X-Git-Url: https://git.donarmstrong.com/?a=blobdiff_plain;f=lily%2Fbreak-align-item.cc;h=1d6c6cb89103860179deb40d423f29eb09afc148;hb=refs%2Ftags%2Frelease%2F1.3.8;hp=14ff34118bf470222d8a81e53cc776b0ee252dbb;hpb=0dc651561ed849b121d26cbd07a192e9fefeb832;p=lilypond.git

diff --git a/lily/break-align-item.cc b/lily/break-align-item.cc
index 14ff34118b..1d6c6cb891 100644
--- a/lily/break-align-item.cc
+++ b/lily/break-align-item.cc
@@ -3,17 +3,143 @@
 
   source file of the GNU LilyPond music typesetter
 
-  (c) 1997 Han-Wen Nienhuys <hanwen@stack.nl>
+  (c)  1997--1999 Han-Wen Nienhuys <hanwen@cs.uu.nl>
 */
 
+#include "dimension-cache.hh"
+#include "lily-guile.hh"
 #include "break-align-item.hh"
+#include "dimensions.hh"
+#include "paper-score.hh"
+#include "paper-def.hh"
+#include "paper-column.hh"
+
+/*
+  Handle spacing for prefatory matter. 
+
+  TODO: rewrite this.  It is kludgy
+*/
 
 void
 Break_align_item::do_pre_processing()
 {
+  if (break_status_dir() == LEFT)
+    align_dir_ = LEFT;
+  else
+    align_dir_ = RIGHT;
+  
+  flip (&align_dir_);
+  sort_elements ();
+  Real interline= paper_l ()->get_var ("interline");	
+  
+  Link_array<Score_element> elems;
+  for (int i=0; i < elem_l_arr_.size(); i++) 
+    {
+      Interval y = elem_l_arr_[i]->extent(axis ());
+      if (!y.empty_b())
+	elems.push (dynamic_cast<Score_element*> (elem_l_arr_[i]));
+    }
+  
+  if (!elems.size ())
+    return;
+
+  SCM symbol_list = SCM_EOL;
+  Array<Real> dists;
+  SCM current_origin = ly_str02scm ("");
+  for (int i=0; i <= elems.size (); i++)
+    {
+      Score_element *next_elt  = i < elems.size ()
+	? elems[i]
+	: 0 ;
+      
+      SCM next_origin;
+
+      if (next_elt)
+	{
+	  next_origin = next_elt->get_elt_property ("origin");
+	  next_origin =
+	    (next_origin == SCM_UNDEFINED)
+	    ? ly_str02scm ("")
+	    : next_origin;
+	}
+      else
+	next_origin = ly_str02scm ("begin-of-note");
+      
+      SCM extra_space
+	= scm_eval (scm_listify (ly_symbol2scm ("break-align-spacer"),
+				 current_origin, next_origin, SCM_UNDEFINED)); 
+      SCM symbol = SCM_CAR (extra_space);
+      Real spc = gh_scm2double (SCM_CADR(extra_space));
+      spc *= interline;
+
+      dists.push(spc);
+      symbol_list = gh_cons (symbol, symbol_list);
+      current_origin = next_origin;
+    }
+
+
+  // skip the first sym.
+  symbol_list  = SCM_CDR (scm_reverse (symbol_list));
+  for (int i=0; i <elems.size()-1; i++)
+    {
+      String sym_str = ly_scm2string (SCM_CAR (symbol_list));
+      elems[i]->set_elt_property (sym_str,
+				  scm_cons (gh_double2scm (0),
+					    gh_double2scm (dists[i+1])));
+
+      symbol_list = SCM_CDR (symbol_list);
+    }
 
-    align_i_ = break_status_i();
-    Horizontal_align_item::do_pre_processing();
+
+  // urg
+  SCM first_pair = elems[0]->get_elt_property ("minimum-space");
+  if (first_pair == SCM_UNDEFINED)
+    first_pair = gh_cons (gh_double2scm (0.0), gh_double2scm (0.0));
+  else
+    first_pair = first_pair;
+  
+  scm_set_car_x (first_pair, gh_double2scm (-dists[0]));
+  elems[0]->set_elt_property ("minimum-space", first_pair);
+  
+  Axis_align_item::do_pre_processing();
+
+
+  Real pre_space = elems[0]->extent (X_AXIS)[LEFT]
+    + elems[0]->relative_coordinate (column_l (), X_AXIS);
+  Real spring_len = elems.top ()->extent (X_AXIS)[RIGHT]
+    + elems.top ()->relative_coordinate (column_l (), X_AXIS);
+  
+  Real stretch_distance =0.;
+  
+  if (SCM_CAR (symbol_list) == ly_symbol2scm ("extra-space"))
+    {
+      spring_len += dists.top ();
+      stretch_distance = dists.top ();
+    }
+  else if (SCM_CAR (symbol_list) == ly_symbol2scm ("minimum-space"))
+    {
+      spring_len = spring_len >? dists.top ();
+      stretch_distance = spring_len;
+    }
+
+  /*
+    Hint the spacing engine how much space to put in.
+
+
+    The pairs are in the format of an interval (ie. CAR <  CDR).
+  */
+  column_l ()->set_elt_property ("extra-space",
+				 scm_cons (gh_double2scm (pre_space),
+					   gh_double2scm (spring_len)));
+
+  column_l ()->set_elt_property ("stretch-distance",
+				 gh_cons (gh_double2scm (-dists[0]),
+					  gh_double2scm (stretch_distance)));
+				 
+}
+
+Break_align_item::Break_align_item ()
+{
+  stacking_dir_ = RIGHT;
+  set_axis (X_AXIS);
 }
-IMPLEMENT_STATIC_NAME(Break_align_item);
-IMPLEMENT_IS_TYPE_B1(Break_align_item, Horizontal_align_item);