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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？: U, c2 a1 n' r! O+ H/ h
①% e1 {! }" P1 a1 I9 z
(defun c:erasescr( / l u), H- x& H: I' S8 f0 |
(graphscr)# R# K7 V5 d3 W0 a7 K
(setq l (getvar "limmin"))
* a4 C5 J1 W! |* E7 S(setq u (getvar "limmax"))
6 `0 g* T& C$ t! r- o; I* r4 z(command "erase" "W" l u “”)
4 @8 R5 r4 e# e& M' n8 r/ k)
0 Q* ~% b/ O( }3 f/ ^& c+ @, J②
) i* `) l, R$ F% I1 Q4 v$ Z. C1 R5 a(defun p3 ( )' |" ^% l3 T3 A. m$ E8 Y
(setq r (getreal “\n number:”)), Q" t! Z' R7 e7 U7 H
(setq maxr r minr r)1 m. Z- f, _7 U/ F; k$ S6 ]$ L
(while r0 g( r* e/ \) ~8 L) T: N
(if (> r maxr) (setq maxr r))0 i: z/ z+ y. F s' k/ k% H
(if (< r minr) (setq minr r))3 q! O. h8 _4 v8 x! d" L
(setq r (getreal “\n number<return when done>:” ))
3 ~% ^& H- e0 X))
% U: e' V, {9 O9 R& v/ t③# t7 [7 V; f. B$ A( s
(defun c:akey (/ d h w bp ag p1 p2)4 _7 r* Q- F/ S5 n$ q3 J& x6 u
(setq d (/ (getdist “\n d＝?”) 2.0)
4 M* i. o5 ~) t* G+ `0 J9 m" T h (getdist “\n h＝?”)
# \+ H" ?8 g6 uw (/ (getdist “\n w＝?”) 2.0)
* c9 S8 V O- g; | bp (getpoint “\n center＝?”)
1 n0 R ]' d- t! b: h ag (atan (/ w ( sqrt (－ (* d d) (* w w))))))0 g+ G8 Q2 q% ^1 d, n- {+ s6 m
(command “pline” y" y1 n4 f, X1 o( M' e& S
(setq p1 (polar bp (－ ag) d))- T2 ?1 o* C9 ?
(setq p2 (list (＋ (car bp) (－ d h)) (cadr p1)))/ O7 V! e% s) ^3 I2 ]1 B
(polar p2 (/ pi 2.0) (* w 2)); a$ {% F# |6 b( p
(polar bp ag d)* r1 B" z4 S4 M) Y8 X
“a” “ce” bp p1 “”)
% `: I0 Y& @7 p j(setq ss (entlast))
7 C( Y c* @4 y) K+ `+ Z% X" P8 b(command “hatch” “u” 45 10 “” ss “”)
5 }# x/ y# E7 Z3 C2 `7 j4 i$ G ) |
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发表于 2007-12-28 14:06