2 spacing-spanner.cc -- implement Spacing_spanner
4 source file of the GNU LilyPond music typesetter
6 (c) 1999--2007 Han-Wen Nienhuys <hanwen@xs4all.nl>
9 #include "spacing-spanner.hh"
14 #include "spacing-options.hh"
15 #include "international.hh"
18 #include "note-spacing.hh"
19 #include "output-def.hh"
20 #include "paper-column.hh"
21 #include "paper-score.hh"
22 #include "pointer-group-interface.hh"
23 #include "separation-item.hh"
24 #include "spaceable-grob.hh"
25 #include "spacing-interface.hh"
26 #include "staff-spacing.hh"
31 Spacing_spanner::get_columns (Grob *me_grob)
33 Spanner *me = dynamic_cast<Spanner*> (me_grob);
34 vector<Grob*> all (get_root_system (me)->used_columns ());
35 vsize start = binary_search (all, (Grob*)me->get_bound (LEFT),
36 &Paper_column::less_than);
37 vsize end = binary_search (all, (Grob*) me->get_bound (RIGHT),
38 &Paper_column::less_than);
40 all = vector<Grob*>::vector<Grob*> (all.begin () + start,
41 all.begin () + end + 1);
45 MAKE_SCHEME_CALLBACK (Spacing_spanner, set_springs, 1);
47 Spacing_spanner::set_springs (SCM smob)
49 Spanner *me = unsmob_spanner (smob);
52 can't use get_system () ? --hwn.
54 Spacing_options options;
55 options.init_from_grob (me);
56 vector<Grob*> cols = Spacing_spanner::get_columns (me);
57 set_explicit_neighbor_columns (cols);
59 prune_loose_columns (me, &cols, &options);
60 set_implicit_neighbor_columns (cols);
61 generate_springs (me, cols, &options);
63 return SCM_UNSPECIFIED;
67 We want the shortest note that is also "common" in the piece, so we
68 find the shortest in each measure, and take the most frequently
71 This probably gives weird effects with modern music, where every
72 note has a different duration, but hey, don't write that kind of
76 MAKE_SCHEME_CALLBACK (Spacing_spanner, calc_common_shortest_duration, 1);
78 Spacing_spanner::calc_common_shortest_duration (SCM grob)
80 Spanner *me = unsmob_spanner (grob);
82 vector<Grob*> cols (get_columns (me));
87 vector<Rational> durations;
90 Rational shortest_in_measure;
91 shortest_in_measure.set_infinite (1);
93 for (vsize i = 0; i < cols.size (); i++)
95 if (Paper_column::is_musical (cols[i]))
97 Moment *when = unsmob_moment (cols[i]->get_property ("when"));
100 ignore grace notes for shortest notes.
102 if (when && when->grace_part_)
105 SCM st = cols[i]->get_property ("shortest-starter-duration");
106 Moment this_shortest = *unsmob_moment (st);
107 assert (this_shortest.to_bool ());
108 shortest_in_measure = min (shortest_in_measure, this_shortest.main_part_);
110 else if (!shortest_in_measure.is_infinity ()
111 && Paper_column::is_breakable (cols[i]))
114 for (; j < durations.size (); j++)
116 if (durations[j] > shortest_in_measure)
118 counts.insert (counts.begin () + j, 1);
119 durations.insert (durations.begin () + j, shortest_in_measure);
122 else if (durations[j] == shortest_in_measure)
129 if (durations.size () == j)
131 durations.push_back (shortest_in_measure);
132 counts.push_back (1);
135 shortest_in_measure.set_infinite (1);
141 for (vsize i = durations.size (); i--;)
143 if (counts[i] >= max_count)
146 max_count = counts[i];
150 SCM bsd = me->get_property ("base-shortest-duration");
151 Rational d = Rational (1, 8);
152 if (Moment *m = unsmob_moment (bsd))
156 d = min (d, durations[max_idx]);
158 return Moment (d).smobbed_copy ();
162 Spacing_spanner::generate_pair_spacing (Grob *me,
163 Paper_column *left_col, Paper_column *right_col,
164 Paper_column *after_right_col,
165 Spacing_options const *options)
167 if (Paper_column::is_musical (left_col))
169 if (!Paper_column::is_musical (right_col)
170 && options->float_nonmusical_columns_
172 && Paper_column::is_musical (after_right_col))
175 TODO: should generate rods to prevent collisions.
177 musical_column_spacing (me, left_col, after_right_col, options);
178 right_col->set_object ("between-cols", scm_cons (left_col->self_scm (),
179 after_right_col->self_scm ()));
182 musical_column_spacing (me, left_col, right_col, options);
184 if (Item *rb = right_col->find_prebroken_piece (LEFT))
185 musical_column_spacing (me, left_col, rb, options);
190 The case that the right part is broken as well is rather
191 rare, but it is possible, eg. with a single empty measure,
192 or if one staff finishes a tad earlier than the rest.
