The flow direction parameter specifies the direction
of the tree links. The compass icons show the compass directions in
these layouts.

Flow directions
If the flow direction is to the bottom, the root node
is placed at the top. Each parent node is placed above its child nodes,
which are normally arranged horizontally. This tip-over alignment
is an exception.
If the flow direction is to the right, the root node
is placed at the left. Each parent node is placed to the left of its
child nodes, which are normally arranged vertically.
To specify the flow direction:
Use the method setFlowDirection:
treeLayout.setFlowDirection(ibm_ilog.graphlayout.Direction.BOTTOM);
The valid values for the flow direction are:
- ibm_ilog.graphlayout.Direction.RIGHT (the default)
- ibm_ilog.graphlayout.Direction.LEFT
- ibm_ilog.graphlayout.Direction.BOTTOM
- ibm_ilog.graphlayout.Direction.TOP