Question

求lisp程序，根据圆自动绘制圆弧

详细要求见附图，要求加载lisp程序后，我输入yh后，点击屏幕中原，自动画圆弧并自动填充，能自动画圆弧是基本要求，能自动填充更好，如果能同时选择多个圆并填充更好。
(defun C:YH(/ origin radius i-radius half-r origin-x origin-y os) (setq ent (car (entsel "\n请选择圆>")));提取实体圆 (setq entdata (entget ent(list "*"))) (setq origin (cdr (assoc 10 entdata)));;提取圆心点坐标 (setq radius (cdr (assoc 40 entdata)));;提取圆半径 (setq half-r (/ radius 2)) (setq sep (/ radius 5)) (setq sepp (* sep 4)) (setq origin-x (car origin)) ;取中心点的X坐标值 (setq origin-y (cadr origin)) ;取中心点的Y坐标值 (command "ARC" ;圆圆弧命令 (list origin-x (+ origin-y radius)) ;圆弧起点 (list (- origin-X SEPP) origin-y) (list origin-x (- origin-y radius)) ;圆弧终点 ) (princ) ;静默退出 )

我上面弄的，只能达到基本要求，求实现能自动填充，并一开始就能同时选择多个圆。

Answer 1

;用下面程序一试
(defun C:YH()
(setq cm (getvar "cmdecho")
os (getvar "osmode")
)
(setvar "cmdecho" 0)
(command "_undo" "be")
(princ "\n请选择圆")
(if (setq ssa (ssget '((0 . "circle"))))
(progn
(setvar "osmode" 0)
(setq n (sslength ssa) i 0)
(repeat n
(setq ent (ssname ssa i)
dxf (entget ent)
r (cdr (assoc 40 dxf))
po (cdr (assoc 10 dxf))
i (1+ i)
)

(setq p1 (mapcar '+ po (list 0.0 r))
p2 (mapcar '+ po (list (* (1- 0.2) r) 0.0))
p3 (mapcar '+ po (list 0.0 (- r)))
p4 (mapcar '+ po (list (* (1- 0.1) r) 0.0))
)
(command "_arc" p1 p2 p3)
(command "_bhatch" "p" "ANSI31" (* 0.04 r) "" p4 "")
)
)
)
(command "_undo" "e")
(setvar "osmode" os) (setvar "cmdecho" cm)
(princ)
)