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# cannonfield.h Example File
tutorial/t14/cannonfield.h

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     #ifndef CANNONFIELD_H
     #define CANNONFIELD_H

     #include <QWidget>

     class QTimer;

     class CannonField : public QWidget
     {
         Q_OBJECT

     public:
         CannonField(QWidget *parent = 0);

         int angle() const { return currentAngle; }
         int force() const { return currentForce; }
         bool gameOver() const { return gameEnded; }
         bool isShooting() const;
         QSize sizeHint() const;

     public slots:
         void setAngle(int angle);
         void setForce(int force);
         void shoot();
         void newTarget();
         void setGameOver();
         void restartGame();

     private slots:
         void moveShot();

     signals:
         void hit();
         void missed();
         void angleChanged(int newAngle);
         void forceChanged(int newForce);
         void canShoot(bool can);

     protected:
         void paintEvent(QPaintEvent *event);
         void mousePressEvent(QMouseEvent *event);
         void mouseMoveEvent(QMouseEvent *event);
         void mouseReleaseEvent(QMouseEvent *event);

     private:
         void paintShot(QPainter &painter);
         void paintTarget(QPainter &painter);
         void paintBarrier(QPainter &painter);
         void paintCannon(QPainter &painter);
         QRect cannonRect() const;
         QRect shotRect() const;
         QRect targetRect() const;
         QRect barrierRect() const;
         bool barrelHit(const QPoint &pos) const;

         int currentAngle;
         int currentForce;

         int timerCount;
         QTimer *autoShootTimer;
         float shootAngle;
         float shootForce;

         QPoint target;

         bool gameEnded;
         bool barrelPressed;
     };

     #endif