[R] New package: gpclib

[Roger Peng]

I have just uploaded a package to CRAN called `gpclib' for clipping large
and complex polygons.  This package provides an R interface to Alan
Murta's very fast General Polygon Clipper library (written in C), which
has an optimized version of the Vatti algorithm. Not all features of
Murta's library are implemented -- right now you can do intersections,
differences, and unions.  There are also functions for reading/writing
from/to files and coercing between various data types.

For some more details about the package see
http://department.stat.ucla.edu/~rpeng/R/gpclib.

Please send any comments, complaints, and bug reports to
rpeng at stat.ucla.edu.

Here is the DESCRIPTION file for the package:

Package:  gpclib
Version:  1.0
Date:  1/6/2003
Depends:  R (>= 1.6.1)
Title:  General Polygon Clipping Library for R
Author:  R interface by Roger D. Peng <rpeng at stat.ucla.edu>; GPC library
	 by Alan Murta
Maintainer:  Roger D. Peng <rpeng at stat.ucla.edu>
Description:  General polygon clipping routines for R based on Alan
	      Murta's C library
License:  Code written by R. D. Peng is available under the LGPL; the C
	  code for the GPC library is free for non-commercial use (see the
	  files `gpc.c' and `gpc.h' for details)
URL:  http://department.stat.ucla.edu/~rpeng/R/gpclib;
      http://www.cs.man.ac.uk/aig/staff/alan/software

Happy clipping!

-roger
_______________________________
UCLA Department of Statistics
rpeng at stat.ucla.edu
http://www.stat.ucla.edu/~rpeng