# HG changeset patch
# User hegyi
# Date 1171986379 0
# Node ID 8b69c54d5bf0d5c867ebbf632bf2103e4f9711f9
# Parent  c1c9fcf03e9471b4643f0b7862a2e2f114f7e4e8
No segmentation fault will be occured if two nodes are exactly overlap each other, AND they are connected.

diff -r c1c9fcf03e94 -r 8b69c54d5bf0 gdc-broken_edge.cc
--- a/gdc-broken_edge.cc	Sat Feb 03 12:43:01 2007 +0000
+++ b/gdc-broken_edge.cc	Tue Feb 20 15:46:19 2007 +0000
@@ -93,7 +93,10 @@
   XY unit_vector_in_dir(head-center);
   double length=sqrt( unit_vector_in_dir.normSquare() );
 
-  unit_vector_in_dir/=length;
+  if(length!=0)
+    {
+      unit_vector_in_dir/=length;
+    }
 
   // update the arrow
   drawArrow(unit_vector_in_dir);