/*
- 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--2000 Han-Wen Nienhuys <hanwen@cs.uu.nl>
+ (c) 1997--2004 Han-Wen Nienhuys <hanwen@cs.uu.nl>
*/
#include "time-signature.hh"
-#include "command-request.hh"
-#include "engraver.hh"
-
-
+#include "warn.hh"
#include "engraver-group-engraver.hh"
-
+#include "misc.hh"
/**
generate time_signatures.
*/
-class Time_signature_engraver : public Engraver {
+class Time_signature_engraver : public Engraver
+{
+ Item *time_signature_;
+ SCM last_time_fraction_;
+
protected:
- virtual void stop_translation_timestep();
- virtual void create_grobs ();
+ virtual void stop_translation_timestep ();
+ virtual void process_music ();
public:
- VIRTUAL_COPY_CONS(Translator);
- Item * time_signature_p_;
- SCM last_time_fraction_;
- Time_signature_engraver();
+ TRANSLATOR_DECLARATIONS (Time_signature_engraver);
};
-Time_signature_engraver::Time_signature_engraver()
+Time_signature_engraver::Time_signature_engraver ()
{
- time_signature_p_ =0;
- last_time_fraction_ = SCM_EOL;
+ 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 (last_time_fraction_ != fr)
+ SCM fr = get_property ("timeSignatureFraction");
+ if (!time_signature_
+ && last_time_fraction_ != fr
+ && scm_is_pair (fr))
{
+ int den = scm_to_int (scm_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,
+ scm_to_int (scm_car (fr))
+ ));
+ }
+
+
last_time_fraction_ = fr;
- time_signature_p_ = new Item (get_property ("TimeSignature"));
- time_signature_p_->set_grob_property ("fraction",fr);
-
- if (time_signature_p_)
- announce_grob (time_signature_p_, 0);
+ time_signature_ = make_item ("TimeSignature",SCM_EOL);
+ time_signature_->set_property ("fraction",fr);
}
-
}
-
-
void
-Time_signature_engraver::stop_translation_timestep()
+Time_signature_engraver::stop_translation_timestep ()
{
- if (time_signature_p_)
- {
- typeset_grob (time_signature_p_);
- time_signature_p_ =0;
- }
+ time_signature_ = 0;
}
-
-
-ADD_THIS_TRANSLATOR(Time_signature_engraver);
+ADD_TRANSLATOR (Time_signature_engraver,
+/* descr */ "Create a TimeSignature whenever @code{timeSignatureFraction} changes",
+/* creats*/ "TimeSignature",
+/* accepts */ "",
+/* acks */ "",
+/* reads */ "",
+/* write */ "");