Although GoLayout includes a sophisticated tree layout algorithm, GoLayoutTree, supporting many kinds of customization, there has always been a very simple tree layout algorithm in the samples, embedded in the Classier and in the FamilyTree sample applications.
The SimpleTreeLayout example class in Demo1 cleans up that code and puts it into its own class, making it easier to use and slightly more general.
Here's a screenshot of a tree diagram created in Demo1, and laid out in a Horizontal Orientation: