1. Introduction Graphviz is an open-source drawing toolkit developed at Bell Labs. It uses a specific DSL (domain-specific language), DOT, as its scripting language. It uses layout engines to parse DOT scripts and complete automatic layout. It supports a rich set of export formats, such as PNG, JPG, PostScript, SVG,

1. Fractal Theory 1.1 The Definition of a Fractal A fractal usually refers to a geometric shape that can be divided into several parts, each of which is approximately a reduced-scale copy of the whole — that is, it has the property of self-similarity. 1.2 The History of Fractal Research In the 17th century, Leibniz already pondered the problem of self-similarity.