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
10 #include "dimension-cache.hh"
13 #include "paper-def.hh"
14 #include "note-head.hh"
16 #include "molecule.hh"
17 #include "paper-column.hh"
24 beams_i_drul_[LEFT] = beams_i_drul_[RIGHT] = -1;
25 yextent_drul_[DOWN] = yextent_drul_[UP] = 0;
30 Stem::head_positions () const
33 Mysterious FreeBSD fix by John Galbraith. Somehow, the empty intervals
34 trigger FP exceptions on FreeBSD. Fix: do not return infinity
37 if (!head_l_arr_.size ())
39 return Interval_t<int> (100,-100);
43 for (int i =0; i < head_l_arr_.size (); i++)
45 int p = (int)head_l_arr_[i]->position_f ();
46 r[BIGGER] = r[BIGGER] >? p;
47 r[SMALLER] = r[SMALLER] <? p;
53 Stem::do_print () const
56 DEBUG_OUT << "flag "<< flag_i_;
61 Stem::stem_length_f () const
63 return yextent_drul_[UP]-yextent_drul_[DOWN] ;
67 Stem::stem_begin_f () const
69 return yextent_drul_[Direction(-get_direction ())];
73 Stem::chord_start_f () const
75 return head_positions()[get_direction ()] * staff_line_leading_f ()/2.0;
79 Stem::stem_end_f () const
81 return yextent_drul_[get_direction ()];
85 Stem::set_stemend (Real se)
88 if (get_direction () && get_direction () * head_positions()[get_direction ()] >= se*get_direction ())
89 warning (_ ("Weird stem size; check for narrow beams"));
92 yextent_drul_[get_direction ()] = se;
93 yextent_drul_[Direction(-get_direction ())] = head_positions()[-get_direction ()];
99 return head_l_arr_[0]->balltype_i_;
103 Stem::add_head (Rhythmic_head *n)
106 n->add_dependency (this); // ?
107 if (Note_head *nh = dynamic_cast<Note_head *> (n))
109 head_l_arr_.push (nh);
111 else if (Rest *r = dynamic_cast<Rest *> (n))
113 rest_l_arr_.push (r);
118 Stem::invisible_b () const
120 return (!head_l_arr_.size () ||
121 head_l_arr_[0]->balltype_i_ <= 0);
125 Stem::get_center_distance (Direction d) const
127 int staff_center = 0;
128 int distance = d*(head_positions()[d] - staff_center);
129 return distance >? 0;
133 Stem::get_default_dir () const
135 int du = get_center_distance (UP);
136 int dd = get_center_distance (DOWN);
139 return Direction (sign (dd -du));
141 return Direction (int(paper_l ()->get_var ("stem_default_neutral_direction")));
147 Stem::set_default_stemlen ()
150 SCM scm_len = get_elt_property("length");
151 if (scm_len != SCM_UNDEFINED)
153 length_f = gh_scm2double (scm_len);
156 length_f = paper_l ()->get_var ("stem_length0");
158 bool grace_b = get_elt_property ("grace") != SCM_UNDEFINED;
159 String type_str = grace_b ? "grace_" : "";
161 Real shorten_f = paper_l ()->get_var (type_str + "forced_stem_shorten0");
163 if (!get_direction ())
164 set_direction (get_default_dir ());
167 stems in unnatural (forced) direction should be shortened,
168 according to [Roush & Gourlay]
170 if (((int)chord_start_f ())
171 && (get_direction () != get_default_dir ()))
172 length_f -= shorten_f;
179 set_stemend ((get_direction () > 0) ? head_positions()[BIGGER] + length_f:
180 head_positions()[SMALLER] - length_f);
182 bool no_extend_b = get_elt_property ("no-stem-extend") != SCM_UNDEFINED;
183 if (!grace_b && !no_extend_b && (get_direction () * stem_end_f () < 0))
189 Stem::set_default_extents ()
191 if (!stem_length_f ())
192 set_default_stemlen ();
197 Stem::set_noteheads ()
199 if (!head_l_arr_.size ())
201 head_l_arr_.sort (Note_head::compare);
202 if (get_direction () < 0)
203 head_l_arr_.reverse ();
205 Note_head * beginhead = head_l_arr_[0];
206 beginhead->set_elt_property ("extremal", SCM_BOOL_T);
207 if (beginhead != head_l_arr_.top ())
208 head_l_arr_.top ()->set_elt_property ("extremal", SCM_BOOL_T);
211 int lastpos = int (beginhead->position_f ());
212 for (int i=1; i < head_l_arr_.size (); i ++)
214 int dy =abs (lastpos- (int)head_l_arr_[i]->position_f ());
219 head_l_arr_[i]->flip_around_stem (get_direction ());
224 lastpos = int (head_l_arr_[i]->position_f ());
229 Stem::do_pre_processing ()
231 if (yextent_drul_[DOWN]== yextent_drul_[UP])
232 set_default_extents ();
237 set_elt_property ("transparent", SCM_BOOL_T);
243 set_spacing_hints ();
249 set stem directions for hinting the optical spacing correction.
