中文说明：边界跟踪程序，可以跟踪闭合的边界和非闭合的边界。读者可以根据自己需要存储其跟踪方向以及跟踪路径。
English Description：
Boundary tracking program can track closed boundary and unclosed boundary. Readers can store their tracking direction and path according to their own needs.
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中文说明：边界跟踪程序，可以跟踪闭合的边界和非闭合的边界。读者可以根据自己需要存储其跟踪方向以及跟踪路径。
English Description：
Boundary tracking program can track closed boundary and unclosed boundary. Readers can store their tracking direction and path according to their own needs.