lily/multi-measure-rest-engraver.cc

   1 /*
   2   multi_measure_rest-engraver.cc -- implement Multi_measure_rest_engraver
   3
   4   (c) 1998--2009 Jan Nieuwenhuizen <janneke@gnu.org>
   5   Han-Wen Nienhuys <hanwen@xs4all.nl>
   6 */
   7
   8 #include "multi-measure-rest.hh"
   9 #include "paper-column.hh"
  10 #include "engraver-group.hh"
  11 #include "side-position-interface.hh"
  12 #include "staff-symbol-referencer.hh"
  13 #include "stream-event.hh"
  14 #include "moment.hh"
  15 #include "spanner.hh"
  16
  17 #include "translator.icc"
  18
  19 /**
  20    The name says it all: make multi measure rests
  21 */
  22 class Multi_measure_rest_engraver : public Engraver
  23 {
  24 public:
  25   TRANSLATOR_DECLARATIONS (Multi_measure_rest_engraver);
  26
  27 protected:
  28   void process_music ();
  29   void stop_translation_timestep ();
  30   void start_translation_timestep ();
  31   virtual void finalize ();
  32   DECLARE_TRANSLATOR_LISTENER (multi_measure_rest);
  33   DECLARE_TRANSLATOR_LISTENER (multi_measure_text);
  34
  35 private:
  36   Stream_event *rest_ev_;
  37   vector<Stream_event*> text_events_;
  38   int start_measure_;
  39   Rational last_main_moment_;
  40   Moment stop_moment_;
  41
  42   bool bar_seen_;
  43   Item *last_command_item_;
  44   Spanner *last_rest_;
  45   Spanner *mmrest_;
  46
  47   vector<Spanner*> numbers_;
  48   vector<Spanner*> last_numbers_;
  49 };
  50
  51 Multi_measure_rest_engraver::Multi_measure_rest_engraver ()
  52 {
  53   last_command_item_ = 0;
  54
  55   /*
  56     For the start of a score.
  57   */
  58   bar_seen_ = true;
  59   start_measure_ = 0;
  60   mmrest_ = 0;
  61   last_rest_ = 0;
  62   rest_ev_ = 0;
  63 }
  64
  65 IMPLEMENT_TRANSLATOR_LISTENER (Multi_measure_rest_engraver, multi_measure_rest);
  66 void
  67 Multi_measure_rest_engraver::listen_multi_measure_rest (Stream_event *ev)
  68 {
  69   /* FIXME: Should use ASSIGN_EVENT_ONCE. Can't do that yet because of
  70      the kill-mm-rests hack in part-combine-iterator. */
  71   rest_ev_ = ev;
  72   stop_moment_ = now_mom () + get_event_length (rest_ev_, now_mom ());
  73   /*
  74   if (ASSIGN_EVENT_ONCE (rest_ev_, ev))
  75     stop_moment_ = now_mom () + get_event_length (rest_ev_);
  76   */
  77 }
  78
  79 IMPLEMENT_TRANSLATOR_LISTENER (Multi_measure_rest_engraver, multi_measure_text);
  80 void
  81 Multi_measure_rest_engraver::listen_multi_measure_text (Stream_event *ev)
  82 {
  83   text_events_.push_back (ev);
  84 }
  85
  86 void
  87 Multi_measure_rest_engraver::process_music ()
  88 {
  89   if (rest_ev_ && !mmrest_
  90       && stop_moment_ > now_mom ())
  91     {
  92       mmrest_ = make_spanner ("MultiMeasureRest", rest_ev_->self_scm ());
  93
  94       Spanner *sp
  95         = make_spanner ("MultiMeasureRestNumber", rest_ev_->self_scm ());
  96       numbers_.push_back (sp);
  97
  98       if (text_events_.size ())
  99         {
 100           for (vsize i = 0; i < text_events_.size (); i++)
 101             {
 102               Stream_event *e = text_events_[i];
 103               Spanner *sp
 104                 = make_spanner ("MultiMeasureRestText", e->self_scm ());
 105               SCM t = e->get_property ("text");
 106               SCM dir = e->get_property ("direction");
 107               sp->set_property ("text", t);
 108               if (is_direction (dir))
 109                 sp->set_property ("direction", dir);
 110
 111               numbers_.push_back (sp);
 112             }
 113
 114           /*
 115             Stack different scripts.
 116           */
 117           Direction d = DOWN;
 118           do
 119             {
 120               Grob *last = 0;
 121               for (vsize i = 0; i < numbers_.size (); i++)
 122                 {
 123                   if (scm_from_int (d) == numbers_[i]->get_property ("direction"))
 124                     {
 125                       if (last)
 126                         Side_position_interface::add_support (numbers_[i], last);
 127                       last = numbers_[i];
 128                     }
 129                 }
 130             }
 131           while (flip (&d) != DOWN);
 132         }
 133
 134       for (vsize i = 0; i < numbers_.size (); i++)
 135         {
 136           Side_position_interface::add_support (numbers_[i], mmrest_);
 137           numbers_[i]->set_parent (mmrest_, Y_AXIS);
 138         }
 139
 140       start_measure_
 141         = scm_to_int (get_property ("internalBarNumber"));
 142     }
 143
 144   bar_seen_ = bar_seen_ || scm_is_string (get_property ("whichBar"));
 145 }
 146
 147 void
 148 Multi_measure_rest_engraver::stop_translation_timestep ()
 149 {
 150   /* We cannot do this earlier, as breakableSeparationItem is not yet
 151      there.
