2 accidental-placement.cc -- implement Accidental_placement
4 source file of the GNU LilyPond music typesetter
6 (c) 2002--2005 Han-Wen Nienhuys <hanwen@cs.uu.nl>
11 #include "accidental-placement.hh"
16 #include "note-column.hh"
17 #include "pointer-group-interface.hh"
18 #include "note-collision.hh"
19 #include "accidental-interface.hh"
21 MAKE_SCHEME_CALLBACK (Accidental_placement, alignment_callback, 2);
23 Accidental_placement::alignment_callback (SCM s, SCM)
25 Grob *me = unsmob_grob (s);
27 Grob *par = me->get_parent (X_AXIS);
28 if (!to_boolean (par->get_property ("positioning-done")))
30 par->set_property ("positioning-done", SCM_BOOL_T);
31 position_accidentals (par);
34 return scm_from_int (0);
38 Accidental_placement::add_accidental (Grob *me, Grob *a)
40 a->set_parent (me, X_AXIS);
41 a->add_offset_callback (alignment_callback_proc, X_AXIS);
42 SCM cause = a->get_parent (Y_AXIS)->get_property ("cause");
44 Music *mcause = unsmob_music (cause);
47 programming_error ("note head has no music cause");
51 Pitch *p = unsmob_pitch (mcause->get_property ("pitch"));
53 int n = p->get_notename ();
55 SCM accs = me->get_object ("accidental-grobs");
56 SCM key = scm_from_int (n);
57 SCM entry = scm_assq (key, accs);
58 if (entry == SCM_BOOL_F)
61 entry = scm_cdr (entry);
63 entry = scm_cons (a->self_scm (), entry);
65 accs = scm_assq_set_x (accs, key, entry);
67 me->set_object ("accidental-grobs", accs);
71 Split into break reminders.
74 Accidental_placement::split_accidentals (Grob *accs,
75 Link_array<Grob> *break_reminder,
76 Link_array<Grob> *real_acc)
78 for (SCM acs = accs->get_object ("accidental-grobs"); scm_is_pair (acs);
80 for (SCM s = scm_cdar (acs); scm_is_pair (s); s = scm_cdr (s))
82 Grob *a = unsmob_grob (scm_car (s));
84 if (unsmob_grob (a->get_object ("tie")))
85 break_reminder->push (a);
92 Accidentals are special, because they appear and disappear after
96 Accidental_placement::get_relevant_accidental_extent (Grob *me,
100 Link_array<Grob> br, ra;
101 Link_array<Grob> *which = 0;
103 Accidental_placement::split_accidentals (me, &br, &ra);
106 if (dynamic_cast<Item *> (left_object)->break_status_dir () == RIGHT)
112 for (int i = 0; i < which->size (); i++)
113 extent.unite (which->elem (i)->extent (item_col, X_AXIS));
115 if (!extent.is_empty ())
117 Real p = robust_scm2double (me->get_property ("left-padding"), 0.2);
124 struct Accidental_placement_entry
126 Array<Skyline_entry> left_skyline_;
127 Array<Skyline_entry> right_skyline_;
128 Interval vertical_extent_;
130 Link_array<Grob> grobs_;
133 Accidental_placement_entry ()
140 static Interval all_accidental_vertical_extent;
141 Real ape_priority (Accidental_placement_entry const *a)
143 return a->vertical_extent_[UP];
146 int ape_compare (Accidental_placement_entry *const &a,
147 Accidental_placement_entry *const &b)
149 return sign (ape_priority (a) - ape_priority (b));
152 int ape_rcompare (Accidental_placement_entry *const &a,
153 Accidental_placement_entry *const &b)
155 return -sign (ape_priority (a) - ape_priority (b));
167 stagger_apes (Link_array<Accidental_placement_entry> *apes)
169 Link_array<Accidental_placement_entry> asc = *apes;
171 asc.sort (&ape_compare);
177 while (i < asc.size ())
179 Accidental_placement_entry *a = 0;
193 This routine computes placements of accidentals. During
194 add_accidental (), accidentals are already grouped by note, so that
195 octaves are placed above each other; they form columns. Then the
196 columns are sorted: the biggest columns go closest to the note.
197 Then the columns are spaced as closely as possible (using skyline
201 TODO: more advanced placement. Typically, the accs should be placed
202 to form a C shape, like this
211 The naturals should be left of the C as well; they should
214 Note that this placement problem looks NP hard, so we just use a
215 simple strategy, not an optimal choice.
