lily/trill-spanner-engraver.cc

   1 /*
   2   trill-spanner-engraver.cc -- implement Trill_spanner_engraver
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 2000--2007 Jan Nieuwenhuizen <janneke@gnu.org>
   7 */
   8
   9 /*
  10   C&P from text-spanner.cc
  11
  12   - todo: ending should be detected automatically? a new note
  13   automatically is the end of the trill?
  14 */
  15
  16 #include "engraver.hh"
  17
  18 #include "international.hh"
  19 #include "note-column.hh"
  20 #include "pointer-group-interface.hh"
  21 #include "side-position-interface.hh"
  22 #include "stream-event.hh"
  23 #include "spanner.hh"
  24
  25 #include "translator.icc"
  26
  27 class Trill_spanner_engraver : public Engraver
  28 {
  29 public:
  30   TRANSLATOR_DECLARATIONS (Trill_spanner_engraver);
  31 protected:
  32   virtual void finalize ();
  33   DECLARE_TRANSLATOR_LISTENER (trill_span);
  34   DECLARE_ACKNOWLEDGER (note_column);
  35
  36   void stop_translation_timestep ();
  37   void process_music ();
  38
  39 private:
  40   Spanner *span_;
  41   Spanner *finished_;
  42   Stream_event *current_event_;
  43   Drul_array<Stream_event *> event_drul_;
  44   void typeset_all ();
  45 };
  46
  47 Trill_spanner_engraver::Trill_spanner_engraver ()
  48 {
  49   finished_ = 0;
  50   current_event_ = 0;
  51   span_ = 0;
  52   event_drul_[START] = 0;
  53   event_drul_[STOP] = 0;
  54 }
  55
  56 IMPLEMENT_TRANSLATOR_LISTENER (Trill_spanner_engraver, trill_span);
  57 void
  58 Trill_spanner_engraver::listen_trill_span (Stream_event *ev)
  59 {
  60   Direction d = to_dir (ev->get_property ("span-direction"));
  61   ASSIGN_EVENT_ONCE (event_drul_[d], ev);
  62 }
  63
  64 void
  65 Trill_spanner_engraver::acknowledge_note_column (Grob_info info)
  66 {
  67   if (!span_)
  68     return;
  69
  70   Pointer_group_interface::add_grob (span_,
  71                                      ly_symbol2scm ("note-columns"),
  72                                      info.grob());
  73   add_bound_item (span_, info.grob ());
  74 }
  75
  76 void
  77 Trill_spanner_engraver::process_music ()
  78 {
  79   if (event_drul_[STOP])
  80     {
  81       if (!span_)
  82         event_drul_[STOP]->origin ()->warning (_ ("cannot find start of trill spanner"));
  83       else
  84         {
  85           finished_ = span_;
  86           span_ = 0;
  87           current_event_ = 0;
  88         }
  89     }
  90
  91   if (event_drul_[START])
  92     {
  93       if (current_event_)
  94         event_drul_[START]->origin ()->warning (_ ("already have a trill spanner"));
  95       else
  96         {
  97           current_event_ = event_drul_[START];
  98           span_ = make_spanner ("TrillSpanner", event_drul_[START]->self_scm ());
  99           Side_position_interface::set_axis (span_, Y_AXIS);
 100           event_drul_[START] = 0;
 101         }
 102     }
 103 }
 104
 105 void
 106 Trill_spanner_engraver::typeset_all ()
 107 {
 108   if (finished_)
 109     {
 110       if (!finished_->get_bound (RIGHT))
 111         {
 112           Grob *e = unsmob_grob (get_property ("currentMusicalColumn"));
 113           finished_->set_bound (RIGHT, e);
 114         }
 115       finished_ = 0;
 116     }
 117 }
 118
 119 void
 120 Trill_spanner_engraver::stop_translation_timestep ()
 121 {
 122   if (span_ && !span_->get_bound (LEFT))
 123     {
 124       Grob *e = unsmob_grob (get_property ("currentMusicalColumn"));
 125       span_->set_bound (LEFT, e);
 126     }
 127
 128   typeset_all ();
 129   event_drul_[START] = 0;
 130   event_drul_[STOP] = 0;
 131 }
 132
 133 void
 134 Trill_spanner_engraver::finalize ()
 135 {
 136   typeset_all ();
 137   if (span_)
 138     {
 139       finished_ = span_;
 140       typeset_all ();
 141     }
 142 }
 143
 144 ADD_ACKNOWLEDGER (Trill_spanner_engraver, note_column);
 145
 146 ADD_TRANSLATOR (Trill_spanner_engraver,
 147                 /* doc */ "Create trill spanner from an event.",
 148                 /* create */
 149                 "TrillSpanner ",
 150                 /* read */ "",
 151                 /* write */ "");