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random.cpp

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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 }
+
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