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Copy pathRNG.cpp
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62 lines (58 loc) · 1.54 KB
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/*
* Copyright 2010 Daniel Albano
*
* This file is part of OpenXcom.
*
* OpenXcom is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* OpenXcom is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with OpenXcom. If not, see <http://www.gnu.org/licenses/>.
*/
#include "RNG.h"
#include <cstdlib>
#include <ctime>
/**
* Defaults to the current time.
*/
int RNG::seed = (int)time(NULL);
/**
* Seeds the random generator with a new number.
* @param seed New seed. Defaults to existing seed if none is set.
*/
void RNG::init(int seed)
{
if (seed == -1)
srand(RNG::seed);
else
srand(seed);
}
/**
* Generates a random integer number within a certain range.
* @param min Minimum number.
* @param max Maximum number.
* @return Generated number.
*/
int RNG::generate(int min, int max)
{
seed = rand();
return (seed % (max - min + 1) + min);
}
/**
* Generates a random decimal number within a certain range.
* @param min Minimum number.
* @param max Maximum number.
* @return Generated number.
*/
double RNG::generate(double min, double max)
{
seed = rand();
return (seed * (max - min) / RAND_MAX + min);
}