cannon.h

在这个例子中我们开始画一个蓝色可爱的小加农炮

#ifndef CANNON_H
#define CANNON_H

#include <qwidget.h>


class CannonField : public QWidget
{
    Q_OBJECT
public:
    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