2 accidental-placement.cc -- implement Accidental_placement
4 source file of the GNU LilyPond music typesetter
6 (c) 2002--2006 Han-Wen Nienhuys <hanwen@xs4all.nl>
10 #include "accidental-placement.hh"
12 #include "rhythmic-head.hh"
13 #include "accidental-interface.hh"
15 #include "note-collision.hh"
16 #include "note-column.hh"
18 #include "pointer-group-interface.hh"
20 #include "stream-event.hh"
25 Accidental_placement::add_accidental (Grob *me, Grob *a)
27 a->set_parent (me, X_AXIS);
28 a->set_property ("X-offset", Grob::x_parent_positioning_proc);
29 SCM cause = a->get_parent (Y_AXIS)->get_property ("cause");
31 Stream_event *mcause = unsmob_stream_event (cause);
34 programming_error ("note head has no event cause");
38 Pitch *p = unsmob_pitch (mcause->get_property ("pitch"));
40 int n = p->get_notename ();
42 SCM accs = me->get_object ("accidental-grobs");
43 SCM key = scm_from_int (n);
44 SCM entry = scm_assq (key, accs);
45 if (entry == SCM_BOOL_F)
48 entry = scm_cdr (entry);
50 entry = scm_cons (a->self_scm (), entry);
52 accs = scm_assq_set_x (accs, key, entry);
54 me->set_object ("accidental-grobs", accs);
58 Split into break reminders.
61 Accidental_placement::split_accidentals (Grob *accs,
62 vector<Grob*> *break_reminder,
63 vector<Grob*> *real_acc)
65 for (SCM acs = accs->get_object ("accidental-grobs"); scm_is_pair (acs);
67 for (SCM s = scm_cdar (acs); scm_is_pair (s); s = scm_cdr (s))
69 Grob *a = unsmob_grob (scm_car (s));
71 if (unsmob_grob (a->get_object ("tie")))
72 break_reminder->push_back (a);
74 real_acc->push_back (a);
79 Accidentals are special, because they appear and disappear after
83 Accidental_placement::get_relevant_accidental_extent (Grob *me,
88 vector<Grob*> *which = 0;
90 Accidental_placement::split_accidentals (me, &br, &ra);
93 if (dynamic_cast<Item *> (left_object)->break_status_dir () == RIGHT)
99 for (vsize i = 0; i < which->size (); i++)
100 extent.unite (which->at (i)->extent (item_col, X_AXIS));
102 if (!extent.is_empty ())
104 Real p = robust_scm2double (me->get_property ("left-padding"), 0.2);
111 struct Accidental_placement_entry
113 vector<Skyline_entry> left_skyline_;
114 vector<Skyline_entry> right_skyline_;
115 Interval vertical_extent_;
116 vector<Box> extents_;
117 vector<Grob*> grobs_;
120 Accidental_placement_entry ()
127 static Interval all_accidental_vertical_extent;
128 Real ape_priority (Accidental_placement_entry const *a)
130 return a->vertical_extent_[UP];
133 int ape_compare (Accidental_placement_entry *const &a,
134 Accidental_placement_entry *const &b)
136 return sign (ape_priority (a) - ape_priority (b));
139 bool ape_less (Accidental_placement_entry *const &a,
140 Accidental_placement_entry *const &b)
142 return ape_priority (a) < ape_priority (b);
145 int ape_rcompare (Accidental_placement_entry *const &a,
146 Accidental_placement_entry *const &b)
148 return -sign (ape_priority (a) - ape_priority (b));
160 stagger_apes (vector<Accidental_placement_entry*> *apes)
162 vector<Accidental_placement_entry*> asc = *apes;
164 vector_sort (asc, &ape_less);
169 for (vsize i = 0; i < asc.size ();)
171 Accidental_placement_entry *a = 0;
188 This routine computes placements of accidentals. During
189 add_accidental (), accidentals are already grouped by note, so that
190 octaves are placed above each other; they form columns. Then the
191 columns are sorted: the biggest columns go closest to the note.
192 Then the columns are spaced as closely as possible (using skyline
196 TODO: more advanced placement. Typically, the accs should be placed
197 to form a C shape, like this
206 The naturals should be left of the C as well; they should
209 Note that this placement problem looks NP hard, so we just use a
210 simple strategy, not an optimal choice.
214 TODO: there should be more space in the following situation
228 MAKE_SCHEME_CALLBACK(Accidental_placement, calc_positioning_done, 1);
230 Accidental_placement::calc_positioning_done (SCM smob)
232 Grob *me = unsmob_grob (smob);
236 SCM accs = me->get_object ("accidental-grobs");
237 if (!scm_is_pair (accs))
