polyCub (version 0.8.0)

coerce-gpc-methods: Conversion between polygonal "owin" and "gpc.poly"

Description

Package polyCub implements converters between the classes "owin" of package spatstat.geom and "gpc.poly" of package rgeos (originally from gpclib).

Usage

owin2gpc(object)
gpc2owin(object, ...)
as.owin.gpc.poly(W, ...)

Value

The converted polygon of class "gpc.poly" or "owin", respectively. If neither package rgeos nor gpclib are available, owin2gpc will just return the pts slot of the "gpc.poly" (no formal class) with a warning.

Arguments

object

an object of class "gpc.poly" or "owin", respectively.

...

further arguments passed to owin.

W

an object of class "gpc.poly".

Author

Sebastian Meyer

See Also

xylist, and the package rgeos for conversions of "gpc.poly" objects from and to sp's "SpatialPolygons" class.

Examples

if (require("rgeos") && require("spatstat.geom")) {
    ## use example polygons from
    example(plotpolyf, ask = FALSE)

    letterR  # a simple "xylist"
    letterR.owin <- owin(poly = letterR)
    letterR.gpc_from_owin <- owin2gpc(letterR.owin)
    letterR.xylist_from_gpc <- xylist(letterR.gpc_from_owin)
    stopifnot(all.equal(letterR, lapply(letterR.xylist_from_gpc, "[", 1:2)))
    letterR.owin_from_gpc <- as.owin(letterR.gpc_from_owin)
    stopifnot(all.equal(letterR.owin, letterR.owin_from_gpc))
}