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 Spanner *finished_beam_p_;
28 Span_req * prev_start_req_;
30 Beaming_info_list * beam_info_p_;
31 Beaming_info_list * finished_beam_info_p_;
33 /// location within measure where beam started.
34 Moment beam_start_location_;
36 /// moment (global time) where beam started.
37 Moment beam_start_mom_;
40 void set_melisma (bool);
42 virtual void do_pre_move_processing ();
43 virtual void do_post_move_processing ();
44 virtual void do_removal_processing ();
45 virtual void process_acknowledged ();
46 virtual void acknowledge_element (Score_element_info);
47 virtual bool do_try_music (Music*);
48 void deprecated_process_music ();
51 VIRTUAL_COPY_CONS (Translator);
55 Beam_engraver::Beam_engraver ()
59 finished_beam_info_p_=0;
61 reqs_drul_[LEFT] = reqs_drul_[RIGHT] =0;
66 Beam_engraver::do_try_music (Music *m)
68 if (Span_req * c = dynamic_cast<Span_req*>(m))
70 if (scm_equal_p (c->get_mus_property ("span-type"),
71 ly_str02scm ("abort")) == SCM_BOOL_T)
73 reqs_drul_[START] = 0;
79 else if (scm_equal_p (c->get_mus_property ("span-type"),
80 ly_str02scm ("beam")) == SCM_BOOL_T)
83 Direction d =c->get_span_dir ();
85 if (d == STOP && !beam_p_)
87 m->origin ()->warning (_ ("can't find start of beam"));
93 SCM m = get_property ("automaticMelismata");
94 SCM b = get_property("noAutoBeaming");
95 if (to_boolean (m) && to_boolean(b))
109 Beam_engraver::set_melisma (bool m)
111 daddy_trans_l_->set_property ("beamMelismaBusy", m ? SCM_BOOL_T :SCM_BOOL_F);
116 Beam_engraver::deprecated_process_music ()
118 if (reqs_drul_[STOP])
121 reqs_drul_[STOP]->origin ()->warning (_("can't find start of beam"));
123 finished_beam_p_ = beam_p_;
124 finished_beam_info_p_ = beam_info_p_;
131 if (beam_p_ && !to_boolean (get_property ("weAreGraceContext")))
133 Score_engraver * e = 0;
134 Translator * t = daddy_grav_l ();
135 for (; !e && t; t = t->daddy_trans_l_)
137 e = dynamic_cast<Score_engraver*> (t);
141 programming_error ("No score engraver!");
146 if (reqs_drul_[START])
150 reqs_drul_[START]->origin ()->warning (_ ("already have a beam"));
154 prev_start_req_ = reqs_drul_[START];
155 beam_p_ = new Spanner (get_property ("Beam"));
156 Beam::set_interface (beam_p_);
158 SCM smp = get_property ("measurePosition");
159 Moment mp = (unsmob_moment (smp)) ? *unsmob_moment (smp) : Moment (0);
161 beam_start_location_ = mp;
162 beam_start_mom_ = now_mom();
163 beam_info_p_ = new Beaming_info_list;
166 /* urg, must copy to Auto_beam_engraver too */
168 announce_element (beam_p_, reqs_drul_[START]);
170 reqs_drul_[STOP] = 0;
171 reqs_drul_[START] = 0;
175 Beam_engraver::typeset_beam ()
177 if (finished_beam_p_)
179 finished_beam_info_p_->beamify ();
181 Beam::set_beaming (finished_beam_p_, finished_beam_info_p_);
182 typeset_element (finished_beam_p_);
183 delete finished_beam_info_p_;
184 finished_beam_info_p_ =0;
185 finished_beam_p_ = 0;
187 reqs_drul_[STOP] = 0;
192 Beam_engraver::do_post_move_processing ()
194 reqs_drul_ [START] =0;
196 SCM m = get_property ("automaticMelismata");
197 SCM b = get_property("noAutoBeaming");
198 if (to_boolean (m) && to_boolean(b)) {
205 Beam_engraver::do_pre_move_processing ()
211 Beam_engraver::do_removal_processing ()
216 prev_start_req_->origin ()->warning (_ ("unterminated beam"));
218 finished_beam_p_ = beam_p_;
219 finished_beam_info_p_ = beam_info_p_;
229 Beam_engraver::process_acknowledged ()
231 deprecated_process_music ();
236 Beam_engraver::acknowledge_element (Score_element_info info)
240 if (Rest::has_interface (info.elem_l_))
242 info.elem_l_->add_offset_callback (Beam::rest_collision_callback_proc, Y_AXIS);
244 else if (Stem::has_interface (info.elem_l_))
246 Item *stem_l = dynamic_cast<Item*> (info.elem_l_);
247 if (Stem::beam_l (stem_l))
250 bool stem_grace = stem_l->get_elt_property ("grace") == SCM_BOOL_T;
252 SCM wg =get_property ("weAreGraceContext");
253 bool wgb= to_boolean (wg);
255 if (wgb!= stem_grace)
258 Rhythmic_req *rhythmic_req = dynamic_cast <Rhythmic_req *> (info.req_l_);
261 String s = _ ("stem must have Rhythmic structure");
263 info.req_l_->origin ()->warning (s);
270 int durlog = unsmob_duration (rhythmic_req->get_mus_property ("duration"))-> duration_log ();
273 rhythmic_req->origin ()->warning (_ ("stem doesn't fit in beam"));
274 prev_start_req_->origin ()->warning (_ ("beam was started here"));
278 [r4 c8] can just as well be modern notation.
282 stem_l->set_elt_property ("duration-log",
283 gh_int2scm (durlog));
284 Moment stem_location = now_mom () - beam_start_mom_ + beam_start_location_;
285 beam_info_p_->add_stem (stem_location,
287 Beam::add_stem (beam_p_, stem_l);
294 ADD_THIS_TRANSLATOR(Beam_engraver);