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points at vertixes and inbetween???


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I found this code:

(defun c:ppav ()


(setq *model-space* (vla-get-modelspace (vla-get-activedocument (vlax-get-acad-object))))

(setq obj (vlax-ename->vla-object (car (entsel))))

(setq c (vlax-get obj "Coordinates") i 0)

(repeat (/ (length c) 2)

(setq x (nth i c) y (nth (1+ i) c))

(vla-addpoint *model-space* (vlax-3d-point (list x y 0.0)))

(setq i (+ i 2))

(setq temp (osnap (list x y) "mid")) ; I added this

(command "point" temp) ; and this





and added the two lines to try and get points set on the midpoints of the pline segments....but it does not work as intended. Some midpoints are set on the wrong segment and 1 extra point is being set.


Can Anyone Help?



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Instead, consider using the vlax-curve* functions on the *Line's Object/Ename.


For example, I think you'll find the vlax-curve-getDistAtParam, and vlax-curve-getParamAtDist functions to be of use.

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Firstly, a warm welcome to CADTutor Ray :)


I would suggest the vlax-curve-getpointatparam function since the vertices of an LWPolyline have integer parameters, and hence the midpoints can be found at the half values of the parameters.


Here is some quickly written code:


(defun c:test ( / e i p s ) (vl-load-com)
 (if (setq s (ssget '((0 . "LWPOLYLINE"))))
   (repeat (setq i (sslength s))
     (repeat (1+ (fix (* 2 (vlax-curve-getendparam (setq p -0.5 e (ssname s (setq i (1- i))))))))
       (entmakex (list (cons 0 "POINT") (cons 10 (vlax-curve-getpointatparam e (setq p (+ p 0.5))))))

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