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# cannonfield.h Example File
tutorial/t11/cannonfield.h

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        /****************************************************************
        **
        ** Definition of CannonField class, Qt tutorial 11
        **
        ****************************************************************/

        #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; }

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

        private slots:
            void moveShot();

        signals:
            void angleChanged(int newAngle);
            void forceChanged(int newForce);

        protected:
            void paintEvent(QPaintEvent *event);

        private:
            void paintShot(QPainter &painter);
            void paintCannon(QPainter &painter);
            QRect cannonRect() const;
            QRect shotRect() const;

            int currentAngle;
            int currentForce;

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

        #endif // CANNON_H