2 This file is part of LilyPond, the GNU music typesetter.
4 Copyright (C) 1999--2012 Jan Nieuwenhuizen <janneke@gnu.org>
6 LilyPond is free software: you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation, either version 3 of the License, or
9 (at your option) any later version.
11 LilyPond is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with LilyPond. If not, see <http://www.gnu.org/licenses/>.
20 #include "bar-line.hh"
21 #include "beaming-pattern.hh"
24 #include "context-handle.hh"
25 #include "duration.hh"
26 #include "engraver.hh"
30 #include "stream-event.hh"
34 #include "translator.icc"
36 class Auto_beam_engraver : public Engraver
38 TRANSLATOR_DECLARATIONS (Auto_beam_engraver);
41 void stop_translation_timestep ();
42 void process_music ();
43 virtual void finalize ();
44 virtual void derived_mark () const;
46 DECLARE_ACKNOWLEDGER (rest);
47 DECLARE_ACKNOWLEDGER (beam);
48 DECLARE_ACKNOWLEDGER (bar_line);
49 DECLARE_ACKNOWLEDGER (breathing_sign);
50 DECLARE_ACKNOWLEDGER (stem);
51 DECLARE_TRANSLATOR_LISTENER (beam_forbid);
53 void process_acknowledged ();
56 bool test_moment (Direction, Moment, Moment);
57 void consider_begin (Moment, Moment);
58 void consider_end (Moment, Moment);
59 Spanner *create_beam ();
63 bool is_same_grace_state (Grob *e);
66 vector<Item *> *remove_end_stems (vsize);
68 Stream_event *forbid_;
70 shortest_mom_ is the shortest note in the beam.
73 Spanner *finished_beam_;
74 vector<Item *> *stems_;
76 int process_acknowledged_count_;
79 Projected ending of the beam we're working on.
82 Moment beam_start_moment_;
83 Moment beam_start_location_;
85 Handle on the starting staff keeps it alive until beam is comlete
87 Context_handle beam_start_context_;
89 // We act as if beam were created, and start a grouping anyway.
90 Beaming_pattern *grouping_;
93 Beaming_pattern *finished_grouping_;
95 Beaming_options beaming_options_;
96 Beaming_options finished_beaming_options_;
98 void check_bar_property ();
102 Auto_beam_engraver::derived_mark () const
104 scm_gc_mark (beam_settings_);
108 Auto_beam_engraver::check_bar_property ()
110 /* Duplicated from process_music (), since
111 Repeat_acknowledge_engraver::process_music () may also set whichBar. */
113 Moment now = now_mom ();
114 if (scm_is_string (get_property ("whichBar"))
115 && beam_start_moment_ < now)
117 consider_end (measure_position (context ()), shortest_mom_);
123 Auto_beam_engraver::process_music ()
125 Moment now = now_mom ();
127 don't beam over skips
131 if (extend_mom_ < now)
135 if (scm_is_string (get_property ("whichBar")))
137 consider_end (measure_position (context ()), shortest_mom_);
150 Auto_beam_engraver::Auto_beam_engraver ()
153 process_acknowledged_count_ = 0;
155 shortest_mom_ = Moment (Rational (1, 4));
157 finished_grouping_ = 0;
159 beam_settings_ = SCM_EOL;
162 IMPLEMENT_TRANSLATOR_LISTENER (Auto_beam_engraver, beam_forbid);
164 Auto_beam_engraver::listen_beam_forbid (Stream_event *ev)
166 ASSIGN_EVENT_ONCE (forbid_, ev);
170 Auto_beam_engraver::test_moment (Direction dir, Moment test_mom, Moment dur)
172 return scm_call_4 (get_property ("autoBeamCheck"),
173 context ()->self_scm (),
175 test_mom.smobbed_copy (),
181 Auto_beam_engraver::consider_begin (Moment test_mom, Moment dur)
183 bool on = to_boolean (get_property ("autoBeaming"));
187 bool b = test_moment (START, test_mom, dur);
194 Auto_beam_engraver::consider_end (Moment test_mom, Moment dur)