194 Item *lb = left_col->find_prebroken_piece (RIGHT);
195 Item *rb = right_col->find_prebroken_piece (LEFT);
197 if (left_col && right_col)
198 breakable_column_spacing (me, left_col, right_col, options);
201 breakable_column_spacing (me, lb, right_col, options);
204 breakable_column_spacing (me, left_col, rb, options);
207 breakable_column_spacing (me, lb, rb, options);
212 set_column_rods (vector<Grob*> const &cols, Real padding)
214 /* distances[i] will be the minimum distance between column i and column i+1 */
215 vector<Real> distances;
217 for (vsize i = 1; i < cols.size (); i++)
219 Item *r = dynamic_cast<Item*> (cols[i]);
220 Item *rb = r->find_prebroken_piece (LEFT);
222 if (Separation_item::is_empty (r) && (!rb || Separation_item::is_empty (rb)))
225 Skyline_pair *skys = Skyline_pair::unsmob (r->get_property ("horizontal-skylines"));
226 Real right_stickout = skys ? (*skys)[LEFT].max_height () : 0.0;
228 Drul_array<Item*> r_cols (r, rb);
229 Drul_array<Real> cur_dist (0.0, 0.0);
231 /* This is an inner loop and hence it is potentially quadratic. However, we only continue
232 as long as there is a rod to insert. Therefore, this loop will usually only execute
233 a constant number of times per iteration of the outer loop. */
234 for (vsize j = i; j--;)
236 Item *l = dynamic_cast<Item*> (cols[j]);
237 Item *lb = l->find_prebroken_piece (RIGHT);
238 Skyline_pair *skys = Skyline_pair::unsmob (l->get_property ("horizontal-skylines"));
239 Real left_stickout = skys ? (*skys)[RIGHT].max_height () : 0.0;
246 cur_dist[d] += distances[j];
248 Item *r_col = r_cols[d];
249 bool touches = right_stickout - left_stickout + cur_dist[d] < 0.0;
252 /* we set a distance for the line-starter column even if it's non-broken counterpart
253 doesn't touch the right column. */
255 Separation_item::set_distance (lb, r_col, padding);
257 if (touches || j == i-1)
258 dist = Separation_item::set_distance (l, r_col, padding);
260 if (j == i-1 && d == LEFT)
261 distances.push_back (dist);
264 cur_dist[d] = distances[j];
266 done = done && !touches;
268 while (flip (&d) != LEFT && rb);
270 /* we need the empty check for gregorian notation, where there are a lot of
271 extraneous paper-columns that we need to skip over */
272 if (done && !Separation_item::is_empty (l))
280 Spacing_spanner::generate_springs (Grob *me,
281 vector<Grob*> const &cols,
282 Spacing_options const *options)
284 Paper_column *prev = dynamic_cast<Paper_column*> (cols[0]);
285 for (vsize i = 1; i < cols.size (); i++)
287 Paper_column *col = dynamic_cast<Paper_column *> (cols[i]);
288 Paper_column *next = (i + 1 < cols.size ()) ? dynamic_cast<Paper_column *> (cols[i+1]) : 0;
290 generate_pair_spacing (me, prev, col, next, options);
295 set_column_rods (cols, 0.1); // FIXME: padding
299 Generate the space between two musical columns LEFT_COL and RIGHT_COL.
302 Spacing_spanner::musical_column_spacing (Grob *me,
305 Spacing_options const *options)
307 Real base_note_space = note_spacing (me, left_col, right_col, options);
310 if (options->stretch_uniformly_)
311 spring = Spring (base_note_space, 0.0);
314 vector<Spring> springs;
315 extract_grob_set (left_col, "right-neighbors", neighbors);
317 for (vsize i = 0; i < neighbors.size (); i++)
319 Grob *wish = neighbors[i];
321 Item *wish_rcol = Spacing_interface::right_column (wish);
322 if (Spacing_interface::left_column (wish) != left_col
323 || (wish_rcol != right_col && wish_rcol != right_col->original ()))
327 This is probably a waste of time in the case of polyphonic
329 if (Note_spacing::has_interface (wish))
330 springs.push_back (Note_spacing::get_spacing (wish, right_col, base_note_space, options->increment_));
333 if (springs.empty ())
336 if (!Paper_column::is_musical (right_col))
339 There used to be code that examined left_col->extent
340 (X_AXIS), but this is resulted in unexpected wide
341 spacing, because the width of s^"text" output is also
342 taken into account here.
