release: 1.3.26

[lilypond.git] / lily / break-align-item.cc

diff --git a/lily/break-align-item.cc b/lily/break-align-item.cc
index 53f81fe3e3799f089fa222733519b661b112d65a..376a71dd25498005e01b69a1d8b8bd5af06759d8 100644 (file)
--- a/lily/break-align-item.cc
+++ b/lily/break-align-item.cc
@@ -3,19 +3,157 @@
 
   source file of the GNU LilyPond music typesetter
 
-  (c)  1997--1998 Han-Wen Nienhuys <hanwen@cs.uu.nl>
+  (c)  1997--2000 Han-Wen Nienhuys <hanwen@cs.uu.nl>
 */
+#include <math.h>
 
+#include "warn.hh"
+#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()
 {
-  align_dir_ = break_status_dir();
-  threshold_interval_[SMALLER] = 1.5 PT;
+  if (break_status_dir() == LEFT)
+    align_dir_ = LEFT;
+  else
+    align_dir_ = RIGHT;
+  
   flip (&align_dir_);
-  Horizontal_align_item::do_pre_processing();
-}
+
+  Real interline= paper_l ()->get_var ("interline");   
+  
+  Link_array<Score_element> elems;
+  Link_array<Score_element> all_elems (elem_l_arr ());
+  
+  for (int i=0; i < all_elems.size(); i++) 
+    {
+      Interval y = all_elems[i]->extent(axis ());
+      if (!y.empty_b())
+       elems.push (dynamic_cast<Score_element*> (all_elems[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 = gh_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  = gh_cdr (scm_reverse (symbol_list));
+  for (int i=0; i <elems.size()-1; i++)
+    {
+      String sym_str = ly_symbol2string (gh_car  (symbol_list));
+      elems[i]->set_elt_property (sym_str,
+                                 scm_cons (gh_double2scm (0),
+                                           gh_double2scm (dists[i+1])));
+
+      symbol_list = gh_cdr (symbol_list);
+    }
 
 
+  // urg
+  SCM first_pair = elems[0]->get_elt_property ("minimum-space");
+  if (gh_pair_p (first_pair))
+    first_pair = first_pair;
+  else
+    first_pair = gh_cons (gh_double2scm (0.0), gh_double2scm (0.0));
+  
+  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]->relative_coordinate (column_l (), X_AXIS);
+
+  Real xl = elems[0]->extent (X_AXIS)[LEFT];
+  if (!isinf (xl))
+    pre_space += xl;
+  else
+    programming_error ("Infinity reached. ");
+
+  Real xr = elems.top ()->extent (X_AXIS)[RIGHT];
+  Real spring_len = elems.top ()->relative_coordinate (column_l (), X_AXIS);
+  if (!isinf (xr))
+    spring_len += xr;
+  else
+    programming_error ("Infinity reached.");
+  
+  Real stretch_distance =0.;
+  
+  if (gh_car  (symbol_list) == ly_symbol2scm ("extra-space"))
+    {
+      spring_len += dists.top ();
+      stretch_distance = dists.top ();
+    }
+  else if (gh_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);
+}