说明：  autocad二次开发， 含lisp源码 及演示 选择一个或多个填充,要求被选择的填充颜色自动变成251,然后统计所选填充的面积,并将总面积写在屏幕上,即text在屏幕上.
(autocad secondary development, including source code and demo lisp Select one or more filling, asked to be chosen automatically filled into 251 colors, and then fill the selected area of statistics, and the total area to write on the screen, that text on the screen on.)