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#ifndef GRAVITYAFFECTOR_H
#define GRAVITYAFFECTOR_H

//
//  W A R N I N G
//  -------------
//
// This file is not part of the Qt API.  It exists purely as an
// implementation detail.  This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//
#include "qquickparticleaffector_p.h"

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);
Q_SIGNALS:

    void magnitudeChanged(qreal arg);

    void angleChanged(qreal arg);

public Q_SLOTS:
void setAcceleration(qreal arg)
{
    qWarning() << "Gravity::acceleration has been renamed Gravity::magnitude";
    if (m_magnitude != arg) {
        m_magnitude = arg;
        m_needRecalc = true;
        Q_EMIT magnitudeChanged(arg);
    }
}

void setMagnitude(qreal arg)
{
    if (m_magnitude != arg) {
        m_magnitude = arg;
        m_needRecalc = true;
        Q_EMIT magnitudeChanged(arg);
    }
}

void setAngle(qreal arg)
{
    if (m_angle != arg) {
        m_angle = arg;
        m_needRecalc = true;
        Q_EMIT angleChanged(arg);
    }
}

private:
    qreal m_magnitude;
    qreal m_angle;

    bool m_needRecalc;
    qreal m_dx;
    qreal m_dy;
};

QT_END_NAMESPACE
#endif // GRAVITYAFFECTOR_H
