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cannonfield.h Example File
^{tutorial/t12/cannonfield.h}

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    #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();
        void newTarget();

    private slots:
        void moveShot();

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

    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;
    };

    #endif