lily/abbreviation-beam-engraver.cc

   1 /*
   2   abbreviation-beam-engraver.cc -- implement Abbreviation_beam_engraver
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 1997 Han-Wen Nienhuys <hanwen@stack.nl>
   7            Jan Nieuwenhuizen <jan@digicash.com>
   8 */
   9
  10 #include "duration-convert.hh"
  11 #include "time-description.hh"
  12 #include "abbreviation-beam-engraver.hh"
  13 #include "stem.hh"
  14 #include "abbreviation-beam.hh"
  15 #include "musical-request.hh"
  16 #include "misc.hh"
  17
  18 IMPLEMENT_IS_TYPE_B1(Abbreviation_beam_engraver, Engraver);
  19 ADD_THIS_TRANSLATOR(Abbreviation_beam_engraver);
  20
  21 Abbreviation_beam_engraver::Abbreviation_beam_engraver ()
  22 {
  23   span_reqs_drul_[LEFT] = span_reqs_drul_[RIGHT] = 0;
  24   abeam_p_ = 0;
  25 }
  26
  27 bool
  28 Abbreviation_beam_engraver::do_try_request (Request*r)
  29 {
  30   Musical_req* mus_l = r->musical ();
  31   if (!mus_l)
  32     return false;
  33
  34   Abbreviation_beam_req * b = mus_l->abbrev_beam ();
  35
  36   if (!b)
  37     return false;
  38
  39   if (bool (abeam_p_) == bool (b->spantype == Span_req::START))
  40     return false;
  41
  42   Direction d = (!abeam_p_) ? LEFT : RIGHT;
  43   if (span_reqs_drul_[d] && !span_reqs_drul_[d]->equal_b (mus_l))
  44     return false;
  45
  46   span_reqs_drul_[d] = b;
  47   return true;
  48 }
  49
  50 void
  51 Abbreviation_beam_engraver::do_process_requests ()
  52 {
  53   if (!abeam_p_ && span_reqs_drul_[LEFT]) {
  54     abeam_p_ = new Abbreviation_beam;
  55     announce_element (Score_elem_info (abeam_p_, span_reqs_drul_[LEFT]));
  56   }
  57 }
  58
  59 void
  60 Abbreviation_beam_engraver::do_pre_move_processing ()
  61 {
  62   if (abeam_p_ && span_reqs_drul_[RIGHT]) {
  63     typeset_element (abeam_p_);
  64     abeam_p_ = 0;
  65
  66     span_reqs_drul_[RIGHT] =
  67       span_reqs_drul_[LEFT] = 0;
  68   }
  69 }
  70
  71 void
  72 Abbreviation_beam_engraver::do_removal_processing ()
  73 {
  74   if (abeam_p_)
  75     {
  76       span_reqs_drul_[LEFT]->warning (_("unterminated beam"));
  77       typeset_element (abeam_p_);
  78       abeam_p_ = 0;
  79     }
  80 }
  81
  82 void
  83 Abbreviation_beam_engraver::acknowledge_element (Score_elem_info i)
  84 {
  85   if (!abeam_p_ || !i.elem_l_->is_type_b (Stem::static_name ()))
  86     return;
  87
  88   Stem* s = (Stem*)i.elem_l_->item ();
  89
  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_;
  94   else
  95     s->beams_right_i_ = s->flag_i_;
  96
  97   if (s->type_i () != 1) // no abbrev gaps on half note
  98     s->beam_gap_i_ = s->flag_i_ - ((s->type_i () >? 2) - 2);
  99
 100   abeam_p_->add (s);
 101 }