A General Polygon Clipper Library
=================================

A flexible and highly robust polygon set operations library for use with C
applications, as referenced in the comp.graphics.algorithms FAQ and the
UIUC Computational Geometry Pages.

Features:

    * Difference, intersection, exclusive-or and union clip operations are
      supported.
    * Polygons may be comprised of multiple disjoint contours.
    * Contour vertices may be given in any order - clockwise or
      anticlockwise. 
    * Contours may be convex, concave or self-intersecting.
    * Contours may be nested (i.e. polygons may have holes).
    * Output may take the form of either polygon contours or tristrips.
    * Hole and external contours are differentiated in the result.
    * Coincident edges and degenerate regions are handled correctly.

Autoconf/Automake/Libtool support has been added to the present version.

For more information see:

    http://www.cs.man.ac.uk/~amurta/software/index.html#gpc

