+ Graphical_axis_group::set_axes (a1,a2);
+ set_empty (a1 != X_AXIS && a2 != X_AXIS, X_AXIS);
+ set_empty (a1 != Y_AXIS && a2 != Y_AXIS, Y_AXIS);
+}
+
+
+void
+Axis_group_element::do_substitute_element_pointer (Score_element*o,
+ Score_element*n)
+{
+ int i;
+ Graphical_element * go = o;
+ Graphical_element * gn = n;
+
+ while ((i = elem_l_arr_.find_i (go))>=0)
+ elem_l_arr_.substitute (go,gn);
+
+ extra_elems_.substitute (o, n);
+}
+
+Interval
+Axis_group_element::extra_extent (Axis a )const
+{
+ Interval g;
+ Axis_group_element* urg = (Axis_group_element*)this;
+ urg->purge_extra (); // Yeah yeah, const correctness.
+ for (int i=0; i < extra_elems_.size (); i++)
+ {
+ Interval ge = extra_elems_[i]->relative_coordinate (this, a)
+ + extra_elems_[i]->extent (a);
+ g.unite (ge);
+ }
+ return g;
+}
+
+Interval
+Axis_group_element::do_height () const
+{
+ Interval gag = Graphical_axis_group::extent (Y_AXIS);
+ gag.unite (extra_extent (Y_AXIS));
+ return gag;
+}
+
+Interval
+Axis_group_element::do_width () const
+{
+ Interval gag = Graphical_axis_group::extent (X_AXIS);
+ gag.unite (extra_extent (X_AXIS));
+ return gag;