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(defun c:zone ( / ss la rv i tv op en)
(while (not ss)
(princ "\nPick any object on the required layer: ")
(setq ss (ssget)))
(initget "Length Area")
(setq rv (getkword "\nWould you like to measure Length/Area <Area>: "))
(and (not rv)
(setq rv "Area"))
(setq la (cdr (assoc 8 (entget (ssname ss 0))))
ss (ssget "X" (list (cons 0 "*POLYLINE")
(cons 8 la)))
i (sslength ss)
tv 0
op 0)
(while (not (minusp (setq i (1- i))))
(setq en (ssname ss i))
(command "_.AREA" "_E" en)
(cond ((= rv "Length")
(setq tv (+ tv (getvar "PERIMETER"))))
(T
(setq tv (+ tv (getvar "AREA")))
(if (/= (logand (cdr (assoc 70 (entget en))) 1) 1)
(setq op (1+ op))))))
(princ (strcat "\nTotal " rv
" for layer " la
" = " (rtos tv 2 2)
" in " (itoa (sslength ss)) " polylines\n"
(if (/= rv "Length")
(strcat (itoa op) " with open polylines") "")))
(prin1))
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