/*
- page-breaking.cc -- implement a superclass and utility
- functions shared by various page-breaking algorithms
+ This file is part of LilyPond, the GNU music typesetter.
- source file of the GNU LilyPond music typesetter
+ Copyright (C) 2006--2010 Joe Neeman <joeneeman@gmail.com>
- (c) 2006--2009 Joe Neeman <joeneeman@gmail.com>
+ LilyPond is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
+
+ LilyPond is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with LilyPond. If not, see <http://www.gnu.org/licenses/>.
*/
/*
{
Line_details const &old = ret.back ();
Line_details compressed = orig[i];
- Real padding = orig[i].title_ ? old.title_padding_ : old.padding_;
-
- compressed.extent_[DOWN] = old.extent_[DOWN];
- compressed.extent_[UP] = old.extent_[UP] + orig[i].extent_.length () + padding;
+ /*
+ "padding" is the padding below the current line. The padding below
+ "old" (taking into account whether "old" is a title) is already
+ accounted for in the extent of the compressed line. The padding
+ below the compressed line, therefore, should depend on whether its
+ bottom-most line is a title or not.
+ */
+ Real padding = 0;
+ if (!orig[i].tight_spacing_)
+ padding = orig[i].title_ ? old.title_padding_ : old.padding_;
+
+ compressed.shape_ = old.shape_.piggyback (orig[i].shape_, padding);
compressed.space_ += old.space_;
compressed.inverse_hooke_ += old.inverse_hooke_;
systems_per_page_ = max (0, robust_scm2int (pb->paper_->c_variable ("systems-per-page"), 0));
max_systems_per_page_ = max (0, robust_scm2int (pb->paper_->c_variable ("max-systems-per-page"), 0));
min_systems_per_page_ = max (0, robust_scm2int (pb->paper_->c_variable ("min-systems-per-page"), 0));
+ orphan_penalty_ = robust_scm2int (pb->paper_->c_variable ("orphan-penalty"), 100000);
if (systems_per_page_ && (max_systems_per_page_ || min_systems_per_page_))
{
}
}
+void
+Page_breaking::compute_line_heights ()
+{
+ Real prev_hanging = 0;
+ Real prev_hanging_begin = 0;
+ Real prev_hanging_rest = 0;
+ for (vsize i = 0; i < cached_line_details_.size (); i++)
+ {
+ Line_shape shape = cached_line_details_[i].shape_;
+ Real a = shape.begin_[UP];
+ Real b = shape.rest_[UP];
+ Real midline_hanging = max (prev_hanging_begin + a, prev_hanging_rest + b);
+ Real hanging_begin = midline_hanging - shape.begin_[DOWN];
+ Real hanging_rest = midline_hanging - shape.rest_[DOWN];
+ Real hanging = max (hanging_begin, hanging_rest);
+ cached_line_details_[i].tallness_ = hanging - prev_hanging;
+ prev_hanging = hanging;
+ prev_hanging_begin = hanging_begin;
+ prev_hanging_rest = hanging_rest;
+ }
+}
+
vsize
Page_breaking::min_page_count (vsize configuration, vsize first_page_num)
{
int line_count = 0;
cache_line_details (configuration);
+ compute_line_heights ();
if (cached_line_details_.size ())
cur_page_height -= min_whitespace_at_top_of_page (cached_line_details_[0]);
for (vsize i = 0; i < cached_line_details_.size (); i++)
{
- Real ext_len = cached_line_details_[i].extent_.length ();
Real padding = 0;
+ Real ext_len;
if (cur_rod_height > 0)
- padding = cached_line_details_[i].title_ ?
