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   SCM prop = get_property ("abbrev", 0);
  32   if (gh_number_p(prop))
  33     {
  34       default_abbrev_i_  = gh_scm2int (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       if (h->stem_l_)
  44         return;
  45
  46       Rhythmic_req * r = dynamic_cast <Rhythmic_req *> (i.req_l_);
  47       int duration_log = r->duration_.durlog_i_;
  48       if (!stem_p_)
  49         {
  50           stem_p_ = new Stem;
  51           stem_p_->flag_i_ = duration_log;
  52
  53           if (abbrev_req_l_)
  54             {
  55               /*
  56                 suggests typing of:
  57                 c8:16 c: c: c:
  58                 hmm, which isn't so bad?
  59               */
  60               int t = abbrev_req_l_->type_i_;
  61               if (!t)
  62                 t = default_abbrev_i_;
  63               else
  64                 default_abbrev_i_ = t;
  65
  66               if (t)
  67                 {
  68                   abbrev_p_ = new Stem_tremolo;
  69                   announce_element (Score_element_info (abbrev_p_, abbrev_req_l_));
  70                   abbrev_p_->abbrev_flags_i_ =intlog2 (t) - (duration_log>? 2);
  71                 }
  72             }
  73
  74           // must give the request, to preserve the rhythmic info.
  75           announce_element (Score_element_info (stem_p_, r));
  76         }
  77
  78       if (stem_p_->flag_i_ != duration_log)
  79         {
  80           r->warning (_f ("Adding note head to incompatible stem (type = %d)", 1 <<  stem_p_->flag_i_));
  81         }
  82
  83       stem_p_->add_head (h);
  84     }
  85 }
  86
  87 void
  88 Stem_engraver::do_pre_move_processing()
  89 {
  90   if (abbrev_p_)
  91     {
  92       abbrev_p_->set_stem (stem_p_);
  93       typeset_element (abbrev_p_);
  94       abbrev_p_ = 0;
  95     }
  96
  97   if (stem_p_)
  98     {
  99       SCM prop = get_property ("verticalDirection", 0);
 100       if (gh_number_p(prop))
 101         {
 102           stem_p_->set_direction (to_dir (prop));
 103           stem_p_->set_elt_property ("dir-forced", SCM_BOOL_T);
 104         }
 105
 106       Translator_group* which;
 107       prop = get_property ("stemLeftBeamCount", &which);
 108       if (gh_number_p(prop))
 109         {
 110           stem_p_->beams_i_drul_[LEFT] = gh_scm2int (prop);
 111           ((Translator_group*)which)->set_property ("stemLeftBeamCount", SCM_UNDEFINED);
 112         }
 113       prop = get_property ("stemRightBeamCount", &which);
 114       if (gh_number_p(prop))
 115         {
 116           stem_p_->beams_i_drul_[RIGHT] = gh_scm2int (prop);
 117           ((Translator_group*)which)->set_property ("stemRightBeamCount", SCM_UNDEFINED);
 118         }
 119       typeset_element(stem_p_);
 120       stem_p_ = 0;
 121     }
 122   abbrev_req_l_ = 0;
 123 }
 124
 125 bool
 126 Stem_engraver::do_try_music (Music* r)
 127 {
 128   if (Tremolo_req* a = dynamic_cast <Tremolo_req *> (r))
 129     {
 130       abbrev_req_l_ = a;
 131       return true;
 132     }
 133   return false;
 134 }
 135
 136
 137 ADD_THIS_TRANSLATOR(Stem_engraver);
 138