+ pscore_ = ps;
+ initialize ();
+}
+
+/* find the forces for all possible lines and cache ragged_ and ragged_right_ */
+void
+Constrained_breaking::initialize ()
+{
+ if (!pscore_)
+ return;
+
+ ragged_right_ = to_boolean (pscore_->layout ()->c_variable ("ragged-right"));
+ ragged_last_ = to_boolean (pscore_->layout ()->c_variable ("ragged-last"));
+
+ Output_def *l = pscore_->layout ();
+ System *sys = pscore_->root_system ();
+ Real space = robust_scm2double (l->c_variable ("ideal-system-space"), 0);
+ SCM padding_scm = l->c_variable ("page-breaking-between-system-padding");
+ if (!scm_is_number (padding_scm))
+ padding_scm = l->c_variable ("between-system-padding");
+ Real padding = robust_scm2double (padding_scm, 0.0);
+
+ Interval first_line = line_dimensions_int (pscore_->layout (), 0);
+ Interval other_lines = line_dimensions_int (pscore_->layout (), 1);
+ /* do all the rod/spring problems */
+ breaks_ = pscore_->find_break_indices ();
+ all_ = pscore_->root_system ()->used_columns ();
+ lines_.resize (breaks_.size (), breaks_.size (), Line_details ());
+ vector<Real> forces = get_line_forces (all_,
+ other_lines.length (),
+ other_lines.length () - first_line.length (),
+ ragged_right_);
+ for (vsize i = 0; i + 1 < breaks_.size (); i++)
+ {
+ Real max_ext = 0;
+ for (vsize j = i + 1; j < breaks_.size (); j++)
+ {
+ int start = Paper_column::get_rank (all_[breaks_[i]]);
+ int end = Paper_column::get_rank (all_[breaks_[j]]);
+ Interval extent = sys->pure_height (sys, start, end);
+ bool last = j == breaks_.size () - 1;
+ bool ragged = ragged_right_ || (last && ragged_last_);
+ Line_details &line = lines_.at (j, i);
+
+ line.force_ = forces[i*breaks_.size () + j];
+ if (ragged && last && !isinf (line.force_))
+ line.force_ = 0;
+ if (isinf (line.force_))
+ break;
+
+ Grob *c = all_[breaks_[j]];
+ line.break_penalty_ = robust_scm2double (c->get_property ("line-break-penalty"), 0);
+ line.page_penalty_ = robust_scm2double (c->get_property ("page-break-penalty"), 0);
+ line.turn_penalty_ = robust_scm2double (c->get_property ("page-turn-penalty"), 0);
+ line.break_permission_ = c->get_property ("line-break-permission");
+ line.page_permission_ = c->get_property ("page-break-permission");
+ line.turn_permission_ = c->get_property ("page-turn-permission");
+
+ max_ext = max (max_ext, extent.length ());
+ line.extent_ = extent;
+ line.padding_ = padding;
+ line.space_ = space;
+ line.inverse_hooke_ = extent.length () + space;
+ }
+ }
+
+ /* work out all the starting indices */
+ for (vsize i = 0; i < start_.size (); i++)
+ {
+ vsize j;
+ for (j = 0; j + 1 < breaks_.size () && breaks_[j] < start_[i]; j++)
+ ;
+ starting_breakpoints_.push_back (j);
+ start_[i] = breaks_[j];
+ }
+ state_.resize (start_.size ());