2 beam-engraver.cc -- implement Beam_engraver
4 source file of the GNU LilyPond music typesetter
6 (c) 1998--2001 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 finalize ();
48 virtual void acknowledge_grob (Grob_info);
49 virtual bool try_music (Music*);
50 virtual void 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 ();
90 SCM m = get_property ("automaticMelismata");
91 SCM b = get_property ("noAutoBeaming");
92 if (to_boolean (m) && to_boolean (b))
106 Beam_engraver::set_melisma (bool m)
108 daddy_trans_l_->set_property ("beamMelismaBusy", m ? SCM_BOOL_T :SCM_BOOL_F);
112 Beam_engraver::process_music ()
114 if (reqs_drul_[STOP])
117 reqs_drul_[STOP]->origin ()->warning (_ ("can't find start of beam"));
119 finished_beam_p_ = beam_p_;
120 finished_beam_info_p_ = beam_info_p_;
127 if (beam_p_ && !to_boolean (get_property ("weAreGraceContext")))
129 Score_engraver * e = 0;
130 Translator * t = daddy_grav_l ();
131 for (; !e && t; t = t->daddy_trans_l_)
133 e = dynamic_cast<Score_engraver*> (t);
137 programming_error ("No score engraver!");
142 if (reqs_drul_[START])
146 reqs_drul_[START]->origin ()->warning (_ ("already have a beam"));
150 prev_start_req_ = reqs_drul_[START];
151 beam_p_ = new Spanner (get_property ("Beam"));
152 SCM smp = get_property ("measurePosition");
153 Moment mp = (unsmob_moment (smp)) ? *unsmob_moment (smp) : Moment (0);
155 beam_start_location_ = mp;
156 beam_start_mom_ = now_mom ();
157 beam_info_p_ = new Beaming_info_list;
160 /* urg, must copy to Auto_beam_engraver too */
162 announce_grob (beam_p_, reqs_drul_[START]);
167 Beam_engraver::typeset_beam ()
169 if (finished_beam_p_)
171 finished_beam_info_p_->beamify ();
173 Beam::set_beaming (finished_beam_p_, finished_beam_info_p_);
174 typeset_grob (finished_beam_p_);
175 delete finished_beam_info_p_;
176 finished_beam_info_p_ =0;
177 finished_beam_p_ = 0;
182 Beam_engraver::start_translation_timestep ()
184 reqs_drul_ [START] =0;
185 reqs_drul_ [STOP] =0;
188 SCM m = get_property ("automaticMelismata");
189 SCM b = get_property ("noAutoBeaming");
190 if (to_boolean (m) && to_boolean (b)) {
197 Beam_engraver::stop_translation_timestep ()
203 Beam_engraver::finalize ()
208 prev_start_req_->origin ()->warning (_ ("unterminated beam"));
211 we don't typeset it, (we used to, but it was commented
212 out. Reason unknown) */
219 Beam_engraver::acknowledge_grob (Grob_info info)
223 if (Rest::has_interface (info.elem_l_))
225 info.elem_l_->add_offset_callback (Beam::rest_collision_callback_proc, Y_AXIS);
227 else if (Stem::has_interface (info.elem_l_))
229 Item *stem_l = dynamic_cast<Item*> (info.elem_l_);
230 if (Stem::beam_l (stem_l))
233 bool stem_grace = stem_l->get_grob_property ("grace") == SCM_BOOL_T;
235 SCM wg =get_property ("weAreGraceContext");
236 bool wgb= to_boolean (wg);
238 if (wgb!= stem_grace)
241 Rhythmic_req *rhythmic_req = dynamic_cast <Rhythmic_req *> (info.req_l_);
244 String s = _ ("stem must have Rhythmic structure");
246 info.req_l_->origin ()->warning (s);
253 int durlog = unsmob_duration (rhythmic_req->get_mus_property ("duration"))-> duration_log ();
256 rhythmic_req->origin ()->warning (_ ("stem doesn't fit in beam"));
257 prev_start_req_->origin ()->warning (_ ("beam was started here"));
261 [r4 c8] can just as well be modern notation.
265 stem_l->set_grob_property ("duration-log",
266 gh_int2scm (durlog));
267 Moment stem_location = now_mom () - beam_start_mom_ + beam_start_location_;
268 beam_info_p_->add_stem (stem_location,
270 Beam::add_stem (beam_p_, stem_l);
277 ADD_THIS_TRANSLATOR (Beam_engraver);