说明：  一个菜单界面，分别用菜单命令来绘制原数据曲面图，线性插值，最近点插值，3次多项式插值，3次样条插值后的图形，每次插值都可以在同一图形界面下比较插值前后图形。
(A menu interface, respectively, using the menu command to map the original data surface map, linear interpolation, nearest point interpolation, polynomial interpolation 3 times, 3 times after spline graphics, interpolation can be per- under the same graphical interface graphics compared before and after interpolation.)