1.1 --- a/geometry.h	Wed Mar 10 15:36:19 2010 +0000
     1.2 +++ b/geometry.h	Mon Mar 15 11:49:42 2010 +0000
     1.3 @@ -18,6 +18,7 @@
     1.4  	friend inline bool operator==(const Vector &v1, const Vector &v2 )
     1.5  	{ return v1.x()==v2.x() && v1.y()==v2.y(); }
     1.6  
     1.7 +	bool isNull();
     1.8  	virtual void normalize ();
     1.9  	virtual qreal dotProduct (const QPointF &b);
    1.10  	virtual void scale  (const qreal &f);