三种曲线的画法,LISP语言
;画正弦曲：x=a , y=sin a ;(defun c:zxqx(/ da bp Ai lpt bp1 bp2)
(initget 1)
(setq bp (getpoint "\n 起始点?:"))
(initget 7)
(setq da (getangle "\n 角度增量?:"))
(setq Ai 0 Ae (* pi 2.0) bp1 (car bp) bp2 (car (cdr bp)))
(while (< Ai Ae)
(setq lpt (append lpt (list (list (+ bp1 Ai) (+ bp2 (sin Ai))))))
(setq Ai (+ Ai da))
)
(setq lpt (append lpt (list (list (+ bp1 Ae) (+ bp2 (sin Ae))))))
(setvar "cmdecho" 0)
(command "pline")
(foreach pt lpt (command pt))
(command ^c)
(command "pedit" "l" "f")
(command ^c)
(setvar "cmdecho" 1)
) ;渐开线画法x=br*(cos(a)+a*sin(a))
y=br*(sin(a)-a*cos(a));
(defun c:jkx(/ ti lpt ae pt bp1 bp2)
(initget 1)
(setq bp (getpoint "\n 起始点?:"))
(initget 7)
(setq br (getreal "\n 基圆半径?:"))
(initget 5)
(setq ai (getangle "\n 起始角度?:"))
(initget 7)
(setq ae (getangle "\n 终止角度?:"))
(initget 7)
(setq da (getangle "\n 角度增量?:"))
(setq bp1 (car bp) bp2 (car (cdr bp)))
(while (< ai ae)
(setq lpt (append lpt (list (list (+ bp1 (* br (+ (cos ai) (* ai (sin ai))))) (+ bp2 (* br (- (sin ai) (* ai (cos ai)))))))))
(setq ai (+ ai da))
)
(setq lpt (append lpt (list (list (+ bp1 (* br (+ (cos ae) (* ae (sin ae))))) (+ bp2 (* br (- (sin ae) (* ae (cos ae)))))))))
(setvar "cmdecho" 0)
(command "pline")
(foreach pt lpt (command pt))
(command ^c)
(command "pedit" "l" "f")
(command ^c)
(setvar "cmdecho" 1)
) 螺旋线画法：x=r*cos(2pi/k) , y=r*sin(2pi/k) , z=(+/-)s/k .
; s:导程（+=右旋，-=左旋），k：每圈等分数。
(defun c:yzlxx(/ bp r a s k n bp1 bp2 bp3 dmax di da pt lpt)
(initget 1)
(setq bp (getpoint "\n 螺旋线中心："))
(initget 7)
(setq r (getdist bp "\n 螺旋线半径："))
(initget 3)
(setq s (getreal "\n 导程：(+/右旋,-/左旋)"))
(initget 7)
(setq n (getreal "\n 圈数："))
(initget 6)
(setq k (getint "\n 每圈等分数<36>：(宜取36的整倍数)"))
(if (not k) (setq k 36))
(setq bp1 (car bp) bp2 (cadr bp) bp3 (caddr bp))
(setq dmax (fix(* k n)))
(setq da (/(* 2 pi) k))
(setq a 0)
(setq di 0)
(while (<= di dmax)
(setq lpt (append lpt (list (list (+ bp1 (* r (cos a))) (+ bp2 (* r (sin a))) (+ bp3 (* (/ s k) di))))))
(setq di (+ di 1))
(setq a (+ da a))
)
(setvar "cmdecho" 0)
(command "3dpoly")
(foreach pt lpt (command pt))
(command ^c)
(setvar "cmdecho" 1)
) 楼主～您这贴确实值得顶一下～ 好东西!! 请教楼主一个问题，如何将一张图中所有直线的端点坐标导出到EXCEL中呢
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