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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？: d" \8 g! ~% X' q1 G- x$ k
①
4 g3 g# l. q, E" `(defun c:erasescr( / l u)) s/ o( D" J/ m; i+ G% |2 I# v& Q
(graphscr)
2 s N# }9 ?0 Z(setq l (getvar "limmin"))! v- ?; z( I- ?6 d, e1 \
(setq u (getvar "limmax"))2 l5 f% z4 @" i+ b$ T2 u
(command "erase" "W" l u “”); J2 D& m" \$ h+ y5 R$ m: G( W
)
6 _ g( m; E: r9 H7 C/ q②+ |1 M5 @2 I+ `8 y# @. o2 K) }
(defun p3 ( )+ B0 w% W/ q u1 e4 c8 n/ H. i
(setq r (getreal “\n number:”))5 _/ K2 _/ S; k( M p& L( }3 S5 Q
(setq maxr r minr r)5 y. l/ t6 O1 _5 y2 l) ]# ]% x
(while r
, A" y$ P Q2 |/ K' l(if (> r maxr) (setq maxr r))) U5 D$ e4 c* w, n
(if (< r minr) (setq minr r))
- |7 E4 c Q% h {! \6 Z(setq r (getreal “\n number<return when done>:” ))& O3 P* g w: k' x7 x2 {
))
; ]; ?+ S, Q3 \1 ?' H③
- w2 D/ J7 W- R% t4 p+ Z(defun c:akey (/ d h w bp ag p1 p2)# [/ Q* L' O" S
(setq d (/ (getdist “\n d＝?”) 2.0)6 Z# f- {1 a7 u- u6 _
h (getdist “\n h＝?”)
: }3 y/ d1 Z; n- R, ?7 ow (/ (getdist “\n w＝?”) 2.0)
2 E* X7 U; j9 U, K6 ^ bp (getpoint “\n center＝?”) ?, {/ p6 r- n
ag (atan (/ w ( sqrt (－ (* d d) (* w w)))))), Z' i- [3 O* c* M; _8 d1 g
(command “pline”
9 k/ E/ q V6 p2 d8 ^. d+ _, Q(setq p1 (polar bp (－ ag) d))
J: Z% |# ^0 t(setq p2 (list (＋ (car bp) (－ d h)) (cadr p1)))" T) V8 _6 A" l6 b S0 M: ]
(polar p2 (/ pi 2.0) (* w 2)); q) Z+ [" e, p% m4 E
(polar bp ag d)! e; V: l3 ~4 W" P A* [
“a” “ce” bp p1 “”)
: q6 [/ D5 s& c* _) `(setq ss (entlast))( e' ~# p3 ]0 L4 O1 a8 m# _
(command “hatch” “u” 45 10 “” ss “”)4 g4 \6 p4 p/ D" K
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发表于 2007-12-28 14:06