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cannonfield.h Example File
^{tutorial/t11/cannonfield.h}

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    ** This file is part of the documentation of the Qt Toolkit.
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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; }

    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