219 TODO: there should be more space in the following situation
230 Accidental_placement::position_accidentals (Grob *me)
233 return SCM_UNSPECIFIED;
235 SCM accs = me->get_object ("accidental-grobs");
236 if (!scm_is_pair (accs))
237 return SCM_UNSPECIFIED;
240 TODO: there is a bug in this code. If two accs are on the same
241 Y-position, they share an Ape, and will be printed in overstrike.
243 Link_array<Accidental_placement_entry> apes;
244 for (SCM s = accs; scm_is_pair (s); s = scm_cdr (s))
246 Accidental_placement_entry *ape = new Accidental_placement_entry;
247 ape->notename_ = scm_to_int (scm_caar (s));
249 for (SCM t = scm_cdar (s); scm_is_pair (t); t = scm_cdr (t))
250 ape->grobs_.push (unsmob_grob (scm_car (t)));
255 Grob *common[] = {me, 0};
258 First we must extract *all* pointers. We can only determine
259 extents if we're sure that we've found the right common refpoint
261 Link_array<Grob> note_cols, heads;
262 for (int i = apes.size (); i--;)
264 Accidental_placement_entry *ape = apes[i];
265 for (int j = ape->grobs_.size (); j--;)
267 Grob *a = ape->grobs_[j];
270 common[Y_AXIS] = common[Y_AXIS]->common_refpoint (a, Y_AXIS);
274 Grob *head = a->get_parent (Y_AXIS);
276 Grob *col = head->get_parent (X_AXIS);
277 if (Note_column::has_interface (col))
278 note_cols.push (col);
285 This is a little kludgy: to get all notes, we look if there are
288 for (int i = note_cols.size (); i--;)
290 Grob *c = note_cols[i]->get_parent (X_AXIS);
291 if (Note_collision_interface::has_interface (c))
293 extract_grob_set (c, "elements", gs);
295 note_cols.concat (gs);
299 for (int i = note_cols.size (); i--;)
300 heads.concat (extract_grob_array (note_cols[i], "note-heads"));
302 heads.default_sort ();
304 common[Y_AXIS] = common_refpoint_of_array (heads, common[Y_AXIS], Y_AXIS);
306 for (int i = apes.size (); i--;)
308 Accidental_placement_entry *ape = apes[i];
309 ape->left_skyline_ = empty_skyline (LEFT);
310 ape->right_skyline_ = empty_skyline (RIGHT);
312 for (int j = apes[i]->grobs_.size (); j--;)
314 Grob *a = apes[i]->grobs_[j];
316 Array<Box> boxes = Accidental_interface::accurate_boxes (a, common);
318 ape->extents_.concat (boxes);
319 for (int j = boxes.size (); j--;)
321 insert_extent_into_skyline (&ape->left_skyline_, boxes[j], Y_AXIS, LEFT);
322 insert_extent_into_skyline (&ape->right_skyline_, boxes[j], Y_AXIS, RIGHT);
328 for (int i = apes.size (); i--;)
332 for (int j = apes[i]->extents_.size (); j--;)
333 y.unite (apes[i]->extents_[j][Y_AXIS]);
334 apes[i]->vertical_extent_ = y;
337 all_accidental_vertical_extent = total;
338 stagger_apes (&apes);
340 Accidental_placement_entry *head_ape = new Accidental_placement_entry;
341 common[X_AXIS] = common_refpoint_of_array (heads, common[X_AXIS], X_AXIS);
342 Array<Skyline_entry> head_skyline (empty_skyline (LEFT));
343 Array<Box> head_extents;
344 for (int i = heads.size (); i--;)
346 Box b (heads[i]->extent (common[X_AXIS], X_AXIS),
347 heads[i]->extent (common[Y_AXIS], Y_AXIS));
349 insert_extent_into_skyline (&head_skyline, b, Y_AXIS, LEFT);
352 head_ape->left_skyline_ = head_skyline;
353 head_ape->offset_ = 0.0;
355 Real padding = robust_scm2double (me->get_property ("padding"), 0.2);
357 Array<Skyline_entry> left_skyline = head_ape->left_skyline_;
358 heighten_skyline (&left_skyline,
359 -robust_scm2double (me->get_property ("right-padding"), 0));
361 Add accs entries right-to-left.
363 for (int i = apes.size (); i-- > 0;)
366 = -skyline_meshing_distance (apes[i]->right_skyline_, left_skyline);
368 offset = (i < apes.size () - 1) ? apes[i + 1]->offset_ : 0.0;
372 apes[i]->offset_ = offset;
374 Array<Skyline_entry> new_left_skyline = apes[i]->left_skyline_;
375 heighten_skyline (&new_left_skyline, apes[i]->offset_);
376 merge_skyline (&new_left_skyline, left_skyline, LEFT);
377 left_skyline = new_left_skyline;
380 for (int i = apes.size (); i--;)
382 Accidental_placement_entry *ape = apes[i];
383 for (int j = ape->grobs_.size (); j--;)
384 ape->grobs_[j]->translate_axis (ape->offset_, X_AXIS);
387 Interval left_extent, right_extent;
388 Accidental_placement_entry *ape = apes[0];
390 for (int i = ape->extents_.size (); i--;)
391 left_extent.unite (ape->offset_ + ape->extents_[i][X_AXIS]);
394 for (int i = ape->extents_.size (); i--;)
395 right_extent.unite (ape->offset_ + ape->extents_[i][X_AXIS]);
397 left_extent[LEFT] -= robust_scm2double (me->get_property ("left-padding"), 0);
398 Interval width (left_extent[LEFT], right_extent[RIGHT]);
400 SCM scm_width = ly_interval2scm (width);
401 me->set_extent (scm_width, X_AXIS);
403 for (int i = apes.size (); i--;)
406 return SCM_UNSPECIFIED;
409 ADD_INTERFACE (Accidental_placement,
410 "accidental-placement-interface",
411 "Resolve accidental collisions.",
412 "left-padding padding right-padding accidental-grobs positioning-done")