Run `make grand-replace'.

[lilypond.git] / lily / include / page-spacing.hh

diff --git a/lily/include/page-spacing.hh b/lily/include/page-spacing.hh
index e7e3b4888ab38cf7c63a95cf6d51c8ff9f4b4277..846fe1be3e12043f86db917733283eb0eacd345b 100644 (file)
--- a/lily/include/page-spacing.hh
+++ b/lily/include/page-spacing.hh
@@ -4,34 +4,80 @@
 
   source file of the GNU LilyPond music typesetter
 
-  (c) 2006 Joe Neeman <joeneeman@gmail.com>
+  (c) 2006--2008 Joe Neeman <joeneeman@gmail.com>
 */
 
 #ifndef PAGE_SPACING_HH
 #define PAGE_SPACING_HH
 
 #include "constrained-breaking.hh"
+#include "page-spacing-result.hh"
 
-struct Spacing_result {
-  vector<vsize> systems_per_page_;
-  vector<Real> force_;
-  Real penalty_;
-  Real demerits_;
 
-  Spacing_result ()
+/* for page_count > 2, we use a dynamic algorithm similar to
+   constrained-breaking -- we have a class that stores the intermediate
+   calculations so they can be reused for querying different page counts.
+*/
+class Page_spacer
+{
+public:
+  Page_spacer (vector<Line_details> const &lines, vsize first_page_num, Page_breaking const*);
+  Page_spacing_result solve (vsize page_count);
+
+private:
+  struct Page_spacing_node
   {
-    penalty_ = 0;
-    demerits_ = 0;
-  }
+    Page_spacing_node ()
+    {
+      demerits_ = infinity_f;
+      force_ = infinity_f;
+      penalty_ = infinity_f;
+      prev_ = VPOS;
+    }
+
+    Real demerits_;
+    Real force_;
+    Real penalty_;
+    vsize prev_;
+  };
+
+  Page_breaking const *breaker_;
+  vsize first_page_num_;
+  vector<Line_details> lines_;
+  Matrix<Page_spacing_node> state_;
+  vsize max_page_count_;
+
+  bool ragged_;
+  bool ragged_last_;
+
+  void resize (vsize page_count);
+  bool calc_subproblem (vsize page, vsize lines);
 };
 
-Spacing_result
-space_systems_on_min_pages (vector<Line_details> const&,
-                           Real page_height,
-                           Real odd_pages_penalty);
-Spacing_result
-space_systems_on_best_pages (vector<Line_details> const&,
-                            Real page_height,
-                            Real odd_pages_penalty);
+struct Page_spacing
+{
+  Real force_;
+  Real page_height_;
+  Real rod_height_;
+  Real spring_len_;
+  Real inverse_spring_k_;
+  Real page_top_space_;
+
+  Line_details last_line_;
+  Line_details first_line_;
+
+  Page_spacing (Real page_height, Real page_top_space)
+  {
+    page_height_ = page_height;
+    page_top_space_ = page_top_space;
+    clear ();
+  }
+
+  void calc_force ();
+  void resize (Real new_height);
+  void append_system (const Line_details &line);
+  void prepend_system (const Line_details &line);
+  void clear ();
+};
 
 #endif /* PAGE_SPACING_HH */