pline intersecting itself

hi,

how can I check if a polyline is intersecting itself? I tried the intersectwith option on itself but it gives a type mismatch.

thanks in advance for any help,

Emmanuel

 

Can we see your code please?

Regards

Wayne Ivory
IT Analyst Programmer
Wespine Industries Pty Ltd

 

dim Pi as variant
dim pl as acadLWpolyline

Pi=pl.intersectWith(pl,acExtendNone)

 

Well, I ran your code (assigning a particular polyline to pl with HandleToObject) and didn't get any errors so I'm not sure why you're having a problem.

Mind you, the results are probably not what you were hoping for anyway. Pi returned the coordinates for all the vertices. (This particular polyline doesn't overlap itself so possibly if it did you would get extra values returned which you could compare to the vertices.)

Regards

Wayne

 

Hi Emmanuel

Make a temporary copy by copy method, explode both, get intersections between
each segment:
- no intersection -> nothing
- 2 intersections and equal endpopints -> nothing
- 1 intersection equal Endpoint -> collect
- n intersections not equal Endpoint -> collect
Disadvantage:
If you've intersections they are exactly on both endpoints the method will fail.

Cheers

 

Correction:

Explode the pline twice, no copy necessary...

Cheers