请问，椭球程序错在哪里？
 

请问，椭球程序错在哪里？
www.dimcax.com
请问，椭球程序错在哪里？
图片：

;椭球
(defun c:tq()
(setq pt0 (getpoint "请输入基点: "))
(setq a (getreal "请输入长轴半径a: "))
(setq b (getreal "请输入短轴半径b: "))
(setq c (getreal "请输入纵轴半径c: "))
(setq ang -90)
(while (<= ang 90)
(setq ang1(/ (* pi ang) 180))
(setq a1 (+ (car pt0) (* a (cos ang1) )) )
(setq pt0y (cadr pt0))
(setq c0 (+ (caddr pt0)(* c (sin ang1) )) )
(setq b1 (* b (cos ang1)) )
(setq ang (+ 1 ang))
(setq pt1 (list -a1 pt0y c0))
(setq pt2 (list a1 pt0y c0))
(command "ellipse" pt1 pt2 b1)
)
)

看看标点符号之类的

图片：

错在ang改成-89就对了.
(defun c:tq()
(setq pt0 (getpoint "请输入基点: "))
(setq a (getreal "请输入长轴半径x方向a: "))
(setq b (getreal "请输入短轴半径y方向b: "))
(setq c (getreal "请输入纵轴半径z方向c: "))
(setq ang -89) ;错在-90 应为-89
(while (<= ang 89)
(setq ang1 (/ (* pi ang) 180))
(setq a1 (+ (car pt0) (* a (cos ang1) )) )
(setq pt0y (cadr pt0))
(setq c0 (+ (caddr pt0)(* c (sin ang1) )) )
(setq b1 (* b (cos ang1)) )
(setq ang (+ 1 ang))
(setq pt1 (list (* a1 -1.0) pt0y c0)) ;错-a1 应为(* a1 -1.0)
(setq pt2 (list a1 pt0y c0))
(command "ellipse" pt1 pt2 b1)
)
)
gbg

谢谢老顾了，我刚开始学习lisp,掌握的知识很少的，感谢你的讲解！