/*
   math/functions.cc
   This file is part of the Osirion project and is distributed under
   the terms of the GNU General Public License version 2
*/

#include "math/functions.h"
#include <stdlib.h>

namespace math
{

const float DELTA = 10e-10;

float min(float a, float b)
{
	return (a < b ? a : b);
}

float max(float a, float b)
{
	return (a > b ? a : b);
}

int min(int a, int b)
{
	return (a < b ? a : b);
}

int max(int a, int b)
{
	return (a > b ? a : b);
}

float randomf(const float max)
{
	return ((float) rand() / (float) RAND_MAX) * max;
}

unsigned randomi(const unsigned int max)
{
	return ((unsigned int)(rand() % max));
}

float degrees180f(float angle)
{
	float r = angle;
	while (r - DELTA < -180.0f)
		r += 360.0f;
	while (r + DELTA > 180.0f)
		r -= 360.0f;
	return r;
}

float degrees360f(float angle)
{
	float r = angle;
	while (r - DELTA < 0)
		r += 360.0f;
	while (r + DELTA > 360.0f)
		r -= 360.0f;
	return r;
}

float sgnf(float value)
{
	if (value < 0)
		return -1;
	else if (value == 0)
		return 0;
		
	return 1;
}

} // namespace math