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/****************************************************************************
**
** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the Declarative module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** No Commercial Usage
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the Technology Preview License Agreement accompanying
** this package.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
**
**
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "speedlimitaffector.h"
#include <cmath>
#include <QDebug>
QT_BEGIN_NAMESPACE
SpeedLimitAffector::SpeedLimitAffector(QSGItem *parent) :
ParticleAffector(parent), m_speedLimit(-1)
{
}
bool SpeedLimitAffector::affectParticle(ParticleData *d, qreal dt){
Q_UNUSED(dt);
if(m_speedLimit <= 0)
return false;
qreal x = d->curSX();
qreal y = d->curSY();
qreal s = sqrt(x*x + y*y);
if(s <= m_speedLimit)
return false;
if(s >= m_speedLimit*1.01){
qreal theta = atan2(y,x);
d->setInstantaneousSX(m_speedLimit * cos(theta));
d->setInstantaneousSY(m_speedLimit * sin(theta));
}
d->setInstantaneousAY(0);
d->setInstantaneousAX(0);
return true;
}
QT_END_NAMESPACE
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