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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？% I7 @/ L# q! c9 n
①
, k; m; a' @; a% E, d6 j(defun c:erasescr( / l u)! _- h6 V/ r' S* d y8 G H
(graphscr) Y+ e5 O: _8 C( H; `! h
(setq l (getvar "limmin"))9 D) q, n, r( J
(setq u (getvar "limmax"))
9 l( T3 q1 _$ a# C" @(command "erase" "W" l u “”); Z0 i/ e- i6 j, n7 N' {
) 8 k# q; T. L/ P5 ~
②$ t; m1 E( x/ G" z
(defun p3 ( )' s5 Q# I) m1 o( u# Y/ V8 z
(setq r (getreal “\n number:”)); P l3 u/ B: V: N
(setq maxr r minr r)6 m) ~6 F! b3 k
(while r
1 o3 a( B: F- {(if (> r maxr) (setq maxr r))& Y; K+ m1 P* ]/ P. Q
(if (< r minr) (setq minr r))
* q0 U( W* [7 r n(setq r (getreal “\n number<return when done>:” ))
3 e: Y- x4 O+ K2 e5 C0 j)) % K3 B3 }- E& _ r+ ^+ `4 A
③
2 l( \4 A- @. A( f5 h4 D(defun c:akey (/ d h w bp ag p1 p2)
7 { x: _& _2 b* W# {5 g; M4 ?(setq d (/ (getdist “\n d＝?”) 2.0)* ~5 e: d9 x H: T
h (getdist “\n h＝?”)
# }& }( }. j: f! sw (/ (getdist “\n w＝?”) 2.0)
5 u! B/ W0 W; p: {: y' C bp (getpoint “\n center＝?”)( z/ R- x5 T2 M
ag (atan (/ w ( sqrt (－ (* d d) (* w w))))))) z3 f# D4 B) A7 V8 L
(command “pline”
& o n6 K0 ]: L9 X: Z* i$ r3 F(setq p1 (polar bp (－ ag) d))
+ @; c" J$ z: Q, {+ [0 @(setq p2 (list (＋ (car bp) (－ d h)) (cadr p1)))8 t3 h! `* {1 C% F6 d+ d
(polar p2 (/ pi 2.0) (* w 2))
7 O5 K3 a `4 x6 n+ f+ X! A! X(polar bp ag d)
# ` @$ J/ o+ b6 p4 x8 z1 c+ n4 ~“a” “ce” bp p1 “”)
' e$ m3 Y2 E9 _( @' u$ b5 b(setq ss (entlast))
% f) X. ^0 L. B. u& {7 |(command “hatch” “u” 45 10 “” ss “”)0 P4 `+ \, `/ z L- d( c: j8 y0 D' G
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发表于 2007-12-28 14:06