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/* |
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* The Mana World |
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* Copyright (C) 2006 The Mana World Development Team |
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* |
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* This file is part of The Mana World. |
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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, write to the Free Software |
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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*/ |
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|
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#include "rotationalparticle.h" |
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#include "graphics.h" |
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#include "simpleanimation.h" |
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|
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#define PI 3.14159265 |
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|
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RotationalParticle::RotationalParticle(Map *map, Animation *animation): |
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ImageParticle(map, NULL), |
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mAnimation(new SimpleAnimation(animation)) |
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{ |
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} |
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|
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RotationalParticle::RotationalParticle(Map *map, xmlNodePtr animationNode): |
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ImageParticle(map, 0), |
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mAnimation(new SimpleAnimation(animationNode)) |
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{ |
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} |
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|
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RotationalParticle::~RotationalParticle() |
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{ |
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delete mAnimation; |
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mImage = NULL; |
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} |
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|
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bool RotationalParticle::update() |
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{ |
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// TODO: cache velocities to avoid spamming atan2() |
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|
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float rad = atan2(mVelocity.x, mVelocity.y); |
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if (rad < 0) |
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rad = PI + (PI + rad); |
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int size = mAnimation->getLength(); |
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float range = PI / size; |
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|
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// Determines which frame the particle should play |
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if (rad < range || rad > ((PI*2) - range)) |
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{ |
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mAnimation->setFrame(0); |
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} |
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else |
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{ |
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for (int c = 1; c < size; c++) |
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{ |
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if (((c * (2 * range)) - range) < rad && rad < ((c * (2 * range)) + range)) |
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{ |
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mAnimation->setFrame(c); |
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break; |
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} |
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} |
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} |
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|
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mImage = mAnimation->getCurrentImage(); |
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|
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return Particle::update(); |
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} |
