File: point.in.polygon.Rd

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r-cran-sp 1:0.9-66-1
 1234567891011121314151617181920212223242526272829303132333435 \name{point.in.polygon} \alias{point.in.polygon} \title{ do point(s) fall in a given polygon? } \description{ verifies for one or more points whether they fall in a given polygon } \usage{ point.in.polygon(point.x, point.y, pol.x, pol.y, mode.checked=FALSE) } \arguments{ \item{point.x}{numerical array of x-coordinates of points} \item{point.y}{numerical array of y-coordinates of points} \item{pol.x}{numerical array of x-coordinates of polygon} \item{pol.y}{numerical array of y-coordinates of polygon} \item{mode.checked}{default FALSE, used internally to save time when all the other argument are known to be of storage mode double} } \value{ integer array; values are: 0: point is strictly exterior to pol; 1: point is strictly interior to pol; 2: point lies on the relative interior of an edge of pol; 3: point is a vertex of pol. } \references{ Uses the C function InPoly(), in gstat file polygon.c; InPoly is Copyright (c) 1998 by Joseph O'Rourke. It may be freely redistributed in its entirety provided that this copyright notice is not removed. } \examples{ # open polygon: point.in.polygon(1:10,1:10,c(3,5,5,3),c(3,3,5,5)) # closed polygon: point.in.polygon(1:10,rep(4,10),c(3,5,5,3,3),c(3,3,5,5,3)) } \keyword{manip}