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 }
  74
  75 ADD_ACKNOWLEDGER (Trill_spanner_engraver, note_column);
  76
  77
  78 void
  79 Trill_spanner_engraver::process_music ()
  80 {
  81   if (event_drul_[STOP])
  82     {
  83       if (!span_)
  84         event_drul_[STOP]->origin ()->warning (_ ("cannot find start of trill spanner"));
  85       else
  86         {
  87           finished_ = span_;
  88           span_ = 0;
  89           current_event_ = 0;
  90         }
  91     }
  92
  93   if (event_drul_[START])
  94     {
  95       if (current_event_)
  96         event_drul_[START]->origin ()->warning (_ ("already have a trill spanner"));
  97       else
  98         {
  99           current_event_ = event_drul_[START];
 100           span_ = make_spanner ("TrillSpanner", event_drul_[START]->self_scm ());
 101           Side_position_interface::set_axis (span_, Y_AXIS);
 102           event_drul_[START] = 0;
 103         }
 104     }
 105 }
 106
 107 void
 108 Trill_spanner_engraver::typeset_all ()
 109 {
 110   if (finished_)
 111     {
 112       if (!finished_->get_bound (RIGHT))
 113         {
 114           Grob *e = unsmob_grob (get_property ("currentMusicalColumn"));
 115           finished_->set_bound (RIGHT, e);
 116         }
 117       finished_ = 0;
 118     }
 119 }
 120
 121 void
 122 Trill_spanner_engraver::stop_translation_timestep ()
 123 {
 124   if (span_ && !span_->get_bound (LEFT))
 125     {
 126       Grob *e = unsmob_grob (get_property ("currentMusicalColumn"));
 127       span_->set_bound (LEFT, e);
 128     }
 129
 130   typeset_all ();
 131   event_drul_[START] = 0;
 132   event_drul_[STOP] = 0;
 133 }
 134
 135 void
 136 Trill_spanner_engraver::finalize ()
 137 {
 138   typeset_all ();
 139   if (span_)
 140     {
 141       finished_ = span_;
 142       typeset_all ();
 143     }
 144 }
 145
 146 ADD_TRANSLATOR (Trill_spanner_engraver,
 147                 /* doc */ "Create trill spanner from an event.",
 148                 /* create */
 149                 "TrillSpanner ",
 150                 /* read */ "",
 151                 /* write */ "");