cad加载后使用，结合文件线型面积.lin，可以根据具体线型自动计算面积，含全算及半算。前提是提前圈好面积线，且赋值好线型！命令为：TJMJ-cad after loading using a linear combination of the file area .lin, according to the specific line automatically calculate the area, including a full count and a half count. The p