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- ;;¼ò½àд·¨
- (defun getplarea (l)
- (* 0.5
- (apply '+
- (mapcar '(lambda (a b)
- (- (* (car a) (cadr b)) (* (car b) (cadr a)))
- )
- l
- (append (cdr l) (list (car l)))
- )
- )
- )
- )
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- (defun vxs (e / i v lst)
- (setq i -1)
- (while
- (setq v (vlax-curve-getpointatparam e (setq i (1+ i))))
- (setq lst (cons v lst))
- )
- (reverse lst)
- )
2¡¢ÊäÈ롺µ÷ÕûºóÃæ»ý¡»area-n
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;;164.19 [¹¦ÄÜ] ¶à¶ÎÏßËùµã»÷µã×î½üµÄÒ»¸ö¶¥µã
=>µÃµ½ÒªÒƶ¯µÄ×î½üµã
;;164.18 [¹¦ÄÜ] ¶à¶ÎÏßËùµã»÷×ӶεÄÁ½¶ËµãÁбí
=>µÃµ½ÒªÒƶ¯×î½üµãµÄÑ¡Ôñ±ßµÄ¶þ¸ö¶Ëµã ps¡¢pe
4¡¢ÓɵÚ1²½ÖèµÃµ½µÄµã±íptlistÒƳýÒªÒƶ¯µÄ¶¥µã£¬ÖØÐÂÓÃÐÐÁÐʽµÃµ½¡ºÒƳýÒƶ¯µãºóµÄÃæ»ý¡»area-o2
Ãæ»ý²î [area-m]=[area-o2] - [area-n]
5¡¢ÓÉÒƶ¯µãµÄλÖõõ½Ç°¡¢ºóµÄ¶þ¸öµãΪsp¡¢ep£¬²¢»Ö±Ïßline (e1)
ÒÔÃæ»ý²î[area-m]=1/2*B*h =>h
offset Ö±Ïßsp-ep£¬Æ«ÒÆÁ¿=h =>»ñÈ¡Éú³ÉºóµÄÖ±ÏßÎï¼þ (e2)
µÃµ½e2 µÄ¶þ¸ö¶Ëµã p1¡¢p2
6¡¢ÀûÓà (setq pt (inters ps pe sp-el ep-el nil))£¬µÃµ½±ßÉϵĽ»µãpt
7¡¢ÀûÓÃsubst¸üеã±í£¬Íê³É¡£
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area-m=1/2*(a+h*tan(¦È1)+a+h*tan(¦È2))*h
(tan(¦È1)+tan(¦È2))*h^2+2a*h-2*area-m=0
=>½â1Ôª2´Î·½³Ìʽ
h+={-2a+[(2a)^2-4*(tan(¦È1)+tan(¦È2))(-2*area-m)]^1/2}/[2*)tan(¦È1)+tan(¦È2))]
h-={-2a-[(2a)^2-4*(tan(¦È1)+tan(¦È2))(-2*area-m)]^1/2}/[2*(tan(¦È1)+tan(¦È2))]£¬Õâ¸ö½âÊǸºÊý²»ºÏ¡£
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