/*
- time_signature-reg.cc -- implement Time_signature_engraver
+ time-signature-engraver.cc -- implement Time_signature_engraver
source file of the GNU LilyPond music typesetter
- (c) 1997--2002 Han-Wen Nienhuys <hanwen@cs.uu.nl>
+ (c) 1997--2003 Han-Wen Nienhuys <hanwen@cs.uu.nl>
*/
#include "time-signature.hh"
-#include "command-request.hh"
-#include "engraver.hh"
-
+#include "warn.hh"
+#include "engraver.hh"
#include "engraver-group-engraver.hh"
-
+#include "misc.hh"
/**
generate time_signatures.
*/
class Time_signature_engraver : public Engraver
{
- Item * time_signature_p_;
+ Item * time_signature_;
SCM last_time_fraction_;
protected:
virtual void stop_translation_timestep ();
- virtual void create_grobs ();
+ virtual void process_music ();
public:
TRANSLATOR_DECLARATIONS(Time_signature_engraver);
-
};
Time_signature_engraver::Time_signature_engraver ()
{
- time_signature_p_ =0;
+ time_signature_ =0;
last_time_fraction_ = SCM_BOOL_F;
}
void
-Time_signature_engraver::create_grobs ()
+Time_signature_engraver::process_music ()
{
/*
not rigorously safe, since the value might get GC'd and
reallocated in the same spot */
SCM fr= get_property ("timeSignatureFraction");
- if (!time_signature_p_ && last_time_fraction_ != fr)
+ if (!time_signature_
+ && last_time_fraction_ != fr
+ && gh_pair_p (fr))
{
+ int den = gh_scm2int (gh_cdr (fr));
+ if (den != (1 << intlog2 (den)))
+ {
+ /*
+ Todo: should make typecheck?
+
+ OTOH, Tristan Keuris writes 8/20 in his Intermezzi.
+ */
+ warning (_f("Found strange time signature %d/%d.",
+ den,
+ gh_scm2int (gh_car (fr))
+ ));
+ }
+
+
last_time_fraction_ = fr;
- time_signature_p_ = new Item (get_property ("TimeSignature"));
- time_signature_p_->set_grob_property ("fraction",fr);
+ time_signature_ = new Item (get_property ("TimeSignature"));
+ time_signature_->set_grob_property ("fraction",fr);
- if (time_signature_p_)
- announce_grob (time_signature_p_, 0);
+ if (time_signature_)
+ announce_grob(time_signature_, SCM_EOL);
}
-
}
-
-
void
Time_signature_engraver::stop_translation_timestep ()
{
- if (time_signature_p_)
+ if (time_signature_)
{
- typeset_grob (time_signature_p_);
- time_signature_p_ =0;
+ typeset_grob (time_signature_);
+ time_signature_ =0;
}
}
-
-
-
ENTER_DESCRIPTION(Time_signature_engraver,
/* descr */ "Create a TimeSignature whenever @code{timeSignatureFraction} changes",
/* creats*/ "TimeSignature",
-/* acks */ "",
+/* accepts */ "",
+/* acks */ "",
/* reads */ "",
/* write */ "");