344 spring = Spring (max (base_note_space, options->increment_),
345 options->increment_);
350 Fixed should be 0.0. If there are no spacing wishes, we're
351 likely dealing with polyphonic spacing of hemiolas.
353 We used to have min_distance_ = options->increment_
355 but this can lead to numeric instability problems when we
358 inverse_strength = (distance_ - min_distance_)
361 spring = Spring (base_note_space, 0.0);
365 spring = merge_springs (springs);
368 if (Paper_column::when_mom (right_col).grace_part_
369 && !Paper_column::when_mom (left_col).grace_part_)
372 Ugh. 0.8 is arbitrary.
378 TODO: make sure that the space doesn't exceed the right margin.
380 if (options->packed_)
383 In packed mode, pack notes as tight as possible. This makes
384 sense mostly in combination with raggedright mode: the notes
385 are then printed at minimum distance. This is mostly useful
386 for ancient notation, but may also be useful for some flavours
387 of contemporary music. If not in raggedright mode, lily will
388 pack as much bars of music as possible into a line, but the
389 line will then be stretched to fill the whole linewidth.
391 spring.set_distance (spring.min_distance ());
392 spring.set_inverse_stretch_strength (1.0);
395 Spaceable_grob::add_spring (left_col, right_col, spring);
399 Check if COL fills the whole measure.
402 Spacing_spanner::fills_measure (Grob *me, Item *left, Item *col)
404 System *sys = get_root_system (me);
405 Item *next = sys->column (col->get_column ()->get_rank () + 1);
409 if (Paper_column::is_musical (next)
410 || Paper_column::is_musical (left)
411 || !Paper_column::is_musical (col)
412 || !Paper_column::is_used (next))
416 Paper_column::when_mom (next) - Paper_column::when_mom (col);
418 Moment *len = unsmob_moment (left->get_property ("measure-length"));
423 Don't check for exact measure length, since ending measures are
424 often shortened due to pickups.
426 if (dt.main_part_ > len->main_part_ / Rational (2)
427 && (next->is_broken ()
428 || next->break_status_dir ()))
435 Read hints from L and generate springs.
438 Spacing_spanner::breakable_column_spacing (Grob *me, Item *l, Item *r,
439 Spacing_options const *options)
441 vector<Spring> springs;
444 Moment dt = Paper_column::when_mom (r) - Paper_column::when_mom (l);
446 if (dt == Moment (0, 0))
448 extract_grob_set (l, "spacing-wishes", wishes);
450 for (vsize i = 0; i < wishes.size (); i++)
452 Item *spacing_grob = dynamic_cast<Item *> (wishes[i]);
454 if (!spacing_grob || !Staff_spacing::has_interface (spacing_grob))
458 column for the left one settings should be ok due automatic
461 assert (spacing_grob->get_column () == l);
463 springs.push_back (Staff_spacing::get_spacing (spacing_grob, r));
467 if (springs.empty ())
468 spring = standard_breakable_column_spacing (me, l, r, options);
470 spring = merge_springs (springs);
472 if (Paper_column::when_mom (r).grace_part_)
475 Correct for grace notes.
477 Ugh. The 0.8 is arbitrary.
482 if (Paper_column::is_musical (r)
483 && l->break_status_dir () == CENTER
484 && fills_measure (me, l, r))
486 spring.set_distance (spring.distance () + 1.0);
487 spring.set_default_strength ();
490 if (options->stretch_uniformly_ && l->break_status_dir () != RIGHT)
492 spring.set_min_distance (0.0);
493 spring.set_default_strength ();
496 Spaceable_grob::add_spring (l, r, spring);
499 ADD_INTERFACE (Spacing_spanner,
500 "The space taken by a note is dependent on its duration. Doubling a\n"
501 "duration adds spacing-increment to the space. The most common shortest\n"
502 "note gets @code{shortest-duration-space}. Notes that are even shorter are\n"
503 "spaced proportonial to their duration.\n"
505 "Typically, the increment is the width of a black note head. In a\n"
506 "piece with lots of 8th notes, and some 16th notes, the eighth note\n"
507 "gets 2 note heads width (i.e. the space following a note is 1 note\n"
508 "head width) A 16th note is followed by 0.5 note head width. The\n"
509 "quarter note is followed by 3 NHW, the half by 4 NHW, etc.\n",
512 "average-spacing-wishes "
513 "base-shortest-duration "
514 "common-shortest-duration "
516 "shortest-duration-space "
518 "strict-grace-spacing "
519 "strict-note-spacing "
520 "uniform-stretching "