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