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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 "qsggravity_p.h"
#include <cmath>
QT_BEGIN_NAMESPACE
const qreal CONV = 0.017453292520444443;
QSGGravityAffector::QSGGravityAffector(QSGItem *parent) :
QSGParticleAffector(parent), m_acceleration(-10), m_angle(90), m_xAcc(0), m_yAcc(0)
{
connect(this, SIGNAL(accelerationChanged(qreal)),
this, SLOT(recalc()));
connect(this, SIGNAL(angleChanged(qreal)),
this, SLOT(recalc()));
recalc();
}
void QSGGravityAffector::recalc()
{
qreal theta = m_angle * CONV;
m_xAcc = m_acceleration * cos(theta);
m_yAcc = m_acceleration * sin(theta);
}
bool QSGGravityAffector::affectParticle(QSGParticleData *d, qreal dt)
{
Q_UNUSED(dt);
bool changed = false;
if (d->ax != m_xAcc){
d->setInstantaneousAX(m_xAcc);
changed = true;
}
if (d->ay != m_yAcc){
d->setInstantaneousAY(m_yAcc);
changed = true;
}
return changed;
}
QT_END_NAMESPACE
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