If you want to force several nodes to the same level
with fixed index, you can set the level index parameter of these nodes
accordingly (see Level index parameter (HL)) or use a
level range constraint (see Level range constraints (HL)). However,
if you want to force several nodes to the same level without forcing them to a specific
level index, you cannot use these mechanisms. You must use a same
level constraint.
To set the same level constraint:
Call:
layout.addConstraint(new ibm_ilog.graphlayout.hierarchical.HierarchicalSameLevelConstraint(node1, node2));
This forces
node1
and node2
to
be placed in the same level, but it does not constrain them to any
particular level. The following figure illustrates the placement of nodes
at the same level.

All nodes fixed at same level