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发表于 2009-6-23 14:14:39
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来自： 中国江苏无锡
这个问题看见好几次了。呵呵，我也在贴一次，模拟拉伸逼近。1 M& E" H7 R" C
上次看成弧长弦长了，现在搞好了~~
" r+ @8 a% Z$ {+ f& ]7 V(defun c:aaa()! X* W- S3 S0 M- }% E2 C
(setq L1 (getreal "弧L1="))6 r: j% ]/ P, {; m8 B
(setq L2 (getreal "弦高L2="))4 J& O% R2 b: o4 Q& {# }7 }* r
(setq PT1 (list 0 L2))! m: b" h7 n, S' G& X; h
(setq Ln (/ L1 2))3 G0 [' ^: n4 U9 |4 i
(setq jd (/ L2 50))
- X" Y# n- m. H! q! }8 X1 |( v (setq Lxx (+ L1 100))4 r, p' ~/ A" p0 X9 L q: A6 s
(while ( or (> Lxx L1)
% V# ^# J' y% k (< Ln 0.1)2 a M$ ~+ V9 ^6 u+ f: J
)
- H9 C. {: O3 @1 b" d (setq PT2 (list (- 0 Ln) 0))
! n5 l& J. L0 M0 H5 _4 h1 U (setq PT3 (list Ln 0))5 p; d) B8 `1 Q. _ l) P
(command "arc" "none" PT2 "none" PT1 "none" PT3)
) ~; K2 z; N9 |3 O6 s+ n A (command "lengthen" (entlast) "")
; g% n* ?4 ~2 N* e# B+ T (setq Lxx (getvar "perimeter"))2 T1 S* o& }* E2 q$ l
(setq Ln (- Ln jd)) 4 g6 D4 l6 x9 n4 `: y: d/ [
(command "ERASE" (entlast) "")
% X. U# E% c* E1 Y6 q6 ~, U( Q: ]. f )- ^, q. l# x$ t
;;;------------------( t" R. n1 ^8 c
(setq i 10)
$ m6 w% x9 F" m+ x; O3 Z(repeat i
, k6 T( \$ w( b- T1 N$ o+ u (setq Ln (+ Ln (* 2 jd)))) U- h% c# _: ~& E
(setq jd (/ jd 10))/ C9 G3 ^% \! _ k. a) W
(setq Lxx (+ L1 100)), F5 x% [# i) }7 {5 @) c" v6 T% }8 O
(while ( or (> Lxx L1)
' K B7 m, s6 ~+ {" c5 V% i (< Ln 0.1)9 R$ `* W: Z" A; v4 \& ~* L
)8 o) ]3 m5 Y# Q8 ]: f* y
(setq PT2 (list (- 0 Ln) 0))
6 |& N8 u4 a/ _" w0 k! q) o (setq PT3 (list Ln 0))
# t' p/ o% o8 g3 h4 f (command "arc" "none" PT2 "none" PT1 "none" PT3)+ ?3 t( e2 T6 N: Y8 J4 E
(command "lengthen" (entlast) ""); F4 u9 q/ r; a2 P( N c
(setq Lxx (getvar "perimeter"))
0 {, |6 Y5 y; h. n4 p (setq Ln (- Ln jd)) . S0 f v4 N" y4 j, }; l- _3 m# y
(command "ERASE" (entlast) "")! s$ H3 z5 L) c( x0 F' Y
)8 z8 g: a4 U$ o% p0 P# K
)6 k( W, s/ X; r: D: k
" ^ U" f) [6 j$ m- i1 P/ \
;;;------------------
% f( Q. s m& E. ~/ b (setq Ln (+ Ln (* 2 jd)))0 l' _( m% \5 p3 a6 n( v; l
(setq jd (/ jd 50))
9 r% O3 b! x8 e# n0 b (setq Lxx (+ L1 100))
. q! V8 \0 C- }( }0 i% p+ F (while ( or (> Lxx L1)* \" x5 |& ^# R9 X3 K
(< Ln 0.1)
' Y6 x7 M2 b' E; l& b3 P7 K5 C )$ [. F$ j# j" P+ k
(setq PT2 (list (- 0 Ln) 0))
6 t7 I& x% n; v/ ] V: x& U (setq PT3 (list Ln 0))5 k* h. i; U8 |, b: h3 _
(command "arc" PT2 PT1 PT3), `! Q# H, E t! }4 t* L
(command "lengthen" (entlast) ""). X: Q3 ^6 U7 [3 C
(setq Lxx (getvar "perimeter"))2 S' N) V- [' U. ?% [( c! }
(setq Ln (- Ln jd))/ V3 ]7 s6 p7 X
(if ( or (> Lxx L1)
8 C) m, X* b6 v2 B (< Ln 0.1)5 d/ Q% k- T u( ?2 t$ |
)6 G) }* E# m+ w4 I" ?3 e# _$ d
(command "ERASE" (entlast) "")
. G5 O( i( B& p/ ^ ()
" E3 u3 f4 V; E% F) l7 V )' Q$ b' ]9 I$ P! e
)! R( h, d( C, A& g
);(defun
. k' M6 Z( `4 F' q9 {1 U* i& ]4 T
! _( u/ ^- a. @; p[ 本帖最后由 www1974 于 2009-6-24 14:13 编辑 ] |
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发表于 2009-6-23 13:53:15
