2 beam-engraver.cc -- implement Beam_engraver
4 source file of the GNU LilyPond music typesetter
6 (c) 1998--2000 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
24 Drul_array<Span_req*> reqs_drul_;
26 Link_array<Stem> stems_;
29 Spanner *finished_beam_p_;
31 Span_req * prev_start_req_;
33 Beaming_info_list * beam_info_p_;
34 Beaming_info_list * finished_beam_info_p_;
36 /// location within measure where beam started.
37 Moment beam_start_location_;
39 /// moment (global time) where beam started.
40 Moment beam_start_mom_;
43 void set_melisma (bool);
45 virtual void stop_translation_timestep ();
46 virtual void start_translation_timestep ();
47 virtual void do_removal_processing ();
48 virtual void create_grobs ();
49 virtual void acknowledge_grob (Grob_info);
50 virtual bool try_music (Music*);
51 void deprecated_process_music ();
54 VIRTUAL_COPY_CONS (Translator);
58 Beam_engraver::Beam_engraver ()
62 finished_beam_info_p_=0;
64 reqs_drul_[LEFT] = reqs_drul_[RIGHT] =0;
69 Beam_engraver::try_music (Music *m)
71 if (Span_req * c = dynamic_cast<Span_req*>(m))
73 if (scm_equal_p (c->get_mus_property ("span-type"),
74 ly_str02scm ("abort")) == SCM_BOOL_T)
76 reqs_drul_[START] = 0;
82 else if (scm_equal_p (c->get_mus_property ("span-type"),
83 ly_str02scm ("beam")) == SCM_BOOL_T)
86 Direction d =c->get_span_dir ();
88 if (d == STOP && !beam_p_)
90 m->origin ()->warning (_ ("can't find start of beam"));
96 SCM m = get_property ("automaticMelismata");
97 SCM b = get_property("noAutoBeaming");
98 if (to_boolean (m) && to_boolean(b))
112 Beam_engraver::set_melisma (bool m)
114 daddy_trans_l_->set_property ("beamMelismaBusy", m ? SCM_BOOL_T :SCM_BOOL_F);
119 Beam_engraver::deprecated_process_music ()
121 if (reqs_drul_[STOP])
124 reqs_drul_[STOP]->origin ()->warning (_("can't find start of beam"));
126 finished_beam_p_ = beam_p_;
127 finished_beam_info_p_ = beam_info_p_;
134 if (beam_p_ && !to_boolean (get_property ("weAreGraceContext")))
136 Score_engraver * e = 0;
137 Translator * t = daddy_grav_l ();
138 for (; !e && t; t = t->daddy_trans_l_)
140 e = dynamic_cast<Score_engraver*> (t);
144 programming_error ("No score engraver!");
149 if (reqs_drul_[START])
153 reqs_drul_[START]->origin ()->warning (_ ("already have a beam"));
157 prev_start_req_ = reqs_drul_[START];
158 beam_p_ = new Spanner (get_property ("Beam"));
159 Beam::set_interface (beam_p_);
161 SCM smp = get_property ("measurePosition");
162 Moment mp = (unsmob_moment (smp)) ? *unsmob_moment (smp) : Moment (0);
164 beam_start_location_ = mp;
165 beam_start_mom_ = now_mom();
166 beam_info_p_ = new Beaming_info_list;
169 /* urg, must copy to Auto_beam_engraver too */
171 announce_grob (beam_p_, reqs_drul_[START]);
173 reqs_drul_[STOP] = 0;
174 reqs_drul_[START] = 0;
178 Beam_engraver::typeset_beam ()
180 if (finished_beam_p_)
182 finished_beam_info_p_->beamify ();
184 Beam::set_beaming (finished_beam_p_, finished_beam_info_p_);
185 typeset_grob (finished_beam_p_);
186 delete finished_beam_info_p_;
187 finished_beam_info_p_ =0;
188 finished_beam_p_ = 0;
190 reqs_drul_[STOP] = 0;
195 Beam_engraver::start_translation_timestep ()
197 reqs_drul_ [START] =0;
199 SCM m = get_property ("automaticMelismata");
200 SCM b = get_property("noAutoBeaming");
201 if (to_boolean (m) && to_boolean(b)) {
208 Beam_engraver::stop_translation_timestep ()
214 Beam_engraver::do_removal_processing ()
219 prev_start_req_->origin ()->warning (_ ("unterminated beam"));
221 finished_beam_p_ = beam_p_;
222 finished_beam_info_p_ = beam_info_p_;
232 Beam_engraver::create_grobs ()
234 deprecated_process_music ();
239 Beam_engraver::acknowledge_grob (Grob_info info)
243 if (Rest::has_interface (info.elem_l_))
245 info.elem_l_->add_offset_callback (Beam::rest_collision_callback_proc, Y_AXIS);
247 else if (Stem::has_interface (info.elem_l_))
249 Item *stem_l = dynamic_cast<Item*> (info.elem_l_);
250 if (Stem::beam_l (stem_l))
253 bool stem_grace = stem_l->get_grob_property ("grace") == SCM_BOOL_T;
255 SCM wg =get_property ("weAreGraceContext");
256 bool wgb= to_boolean (wg);
258 if (wgb!= stem_grace)
261 Rhythmic_req *rhythmic_req = dynamic_cast <Rhythmic_req *> (info.req_l_);
264 String s = _ ("stem must have Rhythmic structure");
266 info.req_l_->origin ()->warning (s);
273 int durlog = unsmob_duration (rhythmic_req->get_mus_property ("duration"))-> duration_log ();
276 rhythmic_req->origin ()->warning (_ ("stem doesn't fit in beam"));
277 prev_start_req_->origin ()->warning (_ ("beam was started here"));
281 [r4 c8] can just as well be modern notation.
285 stem_l->set_grob_property ("duration-log",
286 gh_int2scm (durlog));
287 Moment stem_location = now_mom () - beam_start_mom_ + beam_start_location_;
288 beam_info_p_->add_stem (stem_location,
290 Beam::add_stem (beam_p_, stem_l);
297 ADD_THIS_TRANSLATOR(Beam_engraver);