绘图板系统。实现文件是Draw.c，因为涉及到了图形界面，所以使用Turbo C工具来调试。在运行时，必须将EGAVGA.BGI文 件、.EXE可执行文件和程序文件放在统一目录下。-Drawing board system. The file is Draw.c, because it involves a graphical interface, so the use of Turbo C tools to debug. At run time, must have the EGAVGA.BGI file,.EXE executable files and program files on a unified directory.