/*
- stem-grav.cc -- implement Stem_engraver
+ stem-engraver.cc -- implement Stem_engraver
source file of the GNU LilyPond music typesetter
- (c) 1997--2002 Han-Wen Nienhuys <hanwen@cs.uu.nl>
+ (c) 1997--2008 Han-Wen Nienhuys <hanwen@xs4all.nl>
*/
-#include "staff-symbol-referencer.hh"
-#include "rhythmic-head.hh"
-#include "stem.hh"
-#include "event.hh"
-#include "misc.hh"
-#include "stem-tremolo.hh"
-#include "item.hh"
-#include "translator-group.hh"
#include "engraver.hh"
+#include "context.hh"
+#include "directional-element-interface.hh"
+#include "duration.hh"
+#include "international.hh"
+#include "item.hh"
+#include "misc.hh"
+#include "rhythmic-head.hh"
+#include "script-interface.hh"
+#include "staff-symbol-referencer.hh"
+#include "stem-tremolo.hh"
+#include "stem.hh"
+#include "stream-event.hh"
+#include "translator.icc"
-/**
- Make stems upon receiving noteheads.
- */
class Stem_engraver : public Engraver
{
- TRANSLATOR_DECLARATIONS(Stem_engraver);
-protected:
- virtual void acknowledge_grob (Grob_info);
- virtual void stop_translation_timestep ();
- virtual bool try_music (Music*);
-
-private:
- Grob *stem_;
+ Grob *stem_;
Grob *tremolo_;
- Music *rhythmic_req_;
- Music* tremolo_req_;
+ Stream_event *rhythmic_ev_;
+ Stream_event *tremolo_ev_;
+
+ TRANSLATOR_DECLARATIONS (Stem_engraver);
+
+protected:
+ void make_stem (Grob_info);
+
+ DECLARE_TRANSLATOR_LISTENER (tremolo);
+ DECLARE_ACKNOWLEDGER (rhythmic_head);
+ void stop_translation_timestep ();
};
Stem_engraver::Stem_engraver ()
{
- tremolo_req_ = 0;
+ tremolo_ev_ = 0;
stem_ = 0;
tremolo_ = 0;
- rhythmic_req_ =0;
+ rhythmic_ev_ = 0;
}
-
void
-Stem_engraver::acknowledge_grob (Grob_info i)
+Stem_engraver::make_stem (Grob_info gi)
{
- Grob* h = i.grob_;
- if (Rhythmic_head::has_interface (h))
+ /* Announce the cause of the head as cause of the stem. The
+ stem needs a rhythmic structure to fit it into a beam. */
+ stem_ = make_item ("Stem", gi.grob ()->self_scm ());
+
+ if (tremolo_ev_)
{
- if (Rhythmic_head::get_stem (h))
- return;
+ /* Stem tremolo is never applied to a note by default,
+ is must me requested. But there is a default for the
+ tremolo value:
- /* Reverted to the old method so chord tremolos work again. /MB
- */
- int duration_log = 0;
+ c4:8 c c:
- Music * m = i.music_cause ();
- if (m->is_mus_type ("rhythmic-event"))
- duration_log = unsmob_duration (m->get_mus_property ("duration"))-> duration_log ();
-
- if (!stem_)
+ the first and last (quarter) note bothe get one tremolo flag. */
+ int requested_type
+ = scm_to_int (tremolo_ev_->get_property ("tremolo-type"));
+ SCM f = get_property ("tremoloFlags");
+ if (!requested_type)
{
- stem_ = new Item (get_property ("Stem"));
-
- stem_->set_grob_property ("duration-log", gh_int2scm (duration_log));
-
- if (tremolo_req_)
- {
- /*
- Stem tremolo is never applied to a note by default,
- is must me evented. But there is a default for the
- tremolo value:
-
- c4:8 c c:
-
- the first and last (quarter) note bothe get one tremolo flag.
- */
- int evented_type = gh_scm2int (tremolo_req_->get_mus_property ("tremolo-type"));
- SCM f = get_property ("tremoloFlags");
- if (!evented_type && gh_number_p (f))
- evented_type = gh_scm2int (f);
- else
- daddy_trans_->set_property ("tremoloFlags", gh_int2scm (evented_type));
-
- int tremolo_flags = intlog2 (evented_type) - 2
- - (duration_log > 2 ? duration_log - 2 : 0);
- if (tremolo_flags <= 0)
- {
- tremolo_req_->origin()->warning (_("tremolo duration is too long"));
- tremolo_flags = 0;
- }
-
- if (tremolo_flags)
- {
- tremolo_ = new Item (get_property ("StemTremolo"));
- announce_grob(tremolo_, tremolo_req_->self_scm());
-
- /*
- The number of tremolo flags is the number of flags of
- the tremolo-type minus the number of flags of the note
- itself.
- */
- tremolo_->set_grob_property ("flag-count",
- gh_int2scm (tremolo_flags));
- tremolo_->set_parent (stem_, X_AXIS);
- }
- }
-
- /*
- We announce the cause of the head as cause of the stem.
