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发表于 2007-10-31 14:22:12
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来自： 中国江苏徐州
下面是本人编制的一个LSP，可以完成这个工作，把它复制到CAD的surport目录下的acad2006.lsp文件中，使用时只要打入命令ee，然后选择要延长的两直线就可以自动生成延长线了：( t0 I9 w' y, c/ F2 L7 K
% }8 n' v% R3 B; H, ~+ W;画两直线的延长线到交点9 G: I. U) d7 i! W# m
(defun c:ee(/ pt1 pt2 pt3 pt4 ip fl1 fl2 b1 b2 os)3 |4 h: z+ M, S o! Q
(setq os (getvar "osmode"))
4 S! f7 B: @/ V0 u$ A) a, {/ Q (setvar "osmode" 0)
+ u9 |- I0 ?8 ]' x: U (setq fl1 (car (entsel "\n选择第一条直线")))
% D8 T2 `- Y% R; ` (while (or (= fl1 nil) (/= "LINE" (cdr (assoc 0 (entget fl1)))))
% {% B3 o8 l1 A4 z6 T (setq fl1 (car (entsel "\n没有选择或选择的不是直线，重新选择:")))% I* V: E3 z; r# \/ _
)# H% P& s6 L/ U# H6 G ^( k9 L
(setq fl2 (car (entsel "\n选择第二条直线")))
7 C% ~' q/ q$ ^0 |$ Y8 p! c (while (or (= fl2 nil) (/= "LINE" (cdr (assoc 0 (entget fl2)))))
4 b/ t1 q6 M* W+ o* c1 J (setq fl2 (car (entsel "\n没有选择或选择的不是直线，重新选择:")))
: i- E0 l% C: q9 E. V' [ )
% u; z \3 Z5 T6 I) t2 r2 D (setq pt1 (cdr (assoc 10 (entget fl1))))+ J/ Z0 D: _) ?; E/ J
(setq pt2 (cdr (assoc 11 (entget fl1))))
" c, h7 d; }- }% Z5 k' G (setq pt3 (cdr (assoc 10 (entget fl2))))8 b4 z$ t0 P4 t" e2 h/ z5 e3 H
(setq pt4 (cdr (assoc 11 (entget fl2))))+ c! n, e# X9 g
+ ^3 v; K' ^2 H8 u
(setq ip (inters pt1 pt2 pt3 pt4 nil))
0 E- u" |) R S! B; \( Y . z g. C; B( R4 I( y
(if (= ip nil)2 N, T; R; y4 q7 G
(progn% _) z8 h4 T/ s Q
(princ "\n\n两直线平行无交点!"). A V( O! g6 m: H5 i
(exit))
+ D n+ _1 ~ o6 }* U )+ @# V1 I( {2 q) h1 C# U
! s% |" j4 p9 T/ B6 D, u
(if (or (and (> (car ip)" x. W6 q3 y2 p+ F. |% W' N
(car pt1))* k! Q# k8 \7 v. K
(> (car ip)
. }0 A9 r( `. E (car pt2)))
* V7 w7 B: _" B% p (and (< (car ip)$ V# L2 |% U; a% j# L( \
(car pt1))
# j. S- q# z c2 U (< (car ip)/ X2 z8 O. x" [. p
(car pt2))))
# I3 ~* r7 s2 s1 G% _; m( r2 E (setq b1 nil)2 h* v; k' p3 k8 ]( X
(setq b1 t)
$ q6 C. p) g/ z% L& w )
8 u' M* z) ^5 @5 I) s5 Q2 D (if (or (and (> (car ip) (car pt3))" `" g* o+ s% O1 j6 U
(> (car ip) (car pt4)))
/ [; V2 e) H8 S& q1 K (and (< (car ip) (car pt3))& m1 W; m; o$ f$ X
(< (car ip) (car pt4))))
8 m3 E, ^5 z/ H/ V& }! b' e (setq b2 nil) ;交点不在直线二上
6 v$ ?7 G% \8 D (setq b2 t) ;交点在直线二上
7 K+ r- g% c1 @( `6 { ). Z5 I; J# Y6 U- m+ O( j
4 o# J- Q" l8 R* {0 i; M+ P
(if (= b1 T) ;if
' h9 \6 d- M) K) V" T4 H6 w4 ` ;then
1 J) \6 M: \8 s3 z; R (if (= b2 T)
5 c# C" X+ x" G7 u$ S5 G& \ (princ "\n\n两直线已经有交点!\n")
$ N4 J' U# t, `5 m# R% F (progn ;在第一条直线上，不在第二条直线上
& K7 p& P) {* u* b% k (if (> (distance ip pt3)5 x/ u# \0 K* f$ [$ k! J7 i
(distance ip pt4))' e3 b b2 P3 m) S$ k, k' H6 W- J; R
(command "line" ip pt4 "")" l- I$ T! p- M7 L* d9 v) v
(command "line" ip pt3 ""))
; s# N$ [. R! m% R2 T )
# f$ z$ T* }" L- s ) ;else; V9 l7 \ r1 G9 P$ d- [9 t
(if (= b2 T)" y2 B3 k$ V/ I, Q! c
(if (> (distance ip pt1) ;不在第一条直线上，在第二条直线上
/ i5 g* b5 l5 @+ ]6 Y) h (distance ip pt2))
: R3 }6 M4 q1 F. Y (command "line" ip pt2 "")
& k) W; R5 t" d. H4 S' D (command "line" ip pt1 ""))8 f# b9 c- B; ~, P& c
(progn ;与两直线都没有交点3 M& k5 h6 e/ W2 s" U
(if (> (distance ip pt3)
, d9 q2 N% Q' U (distance ip pt4))
! z: d6 s% a+ D' z4 L6 ` (command "line" ip pt4 "")# D$ b, j. {2 q, l' C1 D
(command "line" ip pt3 ""))
' s& v5 Z- |5 l! w& C* Z (if (> (distance ip pt1)* u4 z0 X' v+ X4 s
(distance ip pt2))
2 A1 t5 y! _8 D' Z' K8 S4 Y (command "line" ip pt2 ""); j+ S- b7 L; J% e$ F7 }
(command "line" ip pt1 ""))( q: C" t& w M( Z& |! o
) \* o% o! a: ?0 ^
)
3 k% _" g* ]5 z& A' F )6 k) K- _6 m$ }- z
(setvar "osmode" os)2 Y5 f2 K" _$ V# p
(princ)
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