diff -r 36eb4b8f409e -r 988f1908a7c4 geometry.h
--- a/geometry.h	Thu Feb 25 11:03:52 2010 +0000
+++ b/geometry.h	Fri Jul 23 16:43:49 2010 +0000
@@ -18,6 +18,7 @@
 	friend inline bool operator==(const Vector &v1, const Vector &v2 )
 	{ return v1.x()==v2.x() && v1.y()==v2.y(); }
 
+	bool isNull();
 	virtual void normalize ();
 	virtual qreal dotProduct (const QPointF &b);
 	virtual void scale  (const qreal &f);