/*
- chord-tremolo-engraver.cc -- implement Chord_tremolo_engraver
+ This file is part of LilyPond, the GNU music typesetter.
- source file of the GNU LilyPond music typesetter
+ Copyright (C) 2000--2015 Han-Wen Nienhuys <hanwen@xs4all.nl>
+ Erik Sandberg <mandolaerik@gmail.com>
- (c) 2000--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 "beam.hh"
+#include "engraver-group.hh"
+#include "international.hh"
+#include "item.hh"
+#include "math.h" // ceil
+#include "misc.hh"
#include "repeated-music.hh"
-#include "stem.hh"
#include "rhythmic-head.hh"
-#include "engraver-group-engraver.hh"
-#include "warn.hh"
-#include "misc.hh"
-#include "note-head.hh"
#include "spanner.hh"
-#include "item.hh"
-#include "chord-tremolo-iterator.hh"
#include "stem-tremolo.hh"
-#include "math.h" // ceil
+#include "stem.hh"
+#include "stream-event.hh"
+#include "warn.hh"
+
+#include "translator.icc"
/**
*/
class Chord_tremolo_engraver : public Engraver
{
- void typeset_beam ();
TRANSLATOR_DECLARATIONS (Chord_tremolo_engraver);
protected:
- Music *repeat_;
-
- /// moment (global time) where beam started.
- Moment start_mom_;
- Moment stop_mom_;
- int flags_;
- int total_duration_flags_;
+ Stream_event *repeat_;
- /// location within measure where beam started.
- Moment beam_start_location_;
-
- bool body_is_sequential_;
Spanner *beam_;
- Spanner *finished_beam_;
- Item *stem_tremolo_;
+ // Store the pointer to the previous stem, so we can create a beam if
+ // necessary and end the spanner
+ Grob *previous_stem_;
+
protected:
virtual void finalize ();
- virtual bool try_music (Music *);
- virtual void acknowledge_grob (Grob_info);
- virtual void stop_translation_timestep ();
- virtual void start_translation_timestep ();
- virtual void process_music ();
+ void process_music ();
+ void listen_tremolo_span (Stream_event *);
+ void acknowledge_stem (Grob_info);
};
-Chord_tremolo_engraver::Chord_tremolo_engraver ()
+Chord_tremolo_engraver::Chord_tremolo_engraver (Context *c)
+ : Engraver (c)
{
- beam_ = finished_beam_ = 0;
+ beam_ = 0;
repeat_ = 0;
- flags_ = 0;
- stem_tremolo_ = 0;
- body_is_sequential_ = false;
+ previous_stem_ = 0;
}
-bool
-Chord_tremolo_engraver::try_music (Music *m)
+void
+Chord_tremolo_engraver::listen_tremolo_span (Stream_event *ev)
{
- if (m->is_mus_type ("repeated-music")
- && m->get_property ("iterator-ctor") == Chord_tremolo_iterator::constructor_proc
- && !repeat_)
+ Direction span_dir = to_dir (ev->get_property ("span-direction"));
+ if (span_dir == START)
{
- Moment l = m->get_length ();
- repeat_ = m;
- start_mom_ = now_mom ();
- stop_mom_ = start_mom_ + l;
-
- Music *body = Repeated_music::body (m);
- body_is_sequential_ = body->is_mus_type ("sequential-music");
-
- int elt_count = body_is_sequential_ ? scm_ilength (body->get_property ("elements")) : 1;
-
- if (body_is_sequential_ && elt_count != 2)
- {
- m->origin ()->warning (_f ("Chord tremolo with %d elements. Must have two elements.", elt_count));
- }
-
- if (elt_count <= 0)
- elt_count = 1;
-
- Rational total_dur = l.main_part_;
- Rational note_dur = total_dur / Rational (elt_count * Repeated_music::repeat_count (repeat_));
-
- total_duration_flags_ = 0 >? (intlog2 (total_dur.den ()) - 2);
-
- flags_ = intlog2 (note_dur.den ()) -2;
-
- return true;
+ ASSIGN_EVENT_ONCE (repeat_, ev);
+ }
+ else if (span_dir == STOP)
+ {
+ if (!repeat_)
+ ev->origin ()->warning (_ ("No tremolo to end"));
+ repeat_ = 0;
+ beam_ = 0;
+ previous_stem_ = 0;
}
-
- return false;
}
void
Chord_tremolo_engraver::process_music ()
{
- if (repeat_ && body_is_sequential_ && !beam_)
+ if (repeat_ && !beam_)
{
beam_ = make_spanner ("Beam", repeat_->self_scm ());
- beam_->set_property ("chord-tremolo", SCM_BOOL_T);
-
- beam_start_location_ = robust_scm2moment (get_property ("measurePosition"), Moment (0));
}
