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"
20 class Beam_engraver : public Engraver
22 Drul_array<Span_req*> reqs_drul_;
24 Beam *finished_beam_p_;
26 Span_req * prev_start_req_;
28 Beaming_info_list * beam_info_p_;
29 Beaming_info_list * finished_beam_info_p_;
31 /// location within measure where beam started.
32 Moment beam_start_location_;
34 /// moment (global time) where beam started.
35 Moment beam_start_mom_;
39 virtual void do_pre_move_processing ();
40 virtual void do_post_move_processing ();
41 virtual void do_removal_processing ();
42 virtual void acknowledge_element (Score_element_info);
43 virtual bool do_try_music (Music*);
44 virtual void do_process_music ();
47 VIRTUAL_COPY_CONS (Translator);
51 Beam_engraver::Beam_engraver ()
55 finished_beam_info_p_=0;
57 reqs_drul_[LEFT] = reqs_drul_[RIGHT] =0;
62 Beam_engraver::do_try_music (Music *m)
64 if (Span_req * c = dynamic_cast<Span_req*>(m))
66 if (c->span_type_str_ != "beam")
69 Direction d =c->span_dir_;
71 if (d == STOP && !beam_p_)
73 m->warning (_ ("can't find start of beam"));
84 Beam_engraver::do_process_music ()
89 reqs_drul_[STOP]->warning (_("can't find start of beam"));
91 finished_beam_p_ = beam_p_;
92 finished_beam_info_p_ = beam_info_p_;
99 if (beam_p_ && !to_boolean (get_property ("weAreGraceContext")))
101 Score_engraver * e = 0;
102 Translator * t = daddy_grav_l ();
103 for (; !e && t; t = t->daddy_trans_l_)
105 e = dynamic_cast<Score_engraver*> (t);
109 programming_error ("No score engraver!");
114 if (reqs_drul_[START])
118 reqs_drul_[START]->warning (_ ("already have a beam"));
122 prev_start_req_ = reqs_drul_[START];
123 beam_p_ = new Beam (get_property ("basicBeamProperties"));
125 SCM smp = get_property ("measurePosition");
126 Moment mp = (unsmob_moment (smp)) ? *unsmob_moment (smp) : Moment (0);
128 beam_start_location_ = mp;
129 beam_start_mom_ = now_mom();
130 beam_info_p_ = new Beaming_info_list;
133 /* urg, must copy to Auto_beam_engraver too */
135 announce_element (Score_element_info (beam_p_, reqs_drul_[START]));
140 Beam_engraver::typeset_beam ()
142 if (finished_beam_p_)
144 finished_beam_info_p_->beamify ();
146 finished_beam_p_->set_beaming (finished_beam_info_p_);
147 typeset_element (finished_beam_p_);
148 delete finished_beam_info_p_;
149 finished_beam_info_p_ =0;
150 finished_beam_p_ = 0;
152 reqs_drul_[STOP] = 0;
157 Beam_engraver::do_post_move_processing ()
159 reqs_drul_ [START] =0;
163 Beam_engraver::do_pre_move_processing ()
169 Beam_engraver::do_removal_processing ()
174 prev_start_req_->warning (_ ("unterminated beam"));
175 finished_beam_p_ = beam_p_;
176 finished_beam_info_p_ = beam_info_p_;
182 Beam_engraver::acknowledge_element (Score_element_info info)
186 if (to_boolean (info.elem_l_->get_elt_property("rest-interface")))
188 info.elem_l_->add_offset_callback (Beam::rest_collision_callback, Y_AXIS);
190 else if (to_boolean (info.elem_l_->get_elt_property ("stem-interface")))
192 Stem *stem_l = dynamic_cast<Stem*> (info.elem_l_);
193 if (stem_l->beam_l ())
196 bool stem_grace = stem_l->get_elt_property ("grace") == SCM_BOOL_T;
198 SCM wg =get_property ("weAreGraceContext");
199 bool wgb= to_boolean (wg);
201 if (wgb!= stem_grace)
204 Rhythmic_req *rhythmic_req = dynamic_cast <Rhythmic_req *> (info.req_l_);
207 String s = _ ("stem must have Rhythmic structure");
209 info.req_l_->warning (s);
216 if (rhythmic_req->duration_.durlog_i_<= 2)
218 rhythmic_req->warning (_ ("stem doesn't fit in beam"));
219 prev_start_req_->warning (_ ("beam was started here"));
223 [r4 c8] can just as well be modern notation.
227 stem_l->set_elt_property ("duration-log",
228 gh_int2scm (rhythmic_req->duration_.durlog_i_));
229 Moment stem_location = now_mom () - beam_start_mom_ + beam_start_location_;
230 beam_info_p_->add_stem (stem_location,
231 (rhythmic_req->duration_.durlog_i_ - 2) >? 1);
232 beam_p_->add_stem (stem_l);
239 ADD_THIS_TRANSLATOR(Beam_engraver);