[编程交流] LISP获取单个l的长度

(defun c:foo ( / s e )
 (princ "\n Pick on one line to get its length :")
 (if (setq s (ssget "_+.:S:E" '((0 . "LINE"))))
     (princ (strcat "\n Total Length is : " (rtos (distance (cdr (assoc 10 (setq e (entget (ssname s 0))))) (cdr (assoc 11 e))) 2)))
   )
 (princ)
 )

[b][color=BLACK]([/color][/b]defun linelength [b][color=FUCHSIA]([/color][/b]e / ed p10 p11 d2 d3[b][color=FUCHSIA])[/color][/b]
[b][color=FUCHSIA]([/color][/b]and [b][color=NAVY]([/color][/b]= [b][color=MAROON]([/color][/b]type e[b][color=MAROON])[/color][/b] 'ENAME[b][color=NAVY])[/color][/b]
     [b][color=NAVY]([/color][/b]setq ed [b][color=MAROON]([/color][/b]entget e[b][color=MAROON])[/color][/b][b][color=NAVY])[/color][/b]
     [b][color=NAVY]([/color][/b]= [color=#2f4f4f]"LINE"[/color] [b][color=MAROON]([/color][/b]cdr [b][color=GREEN]([/color][/b]assoc 0 ed[b][color=GREEN])[/color][/b][b][color=MAROON])[/color][/b][b][color=NAVY])[/color][/b]
     [b][color=NAVY]([/color][/b]setq p10 [b][color=MAROON]([/color][/b]cdr [b][color=GREEN]([/color][/b]assoc 10 ed[b][color=GREEN])[/color][/b][b][color=MAROON])[/color][/b]
           p11 [b][color=MAROON]([/color][/b]cdr [b][color=GREEN]([/color][/b]assoc 11 ed[b][color=GREEN])[/color][/b][b][color=MAROON])[/color][/b][b][color=NAVY])[/color][/b]
     [b][color=NAVY]([/color][/b]setq d3 [b][color=MAROON]([/color][/b]distance p10 p11[b][color=MAROON])[/color][/b][b][color=NAVY])[/color][/b]
     [b][color=NAVY]([/color][/b]setq d2 [b][color=MAROON]([/color][/b]distance [b][color=GREEN]([/color][/b]list [b][color=BLUE]([/color][/b]car p10[b][color=BLUE])[/color][/b] [b][color=BLUE]([/color][/b]cadr p10[b][color=BLUE])[/color][/b][b][color=GREEN])[/color][/b]
                        [b][color=GREEN]([/color][/b]list [b][color=BLUE]([/color][/b]car p11[b][color=BLUE])[/color][/b] [b][color=BLUE]([/color][/b]cadr p11[b][color=BLUE])[/color][/b][b][color=GREEN])[/color][/b][b][color=MAROON])[/color][/b][b][color=NAVY])[/color][/b][b][color=FUCHSIA])[/color][/b]
d3[b][color=BLACK])[/color][/b]
[color=#8b4513]; [b][color=BLACK]([/color][/b]defun       [b][color=BLACK])[/color][/b] : define a local function[/color]
[color=#8b4513];  [b][color=BLACK]([/color][/b]e /          : supply 1 parameter to the function[/color]
[color=#8b4513];  / ed p10 p11 d2 d3[b][color=BLACK])[/color][/b] : declare  variables local to this function only[/color]
[color=#8b4513];  [b][color=BLACK]([/color][/b]and        [b][color=BLACK])[/color][/b] : inclusive testing - continue evaluating until a nil is returned or test complete[/color]
[color=#8b4513];  [b][color=BLACK]([/color][/b]type       [b][color=BLACK])[/color][/b] : test for the the type of the parameter[/color]
[color=#8b4513];  [b][color=BLACK]([/color][/b]entget     [b][color=BLACK])[/color][/b] : get an entity definition[/color]
[color=#8b4513];  [b][color=BLACK]([/color][/b]distance   [b][color=BLACK])[/color][/b] : calculate the true distance between 2 points[/color]
[color=#8b4513];                : if both points have X Y & Z values, return the 3D distance[/color]
[color=#8b4513];                : if either point has only X & Y values, return the 2D distance[/color]
[color=#8b4513];  d3            : return the 3D value or nil if an error occurred[/color]

[b][color=BLACK]([/color][/b]prin1 [b][color=FUCHSIA]([/color][/b]linelength [b][color=NAVY]([/color][/b]entlast[b][color=NAVY])[/color][/b][b][color=FUCHSIA])[/color][/b][b][color=BLACK])[/color][/b]