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/* |
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* The ManaPlus Client |
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* Copyright (C) 2006-2009 The Mana World Development Team |
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* Copyright (C) 2009-2010 The Mana Developers |
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* Copyright (C) 2011-2019 The ManaPlus Developers |
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* Copyright (C) 2019-2021 Andrei Karas |
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* |
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* This file is part of The ManaPlus Client. |
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* |
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* This program is free software; you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License as published by |
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* the Free Software Foundation; either version 2 of the License, or |
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* any later version. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with this program. If not, see <http://www.gnu.org/licenses/>. |
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*/ |
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#ifndef PARTICLE_PARTICLEEMITTERPROP_H |
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#define PARTICLE_PARTICLEEMITTERPROP_H |
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#include <cmath> |
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#include "enums/particle/particlechangefunc.h" |
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#include "localconsts.h" |
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template <typename T> struct ParticleEmitterProp final |
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{ |
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ParticleEmitterProp() : |
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minVal(0), |
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maxVal(0), |
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changeFunc(ParticleChangeFunc::FUNC_NONE), |
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changeAmplitude(0), |
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changePeriod(0), |
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changePhase(0) |
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{ |
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} |
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A_DEFAULT_COPY(ParticleEmitterProp) |
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void set(const T min, const T max) |
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{ |
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minVal = min; |
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maxVal = max; |
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} |
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void set(const T val) |
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{ |
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set(val, val); |
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} |
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void setFunction(ParticleChangeFuncT func, |
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T amplitude, |
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const int period, |
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const int phase) |
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{ |
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changeFunc = func; |
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changeAmplitude = amplitude; |
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changePeriod = period; |
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if (changePeriod == 0) |
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changePeriod = 1; |
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changePhase = phase; |
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} |
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T value(int tick) const |
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{ |
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tick += changePhase; |
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T val = static_cast<T>(minVal + (maxVal - minVal) |
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* (rand() / (static_cast<double>(RAND_MAX) + 1))); |
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switch (changeFunc) |
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{ |
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case ParticleChangeFunc::FUNC_SINE: |
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val += static_cast<T>(std::sin(M_PI * 2 * (static_cast<double>( |
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tick % changePeriod) / static_cast<double>( |
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changePeriod)))) * changeAmplitude; |
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break; |
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case ParticleChangeFunc::FUNC_SAW: |
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val += static_cast<T>(changeAmplitude * (static_cast<double>( |
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tick % changePeriod) / static_cast<double>( |
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changePeriod))) * 2 - changeAmplitude; |
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break; |
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case ParticleChangeFunc::FUNC_TRIANGLE: |
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if ((tick % changePeriod) * 2 < changePeriod) |
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{ |
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val += changeAmplitude - static_cast<T>(( |
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tick % changePeriod) / static_cast<double>( |
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changePeriod)) * changeAmplitude * 4; |
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} |
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else |
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{ |
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val += changeAmplitude * -3 + static_cast<T>(( |
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tick % changePeriod) / static_cast<double>( |
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changePeriod)) * changeAmplitude * 4; |
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// I have no idea why this works but it does |
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} |
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break; |
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case ParticleChangeFunc::FUNC_SQUARE: |
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if ((tick % changePeriod) * 2 < changePeriod) |
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val += changeAmplitude; |
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else |
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val -= changeAmplitude; |
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break; |
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case ParticleChangeFunc::FUNC_NONE: |
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default: |
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// nothing |
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break; |
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} |
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return val; |
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} |
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T minVal; |
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T maxVal; |
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ParticleChangeFuncT changeFunc; |
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T changeAmplitude; |
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int changePeriod; |
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int changePhase; |
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}; |
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#endif // PARTICLE_PARTICLEEMITTERPROP_H |