2003 -> 2004

[lilypond.git] / lily / hyphen-spanner.cc

diff --git a/lily/hyphen-spanner.cc b/lily/hyphen-spanner.cc
index 3fd4f63bc992c59cd6fa08a3c25fd4125b3a2fcd..09699d7546cf4c55676f86ac1b0429f2351684bf 100644 (file)
--- a/lily/hyphen-spanner.cc
+++ b/lily/hyphen-spanner.cc
@@ -3,84 +3,88 @@
 
   source file of the GNU LilyPond music typesetter
 
-  (c) 1999 Glen Prideaux <glenprideaux@iname.com>
+  (c) 1999--2004 Glen Prideaux <glenprideaux@iname.com>
 
-  (adapted from extender-spanner)
+ (adapted from lyric-extender)
 */
 
-/*
-  TODO: too complicated implementation.  Why the dx_drul?.
- */
-
 #include <math.h>
+
 #include "box.hh"
-#include "debug.hh"
 #include "lookup.hh"
 #include "molecule.hh"
-#include "paper-column.hh"
 #include "paper-def.hh"
 #include "hyphen-spanner.hh"
-#include "dimension-cache.hh"
+#include "paper-column.hh"
+#include "spanner.hh"
+#include "item.hh"
 
-Hyphen_spanner::Hyphen_spanner ()
-  : Spanner ()
-{
-  dx_f_drul_[LEFT] = dx_f_drul_[RIGHT] = 0.0;
 
-  dim_cache_[Y_AXIS]->set_callback (Dimension_cache::point_dimension_callback);
-}
-
-Molecule 
-Hyphen_spanner::do_brew_molecule () const
+MAKE_SCHEME_CALLBACK (Hyphen_spanner,brew_molecule,1)
+SCM 
+Hyphen_spanner::brew_molecule (SCM smob)
 {
-  Molecule  mol;
-
-  Real w = spanner_length ();
+  Spanner * sp = unsmob_spanner (smob);
+  Drul_array<Item*> bounds (sp->get_bound (LEFT),
+                           sp->get_bound (RIGHT));
+  
+  Grob * common = bounds[LEFT]->common_refpoint (bounds[RIGHT], X_AXIS);
 
-  w += (dx_f_drul_[RIGHT] - dx_f_drul_[LEFT]);
+  Interval span_points;
+  Direction d = LEFT;
+  do
+    {
+      Interval iv = bounds[d]->extent (common, X_AXIS);
 
-  Real th = paper_l ()->get_var ("hyphen_thickness");
-  Real h = paper_l ()->get_var ("hyphen_height");
+      span_points[d] = iv.is_empty ()
+       ? bounds[d]->relative_coordinate (common, X_AXIS)
+       : iv[-d];
+    }
+  while (flip (&d) != LEFT);
+  
+  Real lt = sp->get_paper ()->get_realvar (ly_symbol2scm ("linethickness"));
+  Real th = robust_scm2double (sp->get_grob_property ("thickness"), 1) * lt ;
+  Real h = robust_scm2double (sp->get_grob_property ("height"), 0.5);
 
-  // UGH. First try: just make the hyphen take 1/3 of the available space  
-  // for length, use a geometric mean of the available space and some minimum
-  Real l = paper_l ()->get_var ("hyphen_minimum_length");
-  if(l < w)
-    l = sqrt(l*w);
-  Molecule a = lookup_l ()->filledbox ( Box (Interval ((w-l)/2,(w+l)/2), Interval (h,h+th)));
-  a.translate (Offset (dx_f_drul_[LEFT], 0));
+  // interval?
+  
+  Real dp = robust_scm2double (sp->get_grob_property ("dash-period"), 1.0);
+  Real dl = robust_scm2double (sp->get_grob_property ("length"), .5 );
 
-  mol.add_molecule (a);
+  if (dp < dl)
+    dp = 1.5 * dl;
 
-  return mol;
-}
+  Real l = span_points.length ();
+  int n = int (ceil (l/dp - 0.5));
+  if (n <= 0)
+    n = 1;
 
+  Real space_left = l - dl - (n-1)* dp;
 
-void
-Hyphen_spanner::do_post_processing ()
-{
-  // UGH
-  Real gap = paper_l ()->get_var ("interline");
+  /*
+    If there is not enough space, the hyphen should disappear.
+   */
+  if (space_left < 0)
+    return SCM_EOL;
+  
+  Box b (Interval (0, dl), Interval (h,h+th));
+  Molecule dash_mol (Lookup::round_filled_box (b, 0.8 * lt));
 
-  Direction d = LEFT;
-  do
+  Molecule total;
+  for (int i = 0; i < n; i++)
     {
-      Item* t = get_bound (d)
-       ? get_bound (d) : get_bound ((Direction)-d);
-      if (d == LEFT)
-        dx_f_drul_[d] += t->extent (X_AXIS).length ();
-      else
-       dx_f_drul_[d] -= d * gap / 2;
+      Molecule m (dash_mol);
+      m.translate_axis (span_points[LEFT] + i * dp + space_left / 2, X_AXIS);
+      total.add_molecule (m);
     }
-  while (flip(&d) != LEFT);
-}
 
-  
-void
-Hyphen_spanner::set_textitem (Direction d, Item* textitem_l)
-{
-  set_bound (d, textitem_l);
-  add_dependency (textitem_l);
+  total.translate_axis ( -sp->relative_coordinate (common, X_AXIS), X_AXIS);
+  return total.smobbed_copy ();
 }
 
 
+ADD_INTERFACE (Hyphen_spanner, "lyric-hyphen-interface",
+              "A centred hyphen is a simple line between lyrics used to divide syllables",
+              "thickness height dash-period length");
+
+