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/*
This file is part of LilyPond, the GNU music typesetter.
Copyright (C) 1997--2015 Han-Wen Nienhuys <hanwen@xs4all.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 "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"
class Stem_engraver : public Engraver
{
Grob *stem_;
Grob *tremolo_;
vector <Grob *> maybe_flags_;
Stream_event *rhythmic_ev_;
Stream_event *tremolo_ev_;
bool tuplet_start_;
TRANSLATOR_DECLARATIONS (Stem_engraver);
protected:
void make_stem (Grob_info, bool);
void listen_tremolo (Stream_event *);
void listen_tuplet_span (Stream_event *);
void acknowledge_rhythmic_head (Grob_info);
void stop_translation_timestep ();
void finalize ();
void kill_unused_flags ();
};
Stem_engraver::Stem_engraver ()
{
tremolo_ev_ = 0;
stem_ = 0;
tremolo_ = 0;
rhythmic_ev_ = 0;
tuplet_start_ = false;
}
void
Stem_engraver::make_stem (Grob_info gi, bool tuplet_start)
{
/* 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 (tuplet_start)
stem_->set_property ("tuplet-start", SCM_BOOL_T);
(void) make_item ("StemStub", gi.grob ()->self_scm ());
if (tremolo_ev_)
{
/* Stem tremolo is never applied to a note by default,
it must be requested. But there is a default for the
tremolo value:
c4:8 c c:
the first and last (quarter) note both get one tremolo flag. */
int requested_type
= robust_scm2int (tremolo_ev_->get_property ("tremolo-type"), 8);
/*
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)
{
tremolo_ev_->origin ()->warning (_ ("tremolo duration is too long"));
tremolo_flags = 0;
}
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::acknowledge_rhythmic_head (Grob_info gi)
{
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, tuplet_start_);
int ds = Stem::duration_log (stem_);
int dc = d->duration_log ();
// half notes and quarter notes all have compatible stems.
// Longas are done differently (oops?), so we can't unify
// them with the other stemmed notes.
if (ds == 1)
ds = 2;
if (dc == 1)
dc = 2;
// whole notes and brevis both have no stems
if (ds == -1)
ds = 0;
if (dc == -1)
dc = 0;
if (ds != dc)
{
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 ());
if (Stem::is_normal_stem (stem_)
&& Stem::duration_log (stem_) > 2
&& !(unsmob<Grob> (stem_->get_object ("flag"))))
{
Item *flag = make_item ("Flag", stem_->self_scm ());
flag->set_parent (stem_, X_AXIS);
stem_->set_object ("flag", flag->self_scm ());
maybe_flags_.push_back (flag);
}
if (tuplet_start_)
stem_->set_property ("tuplet-start", SCM_BOOL_T);
}
void
Stem_engraver::kill_unused_flags ()
{
for (vsize i = 0; i < maybe_flags_.size (); i++)
if (unsmob<Grob> (maybe_flags_[i]->get_parent (X_AXIS)->get_object ("beam")))
maybe_flags_[i]->suicide ();
}
void
Stem_engraver::finalize ()
{
kill_unused_flags ();
}
void
Stem_engraver::stop_translation_timestep ()
{
if (scm_is_string (get_property ("whichBar")))
kill_unused_flags ();
tremolo_ = 0;
if (stem_)
{
/* FIXME: junk these properties. */
SCM prop = get_property ("stemLeftBeamCount");
if (scm_is_number (prop))
{
Stem::set_beaming (stem_, scm_to_int (prop), LEFT);
context ()->unset_property (ly_symbol2scm ("stemLeftBeamCount"));
}
prop = get_property ("stemRightBeamCount");
if (scm_is_number (prop))
{
Stem::set_beaming (stem_, scm_to_int (prop), RIGHT);
context ()->unset_property (ly_symbol2scm ("stemRightBeamCount"));
}
stem_ = 0;
}
tuplet_start_ = false;
tremolo_ev_ = 0;
}
void
Stem_engraver::listen_tuplet_span (Stream_event *ev)
{
Direction dir = to_dir (ev->get_property ("span-direction"));
if (dir == START)
{
// set stem property if stem already exists
if (stem_)
stem_->set_property ("tuplet-start", SCM_BOOL_T);
tuplet_start_ = true; // stash the value for use in later creation
}
}
void
Stem_engraver::listen_tremolo (Stream_event *ev)
{
ASSIGN_EVENT_ONCE (tremolo_ev_, ev);
}
void
Stem_engraver::boot ()
{
ADD_LISTENER (Stem_engraver, tuplet_span);
ADD_LISTENER (Stem_engraver, tremolo);
ADD_ACKNOWLEDGER (Stem_engraver, rhythmic_head);
}
ADD_TRANSLATOR (Stem_engraver,
/* doc */
"Create stems, flags and single-stem tremolos. It also works"
" together with the beam engraver for overriding beaming.",
/* create */
"Flag "
"Stem "
"StemStub "
"StemTremolo ",
/* read */
"stemLeftBeamCount "
"stemRightBeamCount "
"whichBar ",
/* write */
""
);
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