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112 lines
3.3 KiB
C++
112 lines
3.3 KiB
C++
// ==============================================================
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// This file is part of MegaGlest Shared Library (www.megaglest.org)
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//
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// Copyright (C) 2012 Mark Vejvoda, Titus Tscharntke
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// 2001-2008 Martiño Figueroa
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//
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// You can redistribute this code and/or modify it under
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// the terms of the GNU General Public License as published
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// by the Free Software Foundation; either version 2 of the
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// License, or (at your option) any later version
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// ==============================================================
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#include "randomgen.h"
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#include <cassert>
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#include "util.h"
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#include <stdexcept>
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#include "platform_util.h"
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#include "math_util.h"
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#include "leak_dumper.h"
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using namespace std;
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using namespace Shared::Graphics;
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namespace Shared {
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namespace Util {
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// =====================================================
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// class RandomGen
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// =====================================================
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const int RandomGen::m = 714025;
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const int RandomGen::a = 1366;
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const int RandomGen::b = 150889;
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RandomGen::RandomGen() {
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lastNumber = 0;
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disableLastCallerTracking = false;
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}
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void RandomGen::init(int seed) {
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lastNumber = seed % m;
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}
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int RandomGen::rand(string lastCaller) {
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if (lastCaller != "") {
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this->lastCaller.push_back(lastCaller);
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}
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this->lastNumber = (a*lastNumber + b) % m;
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return lastNumber;
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}
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std::string RandomGen::getLastCaller() const {
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std::string result = "";
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if (lastCaller.empty() == false) {
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for (unsigned int index = 0; index < lastCaller.size(); ++index) {
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result += lastCaller[index] + "|";
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}
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}
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return result;
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}
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void RandomGen::clearLastCaller() {
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if (lastCaller.empty() == false) {
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lastCaller.clear();
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}
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}
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void RandomGen::addLastCaller(std::string text) {
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if (disableLastCallerTracking == false) {
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lastCaller.push_back(text);
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}
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}
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int RandomGen::randRange(int min, int max, string lastCaller) {
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if (min > max) {
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char szBuf[8096] = "";
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snprintf(szBuf, 8096, "In [%s::%s Line: %d] min > max, min = %d, max = %d", __FILE__, __FUNCTION__, __LINE__, min, max);
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throw megaglest_runtime_error(szBuf);
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}
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int diff = max - min;
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float numerator = static_cast<float>(diff + 1) * static_cast<float>(this->rand(lastCaller));
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int res = min + static_cast<int>(truncateDecimal<float>(numerator / static_cast<float>(m), 6));
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if (res < min || res > max) {
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char szBuf[8096] = "";
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snprintf(szBuf, 8096, "In [%s::%s Line: %d] res < min || res > max, min = %d, max = %d, res = %d", __FILE__, __FUNCTION__, __LINE__, min, max, res);
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throw megaglest_runtime_error(szBuf);
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}
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return res;
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}
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float RandomGen::randRange(float min, float max, string lastCaller) {
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if (min > max) {
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char szBuf[8096] = "";
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snprintf(szBuf, 8096, "In [%s::%s Line: %d] min > max, min = %f, max = %f", __FILE__, __FUNCTION__, __LINE__, min, max);
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throw megaglest_runtime_error(szBuf);
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}
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float rand01 = static_cast<float>(this->rand(lastCaller)) / (m - 1);
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float res = min + (max - min) * rand01;
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res = truncateDecimal<float>(res, 6);
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if (res < min || res > max) {
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char szBuf[8096] = "";
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snprintf(szBuf, 8096, "In [%s::%s Line: %d] res < min || res > max, min = %f, max = %f, res = %f", __FILE__, __FUNCTION__, __LINE__, min, max, res);
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throw megaglest_runtime_error(szBuf);
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}
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return res;
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}
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}
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}//end namespace
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