lily/grid-line-span-engraver.cc

   1 /*
   2   This file is part of LilyPond, the GNU music typesetter.
   3
   4   Copyright (C) 2005--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 "item.hh"
  22 #include "grid-line-interface.hh"
  23
  24 class Grid_line_span_engraver : public Engraver
  25 {
  26   Item *spanline_;
  27   vector<Item*> lines_;
  28
  29 public:
  30   TRANSLATOR_DECLARATIONS (Grid_line_span_engraver);
  31 protected:
  32   DECLARE_ACKNOWLEDGER (grid_point);
  33   void stop_translation_timestep ();
  34 };
  35
  36 Grid_line_span_engraver::Grid_line_span_engraver ()
  37 {
  38   spanline_ = 0;
  39 }
  40
  41 void
  42 Grid_line_span_engraver::acknowledge_grid_point (Grob_info i)
  43 {
  44   int depth = i.origin_contexts (this).size ();
  45   if (depth)
  46     {
  47       Item *it = dynamic_cast<Item *> (i.grob ());
  48       lines_.push_back (it);
  49
  50       if (lines_.size () >= 2 && !spanline_)
  51         {
  52           spanline_ = make_item ("GridLine", SCM_EOL);
  53           spanline_->set_parent (lines_[0], X_AXIS);
  54         }
  55     }
  56 }
  57
  58 void
  59 Grid_line_span_engraver::stop_translation_timestep ()
  60 {
  61   if (spanline_)
  62     {
  63       for (vsize i = 0; i < lines_.size (); i++)
  64         Grid_line_interface::add_grid_point (spanline_, lines_[i]);
  65
  66       spanline_ = 0;
  67     }
  68   lines_.resize (0);
  69 }
  70
  71 #include "translator.icc"
  72 ADD_ACKNOWLEDGER (Grid_line_span_engraver, grid_point);
  73 ADD_TRANSLATOR (Grid_line_span_engraver,
  74                 /* doc */
  75                 "This engraver makes cross-staff lines: It catches all normal"
  76                 " lines and draws a single span line across them.",
  77
  78                 /* create */
  79                 "GridLine ",
  80
  81                 /* read */
  82                 "",
  83
  84                 /* write */
  85                 ""
  86                 );