;;CADALYST 12/03 AutoLISP Solutions SPLINE-TO-PLINE.LSP
;;(c) 2003 Tony Hotchkiss

(defun spline-to-pline (/ i)
(vl-load-com)
(setq *thisdrawing* (vla-get-activedocument
(vlax-get-acad-object)
) ;_ end of vla-get-activedocument
*modelspace* (vla-get-ModelSpace *thisdrawing*)
) ;_ end of setq
(setq spline-list (get-spline))
(setq i (- 1))
(if spline-list
(progn
(setq msg "\nNumber of segments : ")
(initget 6)
(setq num (getint msg))
(if (or (= num 100) (= num nil))
(setq num 100)
) ;_ end of if
(repeat (length spline-list)
(setq splobj (nth (setq i (1+ i)) spline-list))
(convert-spline splobj num)
) ;_ end of repeat
) ;_ end of progn
) ;_ end of if
) ;_ end of spline-to-pline

(defun get-spline (/ spl-list obj spline no-ent i)
(setq spl-list nil
obj nil
spline "AcDbSpline"
selsets (vla-get-selectionsets *thisdrawing*)
ss1 (vlax-make-variant "ss1")
) ;_ end of setq
(if (= (vla-get-count selsets) 0)
(setq ssobj (vla-add selsets ss1))
) ;_ end of if
(vla-clear ssobj)
(setq no-ent 1)
(while no-ent
(prompt "\nSelect splines: ")
(vla-Selectonscreen ssobj)
(if (> (vla-get-count ssobj) 0)
(progn
(setq no-ent nil)
(setq i (- 1))
(repeat (vla-get-count ssobj)
(setq
obj (vla-item ssobj
(vlax-make-variant (setq i (1+ i)))
) ;_ end of vla-item
) ;_ end of setq
(cond
((= (vlax-get-property obj "ObjectName") spline)
(setq spl-list
(append spl-list (list obj))
) ;_ end of setq
)
) ;_ end-of cond
) ;_ end of repeat
) ;_ end of progn
(prompt "\nNo entities selected, try again.")
) ;_ end of if
(if (and (= nil no-ent) (= nil spl-list))
(progn
(setq no-ent 1)
(prompt "\nNo splines selected.")
(quit)
) ;_ end of progn
) ;_ end of if
) ;_ end of while
(vla-delete (vla-item selsets 0))
spl-list
) ;_ end of get-spline

(defun convert-spline (splobj n / i)
(setq point-list nil
2Dpoint-list nil
z-list nil
spl-lyr (vlax-get-property splobj 'Layer)
startSpline (vlax-curve-getStartParam splobj)
endSpline (vlax-curve-getEndParam splobj)
i (- 1)
) ;_ end of setq
(repeat (+ n 1)
(setq i (1+ i))
(setq p (vlax-curve-getPointAtParam
splobj
(* i
(/ (- endspline startspline) n)
) ;_ end of *
) ;_ end of vlax-curve-getPointAtParam
) ;_ end of setq
(setq 2Dp (list (car p) (cadr p))
2Dpoint-list (append 2Dpoint-list 2Dp)
point-list (append point-list p)
z (caddr p)
z-list (append z-list (list z))
) ;_ end of setq
) ;_ end of repeat
(setq summ (apply '+ z-list))
(setq arraySpace
(vlax-make-safearray
vlax-vbdouble ; element type
(cons 0
(- (length point-list) 1)
) ; array dimension
) ;_ end of vlax-make-safearray
) ;_ end of setq
(setq vert-array (vlax-safearray-fill arraySpace point-list))
(vlax-make-variant vert-array)
(if (and (= :vlax-true (vlax-get-property splobj 'IsPLanar))
(= summ 0.0)
) ;_ end of and
(setq plobj (add-polyline
2Dpoint-list
vla-AddLightweightPolyline
) ;_ end of add-polyline
) ;_ end of setq
(setq plobj (add-polyline
point-list
vla-Add3DPoly
) ;_ end of add-polyline
) ;_ end of setq
) ;_ end of if
(vlax-put-property plobj 'Layer spl-lyr)
(vla-delete splobj)
(vlax-release-object splobj)
) ;_ end of convert-spline

(defun add-polyline (pt-list poly-func)
(setq arraySpace
(vlax-make-safearray
vlax-vbdouble
(cons 0
(- (length pt-list) 1)
) ; array dimension
) ;_ end of vlax-make-safearray
) ;_ end of setq
(setq vertex-array
(vlax-safearray-fill arraySpace pt-list)
) ;_ end of setq
(vlax-make-variant vertex-array)
(setq plobj (poly-func
*modelspace*
vertex-array
) ;_ end of poly-func
) ;_ end of setq
) ;_ end of add-polyline

(defun c:s2p ()
(spline-to-pline)
(princ)
) ;_ end of c:s2p

(prompt
"SPLINE-TO-PLINE by Tony Hotchkiss. Enter S2P to start"
) ;_ end of prompt
(c:s2p)

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