source file of the GNU LilyPond music typesetter
- (c) 2006--2007 Joe Neeman <joeneeman@gmail.com>
+ (c) 2006--2009 Joe Neeman <joeneeman@gmail.com>
*/
#ifndef PAGE_SPACING_HH
#define PAGE_SPACING_HH
#include "constrained-breaking.hh"
+#include "page-spacing-result.hh"
+
+/* This is a penalty that we add whenever a page breaking solution
+ is not bad enough to completely discard, but bad enough that
+ it is worse than any "proper" solution. For example, if we didn't
+ manage to fit systems on the desired number of pages or if there was
+ too big for a page.
+
+ This constant is large enough that it dominates any reasonable penalty,
+ but small enough that nothing will overflow to infinity (so that we
+ can still distinguish bad spacings by the number of BAD_SPACING_PENALTYs
+ that they incur.
+
+ BAD_SPACING_PENALTY is for occasions where the spacing is bad.
+ TERRIBLE_SPACING_PENALTY is for when we are disregarding a user override
+ (for example, we are failing to satisfy min-systems-per-page). These user
+ overrides are more important than getting good spacing, so they get a
+ larger penalty.
+*/
+const Real BAD_SPACING_PENALTY = 1e6;
+const Real TERRIBLE_SPACING_PENALTY = 1e8;
-struct Spacing_result {
- vector<vsize> systems_per_page_;
- vector<Real> force_;
- Real penalty_;
- Real demerits_;
-
- Spacing_result ()
- {
- penalty_ = 0;
- demerits_ = infinity_f;
- }
-};
/* 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_breaking;
-
class Page_spacer
{
public:
Page_spacer (vector<Line_details> const &lines, vsize first_page_num, Page_breaking const*);
- Spacing_result solve (vsize page_count);
+ Page_spacing_result solve (vsize page_count);
private:
struct Page_spacing_node
force_ = infinity_f;
penalty_ = infinity_f;
prev_ = VPOS;
+ system_count_status_ = SYSTEM_COUNT_OK;
}
Real demerits_;
Real force_;
Real penalty_;
vsize prev_;
+ int system_count_status_;
};
Page_breaking const *breaker_;
Real inverse_spring_k_;
Line_details last_line_;
+ Line_details first_line_;
+ Page_breaking const *breaker_;
- Page_spacing (Real page_height)
+ Page_spacing (Real page_height, Page_breaking const *breaker)
{
page_height_ = page_height;
+ breaker_ = breaker;
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 ();
};
-Real line_space (Line_details const &line);
#endif /* PAGE_SPACING_HH */