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 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
  16 Stem_engraver::Stem_engraver()
  17 {
  18   abbrev_req_l_ = 0;
  19   stem_p_ = 0;
  20   default_abbrev_i_ = 16;
  21   dir_ = CENTER;
  22 }
  23
  24 void
  25 Stem_engraver::do_creation_processing ()
  26 {
  27   Scalar prop = get_property ("abbrev");
  28   if (prop.isnum_b ())
  29     {
  30       default_abbrev_i_  = prop;
  31     }
  32 }
  33
  34 void
  35 Stem_engraver::acknowledge_element(Score_elem_info i)
  36 {
  37   if (i.elem_l_->is_type_b (Rhythmic_head::static_name()))
  38     {
  39       Rhythmic_head *h  = (Rhythmic_head*) i.elem_l_->item();
  40       if (!stem_p_)
  41         {
  42           Rhythmic_req * r = i.req_l_->musical()->rhythmic();
  43           stem_p_ = new Stem;
  44           int durlog_i = r->duration_.durlog_i_;
  45           stem_p_->flag_i_ = durlog_i;
  46
  47
  48           if (abbrev_req_l_)
  49             {
  50               int t = abbrev_req_l_->type_i_;
  51               if (!t)
  52                 t = default_abbrev_i_;
  53               else
  54                 default_abbrev_i_ = t;
  55               stem_p_->abbrev_flag_i_ =intlog2 (t) - (durlog_i>? 2);
  56             }
  57           announce_element (Score_elem_info (stem_p_, r));
  58         }
  59       stem_p_->add (h);
  60     }
  61 }
  62
  63 void
  64 Stem_engraver::do_pre_move_processing()
  65 {
  66   if (stem_p_)
  67     {
  68       Scalar prop = get_property ("ydirection");
  69       dir_ = prop.isnum_b () ? int(prop) : CENTER;
  70       if (dir_)
  71         stem_p_->dir_ = dir_;
  72
  73       typeset_element(stem_p_);
  74       stem_p_ = 0;
  75     }
  76   abbrev_req_l_ = 0;
  77 }
  78
  79 bool
  80 Stem_engraver::do_try_request (Request* r)
  81 {
  82   Musical_req* mus_l = r->musical ();
  83   if (!mus_l)
  84     return false;
  85
  86   Abbreviation_req* a = mus_l->abbrev ();
  87   if (!a)
  88     return false;
  89
  90   abbrev_req_l_ = a;
  91
  92   return true;
  93 }
  94
  95 IMPLEMENT_IS_TYPE_B1(Stem_engraver, Engraver);
  96 ADD_THIS_TRANSLATOR(Stem_engraver);