绘制一些特别的图形，以及一些曲线，如B样条，图形的裁剪

gef是基于Draw2D的图形框架，本工程是我在做流程图的时候参考一本英文的指导书编写的例子，内容不算复杂，主要是一个建立流程图的例子。适合于gef入门研究-gef Draw2D based graphics framework, the project is when I' m doing a flow chart refer to the guidance of a book written in the English example, the content is not comp

一个用js做的矢量图程序，非常简单，容易学习。好东西。-Js to do a vector with the procedure, very simple, easy to learn. Good things.