OpenGL提供了一系列的辅助函数，用于简化Windows操作系统的窗口操作，使我们能把注意力集中到图形编程上，这次试验的程序就采用这些辅助函数。-OpenGL provides a series of auxiliary functions for the Windows operating system to simplify operation of the window, so that we can focus on the graphical programming of the test procedures on the use of these auxiliary function.