submarine_p.h Example File

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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 <QtCore/QRandomGenerator>
 #include <QtWidgets/QGraphicsScene>

 //This state is describing when the boat is moving right
 class MovementState : public QAnimationState
 {
 Q_OBJECT
 public:
     explicit 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 (QRandomGenerator::global()->bounded(200) + 1 == 3)
             submarine->launchTorpedo(QRandomGenerator::global()->bounded(3) + 1);
     }

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

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

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

 #endif // SUBMARINE_P_H