]> git.donarmstrong.com Git - lilypond.git/blob - lily/grid-line-span-engraver.cc
Issue 3933: Use \tempo in Real music example
[lilypond.git] / lily / grid-line-span-engraver.cc
1 /*
2   This file is part of LilyPond, the GNU music typesetter.
3
4   Copyright (C) 2005--2014 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                );