2 beam-engraver.cc -- implement Beam_engraver
4 source file of the GNU LilyPond music typesetter
6 (c) 1998--2002 Han-Wen Nienhuys <hanwen@cs.uu.nl>
9 #include "engraver-group-engraver.hh"
10 #include "engraver.hh"
11 #include "musical-request.hh"
16 #include "score-engraver.hh"
18 #include "drul-array.hh"
22 class Beam_engraver : public Engraver
25 Drul_array<Span_req*> reqs_drul_;
27 Spanner *finished_beam_;
29 Span_req * prev_start_req_;
31 Beaming_info_list * beam_info_;
32 Beaming_info_list * finished_beam_info_;
34 /// location within measure where beam started.
35 Moment beam_start_location_;
37 /// moment (global time) where beam started.
38 Moment beam_start_mom_;
40 bool subdivide_beams_;
44 void set_melisma (bool);
46 Moment last_stem_added_at_;
50 virtual void stop_translation_timestep ();
51 virtual void start_translation_timestep ();
52 virtual void finalize ();
54 virtual void acknowledge_grob (Grob_info);
55 virtual bool try_music (Music*);
56 virtual void process_music ();
58 virtual bool valid_start_moment();
59 virtual bool valid_end_moment ();
62 TRANSLATOR_DECLARATIONS( Beam_engraver );
67 Hmm. this isn't necessary, since grace beams and normal beams are
71 Beam_engraver::valid_start_moment()
73 Moment n = now_mom ();
75 return n.grace_part_ == Rational (0);
79 Beam_engraver::valid_end_moment()
81 return last_stem_added_at_.grace_part_ == Rational(0);
85 Beam_engraver::Beam_engraver ()
89 finished_beam_info_=0;
91 reqs_drul_[LEFT] = reqs_drul_[RIGHT] =0;
97 Beam_engraver::try_music (Music *m)
99 if (Span_req * c = dynamic_cast<Span_req*> (m))
101 if (scm_equal_p (c->get_mus_property ("span-type"),
102 ly_str02scm ("abort")) == SCM_BOOL_T)
104 reqs_drul_[START] = 0;
105 reqs_drul_[STOP] = 0;
110 else if (scm_equal_p (c->get_mus_property ("span-type"),
111 ly_str02scm ("beam")) == SCM_BOOL_T)
113 Direction d =c->get_span_dir ();
116 if (d == STOP && !valid_end_moment())
119 if (d == START && !valid_start_moment ())
124 SCM m = get_property ("automaticMelismata");
125 SCM b = get_property ("autoBeaming");
126 if (to_boolean (m) && !to_boolean (b))
140 Beam_engraver::set_melisma (bool m)
142 daddy_trans_->set_property ("beamMelismaBusy", m ? SCM_BOOL_T :SCM_BOOL_F);
146 Beam_engraver::process_music ()
148 if (reqs_drul_[STOP])
151 finished_beam_ = beam_;
152 finished_beam_info_ = beam_info_;
161 top_engraver ()->forbid_breaks ();
163 if (reqs_drul_[START])
167 reqs_drul_[START]->origin ()->warning (_ ("already have a beam"));
171 prev_start_req_ = reqs_drul_[START];
172 beam_ = new Spanner (get_property ("Beam"));
173 SCM smp = get_property ("measurePosition");
174 Moment mp = (unsmob_moment (smp)) ? *unsmob_moment (smp) : Moment (0);
176 beam_start_location_ = mp;
177 beam_start_mom_ = now_mom ();
179 beam_info_ = new Beaming_info_list;
181 /* urg, must copy to Auto_beam_engraver too */
183 announce_grob(beam_, reqs_drul_[START]->self_scm());
190 Beam_engraver::typeset_beam ()
194 finished_beam_info_->beamify(beat_length_, subdivide_beams_);
195 Beam::set_beaming (finished_beam_, finished_beam_info_);
196 typeset_grob (finished_beam_);
197 delete finished_beam_info_;
198 finished_beam_info_ =0;
204 Beam_engraver::start_translation_timestep ()
206 reqs_drul_ [START] =0;
207 reqs_drul_[STOP] = 0;
211 SCM m = get_property ("automaticMelismata");
212 SCM b = get_property ("autoBeaming");
213 if (to_boolean (m) && !to_boolean (b))
217 subdivide_beams_ = to_boolean(get_property("subdivideBeams"));
218 beat_length_ = *unsmob_moment (get_property ("beatLength"));
223 Beam_engraver::stop_translation_timestep ()
229 Beam_engraver::finalize ()
234 prev_start_req_->origin ()->warning (_ ("unterminated beam"));
237 we don't typeset it, (we used to, but it was commented
238 out. Reason unknown) */
245 Beam_engraver::acknowledge_grob (Grob_info info)
249 if (Rest::has_interface (info.grob_))
251 info.grob_->add_offset_callback (Beam::rest_collision_callback_proc, Y_AXIS);
253 else if (Stem::has_interface (info.grob_))
255 Moment now = now_mom();
257 if (!valid_start_moment ())
260 Item *stem = dynamic_cast<Item*> (info.grob_);
261 if (Stem::get_beam (stem))
264 Rhythmic_req *rhythmic_req = dynamic_cast <Rhythmic_req *> (info.music_cause ());
267 String s = _ ("stem must have Rhythmic structure");
268 if (info.music_cause ())
269 info.music_cause ()->origin ()->warning (s);
277 last_stem_added_at_ = now;
278 int durlog = unsmob_duration (rhythmic_req->get_mus_property ("duration"))-> duration_log ();
281 rhythmic_req->origin ()->warning (_ ("stem doesn't fit in beam"));
282 prev_start_req_->origin ()->warning (_ ("beam was started here"));
286 [r4 c8] can just as well be modern notation.
290 stem->set_grob_property ("duration-log",
291 gh_int2scm (durlog));
292 Moment stem_location = now - beam_start_mom_ + beam_start_location_;
293 beam_info_->add_stem (stem_location,
295 Beam::add_stem (beam_, stem);
304 ENTER_DESCRIPTION(Beam_engraver,
305 /* descr */ "Handles Beam_requests by engraving Beams. If omitted, then notes will be
306 printed with flags instead of beams.",
308 /* acks */ "stem-interface rest-interface",
309 /* reads */ "beamMelismaBusy beatLength subdivideBeams",
313 class Grace_beam_engraver : public Beam_engraver
316 TRANSLATOR_DECLARATIONS(Grace_beam_engraver);
319 virtual bool valid_start_moment();
320 virtual bool valid_end_moment ();
323 Grace_beam_engraver::Grace_beam_engraver()
328 Grace_beam_engraver::valid_start_moment()
330 Moment n = now_mom ();
332 return n.grace_part_ != Rational (0);
337 Grace_beam_engraver::valid_end_moment ()
339 return beam_ && last_stem_added_at_.grace_part_ != Rational(0);
344 ENTER_DESCRIPTION(Grace_beam_engraver,
345 /* descr */ "Handles Beam_requests by engraving Beams. If omitted, then notes will
346 be printed with flags instead of beams. Only engraves beams when we
347 are at grace points in time.
350 /* acks */ "stem-interface rest-interface",
351 /* reads */ "beamMelismaBusy beatLength subdivideBeams",