source file of the GNU LilyPond music typesetter
- (c) 1997--1998 Han-Wen Nienhuys <hanwen@cs.uu.nl>
+ (c) 1997--2004 Han-Wen Nienhuys <hanwen@cs.uu.nl>
*/
-#include "stem-engraver.hh"
-#include "note-head.hh"
-#include "stem.hh"
-#include "musical-request.hh"
-#include "duration-convert.hh"
+#include "context.hh"
+#include "directional-element-interface.hh"
+#include "engraver.hh"
+#include "item.hh"
#include "misc.hh"
-#include "abbrev.hh"
+#include "rhythmic-head.hh"
+#include "script-interface.hh"
+#include "staff-symbol-referencer.hh"
+#include "stem-tremolo.hh"
+#include "stem.hh"
-Stem_engraver::Stem_engraver()
+/**
+ Make stems upon receiving noteheads.
+ */
+class Stem_engraver : public Engraver
{
- abbrev_req_l_ = 0;
- stem_p_ = 0;
- abbrev_p_ = 0;
- default_abbrev_i_ = 16;
- dir_ = CENTER;
+ Grob *stem_;
+ Grob *tremolo_;
+ Music *rhythmic_ev_;
+ Music *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 *);
+};
+
+Stem_engraver::Stem_engraver ()
+{
+ tremolo_ev_ = 0;
+ stem_ = 0;
+ tremolo_ = 0;
+ rhythmic_ev_ =0;
}
void
-Stem_engraver::do_creation_processing ()
+Stem_engraver::make_stem (Grob_info gi)
{
- Scalar prop = get_property ("abbrev");
- if (prop.isnum_b ())
+ /* 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 ());
+
+ /*
+ docme: why do we take duration-log from request, not from note
+ head?
+ */
+ int duration_log = gi.music_cause ()->duration_log ();
+ stem_->set_property ("duration-log", scm_int2num (duration_log));
+
+ if (tremolo_ev_)
{
- default_abbrev_i_ = prop;
+ /* Stem tremolo is never applied to a note by default,
+ is must me 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. */
+ int requested_type
+ = scm_to_int (tremolo_ev_->get_property ("tremolo-type"));
+ SCM f = get_property ("tremoloFlags");
+ if (!requested_type)
+ {
+ if (scm_is_number (f))
+ requested_type = scm_to_int (f);
+ else
+ requested_type = 8;
+ }
+ else
+ context ()->set_property ("tremoloFlags", scm_int2num (requested_type));
+
+ int tremolo_flags = intlog2 (requested_type) - 2
+ - (duration_log > 2 ? 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_int2num (tremolo_flags));
+ tremolo_->set_parent (stem_, X_AXIS);
+ stem_->set_property ("tremolo-flag", tremolo_->self_scm ());
+ tremolo_->set_property ("stem", stem_->self_scm ());
+ }
}
}
void
-Stem_engraver::acknowledge_element(Score_element_info i)
+Stem_engraver::acknowledge_grob (Grob_info gi)
{
- if (i.elem_l_->is_type_b (Rhythmic_head::static_name()))
+ if (Rhythmic_head::has_interface (gi.grob_))
{
- Rhythmic_head *h = (Rhythmic_head*) dynamic_cast <Item *> (i.elem_l_);
- if (!stem_p_)
- {
- Rhythmic_req * r = dynamic_cast <Rhythmic_req *> (i.req_l_);
- stem_p_ = new Stem;
- int durlog_i = r->duration_.durlog_i_;
- stem_p_->flag_i_ = durlog_i;
+ if (Rhythmic_head::get_stem (gi.grob_))
+ return;
+ Music * cause = gi.music_cause ();
+ if (!cause)
+ return ;
+
+ if (!stem_)
+ make_stem (gi);
+
+ int duration_log = cause->duration_log ();
+ if (Stem::duration_log (stem_) != duration_log)
+ {
+ // FIXME:
+ gi.music_cause ()->origin ()->warning (_f ("Adding note head to incompatible stem (type = %d)", 1 << Stem::duration_log (stem_)));
- if (abbrev_req_l_)
- {
- /*
- suggests typing of:
- c8:16 c: c: c:
- hmm, which isn't so bad?
- */
- int t = abbrev_req_l_->type_i_;
- if (!t)
- t = default_abbrev_i_;
- else
- default_abbrev_i_ = t;
-
- if (t)
- {
- abbrev_p_ = new Abbreviation;
- announce_element (Score_element_info (abbrev_p_, abbrev_req_l_));
- abbrev_p_->abbrev_flags_i_ =intlog2 (t) - (durlog_i>? 2);
- }
- }
-
- // must give the request, to preserve the rhythmic info.
- announce_element (Score_element_info (stem_p_, r));
+ gi.music_cause ()->origin ()->warning (_f ("Don't you want polyphonic voices instead?"));
}
- stem_p_->add_head (h);
+
+ Stem::add_head (stem_, gi.grob_);
}
}
void
-Stem_engraver::do_pre_move_processing()
+Stem_engraver::stop_translation_timestep ()
{
- if (abbrev_p_)
- {
- abbrev_p_->set_stem (stem_p_);
- typeset_element (abbrev_p_);
- abbrev_p_ = 0;
- }
- if (stem_p_)
+ tremolo_ = 0;
+ if (stem_)
{
- Scalar prop = get_property ("ydirection");
- dir_ = prop.isnum_b () ? (Direction)int(prop) : CENTER;
- if (dir_)
+ /* FIXME: junk these properties. */
+ SCM prop = get_property ("stemLeftBeamCount");
+ if (scm_is_number (prop))
{
- stem_p_->dir_ = dir_;
- stem_p_->dir_forced_b_ = true;
+ Stem::set_beaming (stem_,scm_to_int (prop),LEFT);
+ context ()->unset_property (ly_symbol2scm ("stemLeftBeamCount"));
}
-
- typeset_element(stem_p_);
- stem_p_ = 0;
+ 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;
}
- abbrev_req_l_ = 0;
+ tremolo_ev_ = 0;
}
bool
-Stem_engraver::do_try_request (Request* r)
+Stem_engraver::try_music (Music *m)
{
- Musical_req* mus_l = dynamic_cast <Musical_req *> (r);
- if (!mus_l)
- return false;
-
- Abbreviation_req* a = dynamic_cast <Abbreviation_req *> (mus_l);
- if (!a)
- return false;
-
- abbrev_req_l_ = a;
-
- return true;
+ if (m->is_mus_type ("tremolo-event"))
+ {
+ tremolo_ev_ = m;
+ return true;
+ }
+ return false;
}
-IMPLEMENT_IS_TYPE_B1(Stem_engraver, Engraver);
-ADD_THIS_TRANSLATOR(Stem_engraver);
+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 */ "");
projects / lilypond.git / blobdiff