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/*
* 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/>.
*/
#include "particle/rotationalparticle.h"
#include "resources/animation/simpleanimation.h"
#include "utils/delete2.h"
#include "debug.h"
static const double PI = M_PI;
static const float PI2 = 2 * M_PI;
RotationalParticle::RotationalParticle(Animation *restrict const animation) :
ImageParticle(nullptr),
mAnimation(new SimpleAnimation(animation))
{
}
RotationalParticle::RotationalParticle(const XmlNodePtr animationNode,
const std::string &restrict
dyePalettes) :
ImageParticle(nullptr),
mAnimation(new SimpleAnimation(animationNode, dyePalettes))
{
}
RotationalParticle::~RotationalParticle()
{
delete2(mAnimation);
mImage = nullptr;
}
bool RotationalParticle::update() restrict2
{
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();
}
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