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##### Boost.Polygon's polygon_data

Boost.Polygon's polygon type (boost::polygon::polygon_data) is adapted to the Boost.Geometry Ring Concept.

###### Description

Boost.Polygon's points (as well as polygons) can be used by Boost.Geometry. The two libraries can therefore be used together. Using a boost::polygon::polygon_data<...>, algorithms from both Boost.Polygon and Boost.Geometry can be called.

###### Model of

Ring Concept

###### Header

`#include <boost/geometry/geometries/adapted/boost_polygon.hpp>`

The standard header `boost/geometry.hpp` does not include this header.

###### Example

Shows how to use Boost.Polygon polygon_data within Boost.Geometry

    #include <iostream>
    #include <boost/geometry.hpp>
    #include <boost/geometry/geometries/adapted/boost_polygon.hpp>

    int main()
    {
        typedef boost::polygon::polygon_data<int> polygon;
        typedef boost::polygon::polygon_traits<polygon>::point_type point;

        point pts[5] = {
            boost::polygon::construct<point>(0, 0),
            boost::polygon::construct<point>(0, 10),
            boost::polygon::construct<point>(10, 10),
            boost::polygon::construct<point>(10, 0),
            boost::polygon::construct<point>(0, 0)
        };

        polygon poly;
        boost::polygon::set_points(poly, pts, pts+5);

        std::cout << "Area (using Boost.Geometry): "
            << boost::geometry::area(poly) << std::endl;
        std::cout << "Area (using Boost.Polygon): "
            << boost::polygon::area(poly) << std::endl;

        return 0;
    }

Output:

    Area (using Boost.Geometry): 100
    Area (using Boost.Polygon): 100