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

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     #ifndef __GRAPHICSSCENE__H__
     #define __GRAPHICSSCENE__H__

     //Qt
     #include <QtGui/QGraphicsScene>
     #include <QtCore/QSet>
     #include <QtCore/QState>

     class Boat;
     class SubMarine;
     class Torpedo;
     class Bomb;
     class PixmapItem;
     class ProgressItem;
     class TextInformationItem;
     class QAction;

     class GraphicsScene : public QGraphicsScene
     {
     Q_OBJECT
     public:
         enum Mode {
             Big = 0,
             Small
         };

         struct SubmarineDescription {
             int type;
             int points;
             QString name;
         };

         struct LevelDescription {
             int id;
             QString name;
             QList<QPair<int,int> > submarines;
         };

         GraphicsScene(int x, int y, int width, int height, Mode mode = Big);
         qreal sealLevel() const;
         void setupScene(QAction *newAction, QAction *quitAction);
         void addItem(Bomb *bomb);
         void addItem(Torpedo *torpedo);
         void addItem(SubMarine *submarine);
         void addItem(QGraphicsItem *item);
         void clearScene();

     signals:
         void subMarineDestroyed(int);
         void allSubMarineDestroyed(int);

     private slots:
         void onBombExecutionFinished();
         void onTorpedoExecutionFinished();
         void onSubMarineExecutionFinished();

     private:
         Mode mode;
         ProgressItem *progressItem;
         TextInformationItem *textInformationItem;
         Boat *boat;
         QSet<SubMarine *> submarines;
         QSet<Bomb *> bombs;
         QSet<Torpedo *> torpedos;
         QVector<SubmarineDescription> submarinesData;
         QHash<int, LevelDescription> levelsData;

         friend class PauseState;
         friend class PlayState;
         friend class LevelState;
         friend class LostState;
         friend class WinState;
         friend class WinTransition;
         friend class UpdateScoreTransition;
     };

     #endif //__GRAPHICSSCENE__H__