+ Grob *common = me->common_refpoint (staff, Y_AXIS);
+ Real my_off = me->get_parent (Y_AXIS)->maybe_pure_coordinate (common, Y_AXIS, pure, start, end);
+ Real staff_off = staff->maybe_pure_coordinate (common, Y_AXIS, pure, start, end);
+ Real ss = Staff_symbol::staff_space (staff);
+ Real position = 2 * (my_off + o - staff_off) / ss;
+ Real rounded = directed_round (position, dir);
+ Grob *head = me->get_parent (X_AXIS);
+
+ if (fabs (position) <= 2 * Staff_symbol_referencer::staff_radius (me) + 1
+ || (Note_head::has_interface (head)
+ && sign (Staff_symbol_referencer::get_position (head)) == - dir))
+ {
+ o += (rounded - position) * 0.5 * ss;
+ if (Staff_symbol_referencer::on_line (me, int (rounded)))
+ o += dir * 0.5 * ss;
+ }