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****************************************************************************/

#ifndef TURBULENCEAFFECTOR_H
#define TURBULENCEAFFECTOR_H
#include "qquickparticleaffector_p.h"
#include <QQmlListProperty>

QT_BEGIN_HEADER

QT_BEGIN_NAMESPACE

class QQuickParticlePainter;

class QQuickTurbulenceAffector : public QQuickParticleAffector
{
    Q_OBJECT
    Q_PROPERTY(qreal strength READ strength WRITE setStrength NOTIFY strengthChanged)
    Q_PROPERTY(QUrl noiseSource READ noiseSource WRITE setNoiseSource NOTIFY noiseSourceChanged)
    public:
    explicit QQuickTurbulenceAffector(QQuickItem *parent = 0);
    ~QQuickTurbulenceAffector();
    virtual void affectSystem(qreal dt);

    qreal strength() const
    {
        return m_strength;
    }

    QUrl noiseSource() const
    {
        return m_noiseSource;
    }
signals:

    void strengthChanged(qreal arg);

    void noiseSourceChanged(QUrl arg);

public slots:

    void setStrength(qreal arg)
    {
        if (m_strength != arg) {
            m_strength = arg;
            emit strengthChanged(arg);
        }
    }

    void setNoiseSource(QUrl arg)
    {
        if (m_noiseSource != arg) {
            m_noiseSource = arg;
            emit noiseSourceChanged(arg);
            initializeGrid();
        }
    }

protected:
    virtual void geometryChanged(const QRectF &newGeometry,
                                 const QRectF &oldGeometry);
private:
    void ensureInit();
    void mapUpdate();
    void initializeGrid();
    qreal boundsRespectingField(int x, int y);
    qreal m_strength;
    qreal m_lastT;
    int m_gridSize;
    qreal** m_field;
    QPointF** m_vectorField;
    bool m_inited;
    QUrl m_noiseSource;
};

QT_END_NAMESPACE
QT_END_HEADER
#endif // TURBULENCEAFFECTOR_H