lily/rest-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 <set>
  21
  22 #include "duration.hh"
  23 #include "engraver.hh"
  24 #include "international.hh"
  25 #include "item.hh"
  26 #include "moment.hh"
  27 #include "note-column.hh"
  28 #include "paper-column.hh"
  29 #include "rest.hh"
  30 #include "rest-collision.hh"
  31 #include "rhythmic-head.hh"
  32 #include "stream-event.hh"
  33 #include "warn.hh"
  34
  35 class Rest_collision_engraver : public Engraver
  36 {
  37 protected:
  38   Grob *rest_collision_;
  39
  40   void process_acknowledged ();
  41   void stop_translation_timestep ();
  42 public:
  43   TRANSLATOR_DECLARATIONS (Rest_collision_engraver);
  44 };
  45
  46 Rest_collision_engraver::Rest_collision_engraver ()
  47 {
  48   rest_collision_ = 0;
  49 }
  50
  51 void
  52 Rest_collision_engraver::process_acknowledged ()
  53 {
  54   vsize rest_count = 0;
  55   set<Grob*> columns;
  56   Moment now = now_mom ();
  57
  58   for (SCM s = get_property ("busyGrobs"); scm_is_pair (s); s = scm_cdr (s))
  59     {
  60       Grob *g = unsmob_grob (scm_cdar (s));
  61       Moment *m = unsmob_moment (scm_caar (s));
  62       if (!g || !m)
  63         continue;
  64
  65       if (Rhythmic_head::has_interface (g) && (*m) > now)
  66         {
  67           Grob *column = g->get_parent (X_AXIS);
  68           if (!column)
  69             {
  70               g->warning (_ ("rhythmic head is not part of a rhythmic column"));
  71               continue;
  72             }
  73
  74           // Only include rests that start now. Include notes that started any time.
  75           Paper_column *paper_column = dynamic_cast<Item*> (column)->get_column ();
  76           if (!Rest::has_interface (g) || !paper_column || Paper_column::when_mom (paper_column) == now)
  77             {
  78               columns.insert (column);
  79               rest_count += Note_column::has_rests (column);
  80             }
  81         }
  82     }
  83
  84   if (!rest_collision_ && rest_count && columns.size () > 1)
  85     {
  86       rest_collision_ = make_item ("RestCollision", SCM_EOL);
  87       for (set<Grob*>::iterator i = columns.begin (); i != columns.end (); ++i)
  88         Rest_collision::add_column (rest_collision_, *i);
  89     }
  90 }
  91
  92 void
  93 Rest_collision_engraver::stop_translation_timestep ()
  94 {
  95   rest_collision_ = 0;
  96 }
  97
  98 #include "translator.icc"
  99
 100 ADD_TRANSLATOR (Rest_collision_engraver,
 101                 /* doc */
 102                 "Handle collisions of rests.",
 103
 104                 /* create */
 105                 "RestCollision ",
 106
 107                 /* read */
 108                 "busyGrobs ",
 109
 110                 /* write */
 111                 ""
 112                 );