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--2006 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
  17 #include "translator.icc"
  18
  19 class Horizontal_bracket_engraver : public Engraver
  20 {
  21 public:
  22   TRANSLATOR_DECLARATIONS (Horizontal_bracket_engraver);
  23   vector<Spanner*> bracket_stack_;
  24   vector<Stream_event*> events_;
  25   vsize pop_count_;
  26   vsize push_count_;
  27
  28   void stop_translation_timestep ();
  29   void process_music ();
  30   DECLARE_ACKNOWLEDGER (note_column);
  31   DECLARE_TRANSLATOR_LISTENER (note_grouping);
  32 };
  33
  34 ADD_ACKNOWLEDGER (Horizontal_bracket_engraver, note_column);
  35 ADD_TRANSLATOR (Horizontal_bracket_engraver,
  36                 "Create horizontal brackets over notes for musical analysis purposes.",
  37                 "HorizontalBracket",
  38                 "note-grouping-event",
  39                 "",
  40                 "");
  41
  42 Horizontal_bracket_engraver::Horizontal_bracket_engraver ()
  43 {
  44   pop_count_ = 0;
  45   push_count_ = 0;
  46 }
  47
  48 IMPLEMENT_TRANSLATOR_LISTENER (Horizontal_bracket_engraver, note_grouping);
  49 void
  50 Horizontal_bracket_engraver::listen_note_grouping (Stream_event *ev)
  51 {
  52   Direction d = to_dir (ev->get_property ("span-direction"));
  53
  54   if (d == STOP)
  55     {
  56       pop_count_++;
  57       if (pop_count_ > bracket_stack_.size ())
  58         ev->origin ()->warning (_ ("don't have that many brackets"));
  59     }
  60   else
  61     {
  62       push_count_++;
  63       events_.push_back (ev);
  64     }
  65
  66   if (pop_count_ && push_count_)
  67     ev->origin ()->warning (_ ("conflicting note group events"));
  68 }
  69
  70 void
  71 Horizontal_bracket_engraver::acknowledge_note_column (Grob_info gi)
  72 {
  73   for (vsize i = 0; i < bracket_stack_.size (); i++)
  74     {
  75       Side_position_interface::add_support (bracket_stack_[i], gi.grob ());
  76       Pointer_group_interface::add_grob (bracket_stack_[i],
  77                                          ly_symbol2scm ("columns"), gi.grob ());
  78       add_bound_item (bracket_stack_[i],
  79                       gi.grob ());
  80     }
  81 }
  82
  83 void
  84 Horizontal_bracket_engraver::process_music ()
  85 {
  86   for (vsize k = 0; k < push_count_; k++)
  87     {
  88       Spanner *sp = make_spanner ("HorizontalBracket", events_[k]->self_scm ());
  89
  90       for (vsize i = 0; i < bracket_stack_.size (); i++)
  91         /* sp is the smallest, it should be added to the bigger brackets.  */
  92         Side_position_interface::add_support (bracket_stack_[i], sp);
  93       bracket_stack_.push_back (sp);
  94     }
  95 }
  96
  97 void
  98 Horizontal_bracket_engraver::stop_translation_timestep ()
  99 {
 100   for (int i = pop_count_; i--;)
 101     if (bracket_stack_.size ())
 102       bracket_stack_.pop_back ();
 103   pop_count_ = 0;
 104   push_count_ = 0;
 105 }
 106