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

从数据库中读取经纬度数据，然后修改Shape文件，在图层中添加点Feature数据，适合需要绕过ESRI产品，直接修改Shape文件的场合。代码是自己写的，不是网络拷贝。-Read latitude and longitude data from the database, and then modify the Shape file, add the points in the Feature data layer, for to go to ESRI products, Shape file