Approximates cross-staff slurs in VerticalAxisGroup vertical-skylines.

lily/slur-configuration.cc

 /*
   This file is part of LilyPond, the GNU music typesetter.
 
   Copyright (C) 2004--2012 Han-Wen Nienhuys <hanwen@xs4all.nl>
 
   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.
 
@@ skipping 29 matching lines @@
 
   /* TODO: handle case of broken slur.  */
   if (!ts.empty ()
       && (state.extremes_[LEFT].staff_ == state.extremes_[RIGHT].staff_)
       && state.extremes_[LEFT].staff_ && state.extremes_[RIGHT].staff_)
     {
       Real y = bez.curve_point (ts[0])[Y_AXIS];
 
       Grob *staff = state.extremes_[LEFT].staff_;
 
-      Real p = 2 * (y - staff->maybe_pure_coordinate (state.common_[Y_AXIS], Y_AXIS, state.stub_, 0, INT_MAX))
+      Real p = 2 * (y - staff->maybe_pure_coordinate (state.common_[Y_AXIS], Y_AXIS, state.stub_, state.spanned_rank_interval_[LEFT], state.spanned_rank_interval_[RIGHT]))
                / state.staff_space_;
 
       Real const round = my_round (p);
       Real const frac = p - round;
       if (fabs (frac) < 4 * state.thickness_
           && Staff_symbol_referencer::on_staff_line (staff, int (round)))
         {
           Direction resolution_dir = frac ? state.dir_ : CENTER;
 
           // TODO: parameter
@@ skipping 470 matching lines @@
 
 Slur_configuration *
 Slur_configuration::new_config (Drul_array<Offset> const &offs, int idx)
 {
   Slur_configuration *conf = new Slur_configuration;
   conf->attachment_ = offs;
   conf->index_ = idx;
   conf->next_scorer_todo = INITIAL_SCORE + 1;
   return conf;
 }