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 <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 (qrand() % 200 + 1 == 3)
              submarine->launchTorpedo(qrand() % 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