find spot within polygon

Hello,

I am looking for an algorithm to check if a certain point is within a
closed polygon or not. I have searched the Openmap classes, but have not
found anything that looks like that. Have I missed it?
 
It does not seem easy to me, as the polygon can be any shape (basically
following esri´s rules). Does anyone have a hint for me?

Thanks,
Chris van Lith

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