Polygon2D -- the class of a polygon in a 2D space

Methods that use an object of class Polygon2D :

• pgfObject(Polygon2D,HashTable) -- create the string describing a circle in pgf
• pictureZone(Polygon2D) -- find the zone that contains the polygon
• svgObject(Polygon2D,HashTable) -- create the string describing a circle in SVG

For the programmer

The object Polygon2D is a type, with ancestor classes GraphicPrimitive < BasicList < Thing.