submarine_p.h Example File
demos/sub-attaq/submarine_p.h
 #ifndef SUBMARINE_P_H
 #define SUBMARINE_P_H
 #include "animationmanager.h"
 #include "submarine.h"
 #include "qanimationstate.h"
 #include <QtCore/QPropertyAnimation>
 #include <QtGui/QGraphicsScene>
 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  {
             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;
 };
 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 
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