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cannonfield.h Example File
tutorials/tutorial/t12/cannonfield.h

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 #ifndef CANNON_H
 #define CANNON_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();
     void newTarget();

 private slots:
     void moveShot();

 signals:
     void hit();
     void missed();
     void angleChanged(int newAngle);
     void forceChanged(int newForce);

 protected:
     void paintEvent(QPaintEvent *event);

 private:
     void paintShot(QPainter &painter);
     void paintTarget(QPainter &painter);
     void paintCannon(QPainter &painter);
     QRect cannonRect() const;
     QRect shotRect() const;
     QRect targetRect() const;

     int currentAngle;
     int currentForce;

     int timerCount;
     QTimer *autoShootTimer;
     float shootAngle;
     float shootForce;

     QPoint target;
 };

 #endif