241 TODO: there is a bug in this code. If two accs are on the same
242 Y-position, they share an Ape, and will be printed in overstrike.
244 vector<Accidental_placement_entry*> apes;
245 for (SCM s = accs; scm_is_pair (s); s = scm_cdr (s))
247 Accidental_placement_entry *ape = new Accidental_placement_entry;
248 ape->notename_ = scm_to_int (scm_caar (s));
250 for (SCM t = scm_cdar (s); scm_is_pair (t); t = scm_cdr (t))
251 ape->grobs_.push_back (unsmob_grob (scm_car (t)));
253 apes.push_back (ape);
256 Grob *common[] = {me, 0};
259 First we must extract *all* pointers. We can only determine
260 extents if we're sure that we've found the right common refpoint
262 vector<Grob*> note_cols, heads;
263 for (vsize i = apes.size (); i--;)
265 Accidental_placement_entry *ape = apes[i];
266 for (vsize j = ape->grobs_.size (); j--;)
268 Grob *a = ape->grobs_[j];
271 common[Y_AXIS] = common[Y_AXIS]->common_refpoint (a, Y_AXIS);
275 Grob *head = a->get_parent (Y_AXIS);
277 Grob *col = head->get_parent (X_AXIS);
278 if (Note_column::has_interface (col))
279 note_cols.push_back (col);
281 heads.push_back (head);
286 This is a little kludgy: to get all notes, we look if there are
289 for (vsize i = note_cols.size (); i--;)
291 Grob *c = note_cols[i]->get_parent (X_AXIS);
292 if (Note_collision_interface::has_interface (c))
294 extract_grob_set (c, "elements", gs);
296 concat (note_cols, gs);
300 for (vsize i = note_cols.size (); i--;)
301 concat (heads, extract_grob_array (note_cols[i], "note-heads"));
303 vector_sort (heads, less<Grob*> ());
305 common[Y_AXIS] = common_refpoint_of_array (heads, common[Y_AXIS], Y_AXIS);
307 for (vsize i = apes.size (); i--;)
309 Accidental_placement_entry *ape = apes[i];
310 ape->left_skyline_ = empty_skyline (LEFT);
311 ape->right_skyline_ = empty_skyline (RIGHT);
313 for (vsize j = apes[i]->grobs_.size (); j--;)
315 Grob *a = apes[i]->grobs_[j];
317 vector<Box> boxes = Accidental_interface::accurate_boxes (a, common);
319 ape->extents_.insert (ape->extents_.end (), boxes.begin (), boxes.end ());
320 for (vsize j = boxes.size (); j--;)
322 insert_extent_into_skyline (&ape->left_skyline_, boxes[j], Y_AXIS, LEFT);
323 insert_extent_into_skyline (&ape->right_skyline_, boxes[j], Y_AXIS, RIGHT);
329 for (vsize i = apes.size (); i--;)
333 for (vsize j = apes[i]->extents_.size (); j--;)
334 y.unite (apes[i]->extents_[j][Y_AXIS]);
335 apes[i]->vertical_extent_ = y;
338 all_accidental_vertical_extent = total;
339 stagger_apes (&apes);
341 Accidental_placement_entry *head_ape = new Accidental_placement_entry;
342 common[X_AXIS] = common_refpoint_of_array (heads, common[X_AXIS], X_AXIS);
343 vector<Skyline_entry> head_skyline (empty_skyline (LEFT));
345 vector<Box> head_extents;
346 for (vsize i = heads.size (); i--;)
348 Box b (heads[i]->extent (common[X_AXIS], X_AXIS),
349 heads[i]->extent (common[Y_AXIS], Y_AXIS));
351 insert_extent_into_skyline (&head_skyline, b, Y_AXIS, LEFT);
354 vector<Grob *> stems;
355 for (vsize i = 0; i < heads.size (); i++)
357 if (Grob *s = Rhythmic_head::get_stem (heads[i]))
361 vector_sort (stems, less<Grob*> ());
363 for (vsize i = 0; i < stems.size (); i ++)
365 int very_large = INT_MAX;
367 Box b (heads[i]->extent (common[X_AXIS], X_AXIS),
368 heads[i]->pure_height (common[Y_AXIS], 0, very_large));
370 insert_extent_into_skyline (&head_skyline, b, Y_AXIS, LEFT);
373 head_ape->left_skyline_ = head_skyline;
374 head_ape->offset_ = 0.0;
376 Real padding = robust_scm2double (me->get_property ("padding"), 0.2);
378 vector<Skyline_entry> left_skyline = head_ape->left_skyline_;
379 heighten_skyline (&left_skyline,
380 -robust_scm2double (me->get_property ("right-padding"), 0));
382 Add accs entries right-to-left.
384 for (vsize i = apes.size (); i-- > 0;)
387 = -skyline_meshing_distance (apes[i]->right_skyline_, left_skyline);
389 offset = (i < apes.size () - 1) ? apes[i + 1]->offset_ : 0.0;
393 apes[i]->offset_ = offset;
395 vector<Skyline_entry> new_left_skyline = apes[i]->left_skyline_;
396 heighten_skyline (&new_left_skyline, apes[i]->offset_);
397 merge_skyline (&new_left_skyline, left_skyline, LEFT);
398 left_skyline = new_left_skyline;
401 for (vsize i = apes.size (); i--;)
403 Accidental_placement_entry *ape = apes[i];
404 for (vsize j = ape->grobs_.size (); j--;)
405 ape->grobs_[j]->translate_axis (ape->offset_, X_AXIS);
408 Interval left_extent, right_extent;
409 Accidental_placement_entry *ape = apes[0];
411 for (vsize i = ape->extents_.size (); i--;)
412 left_extent.unite (ape->offset_ + ape->extents_[i][X_AXIS]);
415 for (vsize i = ape->extents_.size (); i--;)
416 right_extent.unite (ape->offset_ + ape->extents_[i][X_AXIS]);
418 left_extent[LEFT] -= robust_scm2double (me->get_property ("left-padding"), 0);
419 Interval width (left_extent[LEFT], right_extent[RIGHT]);
421 SCM scm_width = ly_interval2scm (width);
422 me->flush_extent_cache (X_AXIS);
423 me->set_property ("X-extent", scm_width);
425 for (vsize i = apes.size (); i--;)
431 ADD_INTERFACE (Accidental_placement,
432 "accidental-placement-interface",
433 "Resolve accidental collisions.",