release: 1.5.29

[lilypond.git] / lily / note-head-line-engraver.cc

diff --git a/lily/note-head-line-engraver.cc b/lily/note-head-line-engraver.cc
index ae21145eca4df53522e2d057096545e571fffd27..c37e613432006696942f7e17939605efbed3c8a9 100644 (file)
--- a/lily/note-head-line-engraver.cc
+++ b/lily/note-head-line-engraver.cc
@@ -3,7 +3,7 @@
   
   source file of the GNU LilyPond music typesetter
   
-  (c) 2000 Jan Nieuwenhuizen <janneke@gnu.org>
+  (c) 2000--2002 Jan Nieuwenhuizen <janneke@gnu.org>
  */
 
 #include "engraver.hh"
@@ -11,6 +11,7 @@
 #include "item.hh"
 #include "musical-request.hh"
 #include "spanner.hh"
+#include "stem.hh"
 #include "rhythmic-head.hh"
 #include "side-position-interface.hh"
 #include "staff-symbol-referencer.hh"
@@ -19,13 +20,16 @@
 /**
    Create line-spanner grobs for glissandi (and possibly other) 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);
@@ -38,6 +42,7 @@ private:
   Request* req_;
   Request* last_req_;
   Translator* last_staff_;
+  bool follow_;
   Grob* head_;
   Grob* last_head_;
 };
@@ -47,6 +52,7 @@ 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;
@@ -69,47 +75,55 @@ Note_head_line_engraver::try_music (Music* m)
 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_l_))
     {
-      last_head_ = head_;
-      head_ = info.elem_l_;
-      if (to_boolean (get_property ("followThread")))
+      head_ = info.grob_l_;
+      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_l_;
+         while (tr && tr->type_str_ != "Staff")
+           tr = tr->daddy_trans_l_ ;
+
+         if (tr && tr->type_str_ == "Staff" && tr != last_staff_)
            {
              if (last_head_)
-               last_req_ = (Request*)1; // ugh
-             last_staff_ = staff;
+               follow_ = true;
+             last_staff_ = tr;
            }
        }
     }
 }
 
+
 void
 Note_head_line_engraver::create_grobs ()
 {
-  if (!line_ && last_req_ && last_head_ && head_)
+  if (!line_ && (follow_ || last_req_) && last_head_ && head_
+      && (last_head_ != head_))
     {
-      /* type Glissando? */
-      line_ = new Spanner (get_property ("NoteHeadLine"));
-      line_->set_bound (LEFT, head_);
-      line_->set_bound (RIGHT, last_head_);
-
-      line_->set_parent (head_, X_AXIS);
-      line_->set_parent (head_, Y_AXIS);
-
-      line_->set_parent (last_head_, X_AXIS);
-      line_->set_parent (last_head_, Y_AXIS);
-
-      if ((int)last_req_ == 1) // ugh
-       last_req_ = 0;
-      
+      /* TODO: Don't follow if there's 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_)
+       line_ = new Spanner (get_property ("VoiceFollower"));
+      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);
+         
       announce_grob (line_, last_req_);
-      last_req_ = 0;
-      last_head_ = head_;
-      head_ = 0;
+      last_req_ = 0;   
+
+      follow_ = false;
     }
 }
 
@@ -121,11 +135,24 @@ Note_head_line_engraver::stop_translation_timestep ()
       typeset_grob (line_);
       line_ = 0;
     }
+  if (head_)
+    last_head_ = head_;
+  head_ = 0;
+
   if (req_)
-    last_req_ = req_;
-  req_ = 0;
+    {
+      last_req_ = req_;
+      req_ =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",
+/* acks  */       "rhythmic-head-interface",
+/* reads */       "followVoice",
+/* write */       "");