release: 1.1.0

[lilypond.git] / lily / tie.cc

diff --git a/lily/tie.cc b/lily/tie.cc
index 190618869bdfcb7f9fdfbeb2606c08253c554061..002c5e969478b3a621020b89d283840d4b2e1709 100644 (file)
--- a/lily/tie.cc
+++ b/lily/tie.cc
@@ -3,20 +3,23 @@
 
   source file of the GNU LilyPond music typesetter
 
-  (c) 1997 Han-Wen Nienhuys <hanwen@stack.nl>
+  (c)  1997--1998 Han-Wen Nienhuys <hanwen@cs.uu.nl>
 */
 
 #include "paper-def.hh"
 #include "tie.hh"
 #include "note-head.hh"
 #include "p-col.hh"
+#include "debug.hh"
 
+IMPLEMENT_IS_TYPE_B1(Tie,Bow);
 
 void
 Tie::set_head (Direction d, Note_head * head_l)
 {
   assert (!head_l_drul_[d]);
   head_l_drul_[d] = head_l;
+  set_bounds (d, head_l);
 
   add_dependency (head_l);
 }
@@ -28,67 +31,130 @@ Tie::Tie()
   same_pitch_b_ =false;
 }
 
+
+/*
+  ugh: direction of the Tie is more complicated.  See [Ross] p136 and further
+ */
 void
 Tie::set_default_dir()
 {
-  int m= (head_l_drul_[LEFT]->position_i_ + head_l_drul_[RIGHT]->position_i_) /2 ;
-  dir_ =  (m < 5)? DOWN : UP;  // UGH
+  int m= (head_l_drul_[LEFT]->position_i_ 
+         + head_l_drul_[RIGHT]->position_i_) /2;
+  dir_ =  (m < 0)? DOWN : UP;
 }
-  
 
 void
 Tie::do_add_processing()
 {
-  assert (head_l_drul_[LEFT] && head_l_drul_[RIGHT]);
-  set_bounds(LEFT,head_l_drul_[LEFT]);
-  set_bounds(RIGHT,head_l_drul_[RIGHT]);
+  if (!(head_l_drul_[LEFT] && head_l_drul_[RIGHT]))
+    warning (_ ("lonely tie"));
+
+  Direction d = LEFT;
+  Drul_array<Note_head *> new_head_drul = head_l_drul_;
+  do {
+    if (!head_l_drul_[d])
+      new_head_drul[d] = head_l_drul_[(Direction)-d];
+  } while (flip(&d) != LEFT);
+  head_l_drul_ = new_head_drul;
 }
 
 void
 Tie::do_post_processing()
 {
+  // URG: share code with slur!
   assert (head_l_drul_[LEFT] || head_l_drul_[RIGHT]);
 
+  Real notewidth = paper ()->note_width ();
+  Real interline_f = paper ()->interline_f ();
+  Real tie_min = paper ()->get_var ("tie_x_minimum");
+
+  /* 
+   [OSU]: slur and tie placement
+
+   ties:
+   * x = inner raakpunt - d * gap
+
+   * y = length < 5ss : horizontal raakpunt
+     y = length >= 5ss : y next interline - d * 0.25 ss
+     --> height <= 5 length ?? we use <= 3 length, now...
+   */
+
+  Real gap_f = paper ()->get_var ("slur_x_gap");
+
   Direction d = LEFT;
-  do 
+  do
     {
-      pos_i_drul_[d] =  (head_l_drul_[d])? 
-       head_l_drul_[d]->position_i_ : head_l_drul_[(Direction)-d]->position_i_;
+      dy_f_drul_[d] = .5 * interline_f * (head_l_drul_[d] 
+                      ? head_l_drul_[d]->position_i_
+                      : head_l_drul_[(Direction)-d]->position_i_);
     }
-  while ((d *= -1) != LEFT);
+  while (flip(&d) != LEFT);
 
-  do 
+  do
     {
-      if (head_l_drul_[d] && head_l_drul_[d]->extremal_i_) 
+      // tie attached to outer notehead
+      if (head_l_drul_[d] && head_l_drul_[d]->extremal_i_)
+       {
+         if (d == LEFT)
+           dx_f_drul_[d] += notewidth;
+         dx_f_drul_[d] += -d * gap_f;
+         /* attach to outer 3/4 end of head */
+         dy_f_drul_[d] += dir_ * 0.25 * interline_f;
+       }
+      // tie attached to inner notehead
+      else if (head_l_drul_[d] && d == LEFT)
        {
-         pos_i_drul_[d] += 2*dir_;
-         dx_f_drul_[d] += d * 0.25;
+         dx_f_drul_[d] += -d * notewidth;
        }
+      // uhm? loose end of tie // tie attached to stem
       else
-       dx_f_drul_[d] += d*0.5;
+       {
+         dx_f_drul_[d] = -d * (spanned_drul_[d]->width ().length () 
+                               -0.5 * notewidth);
+       }
     }
-  while ((d *= -1) != LEFT);
+  while (flip(&d) != LEFT);
 
-  do 
+  // now that both are set, do dependent
+  do
     {
+      // tie attached to outer notehead
       if (!head_l_drul_[d])
-       pos_i_drul_[d] = pos_i_drul_[(Direction)-d];
-    } 
-  while ((d *= -1) != LEFT);
+       {
+         if (dx_f_drul_[RIGHT] - dx_f_drul_[LEFT] < tie_min)
+           {
+             dx_f_drul_[d] -= d * tie_min 
+               - (dx_f_drul_[RIGHT] - dx_f_drul_[LEFT]);
+             dx_f_drul_[d] = dx_f_drul_[(Direction)-d] + d * tie_min;
+           }
+
+         dy_f_drul_[d] = dy_f_drul_[(Direction) -d];
+       }
+    }
+  while (flip(&d) != LEFT);
+
+  /*
+    Avoid too steep ties
+      * slur from notehead to stemend: c''()b''
+   */
+  Real damp_f = paper ()->get_var ("tie_slope_damping");
+  Offset d_off = Offset (dx_f_drul_[RIGHT] - dx_f_drul_[LEFT],
+    dy_f_drul_[RIGHT] - dy_f_drul_[LEFT]);
+  d_off.x () += width ().length ();
+
+  Real ratio_f = abs (d_off.y () / d_off.x ());
+  if (ratio_f > damp_f)
+    dy_f_drul_[(Direction)(- dir_ * sign (d_off.y ()))] -=
+      dir_ * (damp_f - ratio_f) * d_off.x ();
 }
 
-
-
 void
-Tie::do_substitute_dependency (Score_elem*o, Score_elem*n)
+Tie::do_substitute_dependency (Score_element*o, Score_element*n)
 {
-  Note_head *new_l =n?(Note_head*)n->item():0;
-  if (o->item() == head_l_drul_[LEFT])
+  Note_head *new_l =n?(Note_head*)dynamic_cast <Item *> (n):0;
+  if (dynamic_cast <Item *> (o) == head_l_drul_[LEFT])
     head_l_drul_[LEFT] = new_l;
-  else if (o->item() == head_l_drul_[RIGHT])
+  else if (dynamic_cast <Item *> (o) == head_l_drul_[RIGHT])
     head_l_drul_[RIGHT] = new_l;
 }
 
-
-
-IMPLEMENT_IS_TYPE_B1(Tie,Bow);