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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：8 R# r2 ~: x" j
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;画两直线的延长线到交点" _* C/ h, L' A: o% p$ F. B" g
(defun c:ee(/ pt1 pt2 pt3 pt4 ip fl1 fl2 b1 b2 os)$ C7 g" X" \+ l, j
(setq os (getvar "osmode"))# ^: x) d$ b6 ?( L a% S
(setvar "osmode" 0)6 }8 ^# g0 x7 N% ~' g
(setq fl1 (car (entsel "\n选择第一条直线")))
: F9 [/ O6 {) d" A ]$ Q' o% _ (while (or (= fl1 nil) (/= "LINE" (cdr (assoc 0 (entget fl1)))))
+ ?% s6 T/ o7 Q! E! v (setq fl1 (car (entsel "\n没有选择或选择的不是直线，重新选择:")))
4 C% f$ y- T6 E R )
# J: Y3 j. z( P/ C( x (setq fl2 (car (entsel "\n选择第二条直线")))
5 X6 _7 x; O! q, z (while (or (= fl2 nil) (/= "LINE" (cdr (assoc 0 (entget fl2)))))% d/ g7 t. A0 H
(setq fl2 (car (entsel "\n没有选择或选择的不是直线，重新选择:")))
5 H! P7 \! J) s, Y1 `; f& R) x; i' g6 _ )
% w! x2 w' k1 b& F6 o9 O% e) D9 _ (setq pt1 (cdr (assoc 10 (entget fl1)))), K$ L0 }' q8 X; f+ y) C
(setq pt2 (cdr (assoc 11 (entget fl1))))
" j2 E$ E: ]/ o (setq pt3 (cdr (assoc 10 (entget fl2))))4 |3 j" g* F$ ?1 m2 c# j% p6 `
(setq pt4 (cdr (assoc 11 (entget fl2))))
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(setq ip (inters pt1 pt2 pt3 pt4 nil))$ L x/ v" y0 r( r/ ?0 A
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(if (= ip nil)4 a, r: r% K+ P' n
(progn: K! G6 X9 U$ a( b# o: B6 o
(princ "\n\n两直线平行无交点!")% J: f% t6 a: M( z" r3 z
(exit))8 k5 A+ o4 H9 E5 m5 M
)
& _# u% z4 M- _0 K7 b
" h/ W: G. L4 t! q3 l (if (or (and (> (car ip)
- k1 O% ~+ v- D" t7 L (car pt1))0 p) K. \ h# E/ a7 Z
(> (car ip)* K% I8 U4 z9 @3 |6 y1 `
(car pt2)))! }; D, I! F# X4 N: y; g
(and (< (car ip). V: Q4 I; w( e7 \: o' W" H$ F0 B
(car pt1))5 A, [* b* n7 r1 R/ f8 I6 Y( P
(< (car ip)
" W+ H, L9 k3 O# K (car pt2))))
/ S: c+ @5 V0 u# r6 { (setq b1 nil)* K1 |0 {7 U% G# w" G: w: R% `
(setq b1 t)
' o* `+ T6 L: Z )
& H2 d0 N* E8 J0 y- A (if (or (and (> (car ip) (car pt3))* E% T0 b' J; n7 P$ g2 U
(> (car ip) (car pt4)))
$ N0 V& K9 }" Z5 t2 G3 `8 Z/ z (and (< (car ip) (car pt3)). C( r. w) F0 E j3 [, b
(< (car ip) (car pt4)))) o8 o* A! p! L
(setq b2 nil) ;交点不在直线二上( \5 y3 }( b3 Z- s/ g# b# O: o
(setq b2 t) ;交点在直线二上
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(if (= b1 T) ;if+ R4 y2 \3 s( }3 X
;then
9 A" f+ i" U# v% w0 K* A (if (= b2 T)
1 X3 N# V9 e7 _" f (princ "\n\n两直线已经有交点!\n")5 {5 _( L/ s) S
(progn ;在第一条直线上，不在第二条直线上" i1 Q- v; s$ |6 C* r
(if (> (distance ip pt3)+ \, |( p: N+ m+ |0 W/ T3 T
(distance ip pt4))& J o0 _$ x2 S0 h8 S5 @! W
(command "line" ip pt4 "")
- @: C0 W2 a( i4 J0 |4 } (command "line" ip pt3 ""))
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) ;else5 e7 s- T2 Z# ?. p$ p3 l
(if (= b2 T)
1 f" d( F# _% E* _& ?9 F( } (if (> (distance ip pt1) ;不在第一条直线上，在第二条直线上
9 X3 M! Q" X+ j0 H4 L+ K (distance ip pt2))
* E5 d3 B* O6 [8 N; {3 Q5 ?2 v$ A (command "line" ip pt2 ""), T* g5 x7 p' ^4 _3 I% V) b& F
(command "line" ip pt1 ""))6 T+ r7 j- ?+ S
(progn ;与两直线都没有交点
$ _ ~0 D9 M: H3 }9 _3 u (if (> (distance ip pt3)
7 e, Z- m; W2 l$ \% G (distance ip pt4))) i8 K Y, \+ p/ x% d- @: L' y, b
(command "line" ip pt4 "")
6 Q& L" k6 j e3 R2 K6 ~ (command "line" ip pt3 ""))
' {0 |" R' M" P( l (if (> (distance ip pt1)
9 A/ Z. v1 |1 V (distance ip pt2))4 X; J0 k# }/ \+ J
(command "line" ip pt2 "")
) D' ^" ]0 @8 S' w* P4 [, }, k (command "line" ip pt1 ""))7 N- X% w2 D; Y0 z
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)
6 ]2 J. Q/ }6 B( u! Q0 | (setvar "osmode" os)5 k; H, r2 j: L
(princ)9 L* H0 _) b; S# P/ m1 N X. H) S: B
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