get_elt_property ("grace") != SCM_UNDEFINED;
176 String type_str = grace_b ? "grace_" : "";
178 Real shorten_f = paper_l ()->get_var (type_str + "forced_stem_shorten0");
180 if (!get_direction ())
181 set_direction (get_default_dir ());
184 stems in unnatural (forced) direction should be shortened,
185 according to [Roush & Gourlay]
187 if (((int)chord_start_f ())
188 && (get_direction () != get_default_dir ()))
189 length_f -= shorten_f;
196 set_stemend ((get_direction () > 0) ? head_positions()[BIGGER] + length_f:
197 head_positions()[SMALLER] - length_f);
199 bool no_extend_b = get_elt_property ("no-stem-extend") != SCM_UNDEFINED;
200 if (!grace_b && !no_extend_b && (get_direction () * stem_end_f () < 0))
206 Stem::set_default_extents ()
208 if (!stem_length_f ())
209 set_default_stemlen ();
214 Stem::set_noteheads ()
216 if (!head_l_arr_.size ())
218 head_l_arr_.sort (Note_head::compare);
219 if (get_direction () < 0)
220 head_l_arr_.reverse ();
222 Note_head * beginhead = head_l_arr_[0];
223 beginhead->set_elt_property ("extremal", SCM_BOOL_T);
224 if (beginhead != head_l_arr_.top ())
225 head_l_arr_.top ()->set_elt_property ("extremal", SCM_BOOL_T);
228 int lastpos = int (beginhead->position_f ());
229 for (int i=1; i < head_l_arr_.size (); i ++)
231 int dy =abs (lastpos- (int)head_l_arr_[i]->position_f ());
236 head_l_arr_[i]->flip_around_stem (get_direction ());
241 lastpos = int (head_l_arr_[i]->position_f ());
246 Stem::do_pre_processing ()
248 if (yextent_drul_[DOWN]== yextent_drul_[UP])
249 set_default_extents ();
254 set_elt_property ("transparent", SCM_BOOL_T);
256 set_empty (invisible_b (), X_AXIS, Y_AXIS);
257 set_spacing_hints ();
263 set stem directions for hinting the optical spacing correction.
265 Modifies DIR_LIST property of the Stem's Score_column
267 TODO: more advanced: supply height of noteheads as well, for more advanced spacing possibilities
271 Stem::set_spacing_hints ()
275 SCM scmdir = gh_int2scm (get_direction ());
276 SCM dirlist = column_l ()->get_elt_property ("dir-list");
277 if (dirlist == SCM_UNDEFINED)
280 if (scm_sloppy_memq (scmdir, dirlist) == SCM_EOL)
282 dirlist = gh_cons (scmdir, dirlist);
283 column_l ()->set_elt_property ("dir-list", dirlist);
292 SCM st = get_elt_property ("style");
293 if ( st != SCM_UNDEFINED)
295 style = ly_scm2string (st);
298 char c = (get_direction () == UP) ? 'u' : 'd';
299 Molecule m = lookup_l ()->afm_find (String ("flags-") + to_str (c) +
301 if (!style.empty_b ())
302 m.add_molecule(lookup_l ()->afm_find (String ("flags-") + to_str (c) + style));
307 Stem::do_width () const
310 if (beam_l_ || abs (flag_i_) <= 2)
314 r = flag ().dim_.x ();
315 r += note_delta_f ();
323 const Real ANGLE = 20* (2.0*M_PI/360.0); // ugh!
326 Stem::do_brew_molecule_p () const
328 Molecule *mol_p =new Molecule;
329 Drul_array<Real> stem_y = yextent_drul_;
330 Real dy = staff_line_leading_f ()/2.0;
333 if (head_l_arr_.size ())
334 head_wid = head_l_arr_[0]->extent (X_AXIS).length ();
335 stem_y[Direction(-get_direction ())] += get_direction () * head_wid * tan(ANGLE)/(2*dy);
339 Real stem_width = paper_l ()->get_var ("stemthickness");
340 Molecule ss =lookup_l ()->filledbox (Box (Interval (-stem_width/2, stem_width/2),
341 Interval (stem_y[DOWN]*dy, stem_y[UP]*dy)));
342 mol_p->add_molecule (ss);
345 if (!beam_l_ && abs (flag_i_) > 2)
347 Molecule fl = flag ();
348 fl.translate_axis(stem_y[get_direction ()]*dy, Y_AXIS);
349 mol_p->add_molecule (fl);
352 if (head_l_arr_.size())
354 mol_p->translate_axis (note_delta_f (), X_AXIS);
360 Stem::note_delta_f () const
363 if (head_l_arr_.size())
365 Interval head_wid(0, head_l_arr_[0]->extent (X_AXIS).length ());
366 Real rule_thick = paper_l ()->get_var ("stemthickness");
368 Interval stem_wid(-rule_thick/2, rule_thick/2);
369 if (get_direction () == CENTER)
370 r = head_wid.center ();
372 r = head_wid[get_direction ()] - stem_wid[get_direction ()];
378 Stem::hpos_f () const
380 return note_delta_f () + Item::hpos_f ();
384 Stem::do_substitute_element_pointer (Score_element*o,Score_element*n)
386 if (Note_head*h=dynamic_cast<Note_head*> (o))
387 head_l_arr_.substitute (h, dynamic_cast<Note_head*>(n));
388 if (Rest *r=dynamic_cast<Rest*> (o))
389 rest_l_arr_.substitute (r, dynamic_cast<Rest*>(n));
390 if (Beam* b = dynamic_cast<Beam*> (o))
393 beam_l_ = dynamic_cast<Beam*> (n);
395 Staff_symbol_referencer::do_substitute_element_pointer (o,n);