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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？
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, R9 K! n* Z' u6 f$ ~(defun c:erasescr( / l u)
- i( d" r6 l, u+ J0 O(graphscr)
( z7 Y4 A- A; o& {' `; y& o/ k(setq l (getvar "limmin"))
( ^; s% Z. [: \! c( C q" e(setq u (getvar "limmax")). a r }$ f; y J3 `' K7 g+ [
(command "erase" "W" l u “”)
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②
% `, k# I! q! z$ u$ t: ~& z(defun p3 ( )
% i0 \$ R8 W N' E. ~(setq r (getreal “\n number:”))
% y" I4 r2 p0 ^" m* M* e(setq maxr r minr r)$ p0 {- }' d+ V2 \
(while r% B0 i4 _7 \0 }9 u( W V$ m2 [' V
(if (> r maxr) (setq maxr r))+ A# ?: t% \8 i) x) ~
(if (< r minr) (setq minr r))1 F; k, k6 ?1 E _& I0 |
(setq r (getreal “\n number<return when done>:” ))
, a2 E q) k0 e# p5 [. y))
/ ]# Y( c+ ~3 Y6 R% O③
0 D. y. N% R: j3 e) A7 ?1 L(defun c:akey (/ d h w bp ag p1 p2)
! u- N+ |3 N9 c! q8 l* d/ g# M(setq d (/ (getdist “\n d＝?”) 2.0)
R7 Z# _8 l0 [4 S+ k h (getdist “\n h＝?”)
- Z2 ]4 P: h5 h( |+ M# u) Tw (/ (getdist “\n w＝?”) 2.0)' H9 z- g/ F/ x
bp (getpoint “\n center＝?”). }/ L' F) B' D4 X9 k
ag (atan (/ w ( sqrt (－ (* d d) (* w w))))))1 A4 V" n" D- S% h) R4 d
(command “pline”) W4 s. z6 x& w7 S1 Q: \
(setq p1 (polar bp (－ ag) d))
! k2 }8 E3 Q. u8 X" t: ~% v(setq p2 (list (＋ (car bp) (－ d h)) (cadr p1)))* `+ \) e- Z# J- J
(polar p2 (/ pi 2.0) (* w 2))! }$ S( J/ A! ~" D* z2 X; Y
(polar bp ag d)
, N6 u; ~ g% p) W“a” “ce” bp p1 “”)/ d2 q: h" P) X, B# c Z0 s
(setq ss (entlast))
$ _, O" d1 c8 H( U(command “hatch” “u” 45 10 “” ss “”)- u5 Q& k( M$ M* o3 L" R0 L
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发表于 2007-12-28 14:06