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     Pointer_group_interface::add_grob (span_,
  69                                        ly_symbol2scm ("note-columns"),
  70                                        info.grob());
  71     add_bound_item (span_, info.grob ());
  72   } else if (finished_) {
  73     Pointer_group_interface::add_grob (finished_, ly_symbol2scm ("note-columns"),
  74                                        info.grob());
  75     add_bound_item (finished_, info.grob ());
  76   }
  77 }
  78
  79 void
  80 Trill_spanner_engraver::process_music ()
  81 {
  82   if (event_drul_[STOP])
  83     {
  84       if (!span_)
  85         event_drul_[STOP]->origin ()->warning (_ ("cannot find start of trill spanner"));
  86       else
  87         {
  88           finished_ = span_;
  89           span_ = 0;
  90           current_event_ = 0;
  91         }
  92     }
  93
  94   if (event_drul_[START])
  95     {
  96       if (current_event_)
  97         event_drul_[START]->origin ()->warning (_ ("already have a trill spanner"));
  98       else
  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           event_drul_[START] = 0;
 104         }
 105     }
 106 }
 107
 108 void
 109 Trill_spanner_engraver::typeset_all ()
 110 {
 111   if (finished_)
 112     {
 113       if (!finished_->get_bound (RIGHT))
 114         {
 115           Grob *e = unsmob_grob (get_property ("currentMusicalColumn"));
 116           finished_->set_bound (RIGHT, e);
 117         }
 118       finished_ = 0;
 119     }
 120 }
 121
 122 void
 123 Trill_spanner_engraver::stop_translation_timestep ()
 124 {
 125   if (span_ && !span_->get_bound (LEFT))
 126     {
 127       Grob *e = unsmob_grob (get_property ("currentMusicalColumn"));
 128       span_->set_bound (LEFT, e);
 129     }
 130
 131   typeset_all ();
 132   event_drul_[START] = 0;
 133   event_drul_[STOP] = 0;
 134 }
 135
 136 void
 137 Trill_spanner_engraver::finalize ()
 138 {
 139   typeset_all ();
 140   if (span_)
 141     {
 142       finished_ = span_;
 143       typeset_all ();
 144     }
 145 }
 146
 147 ADD_ACKNOWLEDGER (Trill_spanner_engraver, note_column);
 148
 149 ADD_TRANSLATOR (Trill_spanner_engraver,
 150                 /* doc */ "Create trill spanner from an event.",
 151                 /* create */
 152                 "TrillSpanner ",
 153                 /* read */ "",
 154                 /* write */ "");