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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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;画两直线的延长线到交点
& O# G" Q/ P1 u5 Q, n(defun c:ee(/ pt1 pt2 pt3 pt4 ip fl1 fl2 b1 b2 os)/ l& J/ y) A* i
(setq os (getvar "osmode"))
! c9 p! I! w# E. e (setvar "osmode" 0)
( y' m9 i( L2 m T+ K( N: q (setq fl1 (car (entsel "\n选择第一条直线")))
* U$ T8 J3 X5 F4 O J) o (while (or (= fl1 nil) (/= "LINE" (cdr (assoc 0 (entget fl1)))))+ b1 W. b# X a9 k
(setq fl1 (car (entsel "\n没有选择或选择的不是直线，重新选择:")))
; o! K7 d3 j& ]7 |) g% m; T) A0 P )
5 `4 a5 t1 V6 {0 D% I (setq fl2 (car (entsel "\n选择第二条直线"))): D! g5 u# N; d- g/ v5 a$ M! @ f5 l
(while (or (= fl2 nil) (/= "LINE" (cdr (assoc 0 (entget fl2)))))
# P7 i1 E5 c# W: Q (setq fl2 (car (entsel "\n没有选择或选择的不是直线，重新选择:"))), i/ y9 V; h# [# Z3 X: _; s6 w
)
* d% d& v; `* u% { (setq pt1 (cdr (assoc 10 (entget fl1))))
: z( B/ ]7 ]* d' j, z/ o; S8 Y4 L (setq pt2 (cdr (assoc 11 (entget fl1))))/ _8 @0 _: z5 E" ~( F3 j/ s9 N7 X
(setq pt3 (cdr (assoc 10 (entget fl2))))
: @; }6 ~+ z, Z' D( e$ Y (setq pt4 (cdr (assoc 11 (entget fl2))))
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(setq ip (inters pt1 pt2 pt3 pt4 nil))" l9 q6 s& z& z C7 j
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(if (= ip nil); `& m. V6 `' G, V" ?
(progn
; x7 J ?6 x! j5 e" s8 L* p, N) j (princ "\n\n两直线平行无交点!")% s/ {8 |: [9 G. e: W) A
(exit))1 [! [9 l4 p) C
)
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(if (or (and (> (car ip)/ E+ a5 `+ K& }) l8 f, O* e- n$ U9 H" P
(car pt1))# a x% s, a' _3 h0 q- E
(> (car ip)
7 _7 j l4 F1 ]6 c (car pt2)))
3 Y% z; V6 {$ p (and (< (car ip)
. _1 W6 Y. c) q$ V/ X (car pt1))
L8 e3 K3 ^# I8 ?* ~ (< (car ip)4 U- F. Q* D+ T* W
(car pt2))))
+ }+ z! R g* c2 z; T (setq b1 nil)
, M% I$ R2 j3 k) i0 ] (setq b1 t)
$ G: d3 o* Q& _8 C! {) K ), \+ q/ u* i4 Z$ Y9 G* ?2 W! P
(if (or (and (> (car ip) (car pt3))
' n) x* I6 a2 T: z4 D, `, N (> (car ip) (car pt4)))7 f9 z& A/ `/ E5 Z& {
(and (< (car ip) (car pt3))+ ?( R% H. n; E/ X4 x* N: Z
(< (car ip) (car pt4))))0 Z- n- S/ n& }/ y2 ?6 x, K
(setq b2 nil) ;交点不在直线二上* R9 k9 N6 C: `7 K
(setq b2 t) ;交点在直线二上
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# D. K% E% R1 C$ ~/ m! v
(if (= b1 T) ;if
. P4 N: w; C' M* X! ` ;then
( y% n1 W. r/ {1 m$ c6 Q (if (= b2 T)2 R; t Y+ A7 l6 \
(princ "\n\n两直线已经有交点!\n")
5 W' |4 s' k$ `( H( b (progn ;在第一条直线上，不在第二条直线上
" `8 y& x! C. N. ~- d (if (> (distance ip pt3)
- D8 u8 B8 ^: |6 V (distance ip pt4))7 @6 B/ c' ~2 N# z5 q. N
(command "line" ip pt4 "")
! w! _( z. [" w' | (command "line" ip pt3 ""))# r$ n; u& w. w, E8 c
)) m8 E0 A! m# V6 S
) ;else
P5 h: a6 Y' b5 R% d0 l. F (if (= b2 T)" h& l: U% b4 f& c! O
(if (> (distance ip pt1) ;不在第一条直线上，在第二条直线上
7 T/ ?; u, L# S& N. ~* |! h0 \" l9 \ (distance ip pt2)): _# a( M; C3 [6 T4 l
(command "line" ip pt2 ""); h+ f2 K( h }: }8 j& x: V7 | F
(command "line" ip pt1 "")) m, G" g* Z4 T: K
(progn ;与两直线都没有交点) w7 p' Z. @/ V3 t- C
(if (> (distance ip pt3)
9 H' U6 C9 w2 p" i (distance ip pt4))
1 ~' m c4 t8 ?) m9 R6 F (command "line" ip pt4 "")
- h. n7 p6 n; S. [; a8 t, l (command "line" ip pt3 ""))& ~8 W( J3 i- W* J& H2 D' t
(if (> (distance ip pt1)
3 O% h1 Z+ C& F7 _4 S (distance ip pt2))
/ ^* z4 c+ |6 P (command "line" ip pt2 "")
, H+ n& Y9 J: R- `: S, H (command "line" ip pt1 ""))
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): d3 r0 `) j `* _' ~$ u/ N* U
)
& k( U1 J1 |; s# Y1 X4 ?0 Q (setvar "osmode" os)
0 a: P8 @* m. N( ?1 {$ u# \ (princ) T& x- N' [) I& v) h: x
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