这是一个做美国国旗的程序，可以实现国旗的票动效果-This is a flag of the United States to do procedures, the national flag can be achieved dynamic effects of votes

画美国国旗，和中国国旗，都是标准尺寸。还可以画直线，并且可以把直线用拖拉鼠标的方法放大-painting the American flag and the Chinese national flag, is a standard size. Can also painted straight lines, and can be used straight-line method tractor Mouse Click

包含26幅电子海图（美国部分水域）000.格式的。使用YimaEncViewer软件可以打开。-Contains 26 electronic chart (part of the waters of the United States) 000. Format. YimaEncViewer software can be used to open.

Xu在美国博士期间研究的GVF的源代码,in matlab(GVF source code from Dr. Xu in American)