Boost C++ Libraries

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BOOST_GEOMETRY_REGISTER_MULTI_POLYGON

Macro to register a multi_polygon.

Description

The macro BOOST_GEOMETRY_REGISTER_MULTI_POLYGON registers a multi_polygon such that it is recognized by Boost.Geometry and that Boost.Geometry functionality can used with the specified type. The multi_polygon may contain template parameters, which must be specified then.

Synopsis

#define BOOST_GEOMETRY_REGISTER_MULTI_POLYGON(MultiPolygon)

Parameters

Name	Description
MultiPolygon	multi_polygon type to be registered

Header

#include <boost/geometry/geometries/register/multi_polygon.hpp>

Example

Show the use of the macro BOOST_GEOMETRY_REGISTER_MULTI_POLYGON

#include <iostream>

#include <boost/geometry.hpp>
#include <boost/geometry/geometries/polygon.hpp>
#include <boost/geometry/geometries/adapted/boost_tuple.hpp>
#include <boost/geometry/geometries/register/multi_polygon.hpp>

typedef boost::geometry::model::polygon
    <
        boost::tuple<float, float>
    > polygon_type;

BOOST_GEOMETRY_REGISTER_BOOST_TUPLE_CS(cs::cartesian)
BOOST_GEOMETRY_REGISTER_MULTI_POLYGON(std::vector<polygon_type>)

int main()
{
    // Normal usage of std::
    std::vector<polygon_type> polygons(2);
    boost::geometry::read_wkt("POLYGON((0 0,0 1,1 1,1 0,0 0))", polygons[0]);
    boost::geometry::read_wkt("POLYGON((3 0,3 1,4 1,4 0,3 0))", polygons[1]);

    // Usage of Boost.Geometry
    std::cout << "AREA: "  << boost::geometry::area(polygons) << std::endl;

    return 0;
}

Output:

AREA: 2