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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8 o; j1 E! V9 D, e
(defun c:ee(/ pt1 pt2 pt3 pt4 ip fl1 fl2 b1 b2 os): j. x5 L( {0 a9 V3 _
(setq os (getvar "osmode"))
7 Z& F" m ?3 h (setvar "osmode" 0)
- ^! w# l% }7 b! s0 O; L (setq fl1 (car (entsel "\n选择第一条直线")))/ i% y9 W1 b/ q( P
(while (or (= fl1 nil) (/= "LINE" (cdr (assoc 0 (entget fl1)))))' J+ I! x6 @7 B4 g
(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")))
l, \( g) E. ]. m/ C (while (or (= fl2 nil) (/= "LINE" (cdr (assoc 0 (entget fl2)))))
4 S, o' z8 m: V) Q1 R (setq fl2 (car (entsel "\n没有选择或选择的不是直线，重新选择:")))
$ @: l1 r6 N' w5 c c: t9 R )* v! p. I* m$ G7 v4 }- Y1 G
(setq pt1 (cdr (assoc 10 (entget fl1))))7 M, H7 D4 \( p/ g4 e6 I, {0 W- m8 {
(setq pt2 (cdr (assoc 11 (entget fl1))))
9 C. W/ |7 t% H- k9 c2 x* u (setq pt3 (cdr (assoc 10 (entget fl2))))- ^/ f7 p3 v$ d4 O
(setq pt4 (cdr (assoc 11 (entget fl2)))), @$ j% D! G8 v3 v$ F
- T$ b* g1 [+ q2 [& G4 S (setq ip (inters pt1 pt2 pt3 pt4 nil))
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(if (= ip nil)
5 l( V9 R7 m2 F/ g2 l Y+ U (progn* \' u7 J: H- H$ `: ^
(princ "\n\n两直线平行无交点!")
?6 \' _( X% C2 T (exit)) p3 p% t6 R, u0 t! t
)# `5 C3 W' ^2 H2 W, G
; ^, b0 e/ a# X# N: m (if (or (and (> (car ip)
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(> (car ip)
/ `9 b; X$ [8 [% R# }- R/ ~- h. [ (car pt2)))0 c6 @! R; @2 K4 ?
(and (< (car ip)
/ d( l n8 ]% M) d2 c (car pt1)): b1 v: v/ g& R! v R( Q
(< (car ip)
9 k0 u6 W, D2 A (car pt2))))
- t# {$ v( N, k4 l/ e' |$ s8 l (setq b1 nil)
; m7 ^! |5 }( N0 O- M4 Y3 ] (setq b1 t)
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(if (or (and (> (car ip) (car pt3))) y* t- K) _, O" m9 B5 t9 T
(> (car ip) (car pt4))). g* p5 L5 O! E z( ?% K
(and (< (car ip) (car pt3)); n# j( P; U7 X" b: p, u% D, i* p
(< (car ip) (car pt4))))
! K) N2 w2 {. S$ ? (setq b2 nil) ;交点不在直线二上
/ K( I" G/ \4 n (setq b2 t) ;交点在直线二上
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1 d, E- z) e4 b+ O: g (if (= b1 T) ;if# S' r, h& O8 z" A1 ?% p/ L
;then
" X- g+ u4 R8 F! u/ W* J (if (= b2 T)
8 Y$ B+ s# y4 f3 r. } (princ "\n\n两直线已经有交点!\n")
! I4 [ Q, i4 ]. q% L- o (progn ;在第一条直线上，不在第二条直线上
) I' O) L% d" e2 `! f. n (if (> (distance ip pt3)/ t9 E( i1 M* N1 D) n, E& ^
(distance ip pt4))! ]' x0 ?& p# j6 Y" P- Y
(command "line" ip pt4 ""); m. ~. ^8 m# }- j6 `: n* ~
(command "line" ip pt3 ""))/ Y# |- Z" h, s
)( ~, E- E9 w$ ?4 w8 Z
) ;else7 Y- ^0 B h( R, ?: G
(if (= b2 T)
4 ?' p1 s+ E( s" U/ u" H' U (if (> (distance ip pt1) ;不在第一条直线上，在第二条直线上( n: L; q* M0 ]+ l
(distance ip pt2))' h7 K6 O* p# k x J5 ?' M
(command "line" ip pt2 "")! o) z* |/ n. Q; @9 I0 s* U
(command "line" ip pt1 ""))0 K1 I7 X$ [, _' n
(progn ;与两直线都没有交点2 H% h( x9 E2 }2 |6 g* F
(if (> (distance ip pt3)
6 b* u7 M% g, H2 B D (distance ip pt4)), X% [$ z; x \( N: p, V
(command "line" ip pt4 "")/ n* r! I6 F1 E, I3 _3 [
(command "line" ip pt3 ""))
& R, h! b9 X, I- F: T* I) v (if (> (distance ip pt1)
. M: r: q" x/ _( Y7 m, y (distance ip pt2))5 k* O, h7 [! }
(command "line" ip pt2 "")
; }7 @( F( m1 }% x (command "line" ip pt1 ""))5 _5 j" h$ e- }: Z" Y
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)
6 N) p D! I) a6 Q )
5 k" c& v0 S1 U+ Q5 T7 N2 A& p (setvar "osmode" os)& x V3 E1 x5 I7 x3 S `% b
(princ)
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