release: 1.1.67

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

diff --git a/lily/break-align-item.cc b/lily/break-align-item.cc
index 808a7813d8d02ec6f8f064703a837b087ab7383b..1e65bbe23ee972c77ee18fabe6e0e28fae476b10 100644 (file)
--- a/lily/break-align-item.cc
+++ b/lily/break-align-item.cc
@@ -3,16 +3,184 @@
 
   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_realvar (interline_scm_sym); 
+  
+  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 = gh_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_scm_sym);
+         next_origin =
+           (next_origin == SCM_BOOL_F)
+           ? gh_str02scm ("")
+           : SCM_CDR (next_origin);
+       }
+      else
+       next_origin = gh_str02scm ("begin-of-note");
+      
+      SCM extra_space
+       = scm_eval (scm_listify (ly_symbol ("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++)
+    {
+      elems[i]->set_elt_property (SCM_CAR (symbol_list),
+                                 scm_cons (gh_double2scm (0),
+                                           gh_double2scm (dists[i+1])));
+
+      symbol_list = SCM_CDR (symbol_list);
+    }
+
+
+  // urg
+  SCM first_pair = elems[0]->get_elt_property (minimum_space_scm_sym);
+  if (first_pair == SCM_BOOL_F)
+    first_pair = gh_cons (gh_double2scm (0.0), gh_double2scm (0.0));
+  else
+    first_pair = SCM_CDR (first_pair);
+  
+  scm_set_car_x (first_pair, gh_double2scm (-dists[0]));
+  elems[0]->set_elt_property (minimum_space_scm_sym, first_pair);
+  
+  Axis_align_item::do_pre_processing();
+
+
+  Real pre_space = elems[0]->extent (X_AXIS)[LEFT]
+    + elems[0]->relative_coordinate (column_l ()->dim_cache_[X_AXIS], X_AXIS);
+  Real spring_len = elems.top ()->extent (X_AXIS)[RIGHT]
+    + elems.top ()->relative_coordinate (column_l ()->dim_cache_[X_AXIS], X_AXIS);
+  
+  Real stretch_distance =0.;
+  
+  if (SCM_CAR (symbol_list) == extra_space_scm_sym)
+    {
+      spring_len += dists.top ();
+      stretch_distance = dists.top ();
+    }
+  else if (SCM_CAR (symbol_list) == minimum_space_scm_sym)
+    {
+      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_sym,
+                                scm_cons (gh_double2scm (pre_space),
+                                          gh_double2scm (spring_len)));
+
+  column_l ()->set_elt_property (stretch_distance_scm_sym,
+                                gh_cons (gh_double2scm (-dists[0]),
+                                         gh_double2scm (stretch_distance)));
+                                
+}
+
+
+
+Break_align_item::Break_align_item ()
+{
+  stacking_dir_ = RIGHT;
+  set_axis (X_AXIS);
+}
+
+void
+Break_align_item::add_breakable_item (Item *it)
+{
+  SCM pr = it->remove_elt_property (break_priority_scm_sym); 
+
+  if (pr == SCM_BOOL_F)
+    return;
+
+  int priority = gh_scm2int (SCM_CDR (pr));
+
+  Score_element * column_l = get_elt_by_priority (priority);
+  Axis_group_item * hg=0;
+  if (column_l)
+    {
+      hg = dynamic_cast<Axis_group_item*> (column_l);
+    }
+  else
+    {
+      hg = new Axis_group_item;
+      hg->set_axes (X_AXIS,X_AXIS);
+
+      /*
+       this is quite ridiculous, but we do this anyway, to ensure that no
+       warning bells about missing Y refpoints go off later on.
+      */
+      hg->dim_cache_[Y_AXIS]->parent_l_ = dim_cache_[Y_AXIS];
+      hg->set_elt_property (ly_symbol("origin"), gh_str02scm (it->name()));
+
+      pscore_l_->typeset_element (hg);
+      add_element_priority (hg, priority);
 
-    align_i_ = break_status_i();
-    Horizontal_align_item::do_pre_processing();
+      if (priority == 0)
+       center_l_ = hg;
+    }
+  
+  hg->add_element (it);
 }
-IMPLEMENT_STATIC_NAME(Break_align_item);
-IMPLEMENT_IS_TYPE_B1(Break_align_item, Horizontal_align_item);