此程序的主要目的就是利用键盘实现对3D图形的旋转、移动、放大等操作。控制键为SHIFT、CTRL、HOME、END、VK_UP、VK_DOWN VK_LEFT、VK_RIGHT.-The main purpose of this procedure is to use the keyboard to achieve the rotation of the 3D graphics, move, zoom and other operations. Control keys for the SH