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diff --git a/src/particles/qquickgravity_p.h b/src/particles/qquickgravity_p.h
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+++ b/src/particles/qquickgravity_p.h
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+/****************************************************************************
+**
+** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/
+**
+** This file is part of the QtQuick module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** GNU Lesser General Public License Usage
+** 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.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU General
+** Public License version 3.0 as published by the Free Software Foundation
+** and appearing in the file LICENSE.GPL included in the packaging of this
+** file. Please review the following information to ensure the GNU General
+** Public License version 3.0 requirements will be met:
+** http://www.gnu.org/copyleft/gpl.html.
+**
+** Other Usage
+** Alternatively, this file may be used in accordance with the terms and
+** conditions contained in a signed written agreement between you and Nokia.
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef GRAVITYAFFECTOR_H
+#define GRAVITYAFFECTOR_H
+#include "qquickparticleaffector_p.h"
+
+QT_BEGIN_HEADER
+
+QT_BEGIN_NAMESPACE
+
+class QQuickGravityAffector : public QQuickParticleAffector
+{
+    Q_OBJECT
+    Q_PROPERTY(qreal magnitude READ magnitude WRITE setMagnitude NOTIFY magnitudeChanged)
+    Q_PROPERTY(qreal acceleration READ magnitude WRITE setAcceleration NOTIFY magnitudeChanged)
+    Q_PROPERTY(qreal angle READ angle WRITE setAngle NOTIFY angleChanged)
+public:
+    explicit QQuickGravityAffector(QQuickItem *parent = 0);
+    qreal magnitude() const
+    {
+        return m_magnitude;
+    }
+
+    qreal angle() const
+    {
+        return m_angle;
+    }
+protected:
+    virtual bool affectParticle(QQuickParticleData *d, qreal dt);
+signals:
+
+    void magnitudeChanged(qreal arg);
+
+    void angleChanged(qreal arg);
+
+public slots:
+void setAcceleration(qreal arg)
+{
+    qWarning() << "Gravity::acceleration has been renamed Gravity::magnitude";
+    if (m_magnitude != arg) {
+        m_magnitude = arg;
+        m_needRecalc = true;
+        emit magnitudeChanged(arg);
+    }
+}
+
+void setMagnitude(qreal arg)
+{
+    if (m_magnitude != arg) {
+        m_magnitude = arg;
+        m_needRecalc = true;
+        emit magnitudeChanged(arg);
+    }
+}
+
+void setAngle(qreal arg)
+{
+    if (m_angle != arg) {
+        m_angle = arg;
+        m_needRecalc = true;
+        emit angleChanged(arg);
+    }
+}
+
+private:
+    qreal m_magnitude;
+    qreal m_angle;
+
+    bool m_needRecalc;
+    qreal m_dx;
+    qreal m_dy;
+};
+
+QT_END_NAMESPACE
+QT_END_HEADER
+#endif // GRAVITYAFFECTOR_H