CrystalSpace

Public API Reference

csutil/floatrand.h

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00001 /*
00002     Copyright (C) 2004 by Jorrit Tyberghein
00003     Copyright (C) 2005 by Eric Sunshine
00004 
00005     This library is free software; you can redistribute it and/or
00006     modify it under the terms of the GNU Library General Public
00007     License as published by the Free Software Foundation; either
00008     version 2 of the License, or (at your option) any later version.
00009 
00010     This library is distributed in the hope that it will be useful,
00011     but WITHOUT ANY WARRANTY; without even the implied warranty of
00012     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00013     Library General Public License for more details.
00014 
00015     You should have received a copy of the GNU Library General Public
00016     License along with this library; if not, write to the Free
00017     Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
00018 */
00019 
00020 #ifndef __CS_CSUTIL_FLOATRAND_H__
00021 #define __CS_CSUTIL_FLOATRAND_H__
00022 
00027 #include "csextern.h"
00028 
00032 class CS_CRYSTALSPACE_EXPORT csRandomFloatGen
00033 {
00034 private:
00035   unsigned int seed;
00036 
00037 public:
00039   csRandomFloatGen ()
00040   { Initialize(); }
00042   csRandomFloatGen (unsigned int seed)
00043   { Initialize(seed); }
00044 
00046   void Initialize();
00048   void Initialize(unsigned int new_seed)
00049   { seed = new_seed; }
00050 
00052   inline float Get()
00053   {
00054     unsigned int const b = 1664525;
00055     unsigned int const c = 1013904223;
00056     seed = b * seed + c;
00057     uint32 temp = 0x3f800000 | (0x007fffff & seed);
00058     return (*(float*)&temp) - 1.0;
00059   }
00060 
00062   inline float Get(float max)
00063   {
00064     return max * Get();
00065   }
00066 
00068   inline float Get(float min, float max)
00069   {
00070     float const w = max - min;
00071     return min + w * Get();
00072   }
00073 
00075   inline float GetAngle()
00076   {
00077     return TWO_PI * Get();
00078   }
00079 };
00080 
00081 #endif // __CS_CSUTIL_FLOATRAND_H__

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