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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