X-Git-Url: https://git.donarmstrong.com/?a=blobdiff_plain;f=lily%2Foptimal-page-breaking.cc;h=f495ab7fa6b6b23d84b21955dfd19598fad3e7ea;hb=5b4b0d6e9a197e8f9eb085b7c2ad78b8be3e5cfc;hp=a0ba883396d5874e0f7cd397660c2ac166b3b9eb;hpb=4c72b133f96204598051fea3d55c78329f368866;p=lilypond.git

diff --git a/lily/optimal-page-breaking.cc b/lily/optimal-page-breaking.cc
index a0ba883396..f495ab7fa6 100644
--- a/lily/optimal-page-breaking.cc
+++ b/lily/optimal-page-breaking.cc
@@ -5,7 +5,7 @@
 
   source file of the GNU LilyPond music typesetter
 
-  (c) 2006--2007 Joe Neeman <joeneeman@gmail.com>
+  (c) 2006--2008 Joe Neeman <joeneeman@gmail.com>
 */
 
 #include "international.hh"
@@ -39,24 +39,45 @@ Optimal_page_breaking::solve ()
   vsize end = last_break_position ();
   vsize max_sys_count = max_system_count (0, end);
   vsize first_page_num = robust_scm2int (book_->paper_->c_variable ("first-page-number"), 1);
+  SCM forced_page_count = book_->paper_->c_variable ("page-count");
 
-  /* find out the ideal number of pages */
-  message (_ ("Finding the ideal number of pages..."));
   set_to_ideal_line_configuration (0, end);
-  
+
+  Page_spacing_result best;
+  vsize page_count = robust_scm2int (forced_page_count, 1);
   Line_division ideal_line_division = current_configuration (0);
-  Page_spacing_result best = space_systems_on_best_pages (0, first_page_num);
-  vsize page_count = best.systems_per_page_.size ();
   Line_division best_division = ideal_line_division;
+  vsize min_sys_count = 1;
+  vsize ideal_sys_count = system_count ();
+  
+  if (!scm_is_integer (forced_page_count))
+    {
+      /* find out the ideal number of pages */
+      message (_ ("Finding the ideal number of pages..."));
+  
+      best = space_systems_on_best_pages (0, first_page_num);
+      page_count = best.systems_per_page_.size ();
 
-  vsize ideal_sys_count = best.system_count ();
-  vsize min_sys_count = ideal_sys_count - best.systems_per_page_.back ();
+      ideal_sys_count = best.system_count ();
+      min_sys_count = ideal_sys_count - best.systems_per_page_.back ();
   
-  if (page_count > 1)
-    min_sys_count -= best.systems_per_page_[page_count - 2];
+      if (page_count > 1 && best.systems_per_page_[page_count - 2] > 1)
+	min_sys_count -= best.systems_per_page_[page_count - 2];
+
+      min_sys_count = max (min_sys_count, (vsize)1);
+    }
+  else
+    {
+      /* todo: the following line will spit out programming errors if the
+	 ideal line spacing doesn't fit on PAGE_COUNT pages */
+      best = space_systems_on_n_pages (0, page_count, first_page_num);
+      min_sys_count = page_count;
+    }
 
   if (page_count == 1)
     message (_ ("Fitting music on 1 page..."));
+  else if (scm_is_integer (forced_page_count))
+    message (_f ("Fitting music on %d pages...", (int)page_count));
   else
     message (_f ("Fitting music on %d or %d pages...", (int)page_count-1, (int)page_count));
 
@@ -72,9 +93,7 @@ Optimal_page_breaking::solve ()
 	  vsize min_p_count = min_page_count (i, first_page_num);
 	  Page_spacing_result cur;
 
-	  if (min_p_count > page_count)
-	    continue;
-	  else if (min_p_count == page_count)
+	  if (min_p_count == page_count || scm_is_integer (forced_page_count))
 	    cur = space_systems_on_n_pages (i, page_count, first_page_num);
 	  else
 	    cur = space_systems_on_n_or_one_more_pages (i, page_count-1, first_page_num);
@@ -92,15 +111,11 @@ Optimal_page_breaking::solve ()
 	  best_division = bound;
 	}
 
-      if (best_for_this_sys_count.systems_per_page_.size () < page_count)
-	{
-	  /* if the pages are stretched on average, stop trying to reduce sys_count */
-	  Real avg_f = 0;
-	  for (vsize i = 0; i < best_for_this_sys_count.systems_per_page_.size (); i++)
-	    avg_f += best_for_this_sys_count.systems_per_page_[i];
-	  if (avg_f > 0)
-	    break;
-	}
+      /* if the pages are stretched on average, stop trying to reduce sys_count */
+      if (best_for_this_sys_count.page_count () < page_count
+	  && best_for_this_sys_count.average_force () > 0)
+	break;
+	
 
       if (isinf (best_for_this_sys_count.demerits_))
 	break;
@@ -141,7 +156,7 @@ Optimal_page_breaking::solve ()
 	break;
     }
 
-  message ("Drawing systems...");
+  message (_ ("Drawing systems..."));
   break_into_pieces (0, end, best_division);
   SCM lines = systems ();
   return make_pages (best.systems_per_page_, lines);