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diff --git a/tutorial/t12/cannon.h b/tutorial/t12/cannon.h
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+++ b/tutorial/t12/cannon.h
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+/****************************************************************
+**
+** Definition of CannonField class, Qt tutorial 12
+**
+****************************************************************/
+
+#ifndef CANNON_H
+#define CANNON_H
+
+class QTimer;
+
+
+#include <qwidget.h>
+
+
+class CannonField : public QWidget
+{
+    Q_OBJECT
+public:
+    CannonField( QWidget *parent=0, const char *name=0 );
+
+    int   angle() const { return ang; }
+    int   force() const { return f; }
+    QSizePolicy sizePolicy() const;
+
+public slots:
+    void  setAngle( int degrees );
+    void  setForce( int newton );
+    void  shoot();
+    void  newTarget();
+
+private slots:
+    void  moveShot();
+
+signals:
+    void  hit();
+    void  missed();
+    void  angleChanged( int );
+    void  forceChanged( int );
+
+protected:
+    void  paintEvent( QPaintEvent * );
+
+private:
+    void  paintShot( QPainter * );
+    void  paintTarget( QPainter * );
+    void  paintCannon( QPainter * );
+    QRect cannonRect() const;
+    QRect shotRect() const;
+    QRect targetRect() const;
+
+    int ang;
+    int f;
+
+    int timerCount;
+    QTimer * autoShootTimer;
+    float shoot_ang;
+    float shoot_f;
+
+    QPoint target;
+};
+
+
+#endif // CANNON_H