可应用于分形计算，生成分形几何，有两种方式：（1）生成三种预定义几何的一种；（2）一般使用方法。(fractal computation software.
Function to generate fractal geometries.
% Works in two ways: 1) Generation of one of the three
% predefined geometries or 2) general use, where axiom
% and generator must be specified.)