EMF、GEF官方例子源代码，学习编写图像建模必备资料，详细请浏览eclipse网站-EMF, GEF official source code examples, learn the necessary information to prepare the image modeling

利用GEF和EMF实现了图形编辑器框架，可进行图形的添加，删除与修改。-Use EMF and GEF implement graphical editor framework, you can add graphics, delete and modify.