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 "stem-tremolo.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   rhythmic_req_l_ =0;
  26 }
  27
  28 void
  29 Stem_engraver::do_creation_processing ()
  30 {
  31   Scalar prop = get_property ("abbrev", 0);
  32   if (prop.isnum_b ())
  33     {
  34       default_abbrev_i_  = prop;
  35     }
  36 }
  37
  38 void
  39 Stem_engraver::acknowledge_element(Score_element_info i)
  40 {
  41   if (Rhythmic_head * h = dynamic_cast<Rhythmic_head *> (i.elem_l_))
  42     {
  43       Rhythmic_req * r = dynamic_cast <Rhythmic_req *> (i.req_l_);
  44       int duration_log = r->duration_.durlog_i_;
  45       if (!stem_p_)
  46         {
  47           stem_p_ = new Stem;
  48           stem_p_->flag_i_ = duration_log;
  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 Stem_tremolo;
  66                   announce_element (Score_element_info (abbrev_p_, abbrev_req_l_));
  67                   abbrev_p_->abbrev_flags_i_ =intlog2 (t) - (duration_log>? 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
  75       if (stem_p_->flag_i_ != duration_log)
  76         {
  77           r->warning (_f("Adding note head to incompatible stem (type = %d)", 1 <<  stem_p_->flag_i_));
  78         }
  79
  80       stem_p_->add_head (h);
  81     }
  82 }
  83
  84 void
  85 Stem_engraver::do_pre_move_processing()
  86 {
  87   if (abbrev_p_)
  88     {
  89       abbrev_p_->set_stem (stem_p_);
  90       typeset_element (abbrev_p_);
  91       abbrev_p_ = 0;
  92     }
  93
  94   if (stem_p_)
  95     {
  96       Scalar prop = get_property ("verticalDirection", 0);
  97       Direction dir = prop.isnum_b () ? (Direction)int(prop) : CENTER;
  98       if (dir)
  99         {
 100           stem_p_->dir_ = dir;
 101           stem_p_->set_elt_property (dir_forced_scm_sym, SCM_BOOL_T);
 102         }
 103
 104       Translator_group const *which;
 105       prop = get_property ("stemLeftBeamCount", &which);
 106       if (prop.isnum_b ())
 107         {
 108           stem_p_->beams_i_drul_[LEFT] = prop;
 109           ((Translator_group*)which)->set_property ("stemLeftBeamCount", "");
 110         }
 111       prop = get_property ("stemRightBeamCount", &which);
 112       if (prop.isnum_b ())
 113         {
 114           stem_p_->beams_i_drul_[RIGHT] = prop;
 115           ((Translator_group*)which)->set_property ("stemRightBeamCount", "");
 116         }
 117
 118       typeset_element(stem_p_);
 119       stem_p_ = 0;
 120     }
 121   abbrev_req_l_ = 0;
 122 }
 123
 124 bool
 125 Stem_engraver::do_try_music (Music* r)
 126 {
 127   if (Tremolo_req* a = dynamic_cast <Tremolo_req *> (r))
 128     {
 129       abbrev_req_l_ = a;
 130       return true;
 131     }
 132   return false;
 133 }
 134
 135
 136 ADD_THIS_TRANSLATOR(Stem_engraver);