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# submarine_p.h Example File
demos/sub-attaq/submarine_p.h

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     #ifndef SUBMARINE_P_H
     #define SUBMARINE_P_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.
     //

     //Own
     #include "animationmanager.h"
     #include "submarine.h"
     #include "qanimationstate.h"

     //Qt
     #include <QtCore/QPropertyAnimation>
     #include <QtGui/QGraphicsScene>

     //This state is describing when the boat is moving right
     class MovementState : public QAnimationState
     {
     Q_OBJECT
     public:
         MovementState(SubMarine *submarine, QState *parent = 0) : QAnimationState(parent)
         {
             movementAnimation = new QPropertyAnimation(submarine, "pos");
             connect(movementAnimation,SIGNAL(valueChanged(const QVariant &)),this,SLOT(onAnimationMovementValueChanged(const QVariant &)));
             setAnimation(movementAnimation);
             AnimationManager::self()->registerAnimation(movementAnimation);
             this->submarine = submarine;
         }

     protected slots:
         void onAnimationMovementValueChanged(const QVariant &)
         {
             if (qrand() % 200 + 1 == 3)
                 submarine->launchTorpedo(qrand() % 3 + 1);
         }

     protected:
         void onEntry(QEvent *e)
         {
             if (submarine->currentDirection() == SubMarine::Left) {
                 movementAnimation->setEndValue(QPointF(0,submarine->y()));
                 movementAnimation->setDuration(submarine->x()/submarine->currentSpeed()*12);
             }
             else /*if (submarine->currentDirection() == SubMarine::Right)*/ {
                 movementAnimation->setEndValue(QPointF(submarine->scene()->width()-submarine->size().width(),submarine->y()));
                 movementAnimation->setDuration((submarine->scene()->width()-submarine->size().width()-submarine->x())/submarine->currentSpeed()*12);
             }
             QAnimationState::onEntry(e);
         }

     private:
         SubMarine *submarine;
         QPropertyAnimation *movementAnimation;
     };

     //This state is describing when the boat is moving right
     class ReturnState : public QAnimationState
     {
     public:
         ReturnState(SubMarine *submarine, QState *parent = 0) : QAnimationState(parent)
         {
             returnAnimation = new QPropertyAnimation(submarine->rotation(), "angle");
             returnAnimation->setDuration(500);
             AnimationManager::self()->registerAnimation(returnAnimation);
             setAnimation(returnAnimation);
             this->submarine = submarine;
         }

     protected:
         void onEntry(QEvent *e)
         {
             returnAnimation->stop();
             returnAnimation->setEndValue(submarine->currentDirection() == SubMarine::Right ? 360. : 180.);
             QAnimationState::onEntry(e);
         }

         void onExit(QEvent *e)
         {
             submarine->currentDirection() == SubMarine::Right ? submarine->setCurrentDirection(SubMarine::Left) : submarine->setCurrentDirection(SubMarine::Right);
             QAnimationState::onExit(e);
         }

     private:
         SubMarine *submarine;
         QPropertyAnimation *returnAnimation;
     };

     #endif // SUBMARINE_P_H