Add interval::center & box::center

libs/geom/include/psemek/geom/box.hpp

@@ -49,6 +49,14 @@ namespace psemek::geom
 			return result;
 		}
 
+		point_type center() const
+		{
+			point_type p;
+			for (std::size_t i = 0; i < N; ++i)
+				p[i] = axes[i].center();
+			return p;
+		}
+
 		box & operator += (vector_type const & delta);
 		box & operator -= (vector_type const & delta);
 

libs/geom/include/psemek/geom/interval.hpp

@@ -89,6 +89,11 @@ namespace psemek::geom
 			return empty() ? T{} : max - min;
 		}
 
+		T center() const
+		{
+			return min + (max - min) / 2;
+		}
+
 		using iterator = interval_iterator<T>;
 		using const_iterator = iterator;