RSurvey (version 0.5.0)

polyManage: Manage Polygons

Description

A GUI for managing and manipulating polygons that is based on the gpclib package.

Usage

polyManage(parent, ply = NULL, ply.ran = NULL, ply.lim = NULL, 
encoding = getOption("encoding"))

Arguments

parent

tkwin; the parent window (optional)

ply

list; its components are objects of class gpc.poly-class

ply.ran

character; the name of the ply component that specifies the range polygon (optional)

ply.lim

character; the name of the ply component that specifies the limit polygon (optional)

encoding

character; encoding to be assumed for input strings. If the value is "latin1" or "UTF-8" it is used to mark character strings as known to be in Latin-1 or UTF-8: it is not used to re-encode the input.

Value

• Returns a list with components ply, ply.ran, and ply.lim, see Arguments section.

Details

The text file representation of a polygon is of the following format: x1 y1 x2 y2 ... x1 y1 x2 y2 ... The hole flag is either 1 to indicate a hole, or 0 for a regular contour. See read.polyfile within the gpclib package for details.

See Also

polyfile, union, setdiff, intersect

Examples

polyManage()