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randomizer.h
00001 // Filename: randomizer.h
00002 // Created by:  drose (18Jan07)
00003 //
00004 ////////////////////////////////////////////////////////////////////
00005 //
00006 // PANDA 3D SOFTWARE
00007 // Copyright (c) Carnegie Mellon University.  All rights reserved.
00008 //
00009 // All use of this software is subject to the terms of the revised BSD
00010 // license.  You should have received a copy of this license along
00011 // with this source code in a file named "LICENSE."
00012 //
00013 ////////////////////////////////////////////////////////////////////
00014 
00015 #ifndef RANDOMIZER_H
00016 #define RANDOMIZER_H
00017 
00018 #include "pandabase.h"
00019 #include "mersenne.h"
00020 
00021 #include <time.h>
00022 
00023 ////////////////////////////////////////////////////////////////////
00024 //       Class : Randomizer
00025 // Description : A handy class to return random numbers.
00026 ////////////////////////////////////////////////////////////////////
00027 class EXPCL_PANDA_MATHUTIL Randomizer {
00028 PUBLISHED:
00029   INLINE Randomizer(unsigned long seed = 0);
00030   INLINE Randomizer(const Randomizer &copy);
00031   INLINE void operator = (const Randomizer &copy);
00032 
00033   INLINE int random_int(int range);
00034   INLINE double random_real(double range);
00035   INLINE double random_real_unit();
00036 
00037   INLINE static unsigned long get_next_seed();
00038   INLINE unsigned long get_seed();
00039 
00040 private:
00041   Mersenne _mersenne;
00042   static Mersenne _next_seed;
00043   static bool _got_first_seed;
00044 };
00045 
00046 #include "randomizer.I"
00047 
00048 #endif
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