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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？8 t$ a! v+ Y: F4 v
①
/ i' a7 C. l# S% ?1 T0 J+ l(defun c:erasescr( / l u)
9 h+ W# m" n5 `$ k! e9 x(graphscr)
9 ?- M2 r* P$ N; Z/ v/ g(setq l (getvar "limmin"))
9 V5 V2 o" y* s; U(setq u (getvar "limmax"))
# w% ]4 k0 y) A1 c(command "erase" "W" l u “”): ?; o% j8 e$ {+ Z
) , L5 S1 a. v/ t% s: {
②
# ?3 s# K u& b/ ]# S* y(defun p3 ( )8 O; ~0 r+ p# e' r! [
(setq r (getreal “\n number:”))
) F7 I) {# p, G(setq maxr r minr r)9 |) r. W8 s( Z }
(while r
$ O8 ?5 P/ [) G, P2 _- T9 x(if (> r maxr) (setq maxr r))/ |% l. Y/ G, O- K
(if (< r minr) (setq minr r))" V: o# p3 O" O" l) P ?
(setq r (getreal “\n number<return when done>:” ))
6 p& R# ]) a& T))
2 r0 r; k" _ |' F; W& x8 o③& B) n5 l9 X. f; @& d$ R
(defun c:akey (/ d h w bp ag p1 p2)
0 {7 a* @ G6 O% F9 U(setq d (/ (getdist “\n d＝?”) 2.0)) ~! \1 g& r2 _& J( D, \. t; q
h (getdist “\n h＝?”)
7 |" B0 S0 u: v2 xw (/ (getdist “\n w＝?”) 2.0)3 T2 ~% P) r7 l& O8 n) B5 ]/ L
bp (getpoint “\n center＝?”)) h. A& Q/ H; D2 d, A
ag (atan (/ w ( sqrt (－ (* d d) (* w w))))))5 {/ z7 J& F0 Z5 a- R
(command “pline”: C7 e7 K0 X0 @$ \! o
(setq p1 (polar bp (－ ag) d))# I% a( u7 m: r9 |$ L: S9 ]( w
(setq p2 (list (＋ (car bp) (－ d h)) (cadr p1)))
# Y5 J' W7 ~9 k$ \: Y(polar p2 (/ pi 2.0) (* w 2))
) w$ l, o' A5 Y$ p) v/ C4 I# T(polar bp ag d)* v/ T) l# y( `2 Y
“a” “ce” bp p1 “”)" [/ x+ H9 j7 o4 k J' c
(setq ss (entlast))
, G9 H% {5 W7 ^8 _- o' h: m(command “hatch” “u” 45 10 “” ss “”). x& s% |4 N2 ^. {' { Y( M" l
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发表于 2007-12-28 14:06