Description:

This module is intended to generate 2-dimensional fractal curves such
as the von Koch curve from simple generator functions.

The fractals are generated by recursively replacing a distance with
the generator. Hence, the starting distance and the generator define
such a fractal curve. Generators describe what a given distance is
going to be replaced with in terms of lengths of the distance. For
example, a generator of ([0, 0, 1/3, 0], [2/3, 0, 1, 0]) describes a
Mid-third Cantor Set which means the the middle third of every
distance in the set is deleted. Syntax for generator data structures
in the context of this module is [[x1, y1, x2, y2], [X1, Y1, X2, Y2]]
(array ref of array refs of edge coordinates) where xn,yn are the two
coordinate pairs specifying the first edge a distance is to be
replaced with and Xn,Yn are the second edge. There may be any number
of edges.