+ /*
+ Rests and notes.
+ */
+ if (rests.size () > 1)
+ warning (_ ("too many colliding rests"));
+ Grob *rcol = 0;
+ Direction dir = CENTER;
+
+ for (vsize i = rests.size (); !rcol && i--;)
+ if (Note_column::dir (rests[i]))
+ {
+ rcol = rests[i];
+ dir = Note_column::dir (rcol);
+ }
+
+ if (!rcol)
+ return SCM_BOOL_T;
+
+ Grob *rest = Note_column::get_rest (rcol);
+ Grob *common = common_refpoint_of_array (notes, rcol, Y_AXIS);
+
+ Interval restdim = rcol->extent (common, Y_AXIS);
+ if (restdim.is_empty ())
+ return SCM_BOOL_T;
+
+ Real staff_space = Staff_symbol_referencer::staff_space (rcol);
+ Real minimum_dist = robust_scm2double (me->get_property ("minimum-distance"), 1.0) * staff_space;
+
+ Interval notedim;
+ for (vsize i = 0; i < notes.size (); i++)
+ notedim.unite (notes[i]->extent (common, Y_AXIS));
+
+
+ Real y = dir * max (0.0,
+ -dir * restdim[-dir] + dir * notedim[dir] + minimum_dist);
+
+ int stafflines = Staff_symbol_referencer::line_count (me);
+ if (!stafflines)
+ {
+ programming_error ("no staff line count");
+ stafflines = 5;
+ }
+
+ // move discretely by half spaces.
+ int discrete_y = dir * int (ceil (y / (0.5 * dir * staff_space)));
+
+ // move by whole spaces inside the staff.
+ if (fabs (Staff_symbol_referencer::get_position (rest)
+ + discrete_y) < stafflines + 1)
+ {
+ discrete_y = dir * int (ceil (dir * discrete_y / 2.0) * 2.0);
+ }
+
+ Note_column::translate_rests (rcol, discrete_y);