Randomizer.cpp
00001 00002 // 00003 // SFML - Simple and Fast Multimedia Library 00004 // Copyright (C) 2007-2009 Laurent Gomila ([email protected]) 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 <stdlib.h> 00030 #include <time.h> 00031 00032 00033 namespace 00034 { 00035 // Set the random numbers sequence seed with the current system time, so that it is always different 00036 unsigned int SetRandomSeed() 00037 { 00038 unsigned int Seed = static_cast<unsigned int>(time(NULL)); 00039 srand(Seed); 00040 return Seed; 00041 } 00042 } 00043 00044 00045 namespace sf 00046 { 00048 // Static member variables 00050 unsigned int Randomizer::ourSeed = SetRandomSeed(); 00051 00052 00057 void Randomizer::SetSeed(unsigned int Seed) 00058 { 00059 srand(Seed); 00060 ourSeed = Seed; 00061 } 00062 00063 00067 unsigned int Randomizer::GetSeed() 00068 { 00069 return ourSeed; 00070 } 00071 00072 00076 float Randomizer::Random(float Begin, float End) 00077 { 00078 // This is not the best algorithm, but it is fast and will be enough in most cases 00079 // (see Google for best approaches) 00080 00081 return static_cast<float>(rand()) / RAND_MAX * (End - Begin) + Begin; 00082 } 00083 00084 00088 int Randomizer::Random(int Begin, int End) 00089 { 00090 // This is not the best algorithm, but it is fast and will be enough in most cases 00091 // (see Google for best approaches) 00092 00093 return rand() % (End - Begin + 1) + Begin; 00094 } 00095 00096 } // namespace sf
:: Copyright © 2007-2008 Laurent Gomila, all rights reserved :: Documentation generated by doxygen 1.5.2 ::