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 "duration-convert.hh"
  15 #include "misc.hh"
  16 #include "stem-tremolo.hh"
  17 #include "staff-info.hh"
  18 #include "translator-group.hh"
  19
  20 Stem_engraver::Stem_engraver()
  21 {
  22   abbrev_req_l_ = 0;
  23   stem_p_ = 0;
  24   abbrev_p_ = 0;
  25   default_abbrev_i_ = 16;
  26   rhythmic_req_l_ =0;
  27 }
  28
  29 void
  30 Stem_engraver::do_creation_processing ()
  31 {
  32   SCM prop = get_property ("abbrev", 0);
  33   if (gh_number_p(prop))
  34     {
  35       default_abbrev_i_  = gh_scm2int (prop);
  36     }
  37 }
  38
  39 void
  40 Stem_engraver::acknowledge_element(Score_element_info i)
  41 {
  42   if (Rhythmic_head * h = dynamic_cast<Rhythmic_head *> (i.elem_l_))
  43     {
  44       if (h->stem_l ())
  45         return;
  46
  47       Rhythmic_req * r = dynamic_cast <Rhythmic_req *> (i.req_l_);
  48       int duration_log = r->duration_.durlog_i_;
  49       if (!stem_p_)
  50         {
  51           stem_p_ = new Stem;
  52           Staff_symbol_referencer_interface st(stem_p_);
  53           st.set_interface ();
  54
  55           stem_p_->set_elt_property ("duration-log", gh_int2scm (duration_log));
  56
  57           if (abbrev_req_l_)
  58             {
  59               /*
  60                 suggests typing of:
  61                 c8:16 c: c: c:
  62                 hmm, which isn't so bad?
  63               */
  64               int t = abbrev_req_l_->type_i_;
  65               if (!t)
  66                 t = default_abbrev_i_;
  67               else
  68                 default_abbrev_i_ = t;
  69
  70               if (t)
  71                 {
  72                   abbrev_p_ = new Stem_tremolo;
  73                   announce_element (Score_element_info (abbrev_p_, abbrev_req_l_));
  74                   abbrev_p_->abbrev_flags_i_ =intlog2 (t) - (duration_log>? 2);
  75                 }
  76             }
  77
  78           // must give the request, to preserve the rhythmic info.
  79           announce_element (Score_element_info (stem_p_, r));
  80         }
  81
  82       if (stem_p_->flag_i () != duration_log)
  83         {
  84           r->warning (_f ("Adding note head to incompatible stem (type = %d)", 1 <<  stem_p_->flag_i ()));
  85         }
  86
  87       stem_p_->add_head (h);
  88     }
  89 }
  90
  91 void
  92 Stem_engraver::do_pre_move_processing()
  93 {
  94   if (abbrev_p_)
  95     {
  96       abbrev_p_->set_stem (stem_p_);
  97       typeset_element (abbrev_p_);
  98       abbrev_p_ = 0;
  99     }
 100
 101   if (stem_p_)
 102     {
 103       Translator_group* which;
 104       SCM prop = get_property ("stemLeftBeamCount", &which);
 105       if (gh_number_p(prop))
 106         {
 107           stem_p_->set_beaming (gh_scm2int (prop),LEFT);
 108           ((Translator_group*)which)->set_property ("stemLeftBeamCount", SCM_UNDEFINED);
 109         }
 110       prop = get_property ("stemRightBeamCount", &which);
 111       if (gh_number_p(prop))
 112         {
 113           stem_p_->set_beaming (gh_scm2int (prop), RIGHT);
 114           ((Translator_group*)which)->set_property ("stemRightBeamCount", SCM_UNDEFINED);
 115         }
 116
 117       // UGH. Should mark non-forced instead.
 118       SCM dir = stem_p_->get_elt_property ("direction");
 119       if (gh_number_p (dir) && to_dir(dir))
 120         {
 121           stem_p_->set_elt_property ("dir-forced", SCM_BOOL_T);
 122         }
 123
 124
 125       typeset_element(stem_p_);
 126       stem_p_ = 0;
 127     }
 128   abbrev_req_l_ = 0;
 129 }
 130
 131 bool
 132 Stem_engraver::do_try_music (Music* r)
 133 {
 134   if (Tremolo_req* a = dynamic_cast <Tremolo_req *> (r))
 135     {
 136       abbrev_req_l_ = a;
 137       return true;
 138     }
 139   return false;
 140 }
 141
 142
 143 ADD_THIS_TRANSLATOR(Stem_engraver);
 144