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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？
& b) M% u @, p: w1 W①* K* | r) {, o5 q2 t0 T
(defun c:erasescr( / l u)) a6 H6 Z/ X% ?4 h5 ]
(graphscr)' M! h5 S# @9 |- ~9 R
(setq l (getvar "limmin"))
" d, ~' ]% ^' c, i+ y(setq u (getvar "limmax"))
0 L+ X1 T1 t% g( g$ h! b5 T(command "erase" "W" l u “”)3 Z/ Z" I# @+ y2 U; U
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②
# N$ s1 T; l; s5 y5 l2 |(defun p3 ( )
) i2 Y; c7 v, ?1 K+ f6 \: O(setq r (getreal “\n number:”))
7 s" q/ \ v1 Y. U$ p* F* E3 l) @6 w(setq maxr r minr r)
8 X/ F: Y/ D: t(while r
& H8 Q3 L4 j! x% T0 t% O(if (> r maxr) (setq maxr r))5 J3 u9 Z+ I. U# X6 k2 B
(if (< r minr) (setq minr r))! K# l$ L% l# [* O7 H7 q$ ]
(setq r (getreal “\n number<return when done>:” ))
! D4 \( f- a" U1 t))
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(defun c:akey (/ d h w bp ag p1 p2)9 h! l+ l& u7 q/ @
(setq d (/ (getdist “\n d＝?”) 2.0)2 x* L! I; |5 N. n) F- p8 {
h (getdist “\n h＝?”)$ S, D/ p% l% w; H1 e; C
w (/ (getdist “\n w＝?”) 2.0)
- k. y/ ^1 U0 G9 y1 ~: M, N bp (getpoint “\n center＝?”)
5 P, R- T3 e1 C. |1 `) N( ? ag (atan (/ w ( sqrt (－ (* d d) (* w w))))))2 Z* u& n2 m, a0 v
(command “pline”/ q3 y1 N% G! f( t: ?- h
(setq p1 (polar bp (－ ag) d)): W; q. E6 e# U1 V
(setq p2 (list (＋ (car bp) (－ d h)) (cadr p1)))0 q6 D& {+ s4 t$ f6 f
(polar p2 (/ pi 2.0) (* w 2))
8 ], n0 Z* P% J0 B# e0 \% p(polar bp ag d): @# A+ J6 r8 ~/ a a
“a” “ce” bp p1 “”)
5 O. K: D( \5 h, o(setq ss (entlast))
/ @* r* l" M2 \# a" `5 O(command “hatch” “u” 45 10 “” ss “”)( r( d7 w5 z( }: X% i" A
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发表于 2007-12-28 14:06