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Re: Point inside/outside a polygon? [message #26264 is a reply to message #26180]

Fri, 10 August 2001 17:40

Jim Pendleton
Messages: 13
Registered: July 2001

Junior Member

"Dennis Boccippio" <djboccip@hotmail.com> wrote in message
news:djboccip-ECCC8D.11144210082001@news.mia.bellsouth.net.. .
> Hi all,
>
> Does anyone know of IDL routines for determination of whether a point
> datum is inside/outside a closed irregular polygon? I'm told that some
> variants of this functionality are available in Matlab and Mathematica,
> was curious if anyone had implemented a solution for IDL. My usual
> kludge to this is polyfill/mask-based, which is probably a very
> inefficient approach...
>
> Thanks,
>
> Dennis Boccippio
>

Hi Dennis,

The IDLanROI class has a method named "ContainsPoints" to perform this
operation efficiently. It will let you know if a point lies exactly on an
edge or
vertex, or completely inside or outside the specified polygon. And it's also
good in three dimensions. See the IDLanROIGroup class for extended
functionality.

Jim P.

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[Message index]

		Point inside/outside a polygon? By: Dennis Boccippio on Fri, 10 August 2001 09:14
		Re: Point inside/outside a polygon? By: James Kuyper on Mon, 13 August 2001 09:07
		Re: Point inside/outside a polygon? By: Andy Loughe on Mon, 13 August 2001 08:12
		Re: Point inside/outside a polygon? By: Mark Fardal on Fri, 10 August 2001 21:48
		Re: Point inside/outside a polygon? By: Jim Pendleton on Fri, 10 August 2001 17:40
		Re: Point inside/outside a polygon? By: Med Bennett on Fri, 10 August 2001 16:24

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