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NLMISC::CRandom Class Reference

#include <random.h>

Detailed Description

A simple, os-independant random generator.
Author:
Nicolas Vizerie

Nevrax France

Date:
2002

Definition at line 38 of file random.h.

Public Types

enum  { RandMax = 0x7fff }

Public Member Functions

 CRandom ()
float frand (double mod=1.0f)
float frandPlusMinus (double mod=1.0)
sint32 rand (uint16 mod)
sint32 rand ()
sint32 randPlusMinus (uint16 mod)
void srand (sint32 seed)

Private Attributes

sint32 _Seed

Member Enumeration Documentation

anonymous enum
 

Enumeration values:
RandMax 

Definition at line 42 of file random.h. 

00042 { RandMax = 0x7fff };

Constructor & Destructor Documentation

NLMISC::CRandom::CRandom (   )  [inline]
 

Definition at line 64 of file random.h. 

00064                         : _Seed(1)
00065 {
00066 }

Member Function Documentation

float NLMISC::CRandom::frand (  double  mod = 1.0f  )  [inline]
 

Definition at line 90 of file random.h.

References r, rand(), and RandMax.

Referenced by frandPlusMinus(). 

00091 {
00092         double  r = (double) rand();
00093         r /= (double) RandMax;
00094         return (float)(r * mod);        
00095 }

float NLMISC::CRandom::frandPlusMinus (  double  mod = 1.0  )  [inline]
 

Definition at line 98 of file random.h.

References frand(). 

00099 {
00100         return frand(2*mod)-(float)mod;
00101 }

sint32 NLMISC::CRandom::rand (  uint16  mod  )  [inline]
 

Definition at line 76 of file random.h.

References rand(), RandMax, sint32, and uint16. 

00077 {
00078         sint32 m=mod;
00079         return rand()*(m+1)/(sint32(RandMax)+1);
00080 }

sint32 NLMISC::CRandom::rand (   )  [inline]
 

Definition at line 70 of file random.h.

References _Seed, RandMax, and sint32.

Referenced by NL3D::CZoneLighter::attenuation(), frand(), rand(), and randPlusMinus(). 

00071 {
00072         return ((_Seed = _Seed * 214013L + 2531011L) >> 16) & RandMax;  
00073 }

sint32 NLMISC::CRandom::randPlusMinus (  uint16  mod  )  [inline]
 

Definition at line 83 of file random.h.

References rand(), RandMax, sint32, and uint16. 

00084 {
00085         sint32 m=mod;
00086         return m - rand()*(2*m+1)/(sint32(RandMax)+1);
00087 }

void NLMISC::CRandom::srand (  sint32  seed  )  [inline]
 

Definition at line 104 of file random.h.

References _Seed, and sint32. 

00105 {
00106         _Seed = seed;
00107 }

Field Documentation

sint32 NLMISC::CRandom::_Seed [private]
 

Definition at line 59 of file random.h.

Referenced by rand(), and srand().

The documentation for this class was generated from the following file:
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