/****************************************************************************
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** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/
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** This file is part of the QtQuick module of the Qt Toolkit.
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** GNU Lesser General Public License Usage
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** file. Please review the following information to ensure the GNU Lesser
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** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
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** 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
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** file. Please review the following information to ensure the GNU General
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****************************************************************************/

#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