 152
 153      Actually, we no longer use breakableSeparationItem -- should this be moved?
 154      -- jneem */
 155   if (bar_seen_)
 156     {
 157       Grob *cmc = unsmob_grob (get_property ("currentCommandColumn"));
 158
 159       /* Ugh, this is a kludge - need this for multi-measure-rest-grace.ly  */
 160       last_command_item_ = dynamic_cast<Item *> (cmc);
 161     }
 162
 163   if (last_command_item_ && (mmrest_ || last_rest_))
 164     {
 165       if (last_rest_)
 166         {
 167           add_bound_item (last_rest_, last_command_item_);
 168           for (vsize i = 0; i < last_numbers_.size (); i++)
 169             add_bound_item (last_numbers_[i], last_command_item_);
 170         }
 171
 172       if (mmrest_)
 173         {
 174           add_bound_item (mmrest_, last_command_item_);
 175           for (vsize i = 0; i < numbers_.size (); i++)
 176             add_bound_item (numbers_[i], last_command_item_);
 177
 178           last_command_item_ = 0;
 179         }
 180     }
 181
 182   Moment mp (robust_scm2moment (get_property ("measurePosition"), Moment (0)));
 183   if (last_rest_)
 184     {
 185       last_rest_ = 0;
 186       last_numbers_.clear ();
 187     }
 188
 189   text_events_.clear ();
 190   bar_seen_ = false;
 191 }
 192
 193 void
 194 Multi_measure_rest_engraver::start_translation_timestep ()
 195 {
 196   if (now_mom ().main_part_ >= stop_moment_.main_part_)
 197     rest_ev_ = 0;
 198
 199   Moment mp (robust_scm2moment (get_property ("measurePosition"), Moment (0)));
 200
 201   Moment now = now_mom ();
 202   if (mmrest_
 203       && now.main_part_ != last_main_moment_
 204       && mp.main_part_ == Rational (0))
 205     {
 206       last_rest_ = mmrest_;
 207       last_numbers_ = numbers_;
 208
 209       int cur = scm_to_int (get_property ("internalBarNumber"));
 210       int num = cur - start_measure_;
 211
 212       /*
 213         We can't plug a markup directly into the grob, since the
 214         measure-count determines the formatting of the mmrest.
 215       */
 216       last_rest_->set_property ("measure-count", scm_from_int (num));
 217
 218       SCM sml = get_property ("measureLength");
 219       Rational ml = (unsmob_moment (sml)) ? unsmob_moment (sml)->main_part_ : Rational (1);
 220       if (ml >= Rational (2))
 221         last_rest_->set_property ("use-breve-rest", SCM_BOOL_T);
 222
 223       mmrest_ = 0;
 224       numbers_.clear ();
 225
 226       Grob *last = last_numbers_.size () ? last_numbers_[0] : 0;
 227       if (last && last->get_property ("text") == SCM_EOL)
 228         {
 229           SCM thres = get_property ("restNumberThreshold");
 230           int t = 1;
 231           if (scm_is_number (thres))
 232             t = scm_to_int (thres);
 233
 234           if (num <= t)
 235             last->suicide ();
 236           else
 237             {
 238               SCM text
 239                 = scm_number_to_string (scm_from_int (num), scm_from_int (10));
 240               last->set_property ("text", text);
 241             }
 242         }
 243     }
 244
 245   last_main_moment_ = now.main_part_;
 246 }
 247
 248 void
 249 Multi_measure_rest_engraver::finalize ()
 250 {
 251 }
 252
 253 ADD_TRANSLATOR (Multi_measure_rest_engraver,
 254                 /* doc */
 255                 "Engrave multi-measure rests that are produced with"
 256                 " @samp{R}.  It reads @code{measurePosition} and"
 257                 " @code{internalBarNumber} to determine what number to print"
 258                 " over the @ref{MultiMeasureRest}.  Reads @code{measureLength}"
 259                 " to determine whether it should use a whole rest or a breve"
 260                 " rest to represent one measure.",
 261
 262                 /* create */
 263                 "MultiMeasureRest "
 264                 "MultiMeasureRestNumber "
 265                 "MultiMeasureRestText ",
 266
 267                 /* read */
 268                 "internalBarNumber "
 269                 "restNumberThreshold "
 270                 "currentCommandColumn "
 271                 "measurePosition "
 272                 "measureLength ",
 273
 274                 /* write */
 275                 ""
 276                 );