说明：  以SetPixel()基础，从图形的变换，到图元的填充，讲述了三维图形的大概生成和显示流程．程序中涉及到的图形剪裁和消隐，使用的是简化的．有待完善．仅供学习所用．
(To SetPixel () the basis for the transformation from the graphics to the graphic element of the filling, about the approximate three-dimensional graphics generation and display process. Procedures involved in tailoring and blanking graphics, using a simplified. Remain to be improved. Used for learning.)