在生成可视化道路图时，需要利用空间数据将空间对象的位置投影到二维的平面上。
When the map is rendered, this spatial data is used to project the locations of the objects on a two-dimensional piece of paper.
运用面向对象技术，抽象出二维分形图形类，二维分形图形类能够根据模板文件的实际参数动态生成各种分形图对象。
Based OO technique, abstracts a class of 2d fractal images, according to the real parameter of template file, the class is able to dynamically produce various kinds of fractal objects instance.
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