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--2005 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   8 */
   9
  10 #include "engraver.hh"
  11 #include "side-position-interface.hh"
  12 #include "note-column.hh"
  13 #include "pointer-group-interface.hh"
  14
  15 #include "translator.icc"
  16
  17 class Horizontal_bracket_engraver : public Engraver
  18 {
  19 public:
  20   TRANSLATOR_DECLARATIONS (Horizontal_bracket_engraver);
  21   Link_array<Spanner> bracket_stack_;
  22   Link_array<Music> events_;
  23   int pop_count_;
  24   int push_count_;
  25
  26   virtual bool try_music (Music *);
  27   PRECOMPUTED_VIRTUAL void stop_translation_timestep ();
  28   PRECOMPUTED_VIRTUAL void process_music ();
  29   DECLARE_ACKNOWLEDGER(note_column);
  30 };
  31
  32
  33 ADD_ACKNOWLEDGER(Horizontal_bracket_engraver,note_column);
  34 ADD_TRANSLATOR (Horizontal_bracket_engraver,
  35                 "Create horizontal brackets over notes for musical analysis purposes.",
  36                 "HorizontalBracket",
  37                 "note-grouping-event",
  38                 "",
  39                 "");
  40
  41 Horizontal_bracket_engraver::Horizontal_bracket_engraver ()
  42 {
  43   pop_count_ = 0;
  44   push_count_ = 0;
  45 }
  46
  47 bool
  48 Horizontal_bracket_engraver::try_music (Music *m)
  49 {
  50   if (m->is_mus_type ("note-grouping-event"))
  51     {
  52       Direction d = to_dir (m->get_property ("span-direction"));
  53
  54       if (d == STOP)
  55         {
  56           pop_count_++;
  57           if (pop_count_ > bracket_stack_.size ())
  58             m->origin ()->warning (_ ("don't have that many brackets"));
  59         }
  60       else
  61         {
  62           push_count_++;
  63           events_.push (m);
  64         }
  65
  66       if (pop_count_ && push_count_)
  67         m->origin ()->warning (_ ("conflicting note group events"));
  68
  69       return true;
  70     }
  71   return false;
  72 }
  73
  74 void
  75 Horizontal_bracket_engraver::acknowledge_note_column (Grob_info gi)
  76 {
  77   for (int i = 0; i < bracket_stack_.size (); i++)
  78     {
  79       Side_position_interface::add_support (bracket_stack_[i], gi.grob ());
  80       Pointer_group_interface::add_grob (bracket_stack_[i],
  81                                          ly_symbol2scm ("columns"), gi.grob ());
  82       add_bound_item (bracket_stack_[i],
  83                       gi.grob ());
  84     }
  85 }
  86
  87 void
  88 Horizontal_bracket_engraver::process_music ()
  89 {
  90   for (int k = 0; k < push_count_; k++)
  91     {
  92       Spanner *sp = make_spanner ("HorizontalBracket", events_[k]->self_scm ());
  93
  94       for (int i = 0; i < bracket_stack_.size (); i++)
  95         {
  96           /*
  97             sp is the smallest, it should be added to the bigger brackets.
  98           */
  99           Side_position_interface::add_support (bracket_stack_[i], sp);
 100         }
 101       bracket_stack_.push (sp);
 102     }
 103 }
 104
 105 void
 106 Horizontal_bracket_engraver::stop_translation_timestep ()
 107 {
 108   for (int i = pop_count_; i--;)
 109     {
 110       if (bracket_stack_.size ())
 111         bracket_stack_.pop ();
 112     }
 113   pop_count_ = 0;
 114   push_count_ = 0;
 115 }
 116