很多时候，我们拿到手上的控制点数据均为仪器导出的文本文件，如果我们想要将其展点为CAD格式的文件，则可以利用下面的代码：

;LISP展点程序
;数据文件格式为：每一点的数据（点号、X、Y、H）为一行，用逗号或空格作为分隔符，即
;点号1  X1  Y1 H1   或者 点号1,  X1,  Y1, H1
;点号2  X2  Y2 H2   或者 点号2,  X2,  Y2, H2
;点号3  X3  Y3 H3   或者 点号3,  X3,  Y3, H3
;......
;点号n  Xn  Yn Hn   或者 点号n,  Xn,  Yn, Hn1
(princ "\n提示：数据格式必须为以下两种格式：\n点号1  X1  Y1 H1   或者 点号1,  X1,  Y1, H1，可以无高程数据H，系统用0替换！")
(defun c:zd()
    (setq  ff (open (getfiled "请选择要展点的数据文件" "" "txt;*" 2) "r")
           fhb nil  t0 (getvar "cdate")
           cm (getvar "cmdecho") os (getvar "osmode")
           tcm1 "点号"   tcm2 "点记"
    )
    (setvar "cmdecho" 0)(setvar "osmode" 0)
    (if (= (tblsearch "layer" tcm1) nil) (command "layer" "n" tcm1 ""))
    (if (= (tblsearch "layer" tcm2) nil) (command "layer" "n"  tcm2 ""))
    (while (setq zb (read-line ff))
        (while (vl-string-search "," zb) (setq zb (vl-string-subst " " "," zb)))
        (setq zb  (read (strcat "(" zb ")")))
              ;(setq zb (list (list (nth 1 zb) (nth 2 zb)) (vl-princ-to-string  (last zb))));注记高程
              (if (= (numberp (car zb)) nil)
                (if (not (nth 3 zb))
                      (setq zb (list (append (cdr zb) '(0)) (vl-princ-to-string (car zb))));无高程数据处理
                       (setq zb  (list (list (nth 1 zb) (nth 2 zb) (nth 3 zb)) (vl-princ-to-string  (car zb))))
                   )
                (if (not (nth 3 zb))
                  (setq zb  (list (append (cdr zb) '(0)) (rtos (car zb) 2 0)));提示：无高程数据处理
                  (setq zb  (list (list (nth 1 zb) (nth 2 zb) (nth 3 zb)) (rtos (car zb) 2 0)));提示：注记点号请用该行
                  )
              )
              (setq fhb (append fhb (list zb)))      
    )
    (setq t1 (getvar "cdate"))
    (close ff)
    (setq zb (vl-sort fhb '(lambda (e1 e2) (< (car (car e1)) (car (car e2)))))
          x0 (car (car (car zb)))  x1 (car (car (last zb)))
          zb (vl-sort fhb '(lambda (e1 e2) (< (cadr (car e1)) (cadr (car e2)))))
          y0 (cadr (car (car zb)))  y1 (cadr (car (last zb)))
    )
    (command "zoom" "w" (list x0 y0) (list x1 y1))
    (setq t2 (getvar "cdate"))
    (foreach zb fhb
        (setq zfc (last zb)
              ;pt  (mapcar '+ (car zb) '(1.5 -1.25));这行改为如下
              pt  (car zb) 
        )
        (entmake (list '(0 . "TEXT") '(100 . "AcDbEntity") '(100 . "AcDbText") 
         '(62 . 1) '(40 . 20) '(50 . 0.0) 
          ;(cons 8 tcm1)   (cons 1 zfc)  (cons 10 pt);这行改为如下
          (cons 8 tcm1)   (cons 1 zfc)  (cons 10 (mapcar '+ pt  '(1.5 -1.25)))
                  )
        )
        (entmake (list '(0 . "POINT") '(100 . "AcDbEntity") '(100 . "AcDbPoint")
         '(62 . 2)
          (cons 8 tcm2)  (cons 10 pt)
                      )
        )
    )
    (setq t3 (getvar "cdate")
        dt1 (* 1000000 (- t1 t0))
        dt2 (* 1000000 (- t3 t2))
    )
    (princ (strcat "\n读入数据共耗时：" (rtos dt1 2 3)"秒，展点共耗时" (rtos dt2 2 3) "秒，展点数：" (itoa (length fhb))"个，每展一点耗：" (rtos (/ dt2 (length fhb)) 2 10) "秒！"))
    (setvar "cmdecho" cm)
    (setvar "osmode" os)
    (princ)
)