| 这或许是你要的,可自行再完善它  (defun c:test()  (setq txth (getvar "textsize"))  (setq dfc (getvar "dimlfac"))   (setq p1 (getpoint "\nFirst point:"))  (setq p2 (getpoint p1 "\nSecond point:"))  (setq len (distance p1 p2))  (setq pt (mapcar '+ p1 p2))  (setq pt (list (/ (car pt) 2)(/ (cadr pt) 2)))     (command "text" pt txth 90 (rtos (* len dfc) 2 3))) 
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