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Random.h

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00001 //------------------------------------------------------------------------------
00002 // Lamp : Open source game middleware
00003 // Copyright (C) 2004  Junpei Ohtani ( Email : junpee@users.sourceforge.jp )
00004 //
00005 // This library is free software; you can redistribute it and/or
00006 // modify it under the terms of the GNU Lesser General Public
00007 // License as published by the Free Software Foundation; either
00008 // version 2.1 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 // Lesser General Public License for more details.
00014 //
00015 // You should have received a copy of the GNU Lesser General Public
00016 // License along with this library; if not, write to the Free Software
00017 // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
00018 //------------------------------------------------------------------------------
00019 
00020 /** @file
00021  * ランダムヘッダ
00022  * @author Junpee
00023  */
00024 
00025 #ifndef RANDOM_H_
00026 #define RANDOM_H_
00027 
00028 namespace Lamp{
00029 
00030 //------------------------------------------------------------------------------
00031 /**
00032  * ランダム
00033  *
00034  * このクラスは継承しないで下さい。
00035  */
00036 class Random{
00037 public:
00038     /**
00039      * コンストラクタ
00040      * @param initialSeed 初期化種
00041      */
00042     explicit Random(u_int initialSeed = 1){ setSeed(initialSeed); }
00043 
00044     /**
00045      * 種の設定
00046      * @param seed 設定する種
00047      */
00048     void setSeed(u_int seed){ seed_ = seed; }
00049 
00050     /**
00051      * ランダム値の取得
00052      * @return 0以上、Random::max以下のランダム値。
00053      */
00054     inline u_int get(){
00055         seed_ = 1664525 * seed_ + 1013904223;
00056         return seed_;
00057     }
00058 
00059     /**
00060      * byteランダム値の取得
00061      * @return 0以上、255以下のランダム値
00062      */
00063     inline int getByte(){
00064         return (get() & 0xff);
00065     }
00066 
00067     /**
00068      * floatランダム値の取得
00069      * @return -1.f以上、1.f未満のランダム値を返す
00070      */
00071     inline float getSignedFloat(){
00072         float result;
00073         (*(u_int*)&result) = 0x3f800000 | (0x7fffff & get());
00074         return (result * 2.f) - 3.f;
00075     }
00076 
00077     /**
00078      * unsigned floatランダム値の取得
00079      * @return 0.f以上、1.f未満のランダム値を返す
00080      */
00081     inline float getUnsignedFloat(){
00082         float result;
00083         (*(u_int*)&result) = 0x3f800000 | (0x7fffff & get());
00084         return result - 1.0f;
00085     }
00086 
00087 private:
00088     // コピーコンストラクタの隠蔽
00089     Random(const Random& copy);
00090 
00091     // 代入コピーの隠蔽
00092     void operator =(const Random& copy);
00093 
00094     // ランダムの種
00095     u_int seed_;
00096 };
00097 
00098 //------------------------------------------------------------------------------
00099 } // End of namespace Lamp
00100 #endif // End of RANDOM_H_
00101 //------------------------------------------------------------------------------

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