lily/tie-grav.cc

   1 /*
   2   tie-reg.cc -- implement Tie_engraver
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 1997 Han-Wen Nienhuys <hanwen@stack.nl>
   7 */
   8
   9 #include "tie-grav.hh"
  10 #include "tie.hh"
  11 #include "note-head.hh"
  12 #include "musical-request.hh"
  13 #include "music-list.hh"
  14
  15 Tie_engraver::Tie_engraver()
  16 {
  17   end_tie_p_ = 0;
  18   tie_p_ = 0;
  19   req_l_ =0;
  20   end_req_l_ =0;
  21   end_mom_ = -1;
  22   melodic_req_l_ = 0;
  23   end_melodic_req_l_ =0;
  24   dir_ = CENTER;
  25 }
  26
  27 void
  28 Tie_engraver::do_post_move_processing()
  29 {
  30   if (tie_p_ && now_moment () == end_mom_)
  31     {
  32       end_tie_p_ = tie_p_;
  33       end_req_l_ = req_l_;
  34       end_melodic_req_l_ = melodic_req_l_;
  35       tie_p_ =0;
  36       req_l_ =0;
  37       end_mom_ = -1;
  38     }
  39 }
  40
  41 bool
  42 Tie_engraver::acceptable_request_b (Request*r)
  43 {
  44   return r->musical() && r->musical ()->tie ();
  45 }
  46
  47 bool
  48 Tie_engraver::do_try_request (Request*r)
  49 {
  50   if (!acceptable_request_b (r))
  51     return false;
  52   if (req_l_)
  53     {
  54       return false;
  55     }
  56   req_l_ = r->musical()->tie ();
  57   end_mom_ = r->parent_music_l_->time_int().length ()
  58     + now_moment ();
  59   return true;
  60 }
  61
  62 void
  63 Tie_engraver::do_process_requests()
  64 {
  65   dir_ = (Direction) int (get_property ("ydirection"));
  66   if (req_l_ && ! tie_p_)
  67     {
  68       tie_p_ = new Tie;
  69     }
  70 }
  71
  72 void
  73 Tie_engraver::acknowledge_element (Score_elem_info i)
  74 {
  75   if (i.elem_l_->name() == Note_head::static_name ())
  76     {
  77       if (tie_p_)
  78         {
  79           tie_p_->set_head (LEFT, (Note_head*)i.elem_l_->item());
  80           melodic_req_l_ = i.req_l_->musical()->melodic ();
  81         }
  82
  83       if (end_tie_p_)
  84         {
  85           end_tie_p_->set_head (RIGHT, (Note_head*)i.elem_l_->item());
  86           if (!Melodic_req::compare (*end_melodic_req_l_, *melodic_req_l_))
  87             end_tie_p_->same_pitch_b_ = true;
  88           announce_element (Score_elem_info (end_tie_p_,end_req_l_));
  89         }
  90     }
  91 }
  92
  93 void
  94 Tie_engraver::do_pre_move_processing()
  95 {
  96   if (end_tie_p_)
  97     {
  98       if (dir_)
  99         end_tie_p_->dir_ =  dir_;
 100
 101       typeset_element (end_tie_p_);
 102       end_tie_p_ =0;
 103       end_req_l_ =0;
 104     }
 105 }
 106
 107 void
 108 Tie_engraver::do_removal_processing ()
 109 {
 110   do_pre_move_processing ();
 111   if (tie_p_)
 112     {
 113       req_l_->warning ("unended Tie");
 114       tie_p_->unlink ();
 115       delete tie_p_;
 116     }
 117 }
 118
 119
 120
 121 IMPLEMENT_IS_TYPE_B1(Tie_engraver,Engraver);
 122 ADD_THIS_TRANSLATOR(Tie_engraver);