00001 00002 // 00003 // SFML - Simple and Fast Multimedia Library 00004 // Copyright (C) 2007 Laurent Gomila (laurent.gom@gmail.com) 00005 // 00006 // This software is provided 'as-is', without any express or implied warranty. 00007 // In no event will the authors be held liable for any damages arising from the use of this software. 00008 // 00009 // Permission is granted to anyone to use this software for any purpose, 00010 // including commercial applications, and to alter it and redistribute it freely, 00011 // subject to the following restrictions: 00012 // 00013 // 1. The origin of this software must not be misrepresented; 00014 // you must not claim that you wrote the original software. 00015 // If you use this software in a product, an acknowledgment 00016 // in the product documentation would be appreciated but is not required. 00017 // 00018 // 2. Altered source versions must be plainly marked as such, 00019 // and must not be misrepresented as being the original software. 00020 // 00021 // 3. This notice may not be removed or altered from any source distribution. 00022 // 00024 00026 // Headers 00028 #include <SFML/System/Randomizer.hpp> 00029 #include <cstdlib> 00030 #include <ctime> 00031 00032 00033 namespace 00034 { 00035 unsigned int SetRandomSeed() 00036 { 00037 unsigned int Seed = static_cast<unsigned int>(time(NULL)); 00038 srand(Seed); 00039 return Seed; 00040 } 00041 } 00042 00044 // Static member variables 00046 unsigned int sfRandomizer::ourSeed = SetRandomSeed(); 00047 00048 00053 void sfRandomizer::SetSeed(unsigned int Seed) 00054 { 00055 srand(Seed); 00056 ourSeed = Seed; 00057 } 00058 00059 00063 unsigned int sfRandomizer::GetSeed() 00064 { 00065 return ourSeed; 00066 } 00067 00068 00072 float sfRandomizer::Random(float Begin, float End) 00073 { 00074 // This is not the best algorithm, but it is fast and will be enough in most cases 00075 // (see Google for best approaches) 00076 00077 return static_cast<float>(rand()) / RAND_MAX * (End - Begin) + Begin; 00078 } 00079 00080 00084 int sfRandomizer::Random(int Begin, int End) 00085 { 00086 // This is not the best algorithm, but it is fast and will be enough in most cases 00087 // (see Google for best approaches) 00088 00089 return rand() % (End - Begin + 1) + Begin; 00090 }