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3. (defun c:pwx ()
(setq pt1 (getpoint"\nThe first point, please"))
(setq pt2 (getpoint"\nThe second point,please"))
(setq pt3 (getpoint"\nThe third point,please"))
(setq n (getdist "\nSegment number"))
(setq f (open "pwx.inp" "w"))
(print (car pt1) f)
(print (cadr pt1) f)
(print (car pt2) f)
(print (cadr pt2) f)
(print (car pt3) f)
(print (cadr pt3) f)
(print fdx f)
(close f)
(command "shell" "pwx")
(setq f (open "pwx.dat" "r"))
(setq a (atof (read-line f)))
(setq b (atof (read-line f)))
(setq c (atof (read-line f)))
(close f)
(setq dx (- (car pt3) (car pt1)))
;(setq n (fix (/ (+ (abs dx) 0.5) fdx)))
(setq ddx (/ dx n))
(command "pline" pt1)
(setq i 1)
(while (<= i n)
(setq x (+ (car pt1) (* ddx i)))
(setq y (+ (* a x x) (* b x) c))
(setq pt (list x y))
(command pt)
(setq i (1+ i))
(command "")
)
(defun break (message / loop)
(princ message) (setq loop t)
(while loop (princ "\n>:")
(setq query (read-line)) (if (/= query "")
(princ (eal (read query))) (setq loop nil)
) (princ)
)
用LISP程序画阿基米德螺线的程序如下:
AJMD.LSP
(defun func (hansu / p x0 y0 s e d v p1 p2)
(initget 1)
(setq sp (getpoint "\n输入中心点: "))
(setq x0 (car sp))
(setq y0 (cadr sp))
(setq s (getreal "\n起始角度(弧度值)<0>:"))
(if (not s) (setq s 0.0))
(setq e (getreal "\n终端角度(弧度值)<2pi>:"))
(if (not e) (setq e (* 2 pi)))
(setq d (getreal "\n步长(弧度值)<0.1>:"))
(if (not d) (setq d 0.1))
(setq r (getreal "\n半径(mm)<20.0>:"))
(if (not r) (setq r 20.0))
(setq v s p1 (hansu v))
(while (< v (+ e 0.001))
(setq v (+ v d) p2 (hansu v))
(command "line" p1 p2 "")
(setq p1 p2)
)
)
(defun ajmd (b / x y)
(setq x (+ x0 (* r b (cos b))) y (+ y0 (* r b (sin b))))
(list x y)
)
(defun c:ajmd()
(func ajmd)
(redraw)
(princ)
)
(setq pt1 (getpoint"\nThe first point, please"))
(setq pt2 (getpoint"\nThe second point,please"))
(setq pt3 (getpoint"\nThe third point,please"))
(setq n (getdist "\nSegment number"))
(setq f (open "pwx.inp" "w"))
(print (car pt1) f)
(print (cadr pt1) f)
(print (car pt2) f)
(print (cadr pt2) f)
(print (car pt3) f)
(print (cadr pt3) f)
(print fdx f)
(close f)
(command "shell" "pwx")
(setq f (open "pwx.dat" "r"))
(setq a (atof (read-line f)))
(setq b (atof (read-line f)))
(setq c (atof (read-line f)))
(close f)
(setq dx (- (car pt3) (car pt1)))
;(setq n (fix (/ (+ (abs dx) 0.5) fdx)))
(setq ddx (/ dx n))
(command "pline" pt1)
(setq i 1)
(while (<= i n)
(setq x (+ (car pt1) (* ddx i)))
(setq y (+ (* a x x) (* b x) c))
(setq pt (list x y))
(command pt)
(setq i (1+ i))
(command "")
)
(defun break (message / loop)
(princ message) (setq loop t)
(while loop (princ "\n>:")
(setq query (read-line)) (if (/= query "")
(princ (eal (read query))) (setq loop nil)
) (princ)
)
用LISP程序画阿基米德螺线的程序如下:
AJMD.LSP
(defun func (hansu / p x0 y0 s e d v p1 p2)
(initget 1)
(setq sp (getpoint "\n输入中心点: "))
(setq x0 (car sp))
(setq y0 (cadr sp))
(setq s (getreal "\n起始角度(弧度值)<0>:"))
(if (not s) (setq s 0.0))
(setq e (getreal "\n终端角度(弧度值)<2pi>:"))
(if (not e) (setq e (* 2 pi)))
(setq d (getreal "\n步长(弧度值)<0.1>:"))
(if (not d) (setq d 0.1))
(setq r (getreal "\n半径(mm)<20.0>:"))
(if (not r) (setq r 20.0))
(setq v s p1 (hansu v))
(while (< v (+ e 0.001))
(setq v (+ v d) p2 (hansu v))
(command "line" p1 p2 "")
(setq p1 p2)
)
)
(defun ajmd (b / x y)
(setq x (+ x0 (* r b (cos b))) y (+ y0 (* r b (sin b))))
(list x y)
)
(defun c:ajmd()
(func ajmd)
(redraw)
(princ)
)
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