The layout algorithm automatically positions the end
points of links (the connector pins) at the nodes. The connector style
parameter specifies how these end points are calculated for the outgoing
links at the parent node.
By default, the connector style determines how the connection
points of the links are distributed on the border of the bounding
box of the nodes, symmetrically with respect to the middle of each
side.

Connector styles
To specify the connector style:
Use the method setConnectorStyle:
treeLayout.setConnectorStyle(ibm_ilog.graphlayout.tree.TreeLayout.CENTERED_PINS);
The valid values for connectorStyle are:
ibm_ilog.graphlayout.tree.TreeLayout.CENTERED_PINS
The end points of the links are placed in the center of the border where the links are attached.ibm_ilog.graphlayout.tree.TreeLayout.EVENLY_SPACED_PINS
The connector pins are evenly distributed along the node border. This style works for straight and orthogonal links.ibm_ilog.graphlayout.tree.TreeLayout.AUTOMATIC_PINS
The connector style is selected automatically depending on the link style and the layout mode. In nonradial modes, the algorithm always chooses centered pins. In radial layout modes, it clips the pins at the bounding box of the nodes.
The connector style and the link connection box interface
work together in the following way: by applying the connector style,
the proposed connection points are calculated on the rectangle obtained
from the link connection box interface (or on the bounding box of
the node, if no link connection box interface was specified).
The following figure shows an example of the combined
effect.
If the links are connected to the pink node in the figure
(left), they appear unsymmetrical with respect to the node shape,
because the relevant part of the node (here: the upper rhombus) is
not in the center of the bounding box of the node, but the proposed
connection points are calculated with respect to the bounding box.

Combined effect of clipping and link connection box
It can be corrected by using a link connection box interface
to explicitly specify a smaller connection box for the relevant part
of the node (previous figure, right) such that the proposed connection
points are placed symmetrically at the upper rhombus of the node.