Doc-es: various updates.

[lilypond.git] / lily / one-line-page-breaking.cc

diff --git a/lily/one-line-page-breaking.cc b/lily/one-line-page-breaking.cc
index 2175e1727a48658de49819109dab82acf92f8c9e..a3276f4216c6b876274f8def526188ebaf60a733 100644 (file)
--- a/lily/one-line-page-breaking.cc
+++ b/lily/one-line-page-breaking.cc
@@ -40,42 +40,52 @@ One_line_page_breaking::~One_line_page_breaking ()
 }
 
 /*
-  This is a somewhat unconventional page-breaking algorithm. Every
-  score will be put on a single page, whose width is enough
-  to fit the entire score one one line. Line breaks and page breaks
-  are ignored, as are the page dimensions in the paper block.
+  This is a somewhat unconventional page-breaking algorithm.  Every
+  score is put on a single page, whose width is enough to fit the entire
+  score on one line.  Line breaks and page breaks are ignored, and the
+  paper-width setting in the paper block is modified to fit the music.
 */
 SCM
 One_line_page_breaking::solve ()
 {
   SCM all_pages = SCM_EOL;
+  Real max_width = 0;
   for (vsize i = 0; i < system_specs_.size (); ++i)
-    if (Paper_score *ps = system_specs_[i].pscore_)
-      {
-        vector<Grob*> cols = ps->root_system ()->used_columns ();
-
-        // No indent, "infinite" line width, ragged.
-        Column_x_positions pos = get_line_configuration (cols, numeric_limits<Real>::max (), 0, true);
-        vector<Column_x_positions> positions;
-        positions.push_back (pos);
-
-        ps->root_system ()->break_into_pieces (positions);
-        ps->root_system ()->do_break_substitution_and_fixup_refpoints ();
-        Grob *system = ps->root_system ()->broken_intos_[0];
-        Real width = system->extent (system, X_AXIS).length ();
-        Real height = system->extent (system, Y_AXIS).length ();
-        
-        // HACK: probably shouldn't be modifying the paper_; better to modify the page
-        // afterwards.
-        book_->paper_->set_variable (ly_symbol2scm ("paper-width"), scm_from_double (width + 100));
-        // TODO: figure out what the height should be.
-        //book_->paper_->set_variable (ly_symbol2scm ("paper-height"), scm_from_double (height));
-        vector<vsize> lines_per_page;
-        lines_per_page.push_back (1);
-        SCM systems = scm_list_1 (system->self_scm ());
-        SCM pages = make_pages (lines_per_page, systems);
-        all_pages = scm_cons (scm_car (pages), all_pages);
-      }
+    {
+      if (Paper_score *ps = system_specs_[i].pscore_)
+        {
+          vector<Grob *> cols = ps->root_system ()->used_columns ();
+
+          // No indent, "infinite" line width, ragged.
+          Column_x_positions pos = get_line_configuration (cols, numeric_limits<Real>::max (), 0, true);
+          vector<Column_x_positions> positions;
+          positions.push_back (pos);
+
+          ps->root_system ()->break_into_pieces (positions);
+          ps->root_system ()->do_break_substitution_and_fixup_refpoints ();
+          Grob *system = ps->root_system ()->broken_intos_[0];
+
+          vector<vsize> lines_per_page;
+          lines_per_page.push_back (1);
+          SCM systems = scm_list_1 (system->self_scm ());
+          SCM pages = make_pages (lines_per_page, systems);
+
+          max_width = max (max_width, system->extent (system, X_AXIS).length ());
+          all_pages = scm_cons (scm_car (pages), all_pages);
+        }
+      else if (Prob *pb = system_specs_[i].prob_)
+        // Because we don't call Page_breaking::systems in this algorithm,
+        // we need to manually unprotect the titles.
+        pb->unprotect ();
+    }
+
+  // Alter paper-width so that it is large enough to fit every system.
+  // TODO: it might be nice to allow different pages to have different widths.
+  // This would need support in the backends (eg. framework-ps.scm).
+  Real right_margin = robust_scm2double (book_->paper_->c_variable ("right-margin"), 0.0);
+  Real left_margin = robust_scm2double (book_->paper_->c_variable ("left-margin"), 0.0);
+  Real width = max_width + right_margin + left_margin;
+  book_->paper_->set_variable (ly_symbol2scm ("paper-width"), scm_from_double (width));
 
   return scm_reverse_x (all_pages, SCM_EOL);
 }