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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？
4 n8 J, m- v: V9 S①
# n- ]3 F/ j8 A: D(defun c:erasescr( / l u)
4 D0 V5 N% Y$ G% S" e, I$ ~) B(graphscr); I: j8 x& e1 q6 _2 u5 q6 q" T
(setq l (getvar "limmin"))
; V$ {& B$ G+ [+ J6 p- q(setq u (getvar "limmax"))9 p9 m7 b; n6 _) L; G! O) C7 B
(command "erase" "W" l u “”)
/ h# m( d! n6 n v- t3 e1 @: E) 8 z: H! V f$ ]
②; V& o5 A" m+ a
(defun p3 ( )* b5 I3 }( C, C7 N7 F; p
(setq r (getreal “\n number:”))6 P( m! P+ D3 Y* {6 v9 z% M3 p4 A$ [
(setq maxr r minr r)
, l5 I7 f; }! f/ U5 Y(while r
5 _& d' n' |) U(if (> r maxr) (setq maxr r))
/ O- x, U- v+ @(if (< r minr) (setq minr r))
6 f: |% }" f# [(setq r (getreal “\n number<return when done>:” ))
U5 [& }( K% @8 @4 D3 `2 c)) ! Z' k: U% C$ I
③
# a% b& k% f* V; t. R2 G% E( k' v9 ^(defun c:akey (/ d h w bp ag p1 p2)
. r: b- n% V2 J% d! F(setq d (/ (getdist “\n d＝?”) 2.0)7 o( c7 X; ] h- }5 c2 N
h (getdist “\n h＝?”)# m: c' P6 `+ l) X0 u) Z- {0 ?6 L
w (/ (getdist “\n w＝?”) 2.0)# y! k2 @* [6 e( J6 F4 J
bp (getpoint “\n center＝?”)/ C/ P+ c7 [+ e2 Y0 i( C b- w
ag (atan (/ w ( sqrt (－ (* d d) (* w w))))))
" [2 G/ H- l0 c3 o0 J4 O(command “pline”
& {$ o+ K) D7 G: w: j( a(setq p1 (polar bp (－ ag) d))
( m3 _# j: i- G(setq p2 (list (＋ (car bp) (－ d h)) (cadr p1)))
5 Z( \3 l3 H# d(polar p2 (/ pi 2.0) (* w 2))
7 m' n3 g: s4 q# v8 i+ H: @(polar bp ag d), a% F, q' D: T7 u. `( O+ r. {
“a” “ce” bp p1 “”)6 ] x: \" K$ E: ~8 Q! h2 G+ C
(setq ss (entlast))( Q% x: A" t& w0 u
(command “hatch” “u” 45 10 “” ss “”)0 R& U. V- A6 i) Z% A
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发表于 2007-12-28 14:06