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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 y1 x. i+ N1 [: D. F _;画两直线的延长线到交点9 f" I2 }2 M$ P/ B5 x
(defun c:ee(/ pt1 pt2 pt3 pt4 ip fl1 fl2 b1 b2 os)
8 N9 M2 H1 p6 o* X0 G (setq os (getvar "osmode"))
4 Q. l4 [" q6 f! J' S6 i* s (setvar "osmode" 0)
7 S$ }. m7 h: _$ p9 t9 Z" ^ (setq fl1 (car (entsel "\n选择第一条直线")))" p* Q3 Z+ U2 l4 m5 I* R
(while (or (= fl1 nil) (/= "LINE" (cdr (assoc 0 (entget fl1))))), U/ M1 c+ a/ U; g( [1 H' z V7 a" p7 g6 J
(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")))4 f* H- b7 _2 e! p
(while (or (= fl2 nil) (/= "LINE" (cdr (assoc 0 (entget fl2)))))6 V8 c" N6 t( U7 w3 `* K0 d. A
(setq fl2 (car (entsel "\n没有选择或选择的不是直线，重新选择:")))
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) o7 s. N6 h* G: a; z5 _, C (setq pt1 (cdr (assoc 10 (entget fl1))))
/ F) R7 ]2 N4 K% D* L (setq pt2 (cdr (assoc 11 (entget fl1))))/ B0 q f: _1 t; D3 W; p8 V3 ?! V
(setq pt3 (cdr (assoc 10 (entget fl2))))
0 J3 ~% u" E( K (setq pt4 (cdr (assoc 11 (entget fl2))))
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(setq ip (inters pt1 pt2 pt3 pt4 nil))1 n8 `; a* Y* r4 h% c
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(if (= ip nil)
0 o- G& I+ E/ \) A (progn0 m6 Q2 d1 c n# H, u
(princ "\n\n两直线平行无交点!")
8 G* h6 `7 u8 J5 v+ Y (exit))" q* S2 Y2 u+ s. J( g7 k K
)
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(if (or (and (> (car ip)4 G2 _6 Y/ M" n `2 v
(car pt1))
2 | M; I5 {+ w# K7 `! _% Y& N8 |7 n (> (car ip)
; p- Y8 h" @8 L' t5 C" c; p (car pt2)))
4 P' W' j& h- R: O (and (< (car ip)' W/ G7 e# `; H, L
(car pt1))9 g& ~; R1 f' h0 Q0 G
(< (car ip)
+ j# t" [ ~% H+ X7 m (car pt2))))
: p: {; o! w9 ~: w: e, g+ X$ p (setq b1 nil)
$ G f# `7 j. g- i! y# u! h; X2 b (setq b1 t)
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(if (or (and (> (car ip) (car pt3))3 [; I1 l! X$ s% ]& {; s
(> (car ip) (car pt4)))( b; W8 m& z" F4 G# L% B. @8 D
(and (< (car ip) (car pt3))8 K4 W8 T1 M# Y2 {/ |
(< (car ip) (car pt4))))
. p9 \0 @' B! o& O (setq b2 nil) ;交点不在直线二上* d$ o% D: S f6 E. X
(setq b2 t) ;交点在直线二上) l; ]% S; X% S# \. N/ u+ b
)
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/ ] t) R3 `2 I (if (= b1 T) ;if' L; ~* f3 w6 Z$ o
;then
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(princ "\n\n两直线已经有交点!\n")
0 \, Z u' h- K2 `0 J (progn ;在第一条直线上，不在第二条直线上
% Q5 J/ h$ q; t- s. Y1 R (if (> (distance ip pt3)8 s1 V6 `& a- F L6 n
(distance ip pt4))
+ `! x9 m& i/ ~6 \, w1 d2 b$ L (command "line" ip pt4 "") s# ^4 k/ T: X+ o
(command "line" ip pt3 ""))
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' H! I: b4 t q9 X& v6 A v6 k$ ~# W ) ;else
* y. G3 Y1 a+ x# h1 |! O (if (= b2 T)
v% x4 f, z1 s) j (if (> (distance ip pt1) ;不在第一条直线上，在第二条直线上
0 a9 {. Q+ u$ ~/ x: S, Z9 Y (distance ip pt2))5 _) w7 w7 `) t) y' m; }: }7 V
(command "line" ip pt2 "")
% U& O- `/ f. h1 ~ (command "line" ip pt1 ""))( @0 a" x: o1 S/ [
(progn ;与两直线都没有交点
6 `9 }& m+ p; u% G5 B" r( D) u4 S (if (> (distance ip pt3)0 c2 {* d' t* T7 R- S: G3 [
(distance ip pt4))7 G) U. w3 t# E& E1 Z ^4 r/ _; g
(command "line" ip pt4 "")4 T7 F! C- f% h. l% ^
(command "line" ip pt3 ""))! t# K0 U+ b+ z2 a
(if (> (distance ip pt1)) A4 S5 Y# r" L/ i
(distance ip pt2))8 Y# P/ X9 b3 \- o5 I
(command "line" ip pt2 "")$ [, l- B+ Z1 i5 n Q
(command "line" ip pt1 ""))
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)
6 T# s* b, F6 _7 u (setvar "osmode" os); X6 R8 Y5 q9 [1 U; T
(princ)
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