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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：; {4 A2 h9 l- g: B
1 H, J u& @* O;画两直线的延长线到交点8 K; Q) w. k3 G' g
(defun c:ee(/ pt1 pt2 pt3 pt4 ip fl1 fl2 b1 b2 os)- g/ d9 b+ f% E* C. l0 x
(setq os (getvar "osmode"))
7 N/ B- q( P( [/ l (setvar "osmode" 0)
' }0 t# W3 r* I0 y, Z$ X4 f (setq fl1 (car (entsel "\n选择第一条直线")))' j1 X+ F W: W$ N8 Q9 D( r$ @6 D
(while (or (= fl1 nil) (/= "LINE" (cdr (assoc 0 (entget fl1)))))
% v# x' j0 T7 t% s; ?* _+ L (setq fl1 (car (entsel "\n没有选择或选择的不是直线，重新选择:")))9 y( ^& B& k- @& X( ^# J z
)! p7 k' S/ g y- k3 {
(setq fl2 (car (entsel "\n选择第二条直线")))9 ]7 N: e3 ^+ k3 u" M
(while (or (= fl2 nil) (/= "LINE" (cdr (assoc 0 (entget fl2)))))
4 ]. r* z! L" }& G8 b (setq fl2 (car (entsel "\n没有选择或选择的不是直线，重新选择:")))
, J/ ^4 w) ?1 _; u )) G5 N5 E5 O, Q9 W
(setq pt1 (cdr (assoc 10 (entget fl1))))# P6 P- ~ w& b
(setq pt2 (cdr (assoc 11 (entget fl1))))
/ T3 I! O( P6 m3 w7 r (setq pt3 (cdr (assoc 10 (entget fl2))))4 _ P7 ?0 G. E: ]0 f, i
(setq pt4 (cdr (assoc 11 (entget fl2))))) S, i# d0 Q3 K7 {3 q
8 S+ B% e0 m% h9 A* q+ s+ z# p0 a (setq ip (inters pt1 pt2 pt3 pt4 nil))
) H! B9 `8 C+ I, ? & S0 G) x: I* Y# L8 {# Y
(if (= ip nil)
8 h" s& R9 A- Z2 c9 V (progn9 V2 T* u: `$ j) v/ O( P
(princ "\n\n两直线平行无交点!")2 P$ \" C6 R# |
(exit))
) q1 `9 \) O1 e( q1 ] )* l8 L2 l0 S9 F6 _2 ?1 B
- U D7 R4 O! V% K (if (or (and (> (car ip); H. G% t2 h+ \1 l& O! _$ H: y
(car pt1))
, R" s, r4 o% s2 c9 ` (> (car ip)% |4 A# q( }4 @0 B5 B
(car pt2)))
, ?4 _# F0 [, k. j: r (and (< (car ip)
# H4 m# f0 V2 q9 d: d( a (car pt1))
\9 g9 V. Q* T# V% z+ G (< (car ip)
0 G( |( j2 X D j8 m5 O7 L (car pt2))))% Z1 O* `+ W8 [9 u& _
(setq b1 nil)4 K, A( P5 Q( d& s7 s5 {! o' z
(setq b1 t)
8 r v+ Z6 T% a8 L# p& E0 ?$ b )
7 M) U, ~+ w. E+ o (if (or (and (> (car ip) (car pt3))
1 q w$ ?. m6 j/ W7 R; P% Z2 M+ [ (> (car ip) (car pt4))). T8 A2 i7 P; o' X+ J
(and (< (car ip) (car pt3))
1 p5 M7 z. a. q$ r/ D (< (car ip) (car pt4))))
& h( p& X9 e: F1 C" e (setq b2 nil) ;交点不在直线二上
5 A. t& K: X5 B. A! }. F (setq b2 t) ;交点在直线二上
) ~, k+ x* B6 ` O( u; q/ Y )
. I& Q8 S/ Q, Y2 F; i" m5 O; K$ _7 C
! u3 B! V" }# K1 q {; S( V (if (= b1 T) ;if* n1 X3 ]# m' X3 M4 d8 T
;then: L2 V/ b- _! D9 W! i' i
(if (= b2 T)+ A6 |* [# s, q$ {9 D9 V
(princ "\n\n两直线已经有交点!\n")
; H1 m6 ^: m8 n! y" p( B. R" J (progn ;在第一条直线上，不在第二条直线上
! O; q! R* D$ P7 @. p# q B0 | (if (> (distance ip pt3)3 o% r2 C( u+ b- P4 W6 v' q; {
(distance ip pt4))
9 E* i$ T0 h `( V (command "line" ip pt4 "")
* V9 W, T# s1 v& A9 b; @ o (command "line" ip pt3 ""))
/ T5 S6 e6 ~* c9 @, T! h )7 x# S- a) b+ ^& O, a6 a2 `
) ;else
. G \5 I5 R4 q E' L (if (= b2 T)$ R/ k8 k& s+ o
(if (> (distance ip pt1) ;不在第一条直线上，在第二条直线上( ^8 V& G, _2 |3 i7 T9 ^- R
(distance ip pt2))0 E0 X( i v/ @& a. O1 D( K9 }
(command "line" ip pt2 "")
1 _/ {9 S; i e (command "line" ip pt1 ""))" l0 b% b% c/ c' }# [/ [
(progn ;与两直线都没有交点, |4 k$ {+ _& \7 i! W6 R( a8 Y/ H5 D
(if (> (distance ip pt3)
- E% x, d# M2 X+ P% u8 c (distance ip pt4))
: j3 W, M U0 \# c5 M3 D4 v (command "line" ip pt4 "")
" \* f, p" \9 A! O/ o9 S (command "line" ip pt3 ""))
* J2 B$ Z9 W+ R8 P (if (> (distance ip pt1)1 ~# O0 j5 P: ?; ^7 M
(distance ip pt2)): ]3 B) m6 C a+ _% |
(command "line" ip pt2 ""). p+ F6 c& m2 P7 y* d' K7 q
(command "line" ip pt1 ""))
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)
6 J) Z! _9 g |6 N& m+ v8 M+ }- U )8 u' U) @( C. ]% f
(setvar "osmode" os)* |+ f H% D5 [5 z, ^# q. j; y$ }' a
(princ)
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