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 "staff-symbol-referencer.hh"
  10 #include "stem-engraver.hh"
  11 #include "note-head.hh"
  12 #include "stem.hh"
  13 #include "musical-request.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           Staff_symbol_referencer_interface st(stem_p_);
  52           st.set_interface ();
  53
  54           stem_p_->set_elt_property ("duration-log", gh_int2scm (duration_log));
  55
  56           if (abbrev_req_l_)
  57             {
  58               /*
  59                 suggests typing of:
  60                 c8:16 c: c: c:
  61                 hmm, which isn't so bad?
  62               */
  63               int t = abbrev_req_l_->type_i_;
  64               if (!t)
  65                 t = default_abbrev_i_;
  66               else
  67                 default_abbrev_i_ = t;
  68
  69               if (t)
  70                 {
  71                   abbrev_p_ = new Stem_tremolo;
  72                   announce_element (Score_element_info (abbrev_p_, abbrev_req_l_));
  73                   abbrev_p_->set_elt_property ("tremolo-flags", gh_int2scm (intlog2 (t) - (duration_log>? 2)));
  74                 }
  75             }
  76
  77           // must give the request, to preserve the rhythmic info.
  78           announce_element (Score_element_info (stem_p_, r));
  79         }
  80
  81       if (stem_p_->flag_i () != duration_log)
  82         {
  83           r->warning (_f ("Adding note head to incompatible stem (type = %d)", 1 <<  stem_p_->flag_i ()));
  84         }
  85
  86       stem_p_->add_head (h);
  87     }
  88 }
  89
  90 void
  91 Stem_engraver::do_pre_move_processing()
  92 {
  93   if (abbrev_p_)
  94     {
  95       abbrev_p_->set_stem (stem_p_);
  96       typeset_element (abbrev_p_);
  97       abbrev_p_ = 0;
  98     }
  99
 100   if (stem_p_)
 101     {
 102       Translator_group* which;
 103       SCM prop = get_property ("stemLeftBeamCount", &which);
 104       if (gh_number_p(prop))
 105         {
 106           stem_p_->set_beaming (gh_scm2int (prop),LEFT);
 107           ((Translator_group*)which)->set_property ("stemLeftBeamCount", SCM_UNDEFINED);
 108         }
 109       prop = get_property ("stemRightBeamCount", &which);
 110       if (gh_number_p(prop))
 111         {
 112           stem_p_->set_beaming (gh_scm2int (prop), RIGHT);
 113           ((Translator_group*)which)->set_property ("stemRightBeamCount", SCM_UNDEFINED);
 114         }
 115
 116       // UGH. Should mark non-forced instead.
 117       SCM dir = stem_p_->get_elt_property ("direction");
 118       if (gh_number_p (dir) && to_dir(dir))
 119         {
 120           stem_p_->set_elt_property ("dir-forced", SCM_BOOL_T);
 121         }
 122
 123
 124       typeset_element(stem_p_);
 125       stem_p_ = 0;
 126     }
 127   abbrev_req_l_ = 0;
 128 }
 129
 130 bool
 131 Stem_engraver::do_try_music (Music* r)
 132 {
 133   if (Tremolo_req* a = dynamic_cast <Tremolo_req *> (r))
 134     {
 135       abbrev_req_l_ = a;
 136       return true;
 137     }
 138   return false;
 139 }
 140
 141
 142 ADD_THIS_TRANSLATOR(Stem_engraver);
 143