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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 "attractoraffector.h"
+#include <cmath>
+#include <QDebug>
+QT_BEGIN_NAMESPACE
+AttractorAffector::AttractorAffector(QSGItem *parent) :
+ ParticleAffector(parent), m_strength(0.0), m_x(0), m_y(0)
+{
+}
+
+bool AttractorAffector::affectParticle(ParticleData *d, qreal dt)
+{
+ if(m_strength == 0.0)
+ return false;
+ qreal dx = m_x - d->curX();
+ qreal dy = m_y - d->curY();
+ qreal r = sqrt((dx*dx) + (dy*dy));
+ qreal theta = atan2(dy,dx);
+ qreal ds = (m_strength / r) * dt;
+ dx = ds * cos(theta);
+ dy = ds * sin(theta);
+ d->setInstantaneousSX(d->pv.sx + dx);
+ d->setInstantaneousSY(d->pv.sy + dy);
+ return true;
+}
+QT_END_NAMESPACE