lily/stem-grav.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@stack.nl>
   7 */
   8
   9 #include "stem-grav.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_elem_info i)
  38 {
  39   if (i.elem_l_->is_type_b (Rhythmic_head::static_name()))
  40     {
  41       Rhythmic_head *h  = (Rhythmic_head*) i.elem_l_->item();
  42       if (!stem_p_)
  43         {
  44           Rhythmic_req * r = i.req_l_->musical()->rhythmic();
  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               int t = abbrev_req_l_->type_i_;
  53               if (!t)
  54                 t = default_abbrev_i_;
  55               else
  56                 default_abbrev_i_ = t;
  57
  58               abbrev_p_ = new Abbreviation;
  59               announce_element (Score_elem_info (abbrev_p_, abbrev_req_l_));
  60               abbrev_p_->abbrev_flags_i_ =intlog2 (t) - (durlog_i>? 2);
  61             }
  62           announce_element (Score_elem_info (stem_p_, r));
  63         }
  64       stem_p_->add (h);
  65     }
  66 }
  67
  68 void
  69 Stem_engraver::do_pre_move_processing()
  70 {
  71   if (abbrev_p_)
  72     {
  73       abbrev_p_->set_stem (stem_p_);
  74       typeset_element (abbrev_p_);
  75       abbrev_p_ = 0;
  76     }
  77   if (stem_p_)
  78     {
  79       Scalar prop = get_property ("ydirection");
  80       dir_ = prop.isnum_b () ? (Direction)int(prop) : CENTER;
  81       if (dir_)
  82         {
  83           stem_p_->dir_ = dir_;
  84           stem_p_->dir_forced_b_ = true;
  85         }
  86
  87       typeset_element(stem_p_);
  88       stem_p_ = 0;
  89     }
  90   abbrev_req_l_ = 0;
  91 }
  92
  93 bool
  94 Stem_engraver::do_try_request (Request* r)
  95 {
  96   Musical_req* mus_l = r->musical ();
  97   if (!mus_l)
  98     return false;
  99
 100   Abbreviation_req* a = mus_l->abbrev ();
 101   if (!a)
 102     return false;
 103
 104   abbrev_req_l_ = a;
 105
 106   return true;
 107 }
 108
 109 IMPLEMENT_IS_TYPE_B1(Stem_engraver, Engraver);
 110 ADD_THIS_TRANSLATOR(Stem_engraver);