关于多义线的画法
;如何从图1（最左边）中，选取点A与点B 变成一个封闭的多义线如图2; 再者，在图3，从A点开始顺藤摸瓜式的到点B 再选择方向，或反方向，求出各点的坐标，最后返回A点，也要算，然后写出到
;;文件
;以下代码是我抄书上的多义线输出坐标点，但不能让开始点由我选择，望高手改进
(defun c:pepo()
(setvar "cmdecho" 0)
(setq ffn (getfiled "选取文件" "" "txt" 1))
(setq ff (open ffn "w"))
(close ff)
(princ "\n选取PLINE多义线...")
(setq ss (ssget))
(setq i 0)
(setvar "pdmode" 33)
(repeat (sslength ss)
(setq ssn (ssname ss i))
(setq endata (entget ssn))
(setq n 0)
(repeat (length endata)
(setq pp (nth n endata))
(setq key (car pp))
(if (= key 10)
(progn
(setq x (cadr pp))
(setq y (caddr pp))
(command "point" (list x y))
(setq ff (open ffn "a"))
(princ x ff)
(princ " " ff)
(princ y ff)
(princ "\n" ff)
(close ff)
)
)
(setq n (1+ n))
)
(setq ff (open ffn "a"))
(princ "End\n" ff)
(close ff)
(setq i (1+ i))
)
(princ (strcat "\n文件写至=> " ffn))
(prin1)
)
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