''

[lilypond.git] / lily / timing-engraver.cc

diff --git a/lily/timing-engraver.cc b/lily/timing-engraver.cc
index acf416664a65f360794bd0fabff5ba36d86db412..9a381cede41a4ba24e50fd4183b3d144179ef014 100644 (file)
--- a/lily/timing-engraver.cc
+++ b/lily/timing-engraver.cc
@@ -3,50 +3,76 @@
 
   source file of the GNU LilyPond music typesetter
 
-  (c)  1997--2000 Han-Wen Nienhuys <hanwen@cs.uu.nl>
+  (c)  1997--2002 Han-Wen Nienhuys <hanwen@cs.uu.nl>
 */
-#include <iostream.h>
-
 #include "translator-group.hh"
 #include "command-request.hh"
-#include "score-element-info.hh"
+#include "grob-info.hh"
 #include "multi-measure-rest.hh"
 #include "timing-translator.hh"
 #include "engraver.hh"
+#include "grob.hh"
 
 /**
   Do time bookkeeping
  */
 class Timing_engraver : public Timing_translator, public Engraver
-{   
+{
 protected:
-  virtual void do_post_move_processing ();
-  virtual void do_pre_move_processing ();
+  /*
+    Needed to know whether we're advancing in grace notes, or not.
+   */
+  Moment last_moment_;
+  
+  virtual void start_translation_timestep ();
+  virtual void stop_translation_timestep ();
+
 public:
-  VIRTUAL_COPY_CONS(Translator);
+  TRANSLATOR_DECLARATIONS(Timing_engraver);
 };
 
-ADD_THIS_TRANSLATOR(Timing_engraver);
+
+Timing_engraver::Timing_engraver ()
+{
+  last_moment_.main_part_ = Rational (-1);
+}
+
+
 
 void
-Timing_engraver::do_post_move_processing( )
+Timing_engraver::start_translation_timestep ()
 {
-  Timing_translator::do_post_move_processing ();
+  Timing_translator::start_translation_timestep ();
 
   SCM nonauto = get_property ("barNonAuto");
-
+  Moment now = now_mom ();
   SCM which = get_property ("whichBar");
+
+  /*
+    Set the first bar of the score? 
+   */
   if (!gh_string_p (which))
-    which = now_mom ()
+    which
+      = (now.main_part_ || now.main_part_ == last_moment_.main_part_)
       ? SCM_EOL : ly_str02scm ("|");
+
+  Moment mp = measure_position ();
+  bool start_of_measure = (last_moment_.main_part_ != now.main_part_&& !mp.main_part_  );
+
+  if (start_of_measure)
+    {
+      Moment mlen = Moment(measure_length ());
+      unsmob_grob (get_property ("currentCommandColumn"))->set_grob_property ("measure-length", mlen.smobbed_copy()); 
+    }
   
   if (!gh_string_p (which) && !to_boolean (nonauto))
     {
       SCM always = get_property ("barAlways");
-      if (!measure_position ()
-         || (to_boolean (always)))
+
+      if ( start_of_measure || (to_boolean (always)))
        {
-         which=get_property ("defaultBarType" );
+         /* should this work, or be junked?  See input/bugs/no-bars.ly */
+         which = get_property ("defaultBarType");
        }
     }
 
@@ -54,11 +80,21 @@ Timing_engraver::do_post_move_processing( )
 }
 
 void
-Timing_engraver::do_pre_move_processing ()
+Timing_engraver::stop_translation_timestep ()
 {
-  Timing_translator::do_pre_move_processing ();
-  daddy_trans_l_->set_property ("whichBar", SCM_EOL);  
+  Timing_translator::stop_translation_timestep ();
+  daddy_trans_l_->set_property ("whichBar", SCM_EOL);
+  last_moment_ = now_mom ();
+      
 }
 
 
-
+ENTER_DESCRIPTION(Timing_engraver,
+/* descr */       " Responsible for synchronizing timing information from staves. 
+Normally in @code{Score}.  In order to create polyrhythmic music,
+this engraver should be removed from @code{Score} and placed in
+@code{Staff}.",
+/* creats*/       "",
+/* acks  */       "",
+/* reads */       "timeSignatureFraction barCheckNoSynchronize barNonAuto whichBar barAlways defaultBarType skipBars timing oneBeat measureLength measurePosition currentBarNumber",
+/* write */       "");