但是仅有两个点是无法确定唯一的坐标系的,以这两点的连线为轴会有无数个坐标系可以满足! 三点确定一个平面,同样要确定唯一坐标系也是需要三点的!
代码给你,如果第三点不确定,只能保证给定的两点转换后坐标是对的!
(defun c:ducs()
(setq os (getvar "osmode"))
(setq cm (getvar "cmdecho"))
(setvar "osmode" 9)
(setvar "cmdecho" 0)
(command "ucs" "w")
(setq p1 (getpoint "\n请选取第一点P1:"))
(setq p2 (getpoint "\n请选取第二点P2:"))
(setq p3 (getpoint "\n请选取第三点P3:"))
(setvar "osmode" 0)
(initget 1 )
(setq s1 (getpoint "\n请输入第一点P1实际坐标x1,y1,z1:"))
(initget 1 )
(setq s2 (getpoint "\n请输入第二点P2实际坐标x2,y2,z2:"))
(initget 1 )
(setq s3 (getpoint "\n请输入第三点P3实际坐标x3,y3,z3:"))
(setq l1 (distance p1 p2))
(setq l2 (distance s1 s2))
(setq x "Yes")
(if (> (abs (- l1 l2)) 1);误差控制
(progn
(alert "数据误差较大请点{确定}后选择是否继续")
(initget 1 "Yes No")
(setq x (getkword "\n是否继续? (Yes 或 No)"))
)
)
(IF (= "Yes" X)
(progn
(setq ltm (ssadd))
(command "line" "0,0,0" "1,0,0" "")
(ssadd (entlast) ltm)
(command "line" "0,0,0" "0,1,0" "")
(ssadd (entlast) ltm)
(command "align" ltm "" s1 p1 s2 p2 s3 p3)
(setq LINDAT (ssname ltm 0))
(setq LINdate (entget LINDAT))
(setq uc1 (cdr (assoc '10 LINdate)))
(setq uc2 (cdr (assoc '11 LINdate)))
(setq LINDAT (ssname ltm 1))
(setq LINdate (entget LINDAT))
(setq uc3 (cdr (assoc '11 LINdate)))
(command "erase" ltm "")
(command "ucs" "3" uc1 uc2 uc3)
)
)
(setvar "osmode" os)
(setvar "cmdecho" cm)
(princ)
)
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