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