Re: testing if a point is inside a polygon
- To: mathgroup at smc.vnet.net
- Subject: [mg96238] Re: testing if a point is inside a polygon
- From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
- Date: Tue, 10 Feb 2009 05:49:03 -0500 (EST)
- References: <gmp0mt$btn$1@smc.vnet.net>
Hi, the web is full of this test as well as any graphics book. Look at http://local.wasp.uwa.edu.au/~pbourke/geometry/insidepoly/ http://tog.acm.org/editors/erich/ptinpoly/ Regards Jens Mitch Murphy wrote: > 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 >