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

    /****************************************************************************
    **
    ** Copyright (C) 2005-2006 Trolltech ASA. All rights reserved.
    **
    ** This file is part of the example classes of the Qt Toolkit.
    **
    ** Licensees holding valid Qt Preview licenses may use this file in
    ** accordance with the Qt Preview License Agreement provided with the
    ** Software.
    **
    ** See http://www.trolltech.com/pricing.html or email sales@trolltech.com for
    ** information about Qt Commercial License Agreements.
    **
    ** Contact info@trolltech.com if any conditions of this licensing are
    ** not clear to you.
    **
    ** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
    ** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
    **
    ****************************************************************************/

    #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