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--2009 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_.set (0, 0);
  53 }
  54
  55 IMPLEMENT_TRANSLATOR_LISTENER (Trill_spanner_engraver, trill_span);
  56 void
  57 Trill_spanner_engraver::listen_trill_span (Stream_event *ev)
  58 {
  59   Direction d = to_dir (ev->get_property ("span-direction"));
  60   ASSIGN_EVENT_ONCE (event_drul_[d], ev);
  61 }
  62
  63 void
  64 Trill_spanner_engraver::acknowledge_note_column (Grob_info info)
  65 {
  66   if (span_)
  67     {
  68       Pointer_group_interface::add_grob (span_,
  69                                          ly_symbol2scm ("note-columns"),
  70                                          info.grob());
  71       if (!span_->get_bound (LEFT))
  72         add_bound_item (span_, info.grob ());
  73     }
  74   else if (finished_)
  75     {
  76       Pointer_group_interface::add_grob (finished_, ly_symbol2scm ("note-columns"),
  77                                          info.grob());
  78       if (!finished_->get_bound (RIGHT))
  79         add_bound_item (finished_, info.grob ());
  80     }
  81 }
  82
  83 void
  84 Trill_spanner_engraver::process_music ()
  85 {
  86   if (span_
  87       && (event_drul_[STOP] || event_drul_[START]))
  88     {
  89       Stream_event *ender = event_drul_[STOP];
  90       if (!ender)
  91         ender = event_drul_[START];
  92       finished_ = span_;
  93       announce_end_grob (finished_, ender->self_scm ());
  94       span_ = 0;
  95       current_event_ = 0;
  96     }
  97
  98   if (event_drul_[START])
  99     {
 100       current_event_ = event_drul_[START];
 101       span_ = make_spanner ("TrillSpanner", event_drul_[START]->self_scm ());
 102       Side_position_interface::set_axis (span_, Y_AXIS);
 103     }
 104 }
 105
 106 void
 107 Trill_spanner_engraver::typeset_all ()
 108 {
 109   if (finished_)
 110     {
 111       if (!finished_->get_bound (RIGHT))
 112         {
 113           Grob *e = unsmob_grob (get_property ("currentMusicalColumn"));
 114           finished_->set_bound (RIGHT, e);
 115         }
 116       finished_ = 0;
 117     }
 118 }
 119
 120 void
 121 Trill_spanner_engraver::stop_translation_timestep ()
 122 {
 123   if (span_ && !span_->get_bound (LEFT))
 124     {
 125       Grob *e = unsmob_grob (get_property ("currentMusicalColumn"));
 126       span_->set_bound (LEFT, e);
 127     }
 128
 129   typeset_all ();
 130   event_drul_.set (0, 0);
 131 }
 132
 133 void
 134 Trill_spanner_engraver::finalize ()
 135 {
 136   typeset_all ();
 137   if (span_)
 138     {
 139       Grob *e = unsmob_grob (get_property ("currentCommandColumn"));
 140       span_->set_bound (RIGHT, e);
 141     }
 142 }
 143
 144 ADD_ACKNOWLEDGER (Trill_spanner_engraver, note_column);
 145
 146 ADD_TRANSLATOR (Trill_spanner_engraver,
 147                 /* doc */
 148                 "Create trill spanner from an event.",
 149
 150                 /* create */
 151                 "TrillSpanner ",
 152
 153                 /* read */
 154                 "currentCommandColumn "
 155                 "currentMusicalColumn ",
 156
 157                 /* write */
 158                 ""
 159                 );