为个程序不是很明白,能不能请楼上的高手给注解一下? (DEFUN GET-PointList-4pt(PT_LIST / PT1A PT1B PT2A PT2B) (setq pt3(LIST(apply 'max (mapcar '(lambda (x) (car X)) PT_LIST)) (apply 'max (mapcar '(lambda (x) (caDr X)) PT_LIST)))  T1(LIST(apply 'mIN (mapcar '(lambda (x) (car X)) PT_LIST)) (apply 'mIN (mapcar '(lambda (x) (caDr X)) PT_LIST)))) (list PT1 (LIST (car pt3)(cadr PT1))pt3(LIST (car PT1)(cadr pt3))) ;点表四个点[<左下角点> <右下角点> <右上角点> <左上角点>] ) |