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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？
& o1 ?/ u. ?7 s7 c①
/ R% E1 [ Y; O& r3 ?. _(defun c:erasescr( / l u)
( r0 I% Y* g% M- U0 F) m( K(graphscr)" n# b7 Q9 K2 g8 w, _4 K
(setq l (getvar "limmin"))& o3 w. L0 P% E; `
(setq u (getvar "limmax"))
! _* s' [8 \3 k. n/ _(command "erase" "W" l u “”)
4 u+ G' c2 M% ]( ?6 S" e5 B) : X" j! v9 ?! @4 h* b. b% C
②$ u; A+ |) B J1 o2 A
(defun p3 ( )
$ `2 K; p- x; B(setq r (getreal “\n number:”))& ]/ T' J$ T1 n3 Q: f" f5 J
(setq maxr r minr r)
% Z8 o* C0 `8 H9 F* w7 K, P% T(while r, d' p/ e) l- }8 i' Q
(if (> r maxr) (setq maxr r))$ F/ p' E1 ]# b% D; T$ A- ?/ [
(if (< r minr) (setq minr r))' l7 A1 M6 k+ b+ T8 C& v" x8 J; b
(setq r (getreal “\n number<return when done>:” ))
0 q( L5 j% ]: z)) ) X8 c- E0 i/ h" h4 Z. G/ K/ T
③2 F- L6 l8 P$ x u% d
(defun c:akey (/ d h w bp ag p1 p2)
6 ~4 S* E: ]0 p2 ?7 n e(setq d (/ (getdist “\n d＝?”) 2.0)
2 _! T" g* v3 F+ k h (getdist “\n h＝?”)
3 q& U ~7 `' K1 Z" ew (/ (getdist “\n w＝?”) 2.0)& n9 a# v$ }+ M
bp (getpoint “\n center＝?”)
2 m; |' _! f7 d6 O3 q' P' o ag (atan (/ w ( sqrt (－ (* d d) (* w w))))))* M* v2 h" t0 k/ c9 V- h9 N/ M
(command “pline”. ~- s! E% T3 C2 `
(setq p1 (polar bp (－ ag) d))
+ p" S2 K+ R: i; y(setq p2 (list (＋ (car bp) (－ d h)) (cadr p1)))2 x: C, U, u* a
(polar p2 (/ pi 2.0) (* w 2)), N/ B4 s, ^- K, l8 I |1 z: @
(polar bp ag d)* g8 x) s/ y+ P: `
“a” “ce” bp p1 “”)
* ] Q9 {: G* P7 d(setq ss (entlast))& S$ M0 |# _1 q9 w. F3 h6 C
(command “hatch” “u” 45 10 “” ss “”)
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发表于 2007-12-28 14:06