/******************************************************************** Definition of CannonField class, Qt tutorial 8******************************************************************/#ifndef CANNON_H#define CANNON_H#include <qwidget.h>class CannonField : public QWidget{    Q_OBJECTpublic:    CannonField( QWidget *parent=0, const char *name=0 );    int angle() const { return ang; }    QSizePolicy sizePolicy() const;public slots:    void setAngle( int degrees );signals:    void angleChanged( int );protected:    void paintEvent( QPaintEvent * );private:    int ang;};#endif // CANNON_H