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--1999 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 #include "staff-info.hh"
  17 #include "translator-group.hh"
  18
  19 Stem_engraver::Stem_engraver()
  20 {
  21   abbrev_req_l_ = 0;
  22   stem_p_ = 0;
  23   abbrev_p_ = 0;
  24   default_abbrev_i_ = 16;
  25 }
  26
  27 void
  28 Stem_engraver::do_creation_processing ()
  29 {
  30   Scalar prop = get_property ("abbrev", 0);
  31   if (prop.isnum_b ())
  32     {
  33       default_abbrev_i_  = prop;
  34     }
  35 }
  36
  37 void
  38 Stem_engraver::acknowledge_element(Score_element_info i)
  39 {
  40   if (dynamic_cast<Rhythmic_head *> (i.elem_l_))
  41     {
  42       Rhythmic_head *h  = dynamic_cast<Rhythmic_head *> (i.elem_l_);
  43       if (!stem_p_)
  44         {
  45           Rhythmic_req * r = dynamic_cast <Rhythmic_req *> (i.req_l_);
  46           stem_p_ = new Stem;
  47           int durlog_i = r->duration_.durlog_i_;
  48           stem_p_->flag_i_ = durlog_i;
  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
  88   if (stem_p_)
  89     {
  90       Scalar prop = get_property ("ydirection", 0);
  91       Direction dir = prop.isnum_b () ? (Direction)int(prop) : CENTER;
  92       if (dir)
  93         {
  94           stem_p_->dir_ = dir;
  95           stem_p_->set_elt_property (dir_forced_scm_sym, SCM_BOOL_T);
  96         }
  97
  98       Translator_group const *which;
  99       prop = get_property ("stemLeftBeamCount", &which);
 100       if (prop.isnum_b ())
 101         {
 102           stem_p_->beams_i_drul_[LEFT] = prop;
 103           ((Translator_group*)which)->set_property ("stemLeftBeamCount", "");
 104         }
 105       prop = get_property ("stemRightBeamCount", &which);
 106       if (prop.isnum_b ())
 107         {
 108           stem_p_->beams_i_drul_[RIGHT] = prop;
 109           ((Translator_group*)which)->set_property ("stemRightBeamCount", "");
 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);