Support retrieving distribution parameters

libs/pcg/include/psemek/pcg/random/box.hpp

@@ -2,7 +2,7 @@
 
 #include <psemek/geom/point.hpp>
 #include <psemek/geom/box.hpp>
-#include <psemek/pcg/random/uniform_real.hpp>
+#include <psemek/pcg/random/uniform.hpp>
 
 namespace psemek::pcg
 {
@@ -10,13 +10,13 @@ namespace psemek::pcg
 	template <typename T, std::size_t N>
 	struct box_point_distribution
 	{
-		uniform_real_distribution<T> d[N];
+		using result_type = geom::point<T, N>;
 
 		box_point_distribution(geom::box<T, N> const & b)
 		{
 			for (std::size_t i = 0; i < N; ++i)
 			{
-				d[i] = uniform_real_distribution<T>{b[i]};
+				d_[i] = uniform_distribution<T>{b[i]};
 			}
 		}
 
@@ -27,9 +27,20 @@ namespace psemek::pcg
 		{
 			geom::point<T, N> p;
 			for (std::size_t i = 0; i < N; ++i)
-				p[i] = d[i](rng);
+				p[i] = d_[i](rng);
 			return p;
 		}
+
+		geom::box<T, N> box() const
+		{
+			geom::box<T, N> result;
+			for (std::size_t i = 0; i < N; ++i)
+				result[i] = d_[i].range();
+			return result;
+		}
+
+	private:
+		uniform_distribution<T> d_[N];
 	};
 
 }

libs/pcg/include/psemek/pcg/random/normal.hpp

@@ -31,6 +31,10 @@ namespace psemek::pcg
 		template <typename RNG>
 		T operator()(RNG && rng);
 
+		T mean() const { return mean_; }
+
+		T stddev() const { return stddev_; }
+
 	private:
 		T mean_;
 		T stddev_;

libs/pcg/include/psemek/pcg/random/uniform_int.hpp

@@ -32,6 +32,8 @@ namespace psemek::pcg
 		template <typename RNG>
 		T operator()(RNG && rng);
 
+		geom::interval<T> range() const { return range_; }
+
 	private:
 		geom::interval<T> range_;
 

libs/pcg/include/psemek/pcg/random/uniform_real.hpp

@@ -32,6 +32,8 @@ namespace psemek::pcg
 		template <typename RNG>
 		T operator()(RNG && rng);
 
+		geom::interval<T> range() const { return range_; }
+
 	private:
 		geom::interval<T> range_;
 

libs/pcg/include/psemek/pcg/random/uniform_sphere.hpp

@@ -35,6 +35,8 @@ namespace psemek::pcg
 			}
 		}
 
+		T radius() const { return r_; }
+
 	private:
 		normal_distribution<T> d_;
 		T r_;
@@ -60,6 +62,8 @@ namespace psemek::pcg
 			return {-r_};
 		}
 
+		T radius() const { return r_; }
+
 	private:
 		T r_;
 	};
@@ -83,6 +87,8 @@ namespace psemek::pcg
 			return r_ * result_type{std::cos(a), std::sin(a)};
 		}
 
+		T radius() const { return r_; }
+
 	private:
 		T r_;
 	};
@@ -116,6 +122,8 @@ namespace psemek::pcg
 			}
 		}
 
+		T radius() const { return r_; }
+
 	private:
 		T r_;
 	};
@@ -136,6 +144,10 @@ namespace psemek::pcg
 			return origin_ + vector_d_(rng);
 		}
 
+		result_type origin() const { return origin_; }
+
+		T radius() const { return vector_d_.radius(); }
+
 	private:
 		result_type origin_;
 		uniform_sphere_vector_distribution<T, N> vector_d_;