- The stem needs a rhythmic structure to fit it into a beam. */
- announce_grob(stem_, i.music_cause ()->self_scm());
+ if (scm_is_number (f))
+ requested_type = scm_to_int (f);
+ else
+ requested_type = 8;
}
+ else
+ context ()->set_property ("tremoloFlags", scm_from_int (requested_type));
- if (Stem::duration_log (stem_) != duration_log)
+
+ /*
+ we take the duration log from the Event, since the duration-log
+ for a note head is always <= 2.
+ */
+ Stream_event *ev = gi.event_cause ();
+ Duration *dur = unsmob_duration (ev->get_property ("duration"));
+
+ int tremolo_flags = intlog2 (requested_type) - 2
+ - (dur->duration_log () > 2 ? dur->duration_log () - 2 : 0);
+ if (tremolo_flags <= 0)
{
- i.music_cause ()->origin ()->warning (_f ("Adding note head to incompatible stem (type = %d)", 1 << Stem::duration_log (stem_)));
+ tremolo_ev_->origin ()->warning (_ ("tremolo duration is too long"));
+ tremolo_flags = 0;
}
- Stem::add_head (stem_,h);
+ if (tremolo_flags)
+ {
+ tremolo_ = make_item ("StemTremolo", tremolo_ev_->self_scm ());
+
+ /* The number of tremolo flags is the number of flags of the
+ tremolo-type minus the number of flags of the note itself. */
+ tremolo_->set_property ("flag-count", scm_from_int (tremolo_flags));
+ tremolo_->set_parent (stem_, X_AXIS);
+ stem_->set_object ("tremolo-flag", tremolo_->self_scm ());
+ tremolo_->set_object ("stem", stem_->self_scm ());
+ }
}
}
void
-Stem_engraver::stop_translation_timestep ()
+Stem_engraver::acknowledge_rhythmic_head (Grob_info gi)
{
- if (tremolo_)
+ if (Rhythmic_head::get_stem (gi.grob ()))
+ return;
+
+ Stream_event *cause = gi.event_cause ();
+ if (!cause)
+ return;
+ Duration *d = unsmob_duration (cause->get_property ("duration"));
+ if (!d)
+ return;
+
+ if (!stem_)
+ make_stem (gi);
+
+ if (Stem::duration_log (stem_) != d->duration_log ())
{
- Stem_tremolo::set_stem (tremolo_, stem_);
- typeset_grob (tremolo_);
- tremolo_ = 0;
+ // FIXME:
+ gi.event_cause ()->origin ()->warning (_f ("adding note head to incompatible stem (type = %d)",
+ 1 << Stem::duration_log (stem_)));
+ gi.event_cause ()->origin ()->warning (_ ("maybe input should specify polyphonic voices"));
}
+ Stem::add_head (stem_, gi.grob ());
+}
+
+void
+Stem_engraver::stop_translation_timestep ()
+{
+ tremolo_ = 0;
if (stem_)
{
+ /* FIXME: junk these properties. */
SCM prop = get_property ("stemLeftBeamCount");
- if (gh_number_p (prop))
+ if (scm_is_number (prop))
{
- Stem::set_beaming (stem_,gh_scm2int (prop),LEFT);
- daddy_trans_->unset_property (ly_symbol2scm ("stemLeftBeamCount"));
+ Stem::set_beaming (stem_, scm_to_int (prop), LEFT);
+ context ()->unset_property (ly_symbol2scm ("stemLeftBeamCount"));
}
prop = get_property ("stemRightBeamCount");
- if (gh_number_p (prop))
+ if (scm_is_number (prop))
{
- Stem::set_beaming (stem_,gh_scm2int (prop), RIGHT);
- daddy_trans_->unset_property (ly_symbol2scm ("stemRightBeamCount"));
+ Stem::set_beaming (stem_, scm_to_int (prop), RIGHT);
+ context ()->unset_property (ly_symbol2scm ("stemRightBeamCount"));
}
-
- typeset_grob (stem_);
stem_ = 0;
}
-
-
- tremolo_req_ = 0;
+ tremolo_ev_ = 0;
}
-bool
-Stem_engraver::try_music (Music* r)
+IMPLEMENT_TRANSLATOR_LISTENER (Stem_engraver, tremolo);
+void
+Stem_engraver::listen_tremolo (Stream_event *ev)
{
- if (r->is_mus_type ("tremolo-event"))
- {
- tremolo_req_ = r;
- return true;
- }
- return false;
+ ASSIGN_EVENT_ONCE (tremolo_ev_, ev);
}
-ENTER_DESCRIPTION(Stem_engraver,
-/* descr */ "Create stems and single-stem tremolos. It also works together with
-the beam engraver for overriding beaming.",
-/* creats*/ "Stem StemTremolo",
-/* accepts */ "tremolo-event",
-/* acks */ "rhythmic-head-interface",
-/* reads */ "tremoloFlags stemLeftBeamCount stemRightBeamCount",
-/* write */ "");
+ADD_ACKNOWLEDGER (Stem_engraver, rhythmic_head);
+
+ADD_TRANSLATOR (Stem_engraver,
+ /* doc */
+ "Create stems and single-stem tremolos. It also works"
+ " together with the beam engraver for overriding beaming.",
+
+ /* create */
+ "Stem "
+ "StemTremolo ",
+
+ /* read */
+ "tremoloFlags "
+ "stemLeftBeamCount "
+ "stemRightBeamCount ",
+
+ /* write */
+ ""
+ );
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