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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：' E6 v* w$ p9 K7 p# x. s* `8 H' t' u
+ S3 B" V0 n/ M& |# n0 {# {, \;画两直线的延长线到交点4 p$ Z- a) K1 Q% g0 a3 O
(defun c:ee(/ pt1 pt2 pt3 pt4 ip fl1 fl2 b1 b2 os)) ~, e6 H' G& S+ @$ S2 ?
(setq os (getvar "osmode"))
8 G7 M1 o- G5 P9 a% ^. H5 T* A% Q (setvar "osmode" 0)
! f1 A8 P4 S! s; o( }: N5 `/ l (setq fl1 (car (entsel "\n选择第一条直线")))$ m9 G# L4 q* M% ]/ e; H
(while (or (= fl1 nil) (/= "LINE" (cdr (assoc 0 (entget fl1)))))
2 Z3 y @$ s* U) u3 K5 s9 a" W- G (setq fl1 (car (entsel "\n没有选择或选择的不是直线，重新选择:")))8 z( [3 P6 {# ?% H+ P
)
# ^6 f/ @/ H4 x0 q% C. V7 A$ y (setq fl2 (car (entsel "\n选择第二条直线")))
6 c; G! b, ]8 g% h (while (or (= fl2 nil) (/= "LINE" (cdr (assoc 0 (entget fl2)))))) s, p% b5 U9 \; ~& M
(setq fl2 (car (entsel "\n没有选择或选择的不是直线，重新选择:")))
4 U3 X0 P+ F; u2 [ ^, u' r )% H. d0 Z3 `: M+ S
(setq pt1 (cdr (assoc 10 (entget fl1))))
/ }( H% S6 `( e5 G# [* L, M (setq pt2 (cdr (assoc 11 (entget fl1)))): ?" e* a3 {/ N
(setq pt3 (cdr (assoc 10 (entget fl2))))7 I& |2 \. R: n# m
(setq pt4 (cdr (assoc 11 (entget fl2))))
2 C+ w1 s4 r: z$ N6 `5 e& r9 y8 l1 t3 b $ `6 k8 J. ^% |8 b0 I [
(setq ip (inters pt1 pt2 pt3 pt4 nil))
; h9 C% t6 A: ^* q A( X/ m
9 w6 d; J4 `3 ?# D: w/ | (if (= ip nil): S6 A4 W! F5 Z Q' L. E/ h/ W
(progn
, F6 ^. x2 f7 H2 o& N, x% H (princ "\n\n两直线平行无交点!")
- v. m/ n- j. K& S (exit)) h! K& I0 K( o
): @/ p* I$ t: |2 O1 D, }
! O) E6 Y+ @, o, ?
(if (or (and (> (car ip)! P: E% W. }$ L% @7 w
(car pt1))& I* ?" V& ]0 d7 |
(> (car ip)( S% t& x5 ]7 e# ]2 K0 d! {3 u
(car pt2)))
5 `8 S% T# L% P6 E7 z (and (< (car ip)
5 b1 |1 i1 [7 |; ^5 B8 [6 ?: `1 ] (car pt1))9 s7 P: D) i0 ~ U; J5 \
(< (car ip)
: w6 j! s) f7 U9 S! l" { (car pt2))))
1 p2 U) M6 R7 h | (setq b1 nil)
! H$ D$ }7 q( s1 C# c+ ^8 z (setq b1 t)( ?& u) D5 ~/ Q+ Q7 @; W
)
; g8 L+ L5 N4 C/ g& D# ^ (if (or (and (> (car ip) (car pt3))
, K0 V9 i" d+ b) E (> (car ip) (car pt4)))
; R: d* O* x0 [" O5 S6 _2 g (and (< (car ip) (car pt3)) K4 S1 R) p. ~$ G
(< (car ip) (car pt4))))
6 i( A2 w. z; s) S/ Y (setq b2 nil) ;交点不在直线二上1 k4 k5 a9 I" S g' A4 @
(setq b2 t) ;交点在直线二上* H1 |8 H9 T# n: k' A) m+ G- O
)
! ], }, \3 _9 b& w. ^$ M5 ~
0 {1 q9 z8 H9 H% F i (if (= b1 T) ;if" y1 X+ j. a, L* x+ ~# N
;then/ e6 N1 T5 Q s _
(if (= b2 T)- D3 w" K7 K) E4 o% T
(princ "\n\n两直线已经有交点!\n"): D. a- N# A; M. k2 i
(progn ;在第一条直线上，不在第二条直线上9 }* n/ G$ b* H! i( L
(if (> (distance ip pt3)
: I, X- V1 j' }! I: L. n& o (distance ip pt4))5 [3 ]/ k1 d/ d* v' k3 F
(command "line" ip pt4 "")$ ] H* B/ {, U# U+ G6 Q Z
(command "line" ip pt3 ""))
3 E! ~/ h# B0 S3 s1 O )
8 K. X; P( w4 ?9 ]: |' G- k ) ;else
3 M$ Y: U" m! B. n7 Y% m (if (= b2 T)
! [/ J1 U) V- h4 ~5 P2 z (if (> (distance ip pt1) ;不在第一条直线上，在第二条直线上* Z$ x2 u8 r- u/ w$ w3 _
(distance ip pt2))1 Y$ M1 ]) \- B3 z& v. b9 `
(command "line" ip pt2 "")" o) k: R1 d& n- @% e
(command "line" ip pt1 ""))
- P: b% ]& y; e (progn ;与两直线都没有交点
& j! P8 K! u. J! d1 w8 K (if (> (distance ip pt3)2 a) E1 m# o% H$ b6 ?2 Y* ?
(distance ip pt4))5 B6 L5 N9 r; f: M
(command "line" ip pt4 ""): H4 g4 ?3 K' h& ~ w: `& s
(command "line" ip pt3 ""))
7 W! p4 f; J: N9 [2 \' r* R5 @: } (if (> (distance ip pt1)
6 o5 W# v# d4 a) q) Y# r (distance ip pt2))6 [- L# A* J( C7 n' P
(command "line" ip pt2 "")
& Q0 M! ?! E0 g+ f; v# Q (command "line" ip pt1 ""))
" z! U: n# u1 M( a )
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)1 Q( ?+ N( ?$ Y$ J6 x( V9 x0 k! `' Z4 N
(setvar "osmode" os)
, Z2 k7 A6 x0 W0 P (princ)2 R. }8 _$ ~, `
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