source file of the GNU LilyPond music typesetter
- (c) 2000 Jan Nieuwenhuizen <janneke@gnu.org>
+ (c) 2000--2003 Jan Nieuwenhuizen <janneke@gnu.org>
*/
#include "engraver.hh"
#include "group-interface.hh"
#include "item.hh"
-#include "musical-request.hh"
+#include "event.hh"
#include "spanner.hh"
#include "stem.hh"
#include "rhythmic-head.hh"
#include "translator-group.hh"
/**
- Create line-spanner grobs for glissandi (and possibly other) lines
- that connect note heads.
- */
+ Create line-spanner grobs for lines that connect note heads.
+
+ TODO: have the line commit suicide if the notes are connected with
+ either slur or beam.
+*/
class Note_head_line_engraver : public Engraver
{
public:
- VIRTUAL_COPY_CONS (Translator);
- Note_head_line_engraver ();
+ TRANSLATOR_DECLARATIONS(Note_head_line_engraver);
protected:
virtual void acknowledge_grob (Grob_info);
- virtual void create_grobs ();
+ virtual void process_acknowledged_grobs ();
virtual void stop_translation_timestep ();
- virtual bool try_music (Music *);
private:
Spanner* line_;
- Request* req_;
- Request* last_req_;
Translator* last_staff_;
bool follow_;
Grob* head_;
Note_head_line_engraver::Note_head_line_engraver ()
{
line_ = 0;
- req_ = 0;
- last_req_ = 0;
follow_ = false;
head_ = 0;
last_head_ = 0;
last_staff_ = 0;
}
-bool
-Note_head_line_engraver::try_music (Music* m)
-{
- if (!req_)
- {
- if (Glissando_req *r = dynamic_cast<Glissando_req*> (m))
- {
- req_ = r;
- return true;
- }
- }
- return false;
-}
-
void
Note_head_line_engraver::acknowledge_grob (Grob_info info)
{
- if (Rhythmic_head::has_interface (info.elem_l_))
+ if (Rhythmic_head::has_interface (info.grob_))
{
- last_head_ = head_;
- head_ = info.elem_l_;
- if (to_boolean (get_property ("followThread")))
+ head_ = info.grob_;
+ if (to_boolean (get_property ("followVoice")))
{
- Translator* staff = daddy_trans_l_ && daddy_trans_l_->daddy_trans_l_
- ? daddy_trans_l_->daddy_trans_l_->daddy_trans_l_ : 0;
- if (staff != last_staff_)
+ Translator_group * tr = daddy_trans_;
+ while (tr && !tr->is_alias (ly_symbol2scm ( "Staff")))
+ tr = tr->daddy_trans_ ;
+
+ if (tr && tr->is_alias (ly_symbol2scm ("Staff")) && tr != last_staff_)
{
if (last_head_)
follow_ = true;
- last_staff_ = staff;
+ last_staff_ = tr;
}
}
}
}
-static Grob*
-beam_l (Grob *h)
-{
- if (Grob *s = Rhythmic_head::stem_l (h))
- return Stem::beam_l (s);
- return 0;
-}
void
-Note_head_line_engraver::create_grobs ()
+Note_head_line_engraver::process_acknowledged_grobs ()
{
- if (!line_ && (follow_ || last_req_) && last_head_ && head_
- && (last_head_ != head_))
+ if (!line_ && follow_ && last_head_ && head_)
{
- /* Don't follow if there's a beam.
+ /* TODO: Don't follow if there's a beam.
- Hmm, this doesn't work, as head_ does not yet have a beam.
+ We can't do beam-stuff here, since beam doesn't exist yet.
Should probably store follow_ in line_, and suicide at some
later point */
- if (!(follow_
- && beam_l (last_head_) && beam_l (last_head_) == beam_l (head_)))
- {
- if (follow_)
- line_ = new Spanner (get_property ("FollowThread"));
- else
- line_ = new Spanner (get_property ("Glissando"));
-
- line_->set_bound (LEFT, last_head_);
- line_->set_bound (RIGHT, head_);
-
- /* Note, mustn't set y-parent of breakable symbol to simple item:
- one of the two broken parts won't have an y-parent! */
- /* X parent is set by set_bound */
- line_->set_parent (Staff_symbol_referencer::staff_symbol_l (last_head_),
- Y_AXIS);
+ if (follow_)
+ line_ = make_spanner ("VoiceFollower");
- announce_grob (line_, last_req_);
- }
-
- last_head_ = 0;
- if (!follow_ && !req_)
- head_ = 0;
+ line_->set_bound (LEFT, last_head_);
+ line_->set_bound (RIGHT, head_);
- last_req_ = 0;
+ announce_grob(line_, head_->self_scm ());
+
follow_ = false;
}
}
typeset_grob (line_);
line_ = 0;
}
- last_req_ = req_;
- req_ = 0;
+ if (head_)
+ last_head_ = head_;
+ head_ = 0;
}
-ADD_THIS_TRANSLATOR (Note_head_line_engraver);
+
+ENTER_DESCRIPTION(Note_head_line_engraver,
+/* descr */ "Engrave a line between two note heads, for example a glissando. If "
+" followVoice is set, staff switches also generate a line.",
+/* creats*/ "Glissando VoiceFollower",
+/* accepts */ "glissando-event",
+/* acks */ "rhythmic-head-interface",
+/* reads */ "followVoice",
+/* write */ "");