画图版，链表功能。undo，redo 实现文件的存取Open、New、Save、SaveAs 建立类，shape rectangle，circle，line类 -Paint version feature list. undo, redo implementation document access Open, New, Save, SaveAs type set up, shape rectangle, circle, line type

编辑空间数据，实现对图层节点操作，增加删除修改等-GISeditor use AE，toolbar has undo，redo，save，look up the attribute