intersectPolyCircle: Intersection of a Polygonal and a Circular Domain

In jimhester/surveillance: Temporal and Spatio-Temporal Modeling and Monitoring of Epidemic Phenomena

Description

This is a unifying wrapper around functionality of various packages dealing with spatial data. It computes the intersection of a circular domain and a polygonal domain (whose class defines the specific method).

Usage

intersectPolyCircle(object, center, radius, ...)

## S3 method for class 'owin'
intersectPolyCircle(object, center, radius, npoly = 32, ...)
## S3 method for class 'SpatialPolygons'
intersectPolyCircle(object, center, radius, npoly = 32, ...)
## S3 method for class 'gpc.poly'
intersectPolyCircle(object, center, radius, npoly = 32,
                   useGEOS = FALSE, ...)

Arguments

object	a polygonal domain of one of the supported classes.
center,radius,npoly	see discpoly.
useGEOS	logical indicating if package rgeos (gIntersection) should be used instead of package gpclib. The latter (default) requires explicit acceptance of gpclib's restricted license via surveillance.options(gpclib=TRUE).
...	potential further arguments (from the generic).

Value

a polygonal domain of the same class as the input object.

Author(s)

Sebastian Meyer

See Also

discpoly to generate a polygonal approximation to a disc

Examples

data("letterR", package="spatstat")
plot(letterR)
plot(intersectPolyCircle(letterR, c(3,2), 1), add=TRUE, col=2, lwd=3)

jimhester/surveillance documentation built on May 19, 2019, 10:33 a.m.