lily/dynamic-align-engraver.cc

   1 /*
   2   dynamic-align-engraver.cc -- implement Dynamic_align_engraver
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 2008--2009 Han-Wen Nienhuys <hanwen@lilypond.org>
   7
   8 */
   9
  10 #include <set>
  11
  12 #include "engraver.hh"
  13
  14 #include "axis-group-interface.hh"
  15 #include "directional-element-interface.hh"
  16 #include "item.hh"
  17 #include "side-position-interface.hh"
  18 #include "spanner.hh"
  19 #include "stream-event.hh"
  20
  21 #include "translator.icc"
  22
  23 class Dynamic_align_engraver : public Engraver
  24 {
  25   TRANSLATOR_DECLARATIONS (Dynamic_align_engraver);
  26   DECLARE_ACKNOWLEDGER (note_column);
  27   DECLARE_ACKNOWLEDGER (dynamic);
  28   DECLARE_END_ACKNOWLEDGER (dynamic);
  29
  30 protected:
  31   virtual void stop_translation_timestep ();
  32
  33 private:
  34   void create_line_spanner (Stream_event *cause);
  35   Spanner* line_;
  36
  37   vector<Spanner*> ended_;
  38   vector<Spanner*> started_;
  39   vector<Grob*> scripts_;
  40   vector<Grob*> support_;
  41
  42   set<Spanner*> running_;
  43 };
  44
  45 Dynamic_align_engraver::Dynamic_align_engraver ()
  46 {
  47   line_ = 0;
  48 }
  49
  50 ADD_ACKNOWLEDGER (Dynamic_align_engraver, dynamic);
  51 ADD_ACKNOWLEDGER (Dynamic_align_engraver, note_column);
  52 ADD_END_ACKNOWLEDGER (Dynamic_align_engraver, dynamic);
  53
  54 void
  55 Dynamic_align_engraver::create_line_spanner (Stream_event* event)
  56 {
  57   if (!line_)
  58     line_ = make_spanner ("DynamicLineSpanner",
  59                           event ? event->self_scm() : SCM_EOL);
  60 }
  61
  62 void
  63 Dynamic_align_engraver::acknowledge_end_dynamic (Grob_info info)
  64 {
  65   if (Spanner::has_interface(info.grob()))
  66     ended_.push_back (info.spanner ());
  67 }
  68
  69 void
  70 Dynamic_align_engraver::acknowledge_note_column (Grob_info info)
  71 {
  72   support_.push_back (info.grob ());
  73 }
  74
  75 void
  76 Dynamic_align_engraver::acknowledge_dynamic (Grob_info info)
  77 {
  78   Stream_event *cause = info.event_cause ();
  79   create_line_spanner (cause);
  80   if (Spanner::has_interface(info.grob()))
  81     started_.push_back (info.spanner ());
  82   else if (info.item())
  83     scripts_.push_back (info.item());
  84   else
  85     info.grob ()->programming_error ("Unknown dynamic grob.");
  86
  87   Axis_group_interface::add_element (line_, info.grob ());
  88
  89   if (cause)
  90     {
  91       if (Direction d = to_dir (cause->get_property ("direction")))
  92         set_grob_direction (line_, d);
  93     }
  94 }
  95
  96 void
  97 Dynamic_align_engraver::stop_translation_timestep ()
  98 {
  99   for (vsize i = 0; i < started_.size(); i++)
 100     running_.insert (started_[i]);
 101   for (vsize i = 0; i < ended_.size(); i++)
 102     {
 103       Spanner *sp = ended_[i];
 104
 105       set<Spanner*>::iterator it  = running_.find (sp);
 106       if (it != running_.end())
 107         running_.erase (it);
 108       else
 109         started_[i]->programming_error ("Lost track of this dynamic spanner.");
 110     }
 111
 112   bool end = line_ && running_.empty ();
 113   Direction d = LEFT;
 114   do
 115     {
 116       if (line_
 117           && ((d == LEFT && !line_->get_bound (LEFT))
 118               || (end && d == RIGHT && !line_->get_bound (RIGHT))))
 119         {
 120           vector<Spanner*> const &spanners =
 121             (d == LEFT) ? started_ : ended_;
 122
 123           Grob *bound = 0;
 124           if (scripts_.size())
 125             bound = scripts_[0];
 126           else if (spanners.size())
 127             bound = spanners[0]->get_bound (d);
 128           else
 129             {
 130               programming_error ("Started DynamicLineSpanner but have no left bound.");
 131               bound = unsmob_grob (get_property ("currentMusicalColumn"));
 132             }
 133
 134           line_->set_bound (d, bound);
 135         }
 136     }
 137   while (flip (&d) != LEFT);
 138
 139   for (vsize i = 0; line_ && i < support_.size (); i++)
 140     Side_position_interface::add_support (line_, support_[i]);
 141
 142   if (end)
 143     line_ = 0;
 144
 145   ended_.clear ();
 146   started_.clear ();
 147   scripts_.clear ();
 148   support_.clear ();
 149 }
 150
 151
 152 ADD_TRANSLATOR (Dynamic_align_engraver,
 153                 /* doc */
 154                 "Align hairpins and dynamic texts on a horizontal line",
 155
 156                 /* create */
 157                 "DynamicLineSpanner ",
 158
 159                 /* read */
 160                 "currentMusicalColumn ",
 161
 162                 /* write */
 163                 ""
 164                 );