lily/piano-pedal-align-engraver.cc

   1 /*
   2   piano-pedal-align-engraver.cc -- implement  Piano_pedal_align_engraver
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 2006--2008 Han-Wen Nienhuys <hanwen@lilypond.org>
   7
   8 */
   9
  10
  11 #include "engraver.hh"
  12
  13 #include "spanner.hh"
  14 #include "item.hh"
  15 #include "side-position-interface.hh"
  16 #include "stream-event.hh"
  17 #include "warn.hh"
  18 #include "axis-group-interface.hh"
  19
  20
  21 /*
  22   TODO:
  23
  24
  25   * Detach from pedal specifics,
  26
  27   * Also use this engraver for dynamics.
  28
  29 */
  30
  31
  32 struct Pedal_align_info
  33 {
  34   Spanner *line_spanner_;
  35   Grob *carrying_item_;
  36   Spanner *carrying_spanner_;
  37   Spanner *finished_carrying_spanner_;
  38
  39   Pedal_align_info ()
  40   {
  41     clear ();
  42
  43   }
  44   void clear ()
  45   {
  46     line_spanner_ = 0;
  47     carrying_spanner_ = 0;
  48     carrying_item_ = 0;
  49     finished_carrying_spanner_ = 0;
  50   }
  51   bool is_finished ()
  52   {
  53     bool do_continue = carrying_item_;
  54
  55     do_continue |= (carrying_spanner_ && !finished_carrying_spanner_);
  56     do_continue |= (carrying_spanner_ && finished_carrying_spanner_ != carrying_spanner_);
  57
  58     return !do_continue;
  59   }
  60 };
  61
  62 class Piano_pedal_align_engraver : public Engraver
  63 {
  64 public:
  65   TRANSLATOR_DECLARATIONS (Piano_pedal_align_engraver);
  66
  67 protected:
  68   virtual void finalize ();
  69
  70   DECLARE_ACKNOWLEDGER (piano_pedal_script);
  71   DECLARE_ACKNOWLEDGER (piano_pedal_bracket);
  72   DECLARE_ACKNOWLEDGER (note_column);
  73
  74   DECLARE_END_ACKNOWLEDGER (piano_pedal_bracket);
  75
  76   void stop_translation_timestep ();
  77   void start_translation_timestep ();
  78
  79 private:
  80   enum Pedal_type {
  81     SOSTENUTO,
  82     SUSTAIN,
  83     UNA_CORDA,
  84     NUM_PEDAL_TYPES
  85   };
  86   Pedal_align_info pedal_info_[NUM_PEDAL_TYPES];
  87   vector<Grob *> supports_;
  88
  89   Pedal_type get_grob_pedal_type (Grob_info g);
  90   Spanner *make_line_spanner (Pedal_type t, SCM);
  91 };
  92
  93 Piano_pedal_align_engraver::Piano_pedal_align_engraver ()
  94 {
  95 }
  96
  97 void
  98 Piano_pedal_align_engraver::start_translation_timestep ()
  99 {
 100   supports_.clear ();
 101 }
 102
 103 void
 104 Piano_pedal_align_engraver::stop_translation_timestep ()
 105 {
 106   for (int i = 0; i < NUM_PEDAL_TYPES; i ++)
 107     {
 108       if (pedal_info_[i].line_spanner_)
 109         {
 110
 111           if (pedal_info_[i].carrying_item_)
 112             {
 113               if (!pedal_info_[i].line_spanner_->get_bound (LEFT))
 114                 pedal_info_[i].line_spanner_->set_bound (LEFT,
 115                                                          pedal_info_[i].carrying_item_);
 116
 117               pedal_info_[i].line_spanner_->set_bound (RIGHT,
 118                                                        pedal_info_[i].carrying_item_);
 119             }
 120           else if (pedal_info_[i].carrying_spanner_
 121                    || pedal_info_[i].finished_carrying_spanner_
 122                    )
 123             {
 124               if (!pedal_info_[i].line_spanner_->get_bound (LEFT)
 125                   && pedal_info_[i].carrying_spanner_->get_bound (LEFT))
 126                 pedal_info_[i].line_spanner_->set_bound (LEFT,
 127                                                          pedal_info_[i].carrying_spanner_->get_bound (LEFT));
 128
 129
 130               if (pedal_info_[i].finished_carrying_spanner_)
 131                 pedal_info_[i].line_spanner_->set_bound (RIGHT,
 132                                                          pedal_info_[i].finished_carrying_spanner_->get_bound (RIGHT));
 133             }
 134
 135           for (vsize j = 0; j < supports_.size (); j++)
 136             {
 137               Side_position_interface::add_support (pedal_info_[i].line_spanner_, supports_[j]);
