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 }
  24
  25 void
  26 Stem_engraver::do_creation_processing ()
  27 {
  28   Scalar prop = get_property ("abbrev", 0);
  29   if (prop.isnum_b ())
  30     {
  31       default_abbrev_i_  = prop;
  32     }
  33 }
  34
  35 void
  36 Stem_engraver::acknowledge_element(Score_element_info i)
  37 {
  38   if (dynamic_cast<Rhythmic_head *> (i.elem_l_))
  39     {
  40       Rhythmic_head *h  = dynamic_cast<Rhythmic_head *> (i.elem_l_);
  41       if (!stem_p_)
  42         {
  43           Rhythmic_req * r = dynamic_cast <Rhythmic_req *> (i.req_l_);
  44           stem_p_ = new Stem;
  45           int durlog_i = r->duration_.durlog_i_;
  46           stem_p_->flag_i_ = durlog_i;
  47
  48
  49           if (abbrev_req_l_)
  50             {
  51               /*
  52                 suggests typing of:
  53                    c8:16 c: c: c:
  54                 hmm, which isn't so bad?
  55               */
  56               int t = abbrev_req_l_->type_i_;
  57               if (!t)
  58                 t = default_abbrev_i_;
  59               else
  60                 default_abbrev_i_ = t;
  61
  62               if (t)
  63                 {
  64                   abbrev_p_ = new Abbreviation;
  65                   announce_element (Score_element_info (abbrev_p_, abbrev_req_l_));
  66                   abbrev_p_->abbrev_flags_i_ =intlog2 (t) - (durlog_i>? 2);
  67                 }
  68             }
  69
  70           // must give the request, to preserve the rhythmic info.
  71           announce_element (Score_element_info (stem_p_, r));
  72         }
  73       stem_p_->add_head (h);
  74     }
  75 }
  76
  77 void
  78 Stem_engraver::do_pre_move_processing()
  79 {
  80   if (abbrev_p_)
  81     {
  82       abbrev_p_->set_stem (stem_p_);
  83       typeset_element (abbrev_p_);
  84       abbrev_p_ = 0;
  85     }
  86
  87   if (stem_p_)
  88     {
  89       Scalar prop = get_property ("ydirection", 0);
  90       Direction 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       Translator const *which;
  98       prop = get_property ("stemLeftBeamCount", &which);
  99       if (prop.isnum_b ())
 100         {
 101           stem_p_->beams_i_drul_[LEFT] = prop;
 102           ((Translator*)which)->set_property ("stemLeftBeamCount", "");
 103         }
 104       prop = get_property ("stemRightBeamCount", &which);
 105       if (prop.isnum_b ())
 106         {
 107           stem_p_->beams_i_drul_[RIGHT] = prop;
 108           ((Translator*)which)->set_property ("stemRightBeamCount", "");
 109         }
 110
 111
 112       typeset_element(stem_p_);
 113       stem_p_ = 0;
 114     }
 115   abbrev_req_l_ = 0;
 116 }
 117
 118 bool
 119 Stem_engraver::do_try_music (Music* r)
 120 {
 121   if (Abbreviation_req* a = dynamic_cast <Abbreviation_req *> (r))
 122     {
 123       abbrev_req_l_ = a;
 124       return true;
 125     }
 126   return false;
 127 }
 128
 129
 130 ADD_THIS_TRANSLATOR(Stem_engraver);