lily/horizontal-bracket-engraver.cc

   1 /*
   2   horizontal-bracket-engraver.cc -- implement
   3   Horizontal_bracket_engraver
   4
   5   source file of the GNU LilyPond music typesetter
   6
   7   (c) 2002--2007 Han-Wen Nienhuys <hanwen@xs4all.nl>
   8 */
   9
  10 #include "engraver.hh"
  11 #include "international.hh"
  12 #include "note-column.hh"
  13 #include "pointer-group-interface.hh"
  14 #include "side-position-interface.hh"
  15 #include "stream-event.hh"
  16 #include "spanner.hh"
  17 #include "item.hh"
  18
  19 #include "translator.icc"
  20
  21 class Horizontal_bracket_engraver : public Engraver
  22 {
  23 public:
  24   TRANSLATOR_DECLARATIONS (Horizontal_bracket_engraver);
  25   vector<Spanner*> bracket_stack_;
  26   vector<Stream_event*> events_;
  27   vsize pop_count_;
  28   vsize push_count_;
  29
  30   void stop_translation_timestep ();
  31   void process_music ();
  32   DECLARE_ACKNOWLEDGER (note_column);
  33   DECLARE_TRANSLATOR_LISTENER (note_grouping);
  34 };
  35
  36 ADD_ACKNOWLEDGER (Horizontal_bracket_engraver, note_column);
  37 ADD_TRANSLATOR (Horizontal_bracket_engraver,
  38                 /* doc */
  39                 "Create horizontal brackets over notes for musical analysis"
  40                 " purposes.",
  41
  42                 /* create */
  43                 "HorizontalBracket ",
  44
  45                 /* read */
  46                 "",
  47
  48                 /* write */
  49                 ""
  50                 );
  51
  52 Horizontal_bracket_engraver::Horizontal_bracket_engraver ()
  53 {
  54   pop_count_ = 0;
  55   push_count_ = 0;
  56 }
  57
  58 IMPLEMENT_TRANSLATOR_LISTENER (Horizontal_bracket_engraver, note_grouping);
  59 void
  60 Horizontal_bracket_engraver::listen_note_grouping (Stream_event *ev)
  61 {
  62   Direction d = to_dir (ev->get_property ("span-direction"));
  63
  64   if (d == STOP)
  65     {
  66       pop_count_++;
  67       if (pop_count_ > bracket_stack_.size ())
  68         ev->origin ()->warning (_ ("do not have that many brackets"));
  69     }
  70   else
  71     {
  72       push_count_++;
  73       events_.push_back (ev);
  74     }
  75
  76   if (pop_count_ && push_count_)
  77     ev->origin ()->warning (_ ("conflicting note group events"));
  78 }
  79
  80 void
  81 Horizontal_bracket_engraver::acknowledge_note_column (Grob_info gi)
  82 {
  83   for (vsize i = 0; i < bracket_stack_.size (); i++)
  84     {
  85       Side_position_interface::add_support (bracket_stack_[i], gi.grob ());
  86       Pointer_group_interface::add_grob (bracket_stack_[i],
  87                                          ly_symbol2scm ("columns"), gi.grob ());
  88       add_bound_item (bracket_stack_[i],
  89                       gi.grob ());
  90     }
  91 }
  92
  93 void
  94 Horizontal_bracket_engraver::process_music ()
  95 {
  96   for (vsize k = 0; k < push_count_; k++)
  97     {
  98       Spanner *sp = make_spanner ("HorizontalBracket", events_[k]->self_scm ());
  99
 100       for (vsize i = 0; i < bracket_stack_.size (); i++)
 101         /* sp is the smallest, it should be added to the bigger brackets.  */
 102         Side_position_interface::add_support (bracket_stack_[i], sp);
 103       bracket_stack_.push_back (sp);
 104     }
 105 }
 106
 107 void
 108 Horizontal_bracket_engraver::stop_translation_timestep ()
 109 {
 110   for (int i = pop_count_; i--;)
 111     if (bracket_stack_.size ())
 112       bracket_stack_.pop_back ();
 113   pop_count_ = 0;
 114   push_count_ = 0;
 115 }
 116