diff -r 0fad394bc330 -r 31841b366d5e geometry.h
--- a/geometry.h	Wed Mar 10 15:36:19 2010 +0000
+++ b/geometry.h	Mon Mar 15 11:49:42 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);