|Maintainer||Stephen Tetley <email@example.com>|
A variant of the tree drawing algorithm from Andrew Kennedy - Functional Pearls Drawing Trees 1996.
Acknowledgment - although based on Andrew Kennedy's algorithm, this version uses absolute extents rather than relative ones and is a somewhat different in detail if not in spirit to the original.
Any mistakes are mine of course.
Design a tree, properly balancing the child nodes oriented at root.
As the design has no y-positions (but by recursion they can be counted) and x-positions are respective to the unit distance 1.0 separating nodes it is rescaled as a post-processing step into drawable coordinates.