Randomizer.cpp

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 }