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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：
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8 }4 q6 ^' D5 j* f+ V1 g. K;画两直线的延长线到交点
5 n, I2 A- \' U) m3 j(defun c:ee(/ pt1 pt2 pt3 pt4 ip fl1 fl2 b1 b2 os)
; R( ^4 T% @: Y, E2 u7 ]$ A (setq os (getvar "osmode"))
. i8 C* i- f& k6 v" C0 Q5 F, F (setvar "osmode" 0)) K" c, t0 G2 c9 y& s( ?' x+ v
(setq fl1 (car (entsel "\n选择第一条直线")))1 k8 R' \2 G4 T4 Y
(while (or (= fl1 nil) (/= "LINE" (cdr (assoc 0 (entget fl1)))))# s0 R! \% q9 x
(setq fl1 (car (entsel "\n没有选择或选择的不是直线，重新选择:")))
! C2 H8 s: t9 N" a, f+ b. m )
0 h2 H3 C4 O4 o& ] (setq fl2 (car (entsel "\n选择第二条直线")))8 i, F! ]7 _ ^6 W9 {
(while (or (= fl2 nil) (/= "LINE" (cdr (assoc 0 (entget fl2)))))
7 r2 B6 C1 V, ~ (setq fl2 (car (entsel "\n没有选择或选择的不是直线，重新选择:")))
' C% W8 [# j0 a4 j { )% J9 x3 v' X( L7 b6 P9 C
(setq pt1 (cdr (assoc 10 (entget fl1))))
6 w* ~! \! I) }) u9 B$ p4 E2 Q (setq pt2 (cdr (assoc 11 (entget fl1))))
# e/ B! d7 Q$ H+ U# n5 ~ (setq pt3 (cdr (assoc 10 (entget fl2)))). _5 h8 o4 P1 f& L
(setq pt4 (cdr (assoc 11 (entget fl2))))% m x3 P4 L1 S5 C1 q$ g
2 @# b8 a u; m# K( S. L (setq ip (inters pt1 pt2 pt3 pt4 nil))
, y( \7 U9 h/ T' F( `4 @( \
5 [( r' N! D6 l) U8 ?2 S (if (= ip nil)! c. c# C7 `- g: _5 e- Y
(progn0 p2 a: c2 L6 B+ v8 I
(princ "\n\n两直线平行无交点!")
" B. e: y% A! O- l (exit))+ `; k9 z& O5 H) K; m& Y+ L
)
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" \1 @5 v/ h4 Z" L9 V: u (if (or (and (> (car ip)! P& {& Z5 X: A$ P
(car pt1))% n3 d& U1 a1 e
(> (car ip)2 ]- d6 Y/ D) o+ P7 g- d
(car pt2)))
0 ~( F: \: a5 q$ b% ]% g7 G" Q (and (< (car ip)
! r8 M3 j: [. J. o6 V( t4 ?+ }% f (car pt1))
8 ~- s* q; w6 r6 h (< (car ip)
( k2 G) a" c* r (car pt2))))
% G3 p# S3 g& r( j9 Z/ J (setq b1 nil)
' Z! `( a8 ~3 p& U* g (setq b1 t)* \9 }3 E/ V2 j
)* K4 i; @ j, k1 B3 x+ g! }& e; L
(if (or (and (> (car ip) (car pt3))# H i: F# }4 v7 B% X
(> (car ip) (car pt4)))6 F9 p8 `' Q+ u6 [' N2 A2 w
(and (< (car ip) (car pt3))
_/ P1 n( [& F1 D% W; ^4 ^" J/ a5 n: v# p (< (car ip) (car pt4))))
* Y: c4 J Y+ w (setq b2 nil) ;交点不在直线二上; z) K9 |8 K2 d- u
(setq b2 t) ;交点在直线二上9 h4 u: j2 L# D8 [2 a$ |3 j
)
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(if (= b1 T) ;if9 ~8 j. _8 K8 `2 E
;then( c) [3 U2 S' H. }, f# T
(if (= b2 T)
4 B2 Q, A8 k( H: J) e (princ "\n\n两直线已经有交点!\n")
' ]4 S4 g0 j; f- [( W2 Z (progn ;在第一条直线上，不在第二条直线上+ A/ J% G) |4 t$ H. m4 j
(if (> (distance ip pt3)4 L6 v/ H: `9 k
(distance ip pt4))
U5 s) h/ @1 F4 i. K, O T (command "line" ip pt4 "")7 r) g1 u* v- {" G+ G h
(command "line" ip pt3 ""))
# t: o% ?0 `& ~: ^4 |$ ~9 N* z )$ s$ Z3 v, t7 m. u/ s
) ;else
. _& g* Z# w( _9 j3 G% B. A2 H8 A (if (= b2 T)
* ]- U# j$ h, G% U( ] (if (> (distance ip pt1) ;不在第一条直线上，在第二条直线上
* d6 |# }1 l' u$ S; ^4 H# |. O2 | (distance ip pt2))
9 w. K8 H8 W1 |2 i (command "line" ip pt2 "")- S, G+ \; \0 l5 O: G! t5 K
(command "line" ip pt1 ""))
" r0 z. W, Q( l# U. y" X (progn ;与两直线都没有交点
& u$ H+ g3 n1 I5 U9 s5 T7 ~4 B (if (> (distance ip pt3)$ L9 }# n( b* b' J. E. ~" A
(distance ip pt4)); v9 o6 _( C( B- w+ `$ j9 @
(command "line" ip pt4 "")
( A# I/ l( h n1 ~; V (command "line" ip pt3 ""))3 c( ^# `; A4 H
(if (> (distance ip pt1)
. ~7 s- j# i2 t5 ` (distance ip pt2))
9 s2 T4 [) N/ Y (command "line" ip pt2 "")
4 R' T& `) h4 ] c (command "line" ip pt1 ""))6 h& j d4 z! i( ?" ^
)
) w5 d6 J4 f) C )
7 ^: O& X1 f# n7 X+ a4 @; Z )
* C2 n9 |3 u% A (setvar "osmode" os). |$ m7 n7 J5 {4 w
(princ)
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