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#ifndef ANIMATION_H
#define ANIMATION_H

#include <QPropertyAnimation>
#include <QtGui>

class Animation : public QPropertyAnimation
{
public:
    enum PathType { LinearPath, CirclePath, NPathTypes };
    Animation ( QObject *target, const QByteArray &prop )
        : QPropertyAnimation ( target, prop )
    {
        m_pathType = NPathTypes;
        m_path = QPainterPath();
    }

    void setPathType ( PathType pathType )
    {
        if ( pathType >= NPathTypes ) {
            qWarning ( "Unknown pathType %d", pathType );
        }

        m_pathType = pathType;
        m_path = QPainterPath();
    }

    void updateCurrentTime ( int currentTime )
    {
        if ( m_pathType == CirclePath ) {
            if ( m_path.isEmpty() ) {
                QPointF to = endValue().toPointF();
                QPointF from = startValue().toPointF();
                m_path.moveTo ( from );
                m_path.addEllipse ( QRectF ( from, to ) );
            }
            int dura = duration();
            const qreal progress = ( ( dura == 0 ) ? 1 : ( ( ( ( currentTime - 1 ) % dura ) + 1 ) / qreal ( dura ) ) );

            qreal easedProgress = easingCurve().valueForProgress ( progress );
            if ( easedProgress > 1.0 ) {
                easedProgress -= 1.0;
            } else if ( easedProgress < 0 ) {
                easedProgress += 1.0;
            }
            QPointF pt = m_path.pointAtPercent ( easedProgress );
            updateCurrentValue ( pt );
            emit valueChanged ( pt );
        } else {
            QPropertyAnimation::updateCurrentTime ( currentTime );
        }
    }

    QPainterPath m_path;
    PathType m_pathType;
};

#endif // ANIMATION_H
