nevrax.org : docs

00001 
00006 /* Copyright, 2000, 2001, 2002 Nevrax Ltd.
00007  *
00008  * This file is part of NEVRAX NEL.
00009  * NEVRAX NEL is free software; you can redistribute it and/or modify
00010  * it under the terms of the GNU General Public License as published by
00011  * the Free Software Foundation; either version 2, or (at your option)
00012  * any later version.
00013 
00014  * NEVRAX NEL is distributed in the hope that it will be useful, but
00015  * WITHOUT ANY WARRANTY; without even the implied warranty of
00016  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
00017  * General Public License for more details.
00018 
00019  * You should have received a copy of the GNU General Public License
00020  * along with NEVRAX NEL; see the file COPYING. If not, write to the
00021  * Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
00022  * MA 02111-1307, USA.
00023  */
00024 
00025 #include "stdmisc.h"
00026 #include "nel/misc/random.h"
00027 
00028 namespace NLMISC
00029 {
00030 
00031 //===========================================================================
00032 CRandom::CRandom() : _Seed(1)
00033 {
00034 }
00035 
00036 //===========================================================================
00037 // NB : In fact this random generator has the same behaviour than the VC6 one
00038 sint32 CRandom::rand()
00039 {
00040         return ((_Seed = _Seed * 214013L + 2531011L) >> 16) & RandMax;  
00041 }
00042 
00043 //===========================================================================
00044 void CRandom::srand(sint32 seed)
00045 {
00046         _Seed = seed;
00047 }
00048 
00049 //===========================================================================
00050 float CRandom::frand(float mod)
00051 {
00052         double  r = (double) rand();
00053         r /= (double) RandMax;
00054         return (float)(r * mod);        
00055 }
00056 
00057 }
random.cpp
