lily/collision-engraver.cc

   1 /*
   2   collision-engraver.cc -- implement Collision_engraver
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 1997--2006 Han-Wen Nienhuys <hanwen@xs4all.nl>
   7 */
   8
   9 #include "engraver.hh"
  10 #include "note-column.hh"
  11 #include "note-collision.hh"
  12 #include "axis-group-interface.hh"
  13
  14 class Collision_engraver : public Engraver
  15 {
  16   Item *col_;
  17   vector<Grob*> note_columns_;
  18
  19 protected:
  20   DECLARE_ACKNOWLEDGER (note_column);
  21   void process_acknowledged ();
  22   void stop_translation_timestep ();
  23 public:
  24   TRANSLATOR_DECLARATIONS (Collision_engraver);
  25 };
  26
  27 void
  28 Collision_engraver::process_acknowledged ()
  29 {
  30   if (col_ || note_columns_.size () < 2)
  31     return;
  32   if (!col_)
  33     col_ = make_item ("NoteCollision", SCM_EOL);
  34
  35   for (vsize i = 0; i < note_columns_.size (); i++)
  36     Note_collision_interface::add_column (col_, note_columns_[i]);
  37 }
  38
  39 void
  40 Collision_engraver::acknowledge_note_column (Grob_info i)
  41 {
  42   if (Note_column::has_interface (i.grob ()))
  43     {
  44       /*should check Y axis? */
  45       if (Note_column::has_rests (i.grob ()) || i.grob ()->get_parent (X_AXIS))
  46         return;
  47
  48       note_columns_.push_back (i.grob ());
  49     }
  50 }
  51
  52 void
  53 Collision_engraver::stop_translation_timestep ()
  54 {
  55   col_ = 0;
  56   note_columns_.clear ();
  57 }
  58
  59 Collision_engraver::Collision_engraver ()
  60 {
  61   col_ = 0;
  62 }
  63
  64 #include "translator.icc"
  65
  66 ADD_ACKNOWLEDGER (Collision_engraver, note_column);
  67
  68 ADD_TRANSLATOR (Collision_engraver,
  69                 /* doc */ "Collect NoteColumns, and as soon as there are two or more, put them in a NoteCollision object.",
  70                 /* create */ "NoteCollision",
  71                 /* accept */ "",
  72                 /* read */ "",
  73                 /* write */ "");