source file of the GNU LilyPond music typesetter
- (c) 2006 Joe Neeman <joeneeman@gmail.com>
+ (c) 2006--2007 Joe Neeman <joeneeman@gmail.com>
*/
#include "optimal-page-breaking.hh"
{
}
-Spacing_result
-Optimal_page_breaking::try_page_spacing (Line_division const &line_count)
-{
- vector<Line_details> lines = line_details (0, breaks_.size () - 1, line_count);
- Real page_h = page_height (1, false); // FIXME
- SCM force_sym = ly_symbol2scm ("blank-last-page-force");
- Real blank_force = robust_scm2double (book_->paper_->lookup_variable (force_sym), 0);
- bool ragged_all = to_boolean (book_->paper_->c_variable ("ragged-bottom"));
- bool ragged_last = to_boolean (book_->paper_->c_variable ("ragged-last-bottom"));
- Spacing_result ret = space_systems_on_best_pages (lines,
- page_h,
- blank_force,
- ragged_all,
- ragged_last);
-
- /* add in the line penalties */
- Real line_force = 0;
- Real line_penalty = 0;
- Real page_weighting = robust_scm2double (book_->paper_->c_variable ("page-spacing-weight"), 10);
-
- for (vsize i = 0; i < lines.size (); i++)
- {
- line_force += lines[i].force_ * lines[i].force_;
- line_penalty += lines[i].break_penalty_;
- }
-
- ret.demerits_ = ret.force_[0] * ret.force_[0] * page_weighting;
- for (vsize i = 1; i < ret.force_.size (); i++)
- {
- Real uniformity = fabs (ret.force_[i] - ret.force_[i-1]);
- ret.demerits_ += (ret.force_[i] * ret.force_[i]
- + uniformity * uniformity) * page_weighting;
- }
-
- /* for a while we tried averaging page and line forces instead of summing
- them, but it caused the following problem. If there is a single page
- with a very bad page force (for example because of a forced page break),
- the page breaker will put in a _lot_ of pages so that the bad force
- becomes averaged out over many pages. */
- ret.demerits_ += line_force + line_penalty;
- return ret;
-}
-
SCM
Optimal_page_breaking::solve ()
{
Spacing_result best;
Line_division best_division;
Line_division lower_bound;
+ vsize first_page_num = robust_scm2int (book_->paper_->c_variable ("first-page-number"), 1);
for (vsize sys_count = min_sys_count;
cur_page_count <= max_page_count && sys_count <= max_sys_count;
sys_count++)
{
- Real this_best_demerits = infinity_f;
- vector<Line_division> div = line_divisions (0, end, sys_count, lower_bound);
- for (vsize d = 0; d < div.size (); d++)
+ Real best_demerits_for_this_sys_count = infinity_f;
+ set_current_breakpoints (0, end, sys_count, lower_bound);
+
+ for (vsize i = 0; i < current_configuration_count (); i++)
{
- Spacing_result cur = try_page_spacing (div[d]);
+ Spacing_result cur = space_systems_on_best_pages (i, first_page_num);
cur_page_count = cur.systems_per_page_.size ();
if (cur.demerits_ < best.demerits_ || isinf (best.demerits_))
{
best = cur;
- best_division = div[d];
+ best_division = current_configuration (i);
}
- if (cur.demerits_ < this_best_demerits || isinf (best.demerits_))
+ if (cur.demerits_ < best_demerits_for_this_sys_count || isinf (best.demerits_))
{
- this_best_demerits = cur.demerits_;
- lower_bound = div[d];
+ best_demerits_for_this_sys_count = cur.demerits_;
+ lower_bound = current_configuration (i);
}
- vector<Line_details> det = line_details (0, end, div[d]);
- bool all_lines_stretched = true;
- for (vsize i = 0; i < det.size (); i++)
- if (det[i].force_ < 0)
- all_lines_stretched = false;
-
- if (all_lines_stretched)
+ if (all_lines_stretched (i))
max_page_count = min (max_page_count, cur_page_count + 1);
}
}