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

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        /****************************************************************
        **
        ** Definition of CannonField class, Qt tutorial 14
        **
        ****************************************************************/

        #ifndef CANNON_H
        #define CANNON_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 // CANNON_H