}
void
Chord_tremolo_engraver::finalize ()
{
- typeset_beam ();
if (beam_)
{
repeat_->origin ()->warning (_ ("unterminated chord tremolo"));
+ announce_end_grob (beam_, SCM_EOL);
beam_->suicide ();
}
}
void
-Chord_tremolo_engraver::typeset_beam ()
-{
- finished_beam_ = 0;
-}
-
-void
-Chord_tremolo_engraver::acknowledge_grob (Grob_info info)
+Chord_tremolo_engraver::acknowledge_stem (Grob_info info)
{
- if (beam_ && Stem::has_interface (info.grob_))
+ if (beam_)
{
- Grob *s = info.grob_;
-
- if (start_mom_ == now_mom ())
- Stem::set_beaming (s, flags_, RIGHT);
- else
- Stem::set_beaming (s, flags_, LEFT);
+ int tremolo_type = robust_scm2int (repeat_->get_property ("tremolo-type"), 1);
+ int flags = max (0, intlog2 (tremolo_type) - 2);
+ int repeat_count = robust_scm2int (repeat_->get_property ("repeat-count"), 1);
+ int gap_count = min (flags, intlog2 (repeat_count) + 1);
+
+ Grob *s = info.grob ();
+ if (previous_stem_)
+ {
+ // FIXME: We know that the beam has ended only in listen_tremolo_span
+ // but then it is too late for Spanner_break_forbid_engraver
+ // to allow a line break... So, as a nasty hack, announce the
+ // spanner's end after each note except the first. The only
+ // "drawback" is that for multi-note tremolos a break would
+ // theoretically be allowed after the second note (but since
+ // that note is typically not at a barline, I don't think
+ // anyone will ever notice!)
+ announce_end_grob (beam_, previous_stem_->self_scm ());
+ // Create the whole beam between previous and current note
+ Stem::set_beaming (previous_stem_, flags, RIGHT);
+ Stem::set_beaming (s, flags, LEFT);
+ }
if (Stem::duration_log (s) != 1)
- {
- beam_->set_property ("gap-count", scm_int2num (flags_ - total_duration_flags_));
- }
-
- if (info.music_cause ()->is_mus_type ("rhythmic-event"))
- {
- Beam::add_stem (beam_, s);
- }
+ beam_->set_property ("gap-count", scm_from_int (gap_count));
+
+ if (info.ultimate_event_cause ()->in_event_class ("rhythmic-event"))
+ Beam::add_stem (beam_, s);
else
- {
- String s = _ ("stem must have Rhythmic structure");
- if (info.music_cause ())
- info.music_cause ()->origin ()->warning (s);
- else
- ::warning (s);
- }
- }
- else if (repeat_
- && flags_ && !body_is_sequential_ && Stem::has_interface (info.grob_))
- {
- stem_tremolo_ = make_item ("StemTremolo", repeat_->self_scm ());
- stem_tremolo_->set_property ("flag-count",
- scm_int2num (flags_));
- stem_tremolo_->set_property ("stem",
- info.grob_->self_scm ());
- stem_tremolo_->set_parent (info.grob_, X_AXIS);
+ {
+ string s = _ ("stem must have Rhythmic structure");
+ if (info.event_cause ())
+ info.event_cause ()->origin ()->warning (s);
+ else
+ ::warning (s);
+ }
+ // Store current grob, so we can possibly end the spanner here (and
+ // reset the beam direction to RIGHT)
+ previous_stem_ = s;
}
}
void
-Chord_tremolo_engraver::start_translation_timestep ()
+Chord_tremolo_engraver::boot ()
{
- if (beam_ && stop_mom_ == now_mom ())
- {
- finished_beam_ = beam_;
- repeat_ = 0;
- beam_ = 0;
- }
+ ADD_LISTENER (Chord_tremolo_engraver, tremolo_span);
+ ADD_ACKNOWLEDGER (Chord_tremolo_engraver, stem);
}
-void
-Chord_tremolo_engraver::stop_translation_timestep ()
-{
- if (stem_tremolo_)
- {
- repeat_ = 0;
- if (beam_)
- programming_error ("Huh, beam and stem tremolo?");
- stem_tremolo_ = 0;
- }
+ADD_TRANSLATOR (Chord_tremolo_engraver,
+ /* doc */
+ "Generate beams for tremolo repeats.",
- typeset_beam ();
-}
+ /* create */
+ "Beam ",
-ADD_TRANSLATOR (Chord_tremolo_engraver,
- /* descr */ "Generates beams for tremolo repeats.",
- /* creats*/ "Beam",
- /* accepts */ "repeated-music",
- /* acks */ "stem-interface note-head-interface",
- /* reads */ "",
- /* write */ "");
+ /* read */
+ "",
+
+ /* write */
+ ""
+ );
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