2 beam-engraver.cc -- implement Beam_engraver
4 source file of the GNU LilyPond music typesetter
6 (c) 1998--1999 Han-Wen Nienhuys <hanwen@cs.uu.nl>
9 #include "timing-engraver.hh"
10 #include "engraver-group-engraver.hh"
11 #include "beam-engraver.hh"
12 #include "musical-request.hh"
16 #include "timing-translator.hh"
18 #include "score-engraver.hh"
20 Beam_engraver::Beam_engraver ()
24 finished_beam_info_p_=0;
26 reqs_drul_[LEFT] = reqs_drul_[RIGHT] =0;
31 Beam_engraver::do_try_music (Music *m)
33 if (Span_req * c = dynamic_cast<Span_req*>(m))
35 if (c->span_type_str_ != "beam")
38 Direction d =c->span_dir_;
40 if (d == STOP && !beam_p_)
42 m->warning (_ ("no beam to end"));
53 Beam_engraver::do_process_requests ()
58 reqs_drul_[STOP]->warning (_("no beam to end"));
60 finished_beam_p_ = beam_p_;
61 finished_beam_info_p_ = beam_info_p_;
70 Score_engraver * e = 0;
71 Translator * t = daddy_grav_l ();
72 for (; !e && t; t = t->daddy_trans_l_)
74 e = dynamic_cast<Score_engraver*> (t);
78 programming_error ("No score engraver!");
83 if (reqs_drul_[START])
87 reqs_drul_[START]->warning (_ ("Already have a Beam"));
91 prev_start_req_ = reqs_drul_[START];
94 Translator * t = daddy_grav_l ()->get_simple_translator ("Timing_engraver");
95 Timing_engraver *timer = dynamic_cast<Timing_engraver*> (t);
96 beam_start_location_ = (t) ? timer->measure_position () : Moment (0);
97 beam_start_mom_ = now_mom();
98 beam_info_p_ = new Beaming_info_list;
101 /* urg, must copy to Auto_beam_engraver too */
103 announce_element (Score_element_info (beam_p_, reqs_drul_[START]));
108 Beam_engraver::typeset_beam ()
110 if (finished_beam_p_)
112 finished_beam_info_p_->beamify ();
114 finished_beam_p_->set_beaming (finished_beam_info_p_);
115 typeset_element (finished_beam_p_);
116 delete finished_beam_info_p_;
117 finished_beam_info_p_ =0;
118 finished_beam_p_ = 0;
120 reqs_drul_[STOP] = 0;
125 Beam_engraver::do_post_move_processing ()
127 reqs_drul_ [START] =0;
131 Beam_engraver::do_pre_move_processing ()
137 Beam_engraver::do_removal_processing ()
142 prev_start_req_->warning (_ ("unfinished beam"));
143 finished_beam_p_ = beam_p_;
144 finished_beam_info_p_ = beam_info_p_;
150 Beam_engraver::acknowledge_element (Score_element_info info)
154 Stem* stem_l = dynamic_cast<Stem *> (info.elem_l_);
155 if (!stem_l || stem_l->beam_l ())
159 bool stem_grace = stem_l->get_elt_property ("grace") == SCM_BOOL_T;
161 SCM wg =get_property ("weAreGraceContext",0);
162 bool wgb= gh_boolean_p (wg) && gh_scm2bool (wg);
164 if (wgb!= stem_grace)
167 Rhythmic_req *rhythmic_req = dynamic_cast <Rhythmic_req *> (info.req_l_);
170 String s = _ ("Stem must have Rhythmic structure");
172 info.req_l_->warning (s);
179 if (rhythmic_req->duration_.durlog_i_<= 2)
181 rhythmic_req->warning (_ ("Stem doesn't fit in beam"));
182 prev_start_req_->warning (_ ("Beam was started here"));
186 stem_l->flag_i_ = rhythmic_req->duration_.durlog_i_;
187 Moment stem_location = now_mom () - beam_start_mom_ + beam_start_location_;
188 beam_info_p_->add_stem (stem_location, rhythmic_req->duration_.durlog_i_ - 2);
189 beam_p_->add_stem (stem_l);
195 ADD_THIS_TRANSLATOR(Beam_engraver);