/* * The ManaPlus Client * Copyright (C) 2006-2009 The Mana World Development Team * Copyright (C) 2009-2010 The Mana Developers * Copyright (C) 2011-2014 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/>. */ #include "particle/rotationalparticle.h" #include "simpleanimation.h" #include "utils/delete2.h" #include <cmath> #include "debug.h" static const double PI = M_PI; static const float PI2 = 2 * M_PI; RotationalParticle::RotationalParticle(Animation *const animation) : ImageParticle(nullptr), mAnimation(new SimpleAnimation(animation)) { } RotationalParticle::RotationalParticle(const XmlNodePtr animationNode, const std::string& dyePalettes) : ImageParticle(nullptr), mAnimation(new SimpleAnimation(animationNode, dyePalettes)) { } RotationalParticle::~RotationalParticle() { delete2(mAnimation); mImage = nullptr; } bool RotationalParticle::update() { if (!mAnimation) return false; // TODO: cache velocities to avoid spamming atan2() const int size = mAnimation->getLength(); if (!size) return false; float rad = static_cast<float>(atan2(mVelocity.x, mVelocity.y)); if (rad < 0) rad = PI2 + rad; const float range = static_cast<const float>(PI / size); // Determines which frame the particle should play if (rad < range || rad > PI2 - range) { mAnimation->setFrame(0); } else { for (int c = 1; c < size; c++) { if (((static_cast<float>(c) * (2 * range)) - range) < rad && rad < ((static_cast<float>(c) * (2 * range)) + range)) { mAnimation->setFrame(c); break; } } } mImage = mAnimation->getCurrentImage(); return Particle::update(); }