lily/collision-engraver.cc

   1 /*
   2   This file is part of LilyPond, the GNU music typesetter.
   3
   4   Copyright (C) 1997--2011 Han-Wen Nienhuys <hanwen@xs4all.nl>
   5
   6   LilyPond is free software: you can redistribute it and/or modify
   7   it under the terms of the GNU General Public License as published by
   8   the Free Software Foundation, either version 3 of the License, or
   9   (at your option) any later version.
  10
  11   LilyPond is distributed in the hope that it will be useful,
  12   but WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14   GNU General Public License for more details.
  15
  16   You should have received a copy of the GNU General Public License
  17   along with LilyPond.  If not, see <http://www.gnu.org/licenses/>.
  18 */
  19
  20 #include "engraver.hh"
  21 #include "note-column.hh"
  22 #include "note-collision.hh"
  23 #include "axis-group-interface.hh"
  24 #include "item.hh"
  25
  26 class Collision_engraver : public Engraver
  27 {
  28   Item *col_;
  29   vector<Grob*> note_columns_;
  30
  31 protected:
  32   DECLARE_ACKNOWLEDGER (note_column);
  33   void process_acknowledged ();
  34   void stop_translation_timestep ();
  35 public:
  36   TRANSLATOR_DECLARATIONS (Collision_engraver);
  37 };
  38
  39 void
  40 Collision_engraver::process_acknowledged ()
  41 {
  42   if (col_ || note_columns_.size () < 2)
  43     return;
  44   if (!col_)
  45     col_ = make_item ("NoteCollision", SCM_EOL);
  46
  47   for (vsize i = 0; i < note_columns_.size (); i++)
  48     Note_collision_interface::add_column (col_, note_columns_[i]);
  49 }
  50
  51 void
  52 Collision_engraver::acknowledge_note_column (Grob_info i)
  53 {
  54   if (Note_column::has_interface (i.grob ()))
  55     {
  56       /*should check Y axis? */
  57       if (Note_column::has_rests (i.grob ()) || i.grob ()->get_parent (X_AXIS))
  58         return;
  59
  60       if (to_boolean (i.grob ()->get_property ("ignore-collision")))
  61         return;
  62
  63       note_columns_.push_back (i.grob ());
  64     }
  65 }
  66
  67 void
  68 Collision_engraver::stop_translation_timestep ()
  69 {
  70   col_ = 0;
  71   note_columns_.clear ();
  72 }
  73
  74 Collision_engraver::Collision_engraver ()
  75 {
  76   col_ = 0;
  77 }
  78
  79 #include "translator.icc"
  80
  81 ADD_ACKNOWLEDGER (Collision_engraver, note_column);
  82
  83 ADD_TRANSLATOR (Collision_engraver,
  84                 /* doc */
  85                 "Collect @code{NoteColumns}, and as soon as there are two or"
  86                 " more, put them in a @code{NoteCollision} object.",
  87
  88                 /* create */
  89                 "NoteCollision ",
  90
  91                 /* read */
  92                 "",
  93
  94                 /* write */
  95                 ""
  96                 );