lily/stem-engraver.cc

   1 /*
   2   stem-grav.cc -- implement Stem_engraver
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c)  1997--1998 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   7 */
   8
   9 #include "stem-engraver.hh"
  10 #include "note-head.hh"
  11 #include "stem.hh"
  12 #include "musical-request.hh"
  13 #include "duration-convert.hh"
  14 #include "misc.hh"
  15 #include "abbrev.hh"
  16
  17 Stem_engraver::Stem_engraver()
  18 {
  19   abbrev_req_l_ = 0;
  20   stem_p_ = 0;
  21   abbrev_p_ = 0;
  22   default_abbrev_i_ = 16;
  23   dir_ = CENTER;
  24 }
  25
  26 void
  27 Stem_engraver::do_creation_processing ()
  28 {
  29   Scalar prop = get_property ("abbrev");
  30   if (prop.isnum_b ())
  31     {
  32       default_abbrev_i_  = prop;
  33     }
  34 }
  35
  36 void
  37 Stem_engraver::acknowledge_element(Score_element_info i)
  38 {
  39   if (dynamic_cast<Rhythmic_head *> (i.elem_l_))
  40     {
  41       Rhythmic_head *h  = dynamic_cast<Rhythmic_head *> (i.elem_l_);
  42       if (!stem_p_)
  43         {
  44           Rhythmic_req * r = dynamic_cast <Rhythmic_req *> (i.req_l_);
  45           stem_p_ = new Stem;
  46           int durlog_i = r->duration_.durlog_i_;
  47           stem_p_->flag_i_ = durlog_i;
  48
  49
  50           if (abbrev_req_l_)
  51             {
  52               /*
  53                 suggests typing of:
  54                    c8:16 c: c: c:
  55                 hmm, which isn't so bad?
  56               */
  57               int t = abbrev_req_l_->type_i_;
  58               if (!t)
  59                 t = default_abbrev_i_;
  60               else
  61                 default_abbrev_i_ = t;
  62
  63               if (t)
  64                 {
  65                   abbrev_p_ = new Abbreviation;
  66                   announce_element (Score_element_info (abbrev_p_, abbrev_req_l_));
  67                   abbrev_p_->abbrev_flags_i_ =intlog2 (t) - (durlog_i>? 2);
  68                 }
  69             }
  70
  71           // must give the request, to preserve the rhythmic info.
  72           announce_element (Score_element_info (stem_p_, r));
  73         }
  74       stem_p_->add_head (h);
  75     }
  76 }
  77
  78 void
  79 Stem_engraver::do_pre_move_processing()
  80 {
  81   if (abbrev_p_)
  82     {
  83       abbrev_p_->set_stem (stem_p_);
  84       typeset_element (abbrev_p_);
  85       abbrev_p_ = 0;
  86     }
  87   if (stem_p_)
  88     {
  89       Scalar prop = get_property ("ydirection");
  90       dir_ = prop.isnum_b () ? (Direction)int(prop) : CENTER;
  91       if (dir_)
  92         {
  93           stem_p_->dir_ = dir_;
  94           stem_p_->dir_forced_b_ = true;
  95         }
  96
  97       typeset_element(stem_p_);
  98       stem_p_ = 0;
  99     }
 100   abbrev_req_l_ = 0;
 101 }
 102
 103 bool
 104 Stem_engraver::do_try_request (Request* r)
 105 {
 106   Musical_req* mus_l = dynamic_cast <Musical_req *> (r);
 107   if (!mus_l)
 108     return false;
 109
 110   Abbreviation_req* a = dynamic_cast <Abbreviation_req *> (mus_l);
 111   if (!a)
 112     return false;
 113
 114   abbrev_req_l_ = a;
 115
 116   return true;
 117 }
 118
 119 IMPLEMENT_IS_TYPE_B1(Stem_engraver, Engraver);
 120 ADD_THIS_TRANSLATOR(Stem_engraver);