2 abbreviation-beam-engraver.cc -- implement Abbreviation_beam_engraver
4 source file of the GNU LilyPond music typesetter
6 (c) 1997--1998 Han-Wen Nienhuys <hanwen@cs.uu.nl>
7 Jan Nieuwenhuizen <janneke@gnu.org>
10 #include "duration-convert.hh"
11 #include "time-description.hh"
12 #include "abbreviation-beam-engraver.hh"
14 #include "abbreviation-beam.hh"
15 #include "musical-request.hh"
18 IMPLEMENT_IS_TYPE_B1(Abbreviation_beam_engraver, Engraver);
19 ADD_THIS_TRANSLATOR(Abbreviation_beam_engraver);
21 Abbreviation_beam_engraver::Abbreviation_beam_engraver ()
23 span_reqs_drul_[LEFT] = span_reqs_drul_[RIGHT] = 0;
28 Abbreviation_beam_engraver::do_try_request (Request*r)
30 Musical_req* mus_l = dynamic_cast <Musical_req *> (r);
34 Abbreviation_beam_req * b = dynamic_cast <Abbreviation_beam_req *> (mus_l);
39 if (bool (abeam_p_) == bool (b->spantype == Span_req::START))
42 Direction d = (!abeam_p_) ? LEFT : RIGHT;
43 if (span_reqs_drul_[d] && !span_reqs_drul_[d]->equal_b (mus_l))
46 span_reqs_drul_[d] = b;
51 Abbreviation_beam_engraver::do_process_requests ()
53 if (!abeam_p_ && span_reqs_drul_[LEFT]) {
54 abeam_p_ = new Abbreviation_beam;
55 announce_element (Score_element_info (abeam_p_, span_reqs_drul_[LEFT]));
60 Abbreviation_beam_engraver::do_pre_move_processing ()
62 if (abeam_p_ && span_reqs_drul_[RIGHT]) {
63 typeset_element (abeam_p_);
66 span_reqs_drul_[RIGHT] =
67 span_reqs_drul_[LEFT] = 0;
72 Abbreviation_beam_engraver::do_removal_processing ()
76 span_reqs_drul_[LEFT]->warning (_("unterminated beam"));
77 typeset_element (abeam_p_);
83 Abbreviation_beam_engraver::acknowledge_element (Score_element_info i)
85 if (!abeam_p_ || !i.elem_l_->is_type_b (Stem::static_name ()))
88 Stem* s = (Stem*)dynamic_cast <Item *> (i.elem_l_);
90 int type_i = span_reqs_drul_[LEFT]->type_i_;
91 s->flag_i_ = intlog2 (type_i) - 2;
92 if (span_reqs_drul_[RIGHT])
93 s->beams_left_i_ = s->flag_i_;
95 s->beams_right_i_ = s->flag_i_;
97 abeam_p_->multiple_i_ = s->flag_i_;
98 if (s->type_i () != 1) // no abbrev gaps on half note
99 s->beam_gap_i_ = s->flag_i_ - ((s->type_i () >? 2) - 2);
101 abeam_p_->add_stem (s);