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////////////////////////////////////////////////////////////
//
// SFML - Simple and Fast Multimedia Library
// Copyright (C) 2007-2008 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 <SFML/System/Platform.hpp>
#include <cstdlib>
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>(sf::priv::Platform::GetSystemTime() * 1000);
srand(Seed);
return Seed;
}
}
namespace sf
{
////////////////////////////////////////////////////////////
// Static member variables
////////////////////////////////////////////////////////////
unsigned int Randomizer::ourSeed = SetRandomSeed();
////////////////////////////////////////////////////////////
/// Set the seed for the generator. Using a known seed
/// allows you to reproduce the same sequence of random number
////////////////////////////////////////////////////////////
void Randomizer::SetSeed(unsigned int Seed)
{
srand(Seed);
ourSeed = Seed;
}
////////////////////////////////////////////////////////////
/// Get the seed used to generate random numbers the generator.
////////////////////////////////////////////////////////////
unsigned int Randomizer::GetSeed()
{
return ourSeed;
}
////////////////////////////////////////////////////////////
/// Get a random float number in a given range
////////////////////////////////////////////////////////////
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;
}
////////////////////////////////////////////////////////////
/// Get a random integer number in a given range
////////////////////////////////////////////////////////////
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
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