lily/percent-repeat-engraver.cc

   1 /*
   2   new-chord-tremolo-engraver.cc -- implement Chord_tremolo_engraver
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 2000--2005 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   7 */
   8
   9
  10 #include "score-engraver.hh"
  11
  12 #include "repeated-music.hh"
  13 #include "global-context.hh"
  14 #include "warn.hh"
  15 #include "misc.hh"
  16 #include "spanner.hh"
  17 #include "item.hh"
  18 #include "percent-repeat-iterator.hh"
  19 #include "bar-line.hh"
  20 #include "side-position-interface.hh"
  21
  22 #include "translator.icc"
  23
  24 class Percent_repeat_engraver : public Engraver
  25 {
  26   void typeset_perc ();
  27 public:
  28   TRANSLATOR_DECLARATIONS (Percent_repeat_engraver);
  29
  30 protected:
  31   Music *repeat_;
  32
  33   /// moment (global time) where beam started.
  34   Moment start_mom_;
  35   Moment stop_mom_;
  36
  37   /// location within measure where beam started.
  38   Moment beam_start_location_;
  39   Moment next_moment_;
  40   Moment body_length_;
  41
  42   enum Repeat_sign_type
  43     {
  44       UNKNOWN,
  45       MEASURE,
  46       DOUBLE_MEASURE,
  47     };
  48   Repeat_sign_type repeat_sign_type_;
  49
  50   Item *double_percent_;
  51   Item *double_percent_counter_;
  52   Spanner *percent_;
  53   Spanner *percent_counter_;
  54   Spanner *finished_percent_;
  55   Spanner *finished_percent_counter_;
  56
  57   int count_;
  58   int total_count_;
  59 protected:
  60   virtual void finalize ();
  61   virtual bool try_music (Music *);
  62
  63   void stop_translation_timestep ();
  64   void start_translation_timestep ();
  65   void process_music ();
  66 };
  67
  68 Percent_repeat_engraver::Percent_repeat_engraver ()
  69 {
  70   percent_ = 0;
  71   percent_counter_ = 0;
  72
  73   finished_percent_ = 0;
  74   finished_percent_counter_ = 0;
  75
  76   double_percent_ = 0;
  77   double_percent_counter_ = 0;
  78
  79   repeat_ = 0;
  80   count_ = 0;
  81   total_count_ = 0;
  82 }
  83
  84 bool
  85 Percent_repeat_engraver::try_music (Music *m)
  86 {
  87   if (m->is_mus_type ("repeated-music")
  88       && m->get_property ("iterator-ctor")
  89       == Percent_repeat_iterator::constructor_proc
  90       && !repeat_)
  91     {
  92       body_length_ = Repeated_music::body_get_length (m);
  93       total_count_ = Repeated_music::repeat_count (m);
  94
  95       Moment now = now_mom ();
  96       start_mom_ = now;
  97       stop_mom_ = start_mom_ + Moment (total_count_) * body_length_;
  98       next_moment_ = start_mom_ + body_length_;
  99
 100       Moment meas_len (robust_scm2moment (get_property ("measureLength"), Moment (1)));
 101       if (meas_len == body_length_)
 102         repeat_sign_type_ = MEASURE;
 103       else if (Moment (2) * meas_len == body_length_)
 104         repeat_sign_type_ = DOUBLE_MEASURE;
 105       else
 106         {
 107           warning (_f ("can't handle a percent repeat of length: %s",
 108                        body_length_.to_string ()));
 109           return false;
 110         }
 111
 112       repeat_ = m;
 113
 114       Global_context *global = get_global_context ();
 115       for (int i = 1; i < total_count_; i++)
 116         {
 117           Moment m = next_moment_ + Moment (i) * body_length_;
 118           global->add_moment_to_process (m);
 119
 120           /* bars between % too.  */
 121           if (repeat_sign_type_ == DOUBLE_MEASURE)
 122             global->add_moment_to_process (m - meas_len);
 123         }
 124
 125       if (repeat_sign_type_ == DOUBLE_MEASURE)
 126         next_moment_ += meas_len;
 127
 128       count_ = 1;
 129       return true;
 130     }
 131
 132   return false;
 133 }
 134
 135 void
 136 Percent_repeat_engraver::process_music ()
 137 {
 138   if (repeat_ && now_mom () == next_moment_)
 139     {
 140       count_ ++;
 141       if (repeat_sign_type_ == MEASURE)
 142         {
 143           finished_percent_ = percent_;
 144           finished_percent_counter_ = percent_counter_;
 145
