Gets the position for the given Node/Group as dictated by either the left/top properties, or some other nominated pair, in the Node/Group's data.
This position is what the Absolute layout uses itself, and this method exposes the absolute position for subclasses that wish to make use
of the absolute backing.
Node/Group to get absolute position for.
Optionalparameters: LayoutParametersConstructor parameters. May contain a custom locationFunction.
Balloon layout arranges the direct children of some vertex in a circle around that vertex, recursively. It is best used for hierarchical data, in particular where each vertex has a single parent