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# cannonfield.h Example File
tutorial/t13/cannonfield.h

        /****************************************************************************
        **
        ** Copyright (C) 2005-2005 Trolltech AS. All rights reserved.
        **
        ** This file is part of the documentation of the Qt Toolkit.
        **
        ** This file may be used under the terms of the GNU General Public
        ** License version 2.0 as published by the Free Software Foundation
        ** and appearing in the file LICENSE.GPL included in the packaging of
        ** this file.  Please review the following information to ensure GNU
        ** General Public Licensing requirements will be met:
        ** http://www.trolltech.com/products/qt/opensource.html
        **
        ** If you are unsure which license is appropriate for your use, please
        ** review the following information:
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        **
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        ** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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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;

        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);

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

            int currentAngle;
            int currentForce;

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

            QPoint target;

            bool gameEnded;
        };

        #endif