 146           typeset_perc ();
 147           percent_ = make_spanner ("PercentRepeat", repeat_->self_scm ());
 148
 149           Grob *col = unsmob_grob (get_property ("currentCommandColumn"));
 150           percent_->set_bound (LEFT, col);
 151
 152           if (total_count_ > 2)
 153             {
 154               percent_counter_
 155                 = make_spanner ("PercentRepeatCounter", repeat_->self_scm ());
 156
 157
 158               SCM text = scm_number_to_string (scm_from_int (count_),
 159                                                scm_from_int (10));
 160               percent_counter_->set_property ("text", text);
 161               percent_counter_->set_bound (LEFT, col);
 162               Side_position_interface::add_support (percent_counter_,
 163                                                     percent_);
 164               percent_counter_->set_parent (percent_, Y_AXIS);
 165             }
 166         }
 167       else if (repeat_sign_type_ == DOUBLE_MEASURE)
 168         {
 169           double_percent_ = make_item ("DoublePercentRepeat", repeat_->self_scm ());
 170
 171           if (total_count_ > 2)
 172             {
 173               double_percent_counter_
 174                 = make_item ("DoublePercentRepeatCounter",
 175                              repeat_->self_scm());
 176
 177               SCM text = scm_number_to_string (scm_from_int (count_),
 178                                                scm_from_int (10));
 179               double_percent_counter_->set_property ("text", text);
 180
 181               Side_position_interface::add_support (double_percent_counter_,
 182                                                     double_percent_);
 183               double_percent_counter_->set_parent (double_percent_, Y_AXIS);
 184               double_percent_counter_->set_parent (double_percent_, X_AXIS);
 185             }
 186
 187           /*
 188             forbid breaks on a % line. Should forbid all breaks, really.
 189
 190             Ugh. Why can't this be regular communication between
 191             contexts?
 192           */
 193           get_score_engraver ()->forbid_breaks ();
 194         }
 195       next_moment_ = next_moment_ + body_length_;
 196     }
 197 }
 198
 199 void
 200 Percent_repeat_engraver::finalize ()
 201 {
 202   typeset_perc ();
 203   if (percent_)
 204     {
 205       repeat_->origin ()->warning (_ ("unterminated percent repeat"));
 206       percent_->suicide ();
 207       percent_counter_->suicide();
 208     }
 209 }
 210
 211 void
 212 Percent_repeat_engraver::typeset_perc ()
 213 {
 214   if (finished_percent_)
 215     {
 216       Grob *col = unsmob_grob (get_property ("currentCommandColumn"));
 217
 218       finished_percent_->set_bound (RIGHT, col);
 219       finished_percent_ = 0;
 220
 221       if (finished_percent_counter_)
 222         finished_percent_counter_->set_bound (RIGHT, col);
 223
 224       finished_percent_counter_ = 0;
 225     }
 226
 227   double_percent_ = 0;
 228   double_percent_counter_ = 0;
 229 }
 230
 231 void
 232 Percent_repeat_engraver::start_translation_timestep ()
 233 {
 234   if (stop_mom_ == now_mom ())
 235     {
 236       if (percent_)
 237         {
 238           finished_percent_ = percent_;
 239           finished_percent_counter_ = percent_counter_;
 240
 241           typeset_perc ();
 242         }
 243       repeat_ = 0;
 244       percent_ = 0;
 245
 246       percent_counter_ = 0;
 247       repeat_sign_type_ = UNKNOWN;
 248     }
 249 }
 250
 251 void
 252 Percent_repeat_engraver::stop_translation_timestep ()
 253 {
 254   typeset_perc ();
 255 }
 256
 257 ADD_TRANSLATOR (Percent_repeat_engraver,
 258                 /* doc */ "Make whole bar and double bar repeats.",
 259                 /* create */
 260                 "PercentRepeat DoublePercentRepeat "
 261                 "PercentRepeatCounter DoublePercentRepeatCounter",
 262                 /* accept */ "repeated-music",
 263                 /* read */ "measureLength currentCommandColumn",
 264                 /* write */ "");