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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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(defun c:erasescr( / l u)+ Q k; M- r/ a4 ~2 t3 b
(graphscr)
, v/ a; p3 l. _# N0 n) O(setq l (getvar "limmin"))$ k' Y% e5 F9 G2 D
(setq u (getvar "limmax"))' F# w) v! `, Z8 G- A
(command "erase" "W" l u “”)$ D" Y7 ~/ w4 o' R
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(defun p3 ( )
. F6 _- |. f, L1 _) B6 E) Y- ~(setq r (getreal “\n number:”))2 C# w0 G/ N+ [7 e; @ b
(setq maxr r minr r)+ i$ K0 b$ _ D, {( |+ D0 t* |, T* S
(while r
5 X. S8 f; t, z7 x/ F8 }: i(if (> r maxr) (setq maxr r))
' j3 v3 G6 l7 O- ]7 V3 k(if (< r minr) (setq minr r))+ D! U+ P5 F* Y7 g
(setq r (getreal “\n number<return when done>:” )): r/ D1 Z6 v& @: o! o) D ?
))
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8 [" m9 h$ _5 T e(defun c:akey (/ d h w bp ag p1 p2)" I5 T) b! H/ d0 o4 `5 t% p7 e! y
(setq d (/ (getdist “\n d＝?”) 2.0)8 J! x. _: P; t4 x) W
h (getdist “\n h＝?”)/ d0 i* Z9 H i+ f7 |- b g
w (/ (getdist “\n w＝?”) 2.0)
" d4 E/ L6 P& S, J9 c/ e bp (getpoint “\n center＝?”)
& a# L/ K2 `7 k ag (atan (/ w ( sqrt (－ (* d d) (* w w))))))
; n3 W$ D$ f6 i2 {$ |(command “pline”& y" I& n( k& b
(setq p1 (polar bp (－ ag) d))7 X/ M) d% P3 {, J1 L- \; C
(setq p2 (list (＋ (car bp) (－ d h)) (cadr p1)))* E+ N( E) Z+ P1 g1 i
(polar p2 (/ pi 2.0) (* w 2))
) D" ]0 e' M5 A2 D(polar bp ag d)
1 w1 A3 m G. u! o“a” “ce” bp p1 “”)
e3 F. J" E. J$ _$ Y1 J(setq ss (entlast))8 E3 {% j. d/ K2 R& R1 e; Z, y
(command “hatch” “u” 45 10 “” ss “”)
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发表于 2007-12-28 14:06