198 /* Allow already started autobeam to end:
199 don't check for autoBeaming */
200 bool b = test_moment (STOP, test_mom, dur);
207 Auto_beam_engraver::create_beam ()
209 if (to_boolean (get_property ("skipTypesetting")))
212 for (vsize i = 0; i < stems_->size (); i++)
213 if (Stem::get_beam ((*stems_)[i]))
217 Can't use make_spanner () because we have to use
220 Spanner *beam = new Spanner (beam_settings_);
222 for (vsize i = 0; i < stems_->size (); i++)
223 Beam::add_stem (beam, (*stems_)[i]);
225 Grob_info i = make_grob_info (beam, (*stems_)[0]->self_scm ());
226 i.rerouting_daddy_context_ = beam_start_context_.get_context ();
233 Auto_beam_engraver::begin_beam ()
235 if (stems_ || grouping_)
237 programming_error ("already have autobeam");
241 stems_ = new vector<Item *>;
242 grouping_ = new Beaming_pattern ();
243 beaming_options_.from_context (context ());
244 beam_settings_ = updated_grob_properties (context (), ly_symbol2scm ("Beam"));
246 beam_start_context_.set_context (context ()->get_parent_context ());
247 beam_start_moment_ = now_mom ();
249 = robust_scm2moment (get_property ("measurePosition"), Moment (0));
253 Auto_beam_engraver::junk_beam ()
262 beam_settings_ = SCM_EOL;
264 shortest_mom_ = Moment (Rational (1, 4));
268 Auto_beam_engraver::end_beam ()
270 if (stems_->size () < 2)
274 finished_beam_ = create_beam ();
278 Grob_info i = make_grob_info (finished_beam_, SCM_EOL);
279 i.rerouting_daddy_context_ = beam_start_context_.get_context ();
281 announce_end_grob (i);
282 finished_grouping_ = grouping_;
283 finished_beaming_options_ = beaming_options_;
288 beam_settings_ = SCM_EOL;
291 beam_start_context_.set_context (NULL);
292 shortest_mom_ = Moment (Rational (1, 4));
296 Auto_beam_engraver::typeset_beam ()
300 if (!finished_beam_->get_bound (RIGHT))
301 finished_beam_->set_bound (RIGHT, finished_beam_->get_bound (LEFT));
303 finished_grouping_->beamify (finished_beaming_options_);
304 Beam::set_beaming (finished_beam_, finished_grouping_);
307 delete finished_grouping_;
308 finished_grouping_ = 0;
313 Auto_beam_engraver::stop_translation_timestep ()
316 process_acknowledged_count_ = 0;
321 Auto_beam_engraver::finalize ()
323 /* finished beams may be typeset */
325 /* but unfinished may need another announce/acknowledge pass */
331 Auto_beam_engraver::acknowledge_beam (Grob_info /* info */)
333 check_bar_property ();
339 Auto_beam_engraver::acknowledge_bar_line (Grob_info /* info */)
341 check_bar_property ();
347 Auto_beam_engraver::acknowledge_breathing_sign (Grob_info /* info */)
349 check_bar_property ();
355 Auto_beam_engraver::acknowledge_rest (Grob_info /* info */)
357 check_bar_property ();
363 Auto_beam_engraver::acknowledge_stem (Grob_info info)
365 check_bar_property ();
366 Item *stem = dynamic_cast<Item *> (info.grob ());
367 Stream_event *ev = info.ultimate_event_cause ();
368 if (!ev->in_event_class ("rhythmic-event"))
370 programming_error ("stem must have rhythmic structure");
375 Don't (start) auto-beam over empty stems; skips or rests
377 if (!Stem::head_count (stem))
384 if (Stem::get_beam (stem))
391 int durlog = unsmob_duration (ev->get_property ("duration"))->duration_log ();
403 Moment now = now_mom ();
404 if (bool (beam_start_location_.grace_part_) != bool (now.grace_part_))
407 Duration *stem_duration = unsmob_duration (ev->get_property ("duration"));
408 Moment dur = stem_duration->get_length ();
