l_shiqiang 发表于 2006-6-12 11:42:00

怎样求得任意两条线的中心线

<P>任意点选两条线，自动绘出这两条线的中心线</P>
<P>谢谢！</P>

liu_kunlun 发表于 2006-6-13 18:36:00

(defun c:cen (/ e1 e2 p11 p12 p21 p22 ag1 ag2 agc p11d p12d pbg pend p)&nbsp;&nbsp; <BR>&nbsp;&nbsp; (if (and (print "选择第一条直线:")<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; (setq e1 (car (entsel)))<BR>&nbsp;&nbsp;&nbsp;&nbsp; (= "LINE" (cdr (assoc 0 (setq e1 (entget e1)))))<BR>&nbsp;&nbsp;&nbsp;&nbsp; (print "选择第二条直线:")<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; (setq e2 (car (entsel)))<BR>&nbsp;&nbsp;&nbsp;&nbsp; (= "LINE" (cdr (assoc 0 (setq e2 (entget e2)))))<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; )<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; (progn&nbsp;&nbsp; <BR>&nbsp;&nbsp; (setq p11 (cdr (assoc 10 e1)) p12&nbsp; (cdr (assoc 11 e1))<BR>&nbsp;&nbsp;p21 (cdr (assoc 10 e2)) p22&nbsp; (cdr (assoc 11 e2))<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ag1 (angle p11 p12)&nbsp;&nbsp;&nbsp;&nbsp; ag2 (angle p21 p22)<BR>&nbsp;&nbsp; )<BR>&nbsp;&nbsp; (if (&lt; (cos (- ag2 ag1)) 0)<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; (setq p p21 p21 p22 p22 p<BR>&nbsp;&nbsp;&nbsp;&nbsp; ag2 (angle p21 p22)<BR>&nbsp;&nbsp; )&nbsp; )&nbsp;&nbsp; <BR>&nbsp;&nbsp; (setq agc (- ag2 ag1)<BR>&nbsp;&nbsp;agc (if (&lt; agc 0) (+ agc (* 2 pi)) agc)<BR>&nbsp;&nbsp;agc (+ ag1 (/ agc 2.) (/ pi 2.))&nbsp;&nbsp; <BR>&nbsp;&nbsp;p11d (inters p11 (polar p11 agc 1000.) p21 p22 nil)<BR>&nbsp;&nbsp;p12d (inters p12 (polar p12 agc 1000.) p21 p22 nil)<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; pbg (mapcar '+ p11 p11d)&nbsp; pbg (mapcar '/ pbg '(2. 2. 2.))<BR>&nbsp;&nbsp;pend (mapcar '+ p12 p12d) pend (mapcar '/ pend'(2. 2. 2.))<BR>&nbsp;&nbsp; )&nbsp;&nbsp; <BR>&nbsp;&nbsp; (entmake (list '(0 . "LINE") (cons 10 pbg) (cons 11 pend)))<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; )<BR>&nbsp;&nbsp; )&nbsp;&nbsp; <BR>&nbsp;&nbsp; (princ)<BR>)&nbsp;&nbsp;
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