mirror of
https://port.numenaute.org/aleajactaest/khanat-code-old.git
synced 2024-12-02 00:06:00 +00:00
108 lines
2.9 KiB
C++
108 lines
2.9 KiB
C++
// NeL - MMORPG Framework <http://dev.ryzom.com/projects/nel/>
|
|
// Copyright (C) 2010 Winch Gate Property Limited
|
|
//
|
|
// This program is free software: you can redistribute it and/or modify
|
|
// it under the terms of the GNU Affero General Public License as
|
|
// published by the Free Software Foundation, either version 3 of the
|
|
// License, or (at your option) any later version.
|
|
//
|
|
// This program 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 Affero General Public License for more details.
|
|
//
|
|
// You should have received a copy of the GNU Affero General Public License
|
|
// along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
|
|
#ifndef NL_RANDOM_H
|
|
#define NL_RANDOM_H
|
|
|
|
#include "types_nl.h"
|
|
|
|
namespace NLMISC
|
|
{
|
|
|
|
/** A simple, os-independant random generator.
|
|
* \author Nicolas Vizerie
|
|
* \author Nevrax France
|
|
* \date 2002
|
|
*/
|
|
class CRandom
|
|
{
|
|
public:
|
|
// The max value that can be returned by the random generator
|
|
enum { RandMax = 0x7fff };
|
|
public:
|
|
// ctor
|
|
inline CRandom();
|
|
// generate a random value in [0, RandMax]
|
|
inline sint32 rand();
|
|
// generate a random value in [0, mod]
|
|
inline sint32 rand(uint16 mod);
|
|
// generate a floating point random value in [0, mod]
|
|
inline float frand(double mod=1.0f);
|
|
// generate a random value in [-mod, mod]
|
|
inline sint32 randPlusMinus(uint16 mod);
|
|
// generate a random value in [-mod, mod]
|
|
inline float frandPlusMinus(double mod=1.0);
|
|
// set a new seed for the random generator
|
|
inline void srand(sint32 seed);
|
|
private:
|
|
sint32 _Seed;
|
|
};
|
|
|
|
|
|
//===========================================================================
|
|
inline CRandom::CRandom() : _Seed(1)
|
|
{
|
|
}
|
|
|
|
//===========================================================================
|
|
// NB : In fact this random generator has the same behaviour than the VC6 one
|
|
inline sint32 CRandom::rand()
|
|
{
|
|
return ((_Seed = _Seed * 214013L + 2531011L) >> 16) & RandMax;
|
|
}
|
|
|
|
//===========================================================================
|
|
inline sint32 CRandom::rand(uint16 mod)
|
|
{
|
|
sint32 m=mod;
|
|
return rand()*(m+1)/(sint32(RandMax)+1);
|
|
}
|
|
|
|
//===========================================================================
|
|
inline sint32 CRandom::randPlusMinus(uint16 mod)
|
|
{
|
|
sint32 m=mod;
|
|
return m - rand()*(2*m+1)/(sint32(RandMax)+1);
|
|
}
|
|
|
|
//===========================================================================
|
|
inline float CRandom::frand(double mod)
|
|
{
|
|
double r = (double) rand();
|
|
r /= (double) RandMax;
|
|
return (float)(r * mod);
|
|
}
|
|
|
|
//===========================================================================
|
|
inline float CRandom::frandPlusMinus(double mod)
|
|
{
|
|
return frand(2*mod)-(float)mod;
|
|
}
|
|
|
|
//===========================================================================
|
|
inline void CRandom::srand(sint32 seed)
|
|
{
|
|
_Seed = seed;
|
|
}
|
|
|
|
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
|