410 //Moment dur = unsmob_duration (ev->get_property ("duration"))->get_length ();
411 Moment measure_now = measure_position (context ());
412 bool recheck_needed = false;
414 if (dur < shortest_mom_)
416 /* new shortest moment, so store it and set recheck_needed */
418 recheck_needed = true;
421 /* end should be based on shortest_mom_, begin should be
422 based on current duration */
423 consider_end (measure_now, shortest_mom_);
424 consider_begin (measure_now, dur);
429 grouping_->add_stem (now - beam_start_moment_ + beam_start_location_,
431 Stem::is_invisible (stem),
432 stem_duration->factor (),
433 (stem->get_property ("tuplet-start") == SCM_BOOL_T));
434 stems_->push_back (stem);
436 extend_mom_ = max (extend_mom_, now) + get_event_length (ev, now);
442 Auto_beam_engraver::recheck_beam ()
445 Recheck the beam after the shortest duration has changed
446 If shorter duration has created a new break, typeset the
447 first part of the beam and reset the current beam to just
448 the last part of the beam
450 Beaming_pattern *new_grouping_ = 0;
451 vector<Item *> *new_stems_ = 0;
452 Moment temporary_shortest_mom;
453 SCM temporary_beam_settings;
457 for (vsize i = 0; i < stems_->size () - 1;)
459 found_end = test_moment (STOP,
460 grouping_->end_moment (i),
467 Save the current beam settings and shortest_mom_
468 Necessary because end_beam destroys them
470 temporary_shortest_mom = shortest_mom_;
471 temporary_beam_settings = beam_settings_;
473 /* Eliminate (and save) the items no longer part of the first beam */
475 new_grouping_ = grouping_->split_pattern (i);
476 new_stems_ = remove_end_stems (i);
481 /* now recreate the unbeamed data structures */
483 grouping_ = new_grouping_;
484 shortest_mom_ = temporary_shortest_mom;
485 beam_settings_ = temporary_beam_settings;
495 Remove all stems with an index greater than split_index
496 from stems_, and return a vector containing all of the
500 Auto_beam_engraver::remove_end_stems (vsize split_index)
502 vector <Item *> *removed_stems = 0;
503 removed_stems = new vector <Item *>;
505 for (vsize j = split_index + 1; j < stems_->size (); j++)
506 removed_stems->push_back ((*stems_).at (j));
507 for (vsize j = split_index + 1; j < stems_->size ();)
509 return removed_stems;
513 Auto_beam_engraver::process_acknowledged ()
515 Moment now = now_mom ();
516 if (extend_mom_ > now)
519 if (!process_acknowledged_count_)
521 Moment measure_now = measure_position (context ());
522 consider_end (measure_now, shortest_mom_);
524 else if (process_acknowledged_count_ > 1)
528 if ((extend_mom_ < now)
529 || ((extend_mom_ == now) && (last_add_mom_ != now)))
531 else if (!stems_->size ())
536 process_acknowledged_count_++;
539 ADD_ACKNOWLEDGER (Auto_beam_engraver, stem);
540 ADD_ACKNOWLEDGER (Auto_beam_engraver, bar_line);
541 ADD_ACKNOWLEDGER (Auto_beam_engraver, beam);
542 ADD_ACKNOWLEDGER (Auto_beam_engraver, breathing_sign);
543 ADD_ACKNOWLEDGER (Auto_beam_engraver, rest);
544 ADD_TRANSLATOR (Auto_beam_engraver,
546 "Generate beams based on measure characteristics and observed"
547 " Stems. Uses @code{baseMoment}, @code{beatStructure},"
548 " @code{beamExceptions}, @code{measureLength}, and"
549 " @code{measurePosition} to decide when to start and stop a"
550 " beam. Overriding beaming is done through"
551 " @ref{Stem_engraver} properties @code{stemLeftBeamCount} and"
552 " @code{stemRightBeamCount}.",