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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?( z2 _$ p' A3 b- F, W0 o
①& H% `1 v2 V) ^ k4 d# E6 X
(defun c:erasescr( / l u)- ~9 K) x+ d8 M3 [+ m
(graphscr)
. M' a( }6 J I9 s9 @(setq l (getvar "limmin"))
# `. Q1 O+ l1 q! H/ p4 E(setq u (getvar "limmax")) D4 ^: o7 H# p1 E. y9 J' K$ W4 x
(command "erase" "W" l u “”)
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(defun p3 ( )
0 E5 V5 Z. h, B; \, S(setq r (getreal “\n number:”))4 X8 c! I9 }) C# ~. ]* M! J
(setq maxr r minr r)
: r* }( y, b2 z' j: R/ W* {(while r
' Q! [8 B4 g3 W; A(if (> r maxr) (setq maxr r))2 o' {! Y' x& A8 y, r# c. Y
(if (< r minr) (setq minr r))
. @+ U+ n. N7 A [% Z7 o(setq r (getreal “\n number<return when done>:” ))
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③
7 |2 ]/ F7 R) }% I' }) I(defun c:akey (/ d h w bp ag p1 p2)
- O4 A9 p6 h/ t3 s; P6 W* E(setq d (/ (getdist “\n d=?”) 2.0)
3 O5 U( O: }$ y# G/ |. k h (getdist “\n h=?”)
/ @1 E2 { I( W+ N4 ew (/ (getdist “\n w=?”) 2.0)" T* E: J M) \6 w; X
bp (getpoint “\n center=?”)4 B8 c1 W3 |( w) B- n" U$ Q
ag (atan (/ w ( sqrt (- (* d d) (* w w))))))7 c0 K G" }! K g& q
(command “pline”6 F5 B( w/ @$ L8 I/ B: h
(setq p1 (polar bp (- ag) d))* q: j: @% @7 R1 U
(setq p2 (list (+ (car bp) (- d h)) (cadr p1)))
: w) @; x( _ u, x# s(polar p2 (/ pi 2.0) (* w 2))
: ` `& G0 f/ [% S# t( h6 i; E* |(polar bp ag d)& \% Y$ j% C5 H6 o( }
“a” “ce” bp p1 “”)
" D7 o$ _& B1 w3 k(setq ss (entlast))8 D8 U$ U$ y" x4 B- A2 T5 A
(command “hatch” “u” 45 10 “” ss “”)
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