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--2009 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 #include "item.hh"
  14
  15 class Collision_engraver : public Engraver
  16 {
  17   Item *col_;
  18   vector<Grob*> note_columns_;
  19
  20 protected:
  21   DECLARE_ACKNOWLEDGER (note_column);
  22   void process_acknowledged ();
  23   void stop_translation_timestep ();
  24 public:
  25   TRANSLATOR_DECLARATIONS (Collision_engraver);
  26 };
  27
  28 void
  29 Collision_engraver::process_acknowledged ()
  30 {
  31   if (col_ || note_columns_.size () < 2)
  32     return;
  33   if (!col_)
  34     col_ = make_item ("NoteCollision", SCM_EOL);
  35
  36   for (vsize i = 0; i < note_columns_.size (); i++)
  37     Note_collision_interface::add_column (col_, note_columns_[i]);
  38 }
  39
  40 void
  41 Collision_engraver::acknowledge_note_column (Grob_info i)
  42 {
  43   if (Note_column::has_interface (i.grob ()))
  44     {
  45       /*should check Y axis? */
  46       if (Note_column::has_rests (i.grob ()) || i.grob ()->get_parent (X_AXIS))
  47         return;
  48
  49       if (to_boolean (i.grob ()->get_property ("ignore-collision")))
  50         return;
  51
  52       note_columns_.push_back (i.grob ());
  53     }
  54 }
  55
  56 void
  57 Collision_engraver::stop_translation_timestep ()
  58 {
  59   col_ = 0;
  60   note_columns_.clear ();
  61 }
  62
  63 Collision_engraver::Collision_engraver ()
  64 {
  65   col_ = 0;
  66 }
  67
  68 #include "translator.icc"
  69
  70 ADD_ACKNOWLEDGER (Collision_engraver, note_column);
  71
  72 ADD_TRANSLATOR (Collision_engraver,
  73                 /* doc */
  74                 "Collect @code{NoteColumns}, and as soon as there are two or"
  75                 " more, put them in a @code{NoteCollision} object.",
  76
  77                 /* create */
  78                 "NoteCollision ",
  79
  80                 /* read */
  81                 "",
  82
  83                 /* write */
  84                 ""
  85                 );