MathGroup Archive: February 2009 [00212]

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testing if a point is inside a polygon

To: mathgroup at smc.vnet.net
Subject: [mg96189] testing if a point is inside a polygon
From: Mitch Murphy <mitch at lemma.ca>
Date: Mon, 9 Feb 2009 05:32:10 -0500 (EST)

is there a way to test whether a point is inside a polygon? ie.

	PointInsidePolygonQ[point_,polygon_] -> True or False

i'm trying to do something like ...

	ListContourPlot[table,RegionFunction->CountryData["Canada","Polygon"]]

to create what would be called a "clipping mask" in photoshop.

cheers,
Mitch

Follow-Ups:
- Re: Re: Re: testing if a point is
  - From: DrMajorBob <btreat1@austin.rr.com>
- Re: Re: Re: testing if a point is
  - From: DrMajorBob <btreat1@austin.rr.com>
- Re: testing if a point is inside a polygon
  - From: Adriano Pascoletti <adriano.pascoletti@dimi.uniud.it>
- Re: testing if a point is inside a polygon
  - From: Frank Scherbaum <Frank.Scherbaum@geo.uni-potsdam.de>

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