251 Modifies DIR_LIST property of the Stem's Score_column
253 TODO: more advanced: supply height of noteheads as well, for more advanced spacing possibilities
257 Stem::set_spacing_hints ()
261 SCM scmdir = gh_int2scm (get_direction ());
262 SCM dirlist = column_l ()->get_elt_property ("dir-list");
263 if (dirlist == SCM_UNDEFINED)
266 if (scm_sloppy_memq (scmdir, dirlist) == SCM_EOL)
268 dirlist = gh_cons (scmdir, dirlist);
269 column_l ()->set_elt_property ("dir-list", dirlist);
278 SCM st = get_elt_property ("style");
279 if ( st != SCM_UNDEFINED)
281 style = ly_scm2string (st);
284 char c = (get_direction () == UP) ? 'u' : 'd';
285 Molecule m = lookup_l ()->afm_find (String ("flags-") + to_str (c) +
287 if (!style.empty_b ())
288 m.add_molecule(lookup_l ()->afm_find (String ("flags-") + to_str (c) + style));
293 Stem::dim_callback (Dimension_cache const* c)
295 Stem * s = dynamic_cast<Stem*> (c->element_l ());
298 if (s->get_elt_property ("beam") != SCM_UNDEFINED || abs (s->flag_i_) <= 2)
302 r = s->flag ().dim_.x ();
303 r += s->note_delta_f ();
311 const Real ANGLE = 20* (2.0*M_PI/360.0); // ugh!
314 Stem::do_brew_molecule_p () const
316 Molecule *mol_p =new Molecule;
317 Drul_array<Real> stem_y = yextent_drul_;
318 Real dy = staff_line_leading_f ()/2.0;
321 if (head_l_arr_.size ())
322 head_wid = head_l_arr_[0]->extent (X_AXIS).length ();
323 stem_y[Direction(-get_direction ())] += get_direction () * head_wid * tan(ANGLE)/(2*dy);
327 Real stem_width = paper_l ()->get_var ("stemthickness");
328 Molecule ss =lookup_l ()->filledbox (Box (Interval (-stem_width/2, stem_width/2),
329 Interval (stem_y[DOWN]*dy, stem_y[UP]*dy)));
330 mol_p->add_molecule (ss);
333 if (get_elt_property ("beam") == SCM_UNDEFINED
334 && abs (flag_i_) > 2)
336 Molecule fl = flag ();
337 fl.translate_axis(stem_y[get_direction ()]*dy, Y_AXIS);
338 mol_p->add_molecule (fl);
341 if (head_l_arr_.size())
343 mol_p->translate_axis (note_delta_f (), X_AXIS);
349 Stem::note_delta_f () const
352 if (head_l_arr_.size())
354 Interval head_wid(0, head_l_arr_[0]->extent (X_AXIS).length ());
355 Real rule_thick = paper_l ()->get_var ("stemthickness");
357 Interval stem_wid(-rule_thick/2, rule_thick/2);
358 if (get_direction () == CENTER)
359 r = head_wid.center ();
361 r = head_wid[get_direction ()] - stem_wid[get_direction ()];
367 Stem::hpos_f () const
369 return note_delta_f () + Item::hpos_f ();
373 Stem::do_substitute_element_pointer (Score_element*o,Score_element*n)
375 if (Note_head*h=dynamic_cast<Note_head*> (o))
376 head_l_arr_.substitute (h, dynamic_cast<Note_head*>(n));
377 if (Rest *r=dynamic_cast<Rest*> (o))
378 rest_l_arr_.substitute (r, dynamic_cast<Rest*>(n));
384 SCM b= get_elt_property ("beam");
385 if (SMOB_IS_TYPE_B(Score_element, b))
386 return dynamic_cast<Beam*> (SMOB_TO_TYPE(Score_element,b));