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

Google地图勾经纬度工具,使用方式:点击画线后点击鼠标进行选点,选点后会打印点击的坐标点并画线,可以撤销和清除画线-Google Maps latitude and longitude hook tool, click the mouse to draw a line and click on the choice of site, will print the selected point coordinates of the point and click to draw lines,

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