2 collision.cc -- implement Collision
4 source file of the GNU LilyPond music typesetter
6 (c) 1997--2007 Han-Wen Nienhuys <hanwen@xs4all.nl>
9 #include "note-collision.hh"
11 #include "axis-group-interface.hh"
12 #include "dot-column.hh"
13 #include "international.hh"
14 #include "note-column.hh"
15 #include "note-head.hh"
16 #include "output-def.hh"
17 #include "pointer-group-interface.hh"
19 #include "rhythmic-head.hh"
20 #include "staff-symbol-referencer.hh"
21 #include "side-position-interface.hh"
27 check_meshing_chords (Grob *me,
28 Drul_array<vector<Real> > *offsets,
29 Drul_array<vector<Slice> > const &extents,
30 Drul_array<vector<Grob*> > const &clash_groups)
33 if (!extents[UP].size () || ! extents[DOWN].size ())
36 Grob *clash_up = clash_groups[UP][0];
37 Grob *clash_down = clash_groups[DOWN][0];
39 /* Every note column should have a stem, but avoid a crash. */
40 if (!Note_column::get_stem (clash_up) || !Note_column::get_stem (clash_down))
43 Drul_array<Grob*> stems (Note_column::get_stem (clash_down),
44 Note_column::get_stem (clash_up));
46 Grob *head_up = Note_column::first_head (clash_up);
47 Grob *head_down = Note_column::first_head (clash_down);
49 vector<int> ups = Stem::note_head_positions (Note_column::get_stem (clash_up));
50 vector<int> dps = Stem::note_head_positions (Note_column::get_stem (clash_down));
52 /* Too far apart to collide. */
53 if (ups[0] > dps.back () + 1)
56 /* Merge heads if the notes lie the same line, or if the "stem-up-note" is
57 above the "stem-down-note". */
58 bool merge_possible = (ups[0] >= dps[0]) && (ups.back () >= dps.back ());
60 /* Do not merge notes typeset in different style. */
61 if (!ly_is_equal (head_up->get_property ("style"),
62 head_down->get_property ("style")))
63 merge_possible = false;
65 int up_ball_type = Rhythmic_head::duration_log (head_up);
66 int down_ball_type = Rhythmic_head::duration_log (head_down);
68 /* Do not merge whole notes (or longer, like breve, longa, maxima). */
69 if (merge_possible && (up_ball_type <= 0 || down_ball_type <= 0))
70 merge_possible = false;
73 && Rhythmic_head::dot_count (head_up) != Rhythmic_head::dot_count (head_down)
74 && !to_boolean (me->get_property ("merge-differently-dotted")))
75 merge_possible = false;
77 /* Can only merge different heads if merge-differently-headed is
80 && up_ball_type != down_ball_type
81 && !to_boolean (me->get_property ("merge-differently-headed")))
82 merge_possible = false;
84 /* what's this for? In particular, why do we check merge_possible when we
85 haven't finished determining it yet? --jneem */
87 && head_up->get_property ("style") == ly_symbol2scm ("fa")
88 && head_down->get_property ("style") == ly_symbol2scm ("fa"))
90 Interval uphead_size = head_up->extent (head_up, Y_AXIS);
91 Offset att = Offset (0.0, -1.0);
92 head_up->set_property ("stem-attachment", ly_offset2scm (att));
93 head_up->set_property ("transparent", SCM_BOOL_T);
96 /* Should never merge quarter and half notes, as this would make
97 them indistinguishable. */
99 && ((Stem::duration_log (stems[UP]) == 1
100 && Stem::duration_log (stems[DOWN]) == 2)
101 || (Stem::duration_log (stems[UP]) == 2
102 && Stem::duration_log (stems[DOWN]) == 1)))
103 merge_possible = false;
106 this case (distant half collide),
113 the noteheads may be closer than this case (close half collide)
124 /* TODO: filter out the 'o's in this configuration, since they're no
125 part in the collision.
