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cannonfield.h Example File
^{tutorial/t9/cannonfield.h}

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    #ifndef CANNONFIELD_H
    #define CANNONFIELD_H

    #include <QWidget>

    class CannonField : public QWidget
    {
        Q_OBJECT

    public:
        CannonField(QWidget *parent = 0);

        int angle() const { return currentAngle; }

    public slots:
        void setAngle(int angle);

    signals:
        void angleChanged(int newAngle);

    protected:
        void paintEvent(QPaintEvent *event);

    private:
        int currentAngle;
    };

    #endif