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       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       Scalar prop = get_property ("verticalDirection", 0);
 100       Direction dir = prop.isnum_b () ? (Direction)int(prop) : CENTER;
 101       if (dir)
 102         {
 103           stem_p_->dir_ = dir;
 104           stem_p_->set_elt_property (dir_forced_scm_sym, SCM_BOOL_T);
 105         }
 106
 107       Translator_group* which;
 108       prop = get_property ("stemLeftBeamCount", &which);
 109       if (prop.isnum_b ())
 110         {
 111           stem_p_->beams_i_drul_[LEFT] = prop;
 112           ((Translator_group*)which)->set_property ("stemLeftBeamCount", "");
 113         }
 114       prop = get_property ("stemRightBeamCount", &which);
 115       if (prop.isnum_b ())
 116         {
 117           stem_p_->beams_i_drul_[RIGHT] = prop;
 118           ((Translator_group*)which)->set_property ("stemRightBeamCount", "");
 119         }
 120
 121       prop = get_property ("stemLength", 0);
 122       if (prop.isnum_b ())
 123         {
 124           stem_p_->set_elt_property (length_scm_sym, gh_double2scm (prop.to_f ()));
 125         }
 126
 127       prop = get_property ("stemStyle", 0);
 128       if (prop.to_bool ())
 129         {
 130           stem_p_->set_elt_property (style_scm_sym, ly_ch_C_to_scm (prop.ch_C()));
 131         }
 132
 133       typeset_element(stem_p_);
 134       stem_p_ = 0;
 135     }
 136   abbrev_req_l_ = 0;
 137 }
 138
 139 bool
 140 Stem_engraver::do_try_music (Music* r)
 141 {
 142   if (Tremolo_req* a = dynamic_cast <Tremolo_req *> (r))
 143     {
 144       abbrev_req_l_ = a;
 145       return true;
 146     }
 147   return false;
 148 }
 149
 150
 151 ADD_THIS_TRANSLATOR(Stem_engraver);