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Just how much and in what ways the three influence each other is one source of complexity. One important task in implementing label placement, port placement, and node sizing is to determine the cases where we simply give up. If the user gives us fixed node sizes and fixed port positions, he cannot expect us to find an overlap-free label placement if port labels are to be placed inside the node.

Limitations of Our Algorithms

We cannot support everything – actually, many combinations of label placement, port placement, and node sizing constraints don't even make much sense. So here's a (possibly still growing – science can only do so much...) list of things we don't support:

• More than one port label. Who would want to have more than one anyway?