/* * The ManaPlus Client * Copyright (C) 2006-2009 The Mana World Development Team * Copyright (C) 2009-2010 The Mana Developers * Copyright (C) 2011-2016 The ManaPlus Developers * * This file is part of The ManaPlus Client. * * This program 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 2 of the License, or * any later version. * * This program 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 this program. If not, see <http://www.gnu.org/licenses/>. */ #ifndef PARTICLE_PARTICLEEMITTERPROP_H #define PARTICLE_PARTICLEEMITTERPROP_H #include <cmath> #include "enums/particle/particlechangefunc.h" #include "localconsts.h" template <typename T> struct ParticleEmitterProp final { ParticleEmitterProp() : minVal(0), maxVal(0), changeFunc(ParticleChangeFunc::FUNC_NONE), changeAmplitude(0), changePeriod(0), changePhase(0) { } void set(const T min, const T max) { minVal = min; maxVal = max; } void set(const T val) { set(val, val); } void setFunction(ParticleChangeFuncT func, T amplitude, const int period, const int phase) { changeFunc = func; changeAmplitude = amplitude; changePeriod = period; if (!changePeriod) changePeriod = 1; changePhase = phase; } T value(int tick) const { tick += changePhase; T val = static_cast<T>(minVal + (maxVal - minVal) * (rand() / (static_cast<double>(RAND_MAX) + 1))); switch (changeFunc) { case ParticleChangeFunc::FUNC_SINE: val += static_cast<T>(std::sin(M_PI * 2 * (static_cast<double>( tick % changePeriod) / static_cast<double>( changePeriod)))) * changeAmplitude; break; case ParticleChangeFunc::FUNC_SAW: val += static_cast<T>(changeAmplitude * (static_cast<double>( tick % changePeriod) / static_cast<double>( changePeriod))) * 2 - changeAmplitude; break; case ParticleChangeFunc::FUNC_TRIANGLE: if ((tick % changePeriod) * 2 < changePeriod) { val += changeAmplitude - static_cast<T>(( tick % changePeriod) / static_cast<double>( changePeriod)) * changeAmplitude * 4; } else { val += changeAmplitude * -3 + static_cast<T>(( tick % changePeriod) / static_cast<double>( changePeriod)) * changeAmplitude * 4; // I have no idea why this works but it does } break; case ParticleChangeFunc::FUNC_SQUARE: if ((tick % changePeriod) * 2 < changePeriod) val += changeAmplitude; else val -= changeAmplitude; break; case ParticleChangeFunc::FUNC_NONE: default: // nothing break; } return val; } T minVal; T maxVal; ParticleChangeFuncT changeFunc; T changeAmplitude; int changePeriod; int changePhase; }; #endif // PARTICLE_PARTICLEEMITTERPROP_H