diff -r 0bba81dde1bc -r 36eb4b8f409e geometry.cpp
--- a/geometry.cpp	Fri Feb 19 13:47:03 2010 +0000
+++ b/geometry.cpp	Thu Feb 25 11:03:52 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 ()
 {
 }