Joe,
I'm trying to produce separate parts for an opera, using the combination
of page-turn-breaking and bookparts. This gives good results, however,
the page-turn page breaking algorithm adds blank pages at some places,
for instance, just before the last page of a bookpart, which gives an
awkward result:
_4_ _5_ _6_ _7_ _8_
|===||===| |===|| | |===| (then the beginning of the next part on
|===||===| |===|| | |===| the following odd page)
|===||===| |===|| | |===|
--- --- --- --- ---
whereas the following would be more pleasing:
_4_ _5_ _6_ _7_
|===||===| |===||===| (then the beginning of the next part on the
|===||===| |===||===| following even page, or possibly on the next
|===||===| |===||===| odd page after leaving a blank page)
--- --- --- ---
(pages 1 to 3 are in another bookpart, containing title page and
contents)
When patching the code as follows, the blank page is not added:
diff --git a/lily/page-turn-page-breaking.cc b/lily/page-turn-page-
breaking.cc
index e239cc2..665385b 100644
--- a/lily/page-turn-page-breaking.cc
+++ b/lily/page-turn-page-breaking.cc
@@ -125,12 +125,7 @@ Page_turn_page_breaking::calc_subproblem (vsize
ending_breakpoint)
int p_num = robust_scm2int (book_->paper_->c_variable ("first-
page-number"), 1);
if (start > 0)
{
- /* except possibly for the first page, enforce the fact that
first_page_number_
- should always be even (left hand page).
- TODO: are there different conventions in right-to-left languages?
- */
p_num = state_[start-1].first_page_number_ +
state_[start-1].page_count_;
- p_num += p_num % 2;
}
Line_division min_division;
@@ -252,10 +247,6 @@ Page_turn_page_breaking::make_pages
(vector<Break_node> const &soln, SCM systems
{
for (vsize j = 0; j < soln[i].page_count_; j++)
lines_per_page.push_back (soln[i].system_count_[j]);
-
- if (i + 1 < soln.size () && (soln[i].first_page_number_ +
soln[i].page_count_) % 2)
- /* add a blank page */
- lines_per_page.push_back (0);
}
/* this should only actually modify first-page-number if
But I imagine that this deleted code serves a good purpose.
Would it be reasonnable to add an option for not adding blank pages,
for instance a paper variable 'page-turn-breaking-no-blank-pages, to
avoid blank pages being added when the user does not want them?
Nicolas
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