怎么采用等分或者等面积划分一个不规则多边形
请问如何实现对一个不规则多边形进行等面积或者等分成多个相等面积的子多边形。谢谢。 (vl-load-com)(defun ebox (e / pa pb)
(Vlax-Invoke-Method (Vlax-Ename->Vla-Object e ) 'GetBoundingBox 'pa 'pb )
(setq pa (trans (vlax-safearray->list pa) 0 1)
pb (trans (vlax-safearray->list pb) 0 1)
)
(list pa pb)
)
(defun cbox (e / box)
(setq box (ebox e))
(mid (car box) (cadr box))
)
(defun mid (p1 p2) (mapcar '* '(0.5 0.5 0.5) (mapcar '+ p1 p2)))
(defun mktext (str pt th)
(entmake (list '(0 . "TEXT")
(cons 1 str)
(cons 10 pt)
(cons 40 th)
(cons 11 pt)
(cons 71 0)
(cons 72 1)
(cons 73 2)
)
)
)
(defun str2lst ( str del / pos )
(if (setq pos (vl-string-search del str))
(cons (substr str 1 pos) (str2lst (substr str (+ pos 1 (strlen del))) del))
(list str)
)
)
(defun ptscen (Pts / )
(MAT:vxs (apply 'mapcar (cons '+ pts)) (/ 1.0 (length pts)))
)
(defun MAT:vxs ( v s )
(mapcar (function (lambda ( n ) (* n s))) v)
)
(defun dxf (key ename) (cdr (assoc key (entget ename))))
(defun 2epi ( e1 e2 mode / l r )
(setq obj1 (vlax-ename->vla-object e1)
obj2 (vlax-ename->vla-object e2)
l (vlax-invoke obj1 'intersectwith obj2 mode))
(repeat (/ (length l) 3)
(setq r (cons (list (car l) (cadr l) (caddr l)) r)
l (cdddr l)
)
)
(reverse r)
)
(defun p2ld (pt p1 p2 / )
(car (trans (mapcar '- pt p1) 0 (mapcar '- p2 p1)))
)
(defun gvp (e)
(vl-remove nil (mapcar '(lambda (x) (if (= (car x) 10) (trans (cdr x) 0 1))) (entget e)))
)
(defun mkline (pt1 pt2) (entmakex (list '(0 . "LINE") (cons 10 pt1) (cons 11 pt2))))
(defun new_ss (lastobj / ss obj)
(setq ss (ssadd))
(setq obj (entnext lastobj))
(while obj
(setq ss (ssadd obj ss))
(setq obj (entnext obj))
)
ss
)
(defun ss2lst ( ss / i l )
(if ss
(repeat (setq i (sslength ss))
(setq l (cons (ssname ss (setq i (1- i))) l))
)
)
)
(defun c:tt ( / a angint ar ar1 bang box cont dd dh dx e e0 ee h h1 lm lstr0 m1 n odlst p1 p2 pa pb pc pm pm1 pts ssn str tm w x)
(progn
(vl-load-com)
(setq odlst (mapcar 'getvar '("cmdecho" "osmode")))
(mapcar 'setvar '("cmdecho" "osmode") '(0 0))
(setq cont T)
(while cont
(setq str (getstring "\n输入面积划分表<800.22,200,330.45...>"))
(if (/= str "")(setq cont nil))
)
(setq lstr0 (mapcar 'atof (str2lst str ","))
n (apply '+ lstr0)
e (car (entsel "\n选择多段线:"))
p1 (getpoint "\n地块划分起点:")
p2 (getpoint p1 "\n划分方向:")
bang (angle p1 p2)
pc (ptscen (gvp e))
ar (Vlax-Get (Vlax-Ename->Vla-Object e) 'Area )
lstr0 (mapcar '(lambda(x) (* x (/ ar n))) lstr0)
lstr0 (reverse (cdr (reverse lstr0)))
angint (atof (angtos bang 0 4))
lm nil
ee (entlast)
)
(vl-cmdf "_.rotate" e "" pc (- 90. angint))
(setq box (ebox e)
p1 (car box)
p2 (cadr box)
)
(mapcar 'set '(w h) (mapcar '- p2 p1))
(vla-copy (vlax-ename->vla-object e))
(setq e0 (entlast))
(entdel e0)
)
(foreach a lstr0
(setq dh (/ a w)
pa (mapcar '+ p1 (list 0 dh))
pb (mapcar '+ p1 (list w dh))
tm (mkline (mapcar '- pa (list 10 0)) (mapcar '+ pb (list 10 0)))
pts (2epi tm e 0)
pm (mid (car pts) (last pts))
pm1 (mapcar '- pm (list 0 (* 0.5 dh)))
)
(vl-cmdf "boundary" "a" "b" "n" e tm "" "" pm1 "")
(setq m1 (entlast)
ar1 (Vlax-Get (Vlax-Ename->Vla-Object m1) 'Area )
dx (- a ar1)
dd (/ dx w 2.)
)
(while (not (equal dx 0 1e-3))
(mapcar 'entdel (list tm m1))
(setq pa (mapcar '+ pa (list 0 dd))
pb (mapcar '+ pb (list 0 dd))
tm (mkline pa pb)
pts (2epi tm e 0)
pm (mid (car pts) (last pts))
pm1 (mapcar '- pm (list 0 (* 0.5 dh)))
)
(vl-cmdf "boundary" "a" "b" "n" e tm "" "" pm1 "")
(setq m1 (entlast)
ar1 (Vlax-Get (Vlax-Ename->Vla-Object m1) 'Area )
dx (- a ar1)
dd (/ (abs dx) w 2.)
)
)
(vl-cmdf "boundary" "a" "b" "n" e tm "" "" (mapcar '+ pm (list 0 (* 0.5 dh))) "")
(mapcar 'entdel (list e tm m1))
(setq e (entlast)
h1 (abs (p2ld p1 pa pb))
p1 (mapcar '+ p1 (list 0 h1))
lm (cons pts lm)
)
)
(mapcar '(lambda(x) (mkline (car x) (cadr x))) lm)
(mapcar 'entdel (list e e0))
(setq ssn (new_ss ee))
(vl-cmdf "_.rotate" e0 ssn "" pc (- (- 90. angint)))
(mapcar 'setvar '("cmdecho" "osmode") odlst)
)
试试这 参考
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