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分析以下三段AUTOLISP程序,写出每个语句起什么作用?最后该程序完成什么功能?, R; m: ]8 ]- A5 I" d' U
①
8 z$ a) z$ g; O! Z4 x0 X(defun c:erasescr( / l u)
+ Q: a, b4 H# K3 _- \(graphscr)4 j) e [8 T; _+ @% ~
(setq l (getvar "limmin"))
9 @; E9 X7 K/ I, U' j0 T$ p(setq u (getvar "limmax"))
# |' V% p/ \/ i8 v$ ~4 _+ [+ H(command "erase" "W" l u “”)
# w, d# g- ]! a+ h; q) : _5 x1 ]- G" b) g
②
% K6 ^$ g B, G0 ]; y' q) u(defun p3 ( ): f& i& F+ |2 y D8 g
(setq r (getreal “\n number:”))
6 S+ n- f( x" F(setq maxr r minr r)
# {2 M# o8 |7 }& D! `. l' i(while r
7 T0 a% N" Z$ U r9 t6 z$ C$ T' g1 W(if (> r maxr) (setq maxr r)), ^& X* p f4 x$ `( b1 j( O5 @
(if (< r minr) (setq minr r))) J, F, v1 R- q- V0 @0 o: |
(setq r (getreal “\n number<return when done>:” )); K- w5 w9 I `, d
)) L4 R; L2 @' X K+ u! R. V- X+ { h
③
/ t4 s) x9 n2 S3 Z4 s! ?(defun c:akey (/ d h w bp ag p1 p2)" i7 X* V, r7 S2 D# g Z
(setq d (/ (getdist “\n d=?”) 2.0)
' t, F8 {5 x. \, I h (getdist “\n h=?”)
8 P' u# t; s" Z1 A, }w (/ (getdist “\n w=?”) 2.0)) V' O6 U d, j4 I! n v
bp (getpoint “\n center=?”)
+ T" a6 Z1 o% U ag (atan (/ w ( sqrt (- (* d d) (* w w))))))- [ ?3 a& r: l. l. }9 g" b; ]
(command “pline”
}* U$ s6 W/ v* Z' y) o4 O$ \(setq p1 (polar bp (- ag) d))! U) c6 z6 \5 \. t
(setq p2 (list (+ (car bp) (- d h)) (cadr p1)))
# x- T) A: t4 v( H: q% D# Q0 c(polar p2 (/ pi 2.0) (* w 2))
+ k$ [9 S9 a8 p R(polar bp ag d)
( _+ \# p) B6 k“a” “ce” bp p1 “”)" }! f# N+ f' S1 C+ t
(setq ss (entlast))
z) u* J) \! H4 W2 o$ J U1 A(command “hatch” “u” 45 10 “” ss “”)# B6 f2 h2 c8 z; V
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