Randomizer.cpp

 
//
// SFML - Simple and Fast Multimedia Library
// Copyright (C) 2007-2009 Laurent Gomila (laurent.gom@gmail.com)
//
// This software is provided 'as-is', without any express or implied warranty.
// In no event will the authors be held liable for any damages arising from the use of this software.
//
// Permission is granted to anyone to use this software for any purpose,
// including commercial applications, and to alter it and redistribute it freely,
// subject to the following restrictions:
//
// 1. The origin of this software must not be misrepresented;
//    you must not claim that you wrote the original software.
//    If you use this software in a product, an acknowledgment
//    in the product documentation would be appreciated but is not required.
//
// 2. Altered source versions must be plainly marked as such,
//    and must not be misrepresented as being the original software.
//
// 3. This notice may not be removed or altered from any source distribution.
//
 
// Headers
#include <SFML/System/Randomizer.hpp>
#include <stdlib.h>
#include <time.h>
 
 
namespace
{
    // Set the random numbers sequence seed with the current system time, so that it is always different
    unsigned int SetRandomSeed()
    {
        unsigned int Seed = static_cast<unsigned int>(time(NULL));
        srand(Seed);
        return Seed;
    }
}
 
 
namespace sf
{
// Static member variables
unsigned int Randomizer::ourSeed = SetRandomSeed();
 
 
void Randomizer::SetSeed(unsigned int Seed)
{
    srand(Seed);
    ourSeed = Seed;
}
 
 
unsigned int Randomizer::GetSeed()
{
    return ourSeed;
}
 
 
float Randomizer::Random(float Begin, float End)
{
    // This is not the best algorithm, but it is fast and will be enough in most cases
    // (see Google for best approaches)
 
    return static_cast<float>(rand()) / RAND_MAX * (End - Begin) + Begin;
}
 
 
int Randomizer::Random(int Begin, int End)
{
    // This is not the best algorithm, but it is fast and will be enough in most cases
    // (see Google for best approaches)
 
    return rand() % (End - Begin + 1) + Begin;
}
 
} // namespace sf