Graphviz set edge initial direction

Question

When I draw a diagram with spline=ortho graphviz sometimes draws edges that go down and then left or right:

 +--[ ]
 |   |
 v   |
[ ]  +->[ ]

How can I specify that edges should depart horizontally from a node?

 +--[ ]--+
 |       |
 v       v
[ ]     [ ]

Answer 1

This is currently (Version 2.38) not working. The compass points are not implemented for spline=ortho. see Issue 352