/*
- stem-engraver.cc -- implement Stem_engraver
+ This file is part of LilyPond, the GNU music typesetter.
- source file of the GNU LilyPond music typesetter
+ Copyright (C) 1997--2011 Han-Wen Nienhuys <hanwen@xs4all.nl>
- (c) 1997--2005 Han-Wen Nienhuys <hanwen@cs.uu.nl>
+ LilyPond is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
+
+ LilyPond is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with LilyPond. If not, see <http://www.gnu.org/licenses/>.
*/
+#include "engraver.hh"
+
#include "context.hh"
#include "directional-element-interface.hh"
-#include "engraver.hh"
+#include "duration.hh"
+#include "international.hh"
#include "item.hh"
#include "misc.hh"
#include "rhythmic-head.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
{
Grob *stem_;
Grob *tremolo_;
- Music *rhythmic_ev_;
- Music *tremolo_ev_;
+ Stream_event *rhythmic_ev_;
+ Stream_event *tremolo_ev_;
TRANSLATOR_DECLARATIONS (Stem_engraver);
protected:
void make_stem (Grob_info);
- virtual void acknowledge_grob (Grob_info);
- virtual void stop_translation_timestep ();
- virtual bool try_music (Music *);
+ DECLARE_TRANSLATOR_LISTENER (tremolo);
+ DECLARE_ACKNOWLEDGER (rhythmic_head);
+ void stop_translation_timestep ();
};
Stem_engraver::Stem_engraver ()
{
/* 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.music_cause ()->self_scm ());
-
- /*
- we take the duration log from the Event, since the duration-log
- for a note head is always <= 2.
- */
- Music *music = gi.music_cause ();
- Duration *dur = unsmob_duration (music->get_property ("duration"));
-
- stem_->set_property ("duration-log", dur ? scm_int2num (dur->duration_log ()) : 0);
+ stem_ = make_item ("Stem", gi.grob ()->self_scm ());
if (tremolo_ev_)
{
/* Stem tremolo is never applied to a note by default,
- is must me requested. But there is a default for the
+ it must be requested. But there is a default for the
tremolo value:
c4:8 c c:
- the first and last (quarter) note bothe get one tremolo flag. */
+ the first and last (quarter) note both get one tremolo flag. */
int requested_type
- = scm_to_int (tremolo_ev_->get_property ("tremolo-type"));
+ = robust_scm2int (tremolo_ev_->get_property ("tremolo-type"), 0);
SCM f = get_property ("tremoloFlags");
if (!requested_type)
{
requested_type = 8;
}
else
- context ()->set_property ("tremoloFlags", scm_int2num (requested_type));
+ context ()->set_property ("tremoloFlags", scm_from_int (requested_type));
+
+ /*
+ 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)
/* 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_int2num (tremolo_flags));
+ tremolo_->set_property ("flag-count", scm_from_int (tremolo_flags));
tremolo_->set_parent (stem_, X_AXIS);
- stem_->set_property ("tremolo-flag", tremolo_->self_scm ());
- tremolo_->set_property ("stem", stem_->self_scm ());
+ stem_->set_object ("tremolo-flag", tremolo_->self_scm ());
+ tremolo_->set_object ("stem", stem_->self_scm ());
}
}
}
void
-Stem_engraver::acknowledge_grob (Grob_info gi)
+Stem_engraver::acknowledge_rhythmic_head (Grob_info gi)
{
- if (Rhythmic_head::has_interface (gi.grob ()))
- {
- if (Rhythmic_head::get_stem (gi.grob ()))
- return;
-
- Music *cause = gi.music_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 ())
- {
- // FIXME:
- gi.music_cause ()->origin ()->warning (_f ("adding note head to incompatible stem (type = %d)",
- 1 << Stem::duration_log (stem_)));
- gi.music_cause ()->origin ()->warning (_f ("maybe input should specify polyphonic voices"));
- }
+ 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);
+
+ int ds = Stem::duration_log (stem_);
- Stem::add_head (stem_, gi.grob ());
+ if (ds != d->duration_log ())
+ {
+ gi.event_cause ()->origin ()->warning (_f ("adding note head to incompatible stem (type = %d/%d)",
+ ds < 0 ? 1 << -ds : 1,
+ ds > 0 ? 1 << ds : 1));
+ gi.event_cause ()->origin ()->warning (_ ("maybe input should specify polyphonic voices"));
}
+
+ Stem::add_head (stem_, gi.grob ());
}
void
tremolo_ev_ = 0;
}
-bool
-Stem_engraver::try_music (Music *m)
+IMPLEMENT_TRANSLATOR_LISTENER (Stem_engraver, tremolo);
+void
+Stem_engraver::listen_tremolo (Stream_event *ev)
{
- if (m->is_mus_type ("tremolo-event"))
- {
- tremolo_ev_ = m;
- return true;
- }
- return false;
+ ASSIGN_EVENT_ONCE (tremolo_ev_, ev);
}
+ADD_ACKNOWLEDGER (Stem_engraver, rhythmic_head);
+
ADD_TRANSLATOR (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 */ "");
+ /* 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 */
+ ""
+ );