diff -r d251c7b2de54 -r bfacef6f29c1 geometry.cpp
--- a/geometry.cpp	Thu Oct 01 11:28:50 2009 +0000
+++ b/geometry.cpp	Tue Mar 09 13:09:05 2010 +0000
@@ -48,6 +48,11 @@
     return false;	
 }
 
+qreal distance (const QPointF &p, const QPointF &q)
+{
+	return sqrt (p.x()*q.x() + p.y()*q.y());
+}
+
 Vector::Vector ():QPointF ()
 {
 }