134 bool close_half_collide = false;
135 bool distant_half_collide = false;
136 bool full_collide = false;
138 for (vsize i = 0, j = 0; i < ups.size () && j < dps.size (); )
140 if (abs (ups[i] - dps[j]) == 1)
142 merge_possible = false;
144 close_half_collide = true;
146 distant_half_collide = true;
148 else if (ups[i] == dps[j])
150 else if (ups[i] > dps[0] && ups[i] < dps.back ())
151 merge_possible = false;
152 else if (dps[j] > ups[0] && dps[j] < ups.back ())
153 merge_possible = false;
157 else if (ups[i] > dps[j])
166 full_collide = full_collide || (close_half_collide
167 && distant_half_collide);
169 Drul_array<Real> center_note_shifts;
170 center_note_shifts[LEFT] = 0.0;
171 center_note_shifts[RIGHT] = 0.0;
173 Real shift_amount = 1;
175 bool touch = (ups[0] >= dps.back ());
179 /* For full collisions, the right hand head may obscure dots, so
180 make sure the dotted heads go to the right. */
181 bool stem_to_stem = false;
184 if (Rhythmic_head::dot_count (head_up) > Rhythmic_head::dot_count (head_down))
186 else if (Rhythmic_head::dot_count (head_up) < Rhythmic_head::dot_count (head_down))
194 /* If possible, don't wipe any heads. Else, wipe shortest head,
195 or head with smallest amount of dots. Note: when merging
196 different heads, dots on the smaller one disappear. */
198 Grob *dot_wipe_head = head_up;
200 if (up_ball_type == down_ball_type)
202 if (Rhythmic_head::dot_count (head_down) < Rhythmic_head::dot_count (head_up))
204 wipe_ball = head_down;
205 dot_wipe_head = head_down;
207 else if (Rhythmic_head::dot_count (head_down) > Rhythmic_head::dot_count (head_up))
209 dot_wipe_head = head_up;
213 dot_wipe_head = head_up;
215 else if (down_ball_type > up_ball_type)
217 wipe_ball = head_down;
218 dot_wipe_head = head_down;
220 else if (down_ball_type < up_ball_type)
223 dot_wipe_head = head_up;
228 if (Grob *d = unsmob_grob (dot_wipe_head->get_object ("dot")))
232 if (wipe_ball && wipe_ball->is_live ())
234 wipe_ball->set_property ("transparent", SCM_BOOL_T);
237 /* TODO: these numbers are magic; should devise a set of grob props
238 to tune this behavior. */
239 else if (stem_to_stem)
240 shift_amount = -abs (shift_amount) * 0.65;
241 else if (close_half_collide && !touch)
242 shift_amount *= 0.52;
243 else if (distant_half_collide && !touch)
245 else if (distant_half_collide || close_half_collide || full_collide)
249 else if (Rhythmic_head::dot_count (head_up) || Rhythmic_head::dot_count (head_down))
252 shift_amount *= 0.17;
258 && down_ball_type * up_ball_type == 0)
260 if (up_ball_type == 0 && down_ball_type == 1)
261 shift_amount *= 1.25;
262 else if (up_ball_type == 0 && down_ball_type == 2)
263 shift_amount *= 1.35;
264 else if (down_ball_type == 0 && up_ball_type == 1)
266 else if (down_ball_type == 0 && up_ball_type == 2)
267 shift_amount *= 0.75;
273 * Dots from left note head collide with right note head. Only occurs
274 * with a close half collide, if the left note head is between
275 * lines and the right note head is on a line, and if right note head
276 * hasn't got any dots.
278 if (close_half_collide
279 && Rhythmic_head::dot_count (head_up)
280 && !Rhythmic_head::dot_count (head_down))
282 Grob *staff = Staff_symbol_referencer::get_staff_symbol (me);
283 if (!Staff_symbol_referencer::on_line (staff, ups[0]))
285 TODO: consider junking the else body.
287 if (to_boolean (me->get_property ("prefer-dotted-right")))
293 Grob *d = unsmob_grob (head_up->get_object ("dot"));
294 Grob *parent = d->get_parent (X_AXIS);
295 if (Dot_column::has_interface (parent))
296 Side_position_interface::add_support (parent, head_down);
300 /* For full or close half collisions, the right hand head may
301 obscure dots. Move dots to the right. */
302 if (abs (shift_amount) > 1e-6
303 && Rhythmic_head::dot_count (head_down) > Rhythmic_head::dot_count (head_up)
304 && (full_collide || close_half_collide))
306 Grob *d = unsmob_grob (head_down->get_object ("dot"));
307 Grob *parent = d->get_parent (X_AXIS);
317 the . is put right of o which is erroneous o force-shifted
320 if (Dot_column::has_interface (parent))
322 Grob *stem = unsmob_grob (head_up->get_object ("stem"));
323 extract_grob_set (stem, "note-heads", heads);
324 for (vsize i = 0; i < heads.size (); i++)
325 Side_position_interface::add_support (parent, heads[i]);
332 for (vsize i = 0; i < clash_groups[d].size (); i++)
333 (*offsets)[d][i] += d * shift_amount;
335 while ((flip (&d)) != UP);
339 MAKE_SCHEME_CALLBACK (Note_collision_interface, calc_positioning_done, 1)
341 Note_collision_interface::calc_positioning_done (SCM smob)
343 Grob *me = unsmob_grob (smob);
344 me->set_property ("positioning-done", SCM_BOOL_T);
