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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？" K' y9 x- S7 _0 {* d0 h0 w* {/ y
①
- t! b! a. Z* g(defun c:erasescr( / l u)
/ Y8 b, B6 @( A1 D ]1 z0 f(graphscr)
. t7 R) J- }. K6 c& R(setq l (getvar "limmin"))
/ u; p6 ~5 v% r5 p0 H(setq u (getvar "limmax"))
' n1 ?2 }% I$ | k(command "erase" "W" l u “”)+ h- i1 T6 Y O, R. U! \$ L, B
) & T- e7 Q- `# r% f! C
②8 v1 w6 d! M, T5 Q
(defun p3 ( )
' }5 |0 _ `6 ^6 z: _(setq r (getreal “\n number:”))' d, p' i% a$ T5 U6 d* ~8 F# i5 R
(setq maxr r minr r)
h- I! A8 @! h' W, d5 y+ I(while r
/ p* @5 X* E( w4 s(if (> r maxr) (setq maxr r))
' r6 h t# R8 [- a% d(if (< r minr) (setq minr r))7 @/ c" L% {! k5 y
(setq r (getreal “\n number<return when done>:” ))& v4 y5 Q& }) L" @! A
)) & H% P$ z5 d; i9 E
③
; G: w1 K: i; o- i7 G" a3 b# ^(defun c:akey (/ d h w bp ag p1 p2)5 x9 |8 H2 I% m, p/ L
(setq d (/ (getdist “\n d＝?”) 2.0)
% s! ~- M) y% E: j/ e# s7 W h (getdist “\n h＝?”)/ d. n, u0 a( F2 G
w (/ (getdist “\n w＝?”) 2.0)# H) y/ Z! Y! Y) U5 e
bp (getpoint “\n center＝?”)* T! V5 p/ F% {6 c# x) Q9 r
ag (atan (/ w ( sqrt (－ (* d d) (* w w))))))
" }. z3 n6 \0 |(command “pline”, E! J+ D$ r/ A3 ]; y6 M( h
(setq p1 (polar bp (－ ag) d))1 m$ _' B. B, X
(setq p2 (list (＋ (car bp) (－ d h)) (cadr p1)))! }4 c% z% C) q$ W4 a
(polar p2 (/ pi 2.0) (* w 2))
" D: u9 `/ ~ a$ t, W(polar bp ag d)
8 q7 Q) i$ G. R ?8 |“a” “ce” bp p1 “”)
. \" ]3 a8 g( E. ]. T$ H(setq ss (entlast))
: F' \* g9 d) S, R; @* w: _/ f(command “hatch” “u” 45 10 “” ss “”), ^! r- G! a/ S* _; h1 ~" P) Z: ^
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发表于 2007-12-28 14:06