- cached_line_details_[i-1].title_padding_ : cached_line_details_[i-1].padding_;
-
+ {
+ if (!cached_line_details_[i].tight_spacing_)
+ padding = (cached_line_details_[i].title_
+ ? cached_line_details_[i - 1].title_padding_
+ : cached_line_details_[i - 1].padding_);
+ ext_len = cached_line_details_[i].tallness_;
+ }
+ else
+ {
+ ext_len = cached_line_details_[i].full_height();
+ }
Real next_rod_height = cur_rod_height + ext_len + padding;
Real next_spring_height = cur_spring_height + cached_line_details_[i].space_;
Real next_height = next_rod_height + (ragged () ? next_spring_height : 0)
&& cached_line_details_[i-1].page_permission_ == ly_symbol2scm ("force")))
{
line_count = cached_line_details_[i].compressed_nontitle_lines_count_;
- cur_rod_height = ext_len;
+ cur_rod_height = cached_line_details_[i].full_height();
cur_spring_height = cached_line_details_[i].space_;
page_starter = i;
if (!too_few_lines (line_count - cached_line_details_.back ().compressed_nontitle_lines_count_)
&& cur_height > cur_page_height
/* don't increase the page count if the last page had only one system */
- && cur_rod_height > cached_line_details_.back ().extent_.length ())
+ && cur_rod_height > cached_line_details_.back ().full_height ())
ret++;
assert (ret <= cached_line_details_.size ());
// If systems_per_page_ is positive, we don't really try to space on N
// or N+1 pages; see the comment to space_systems_on_n_pages.
Page_spacing_result
-Page_breaking::space_systems_on_n_or_one_more_pages (vsize configuration, vsize n, vsize first_page_num)
+Page_breaking::space_systems_on_n_or_one_more_pages (vsize configuration, vsize n, vsize first_page_num,
+ Real penalty_for_fewer_pages)
{
Page_spacing_result n_res;
Page_spacing_result m_res;
m_res = finalize_spacing_result (configuration, m_res);
n_res = finalize_spacing_result (configuration, n_res);
- Real penalty = blank_page_penalty ();
- n_res.demerits_ += penalty;
+ Real page_spacing_weight = robust_scm2double (book_->paper_->c_variable ("page-spacing-weight"), 10);
+ n_res.demerits_ += penalty_for_fewer_pages * page_spacing_weight;
if (n_res.force_.size ())
- n_res.force_.back () += penalty;
+ n_res.force_.back () += penalty_for_fewer_pages;
return (m_res.demerits_ < n_res.demerits_) ? m_res : n_res;
}
Page_breaking::space_systems_on_best_pages (vsize configuration, vsize first_page_num)
{
vsize min_p_count = min_page_count (configuration, first_page_num);
- Real odd_pages_penalty = blank_page_penalty ();
cache_line_details (configuration);
Page_spacer ps (cached_line_details_, first_page_num, this);
Page_spacing_result best = ps.solve (min_p_count);
- best.force_.back () += (min_p_count % 2) ? odd_pages_penalty : 0;
- best.demerits_ += (min_p_count % 2) ? odd_pages_penalty : 0;
for (vsize i = min_p_count+1; i <= cached_line_details_.size (); i++)
{
Page_spacing_result cur = ps.solve (i);
- cur.demerits_ += (i % 2) ? odd_pages_penalty : 0;
if (cur.demerits_ < best.demerits_)
best = cur;
}
- return finalize_spacing_result (configuration, best);
+ Page_spacing_result ret = finalize_spacing_result (configuration, best);
+ return ret;
}
Page_spacing_result
Page_spacing space (page_height (first_page_num, false), this);
cache_line_details (configuration);
+ compute_line_heights ();
for (vsize line = 0; line < cached_line_details_.size (); line++)
{
Real prev_force = space.force_;
ly_symbol2scm ("padding"));
// FIXME: take into account the height of the header
- return max (0.0, max (padding, min_distance - line.extent_[UP]));
+ Real translate = max (line.shape_.begin_[UP], line.shape_.rest_[UP]);
+ return max (0.0, max (padding, min_distance - translate));
}
Real
ly_symbol2scm ("padding"));
// FIXME: take into account the height of the footer
- return max (0.0, max (padding, min_distance + line.extent_[DOWN]));
+ Real translate = min (line.shape_.begin_[DOWN], line.shape_.rest_[DOWN]);
+ return max (0.0, max (padding, min_distance + translate));
+}
+
+int
+Page_breaking::orphan_penalty () const
+{
+ return orphan_penalty_;
}
projects / lilypond.git / blobdiff