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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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7 X4 t0 [5 e# r$ n;画两直线的延长线到交点2 i: S+ M# g( G$ ?1 w+ G# m
(defun c:ee(/ pt1 pt2 pt3 pt4 ip fl1 fl2 b1 b2 os)
; h5 ?, w. B( u+ D$ e (setq os (getvar "osmode"))
* g1 W, z4 Y/ j. n$ H% X' Y2 Y (setvar "osmode" 0)6 R- V) p* \: [- h; i! {. a9 t
(setq fl1 (car (entsel "\n选择第一条直线")))' ]$ |) e" Q% d& ^5 F; ~6 ]# P
(while (or (= fl1 nil) (/= "LINE" (cdr (assoc 0 (entget fl1)))))0 [: i+ E3 d# J( B. A
(setq fl1 (car (entsel "\n没有选择或选择的不是直线，重新选择:")))
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(setq fl2 (car (entsel "\n选择第二条直线")))% V% g! C) p0 s1 q: Q- n, b
(while (or (= fl2 nil) (/= "LINE" (cdr (assoc 0 (entget fl2)))))
: Q' ^2 i* P2 i$ P& p8 V6 A8 X0 M (setq fl2 (car (entsel "\n没有选择或选择的不是直线，重新选择:")))9 C: W8 v) P+ N& @
)
: U5 b( O* w7 ]' s (setq pt1 (cdr (assoc 10 (entget fl1))))
% J9 M# A& R& B/ [" ?8 K8 H b (setq pt2 (cdr (assoc 11 (entget fl1))))1 A5 w# Z' P5 S1 T- f% V* W6 r
(setq pt3 (cdr (assoc 10 (entget fl2))))
0 E1 Q. Z _: ~8 y% g; w8 \- V, h (setq pt4 (cdr (assoc 11 (entget fl2))))/ t1 o4 m2 {6 V
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(setq ip (inters pt1 pt2 pt3 pt4 nil))" w' w; k% `2 K* K
# J2 P$ G5 b- k7 T- Z V6 | (if (= ip nil)
& E. q) ^* { { v (progn5 U! X9 d1 e4 N' ?& f6 p$ J* C
(princ "\n\n两直线平行无交点!")
+ _! {1 X: \# |& _- [ (exit))0 }2 ^8 W: {8 u7 L
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(if (or (and (> (car ip)
9 h, {5 [: |/ }3 m (car pt1)). B+ I* x. v1 M$ {# ]
(> (car ip)( F4 U J# `* i3 G' J
(car pt2))): O) k# Z5 k% i: b
(and (< (car ip)
2 u1 o7 M" f! }4 h' `# g: C& K, W (car pt1))
5 g% ], Y; y: y9 Y (< (car ip)- ?: ]3 [( R; f) I% g
(car pt2))))
8 G; Q: P7 Q& L& d9 ^+ j) T (setq b1 nil)) [/ _; s, j9 X+ s1 ^) @
(setq b1 t)
5 G- Y9 X1 I6 T# T9 z2 y. I )
, t( j' x9 t# q (if (or (and (> (car ip) (car pt3))1 y* z; S7 g% g0 P" C; U
(> (car ip) (car pt4))) @6 r: ` K- |% v& Z
(and (< (car ip) (car pt3))
7 w8 j: i+ W, H8 C9 c" j' R- \ (< (car ip) (car pt4)))): E6 s! I: @) r' Q+ h3 ^
(setq b2 nil) ;交点不在直线二上
* l s+ F6 Q$ T# ? (setq b2 t) ;交点在直线二上1 h0 B- I, q1 z/ T" l
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t; Y# V- X2 q C. g4 y0 ` (if (= b1 T) ;if
( r: `1 c0 ? S d ;then
0 {$ R" \. \ ^, c (if (= b2 T)
; O7 G' ]9 U! c+ K* x7 W$ F (princ "\n\n两直线已经有交点!\n")1 \5 P& x, l& |" F! ?
(progn ;在第一条直线上，不在第二条直线上
2 |! Y$ v* ^% ~6 x! T6 n" t (if (> (distance ip pt3)8 w; C( s, p: I3 M
(distance ip pt4))
4 r# z( c, E( h0 }% V (command "line" ip pt4 "")
6 \8 d' d+ n. _9 ]. t (command "line" ip pt3 "")). V: z# ^; B) Y: ~: k
)& z6 K( \+ k* g: e
) ;else9 `# X% G$ x; s7 d& b, F0 q" L
(if (= b2 T)$ E( Q- @7 K8 N+ q" u
(if (> (distance ip pt1) ;不在第一条直线上，在第二条直线上8 E- i- x) l8 d2 L# `, |
(distance ip pt2))
) z6 s7 n! ]8 M* e+ F (command "line" ip pt2 "")
- h( ^2 ]2 n; \% O( n (command "line" ip pt1 ""))
1 I# w7 l. p6 c* ]/ e (progn ;与两直线都没有交点: `9 m& e" t( S6 v' p
(if (> (distance ip pt3)* j5 i" [ O& Z2 [3 h
(distance ip pt4))
) N+ P6 l% `7 G* z; K (command "line" ip pt4 "")
( X4 N Q9 q3 a5 R! H (command "line" ip pt3 ""))
- S, r0 e4 a) b5 M (if (> (distance ip pt1)
) `) L. ~2 u/ _2 E4 q1 B* B (distance ip pt2))
, b, j4 h! x9 [ (command "line" ip pt2 "")- k; ~* _8 y) v" H; l
(command "line" ip pt1 ""))3 h- Z' v3 r. D$ O: F
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)
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(setvar "osmode" os)
6 ]; J( |) t* L* L0 ^ (princ)0 i7 D E; z/ D$ N2 O6 ?
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