346 Drul_array<vector<Grob*> > clash_groups = get_clash_groups (me);
351 for (vsize i = clash_groups[d].size (); i--; )
356 clash_groups[d][i]->extent (me, X_AXIS);
359 while (flip (&d) != UP);
361 SCM autos (automatic_shift (me, clash_groups));
362 SCM hand (forced_shift (me));
367 if (clash_groups[d].size ())
369 Grob *h = clash_groups[d][0];
370 Grob *fh = Note_column::first_head (h);
372 wid = fh->extent (h, X_AXIS).length ();
375 while (flip (&d) != UP);
378 Real left_most = 1e6;
380 vector<Real> amounts;
381 for (; scm_is_pair (hand); hand = scm_cdr (hand))
383 Grob *s = unsmob_grob (scm_caar (hand));
384 Real amount = scm_to_double (scm_cdar (hand)) * wid;
387 amounts.push_back (amount);
388 if (amount < left_most)
391 for (; scm_is_pair (autos); autos = scm_cdr (autos))
393 Grob *s = unsmob_grob (scm_caar (autos));
394 Real amount = scm_to_double (scm_cdar (autos)) * wid;
396 vsize x = find (done, s) - done.begin ();
397 if (x == VPOS || x >= done.size ())
400 amounts.push_back (amount);
401 if (amount < left_most)
406 for (vsize i = 0; i < amounts.size (); i++)
407 done[i]->translate_axis (amounts[i] - left_most, X_AXIS);
412 Drul_array < vector<Grob*> >
413 Note_collision_interface::get_clash_groups (Grob *me)
415 Drul_array<vector<Grob*> > clash_groups;
417 extract_grob_set (me, "elements", elements);
418 for (vsize i = 0; i < elements.size (); i++)
420 Grob *se = elements[i];
421 if (Note_column::has_interface (se))
423 if (!Note_column::dir (se))
425 se->programming_error ("note-column has no direction");
428 clash_groups[Note_column::dir (se)].push_back (se);
435 vector<Grob*> &clashes (clash_groups[d]);
436 vector_sort (clashes, Note_column::shift_less);
438 while ((flip (&d)) != UP);
443 /** This complicated routine moves note columns around horizontally to
444 ensure that notes don't clash.
448 Note_collision_interface::automatic_shift (Grob *me,
449 Drul_array<vector<Grob*> > clash_groups)
451 Drul_array < vector<int> > shifts;
457 vector<int> &shift (shifts[d]);
458 vector<Grob*> &clashes (clash_groups[d]);
460 for (vsize i = 0; i < clashes.size (); i++)
463 = clashes[i]->get_property ("horizontal-shift");
465 if (scm_is_number (sh))
466 shift.push_back (scm_to_int (sh));
471 for (vsize i = 1; i < shift.size (); i++)
473 if (shift[i - 1] == shift[i])
475 clashes[0]->warning (_ ("ignoring too many clashing note columns"));
480 while ((flip (&d)) != UP);
482 Drul_array<vector<Slice> > extents;
483 Drul_array<vector<Real> > offsets;
487 for (vsize i = 0; i < clash_groups[d].size (); i++)
489 Slice s (Note_column::head_positions_interval (clash_groups[d][i]));
492 extents[d].push_back (s);
493 offsets[d].push_back (d * 0.5 * i);
496 while ((flip (&d)) != UP);
499 do horizontal shifts of each direction
509 for (vsize i = 1; i < clash_groups[d].size (); i++)
511 Slice prev = extents[d][i - 1];
512 prev.intersect (extents[d][i]);
513 if (prev.length () > 0
514 || (extents[-d].size () && d * (extents[d][i][-d] - extents[-d][0][d]) < 0))
515 for (vsize j = i; j < clash_groups[d].size (); j++)
516 offsets[d][j] += d * 0.5;
519 while ((flip (&d)) != UP);
523 see input/regression/dot-up-voice-collision.ly
525 for (vsize i = 0; i < clash_groups[UP].size (); i++)
527 Grob *g = clash_groups[UP][i];
528 Grob *dc = Note_column::dot_column (g);
531 for (vsize j = i + 1; j < clash_groups[UP].size (); j++)
533 Grob *stem = Note_column::get_stem (clash_groups[UP][j]);
534 Side_position_interface::add_support (dc, stem);
539 Check if chords are meshing
542 check_meshing_chords (me, &offsets, extents, clash_groups);
546 for (vsize i = 0; i < clash_groups[d].size (); i++)
547 tups = scm_cons (scm_cons (clash_groups[d][i]->self_scm (),
548 scm_from_double (offsets[d][i])),
551 while (flip (&d) != UP);
557 Note_collision_interface::forced_shift (Grob *me)
561 extract_grob_set (me, "elements", elements);
562 for (vsize i = 0; i < elements.size (); i++)
564 Grob *se = elements[i];
566 SCM force = se->get_property ("force-hshift");
567 if (scm_is_number (force))
569 tups = scm_cons (scm_cons (se->self_scm (), force),
577 Note_collision_interface::add_column (Grob *me, Grob *ncol)
579 ncol->set_property ("X-offset", Grob::x_parent_positioning_proc);
580 Axis_group_interface::add_element (me, ncol);
583 ADD_INTERFACE (Note_collision_interface,
584 "An object that handles collisions between notes with"
585 " different stem directions and horizontal shifts. Most of"
586 " the interesting properties are to be set in"
587 " @ref{note-column-interface}: these are @code{force-hshift}"
588 " and @code{horizontal-shift}.",
591 "merge-differently-dotted "
592 "merge-differently-headed "
594 "prefer-dotted-right "