 138             }
 139
 140           if (pedal_info_[i].is_finished ())
 141             {
 142               announce_end_grob (pedal_info_[i].line_spanner_, SCM_EOL);
 143               pedal_info_[i].clear ();
 144             }
 145         }
 146
 147       pedal_info_[i].carrying_item_ = 0;
 148     }
 149 }
 150
 151 Piano_pedal_align_engraver::Pedal_type
 152 Piano_pedal_align_engraver::get_grob_pedal_type (Grob_info g)
 153 {
 154   if (g.event_cause ()->in_event_class ("sostenuto-event"))
 155     return SOSTENUTO;
 156   if (g.event_cause ()->in_event_class ("sustain-event"))
 157     return SUSTAIN;
 158   if (g.event_cause ()->in_event_class ("una-corda-event"))
 159     return UNA_CORDA;
 160
 161   programming_error ("Unknown piano pedal type. Defaulting to sustain");
 162   return SUSTAIN;
 163 }
 164
 165
 166 Spanner *
 167 Piano_pedal_align_engraver::make_line_spanner (Pedal_type t, SCM cause)
 168 {
 169   Spanner *sp = pedal_info_[t].line_spanner_;
 170   if (!sp)
 171     {
 172       switch (t)
 173         {
 174         case (SOSTENUTO):
 175           sp = make_spanner ("SostenutoPedalLineSpanner", cause);
 176           break;
 177         case (SUSTAIN):
 178           sp = make_spanner ("SustainPedalLineSpanner", cause);
 179           break;
 180         case (UNA_CORDA):
 181           sp = make_spanner ("UnaCordaPedalLineSpanner", cause);
 182           break;
 183         default:
 184           programming_error ("No pedal type fonud!") ;
 185           return sp;
 186         }
 187
 188       pedal_info_[t].line_spanner_ = sp;
 189     }
 190
 191   return sp;
 192 }
 193
 194 void
 195 Piano_pedal_align_engraver::acknowledge_note_column (Grob_info gi)
 196 {
 197   supports_.push_back (gi.grob ());
 198 }
 199
 200 void
 201 Piano_pedal_align_engraver::acknowledge_piano_pedal_bracket (Grob_info gi)
 202 {
 203   Pedal_type type = get_grob_pedal_type (gi);
 204   Grob *sp = make_line_spanner (type, gi.grob ()->self_scm ());
 205
 206   Axis_group_interface::add_element (sp, gi.grob ());
 207   pedal_info_[type].carrying_spanner_ = gi.spanner ();
 208 }
 209
 210 void
 211 Piano_pedal_align_engraver::acknowledge_end_piano_pedal_bracket (Grob_info gi)
 212 {
 213   Pedal_type type = get_grob_pedal_type (gi);
 214   pedal_info_[type].finished_carrying_spanner_ = gi.spanner ();
 215 }
 216
 217 void
 218 Piano_pedal_align_engraver::acknowledge_piano_pedal_script (Grob_info gi)
 219 {
 220   Pedal_type type = get_grob_pedal_type (gi);
 221
 222   Grob *sp = make_line_spanner (type, gi.grob ()->self_scm ());
 223   Axis_group_interface::add_element (sp, gi.grob ());
 224   pedal_info_[type].carrying_item_ = gi.grob ();
 225 }
 226
 227
 228 void
 229 Piano_pedal_align_engraver::finalize ()
 230 {
 231  for (int i = 0; i < NUM_PEDAL_TYPES; i ++)
 232     {
 233       if (pedal_info_[i].line_spanner_)
 234         {
 235           SCM cc = get_property ("currentCommandColumn");
 236           Item *c = unsmob_item (cc);
 237           pedal_info_[i].line_spanner_->set_bound (RIGHT, c);
 238
 239           pedal_info_[i].clear ();
 240         }
 241     }
 242 }
 243
 244 #include "translator.icc"
 245
 246 ADD_ACKNOWLEDGER (Piano_pedal_align_engraver, note_column);
 247 ADD_ACKNOWLEDGER (Piano_pedal_align_engraver, piano_pedal_bracket);
 248 ADD_ACKNOWLEDGER (Piano_pedal_align_engraver, piano_pedal_script);
 249
 250 ADD_END_ACKNOWLEDGER (Piano_pedal_align_engraver, piano_pedal_bracket);
 251
 252
 253 ADD_TRANSLATOR (Piano_pedal_align_engraver,
 254                 /* doc */
 255                 "Align piano pedal symbols and brackets.",
 256
 257                 /* create */
 258                 "SostenutoPedalLineSpanner "
 259                 "SustainPedalLineSpanner "
 260                 "UnaCordaPedalLineSpanner ",
 261
 262                 /* read */
 263                 "currentCommandColumn ",
 264
 265                 /* write */
 266                 ""
 267                 );