AutoCAD 二次开发 AutoLISP画图 题目：和的平方、极坐标四叶曲线、阿基米德螺旋线

(defun c:xinzhi ( / n n1 n2 s)      ;该数的平方分成两个两位数，它们的和等于该数本身。
  (setq n 10)
  (while (<= n 99) (setq n1 (/ ( * n n ) 100))
   (setq n2 ( - ( * n n ) (* n1 100)))
  (setq s (+ n1 n2))
  (if (= s n) (princ (strcat "\n" (rtos n)))
         )                      ;if_end
   (setq n (+ n 1))
  )                             ;while_end
    (princ)
)                             ;end

(command "pline" )      ;画极坐标方程R=1+2cos(2θ)在[0, 2π]内的曲线
(setq n 0)
(repeat 3600
(command (polar (list 0 0) (/ n 57.3) ( + 1 ( * 2 ( cos ( * 2 (/ n 57.3) ) ) ) ) ))
(setq n ( + 0.1 n))
)
(command) 

(command "pline" )          ;绘制阿基米德螺旋线
(setq n 0)
(repeat 1000
(command (polar (list 0 0) (/ n 57.3) n))
(setq n (1+ n))
)
(command)