/*
  nsmc --- n-sphere Monte Carlo method
  Copyright © 2021 Arun I <arunisaac@systemreboot.net>
  Copyright © 2021 Murugesan Venkatapathi <murugesh@iisc.ac.in>

  This file is part of nsmc.

  nsmc is free software: you can redistribute it and/or modify it
  under the terms of the GNU General Public License as published by
  the Free Software Foundation, either version 3 of the License, or
  (at your option) any later version.

  nsmc is distributed in the hope that it will be useful, but
  WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with nsmc.  If not, see <https://www.gnu.org/licenses/>.
*/

#ifndef ND_RANDOM_H
#define ND_RANDOM_H

#include <gsl/gsl_integration.h>
#include <gsl/gsl_rng.h>
#include <gsl/gsl_vector.h>

void random_direction_vector (const gsl_rng* r, gsl_vector* x);
void random_vector_in_sphere (const gsl_rng* r, double radius, gsl_vector* x);
void cone_random_vector (const gsl_rng* r, const gsl_vector* mean, double theta_max, gsl_vector* x);
void hollow_cone_random_vector (const gsl_rng* r, const gsl_vector* mean, double theta_min, double theta_max, gsl_vector* x);

double planar_angle_to_solid_angle_fraction (double planar_angle, unsigned int dimension);
double solid_angle_fraction_to_planar_angle (double solid_angle, unsigned int dimension);

#endif