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Re: Point inside/outside a polygon?
"Dennis Boccippio" <email@example.com> wrote in message
> 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...
> Dennis Boccippio
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
vertex, or completely inside or outside the specified polygon. And it's also
good in three dimensions. See the IDLanROIGroup class for extended