此问题由闫新海回答。 附加关键字：编程, 源程序, programming, source code, C/C++, MFC, C++ Builder, Borland C++, Turbo C, C, BCB, Visual Basic, VB, 图形、图象, picture, graph, image, draw。
附加关键字：编程, 源程序, programming, source code, C/C++, MFC, C++ Builder, Borland C++, Turbo C, C, BCB, Visual Basic, VB, 图形、图象, picture, graph, image, draw。
绘制等高线的例程或ocx控件
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