csutil/floatrand.h
Go to the documentation of this file.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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