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#### convert

Converts one geometry to another geometry.

###### Description

The convert algorithm converts one geometry, e.g. a BOX, to another geometry, e.g. a RING. This only if it is possible and applicable.

###### Synopsis

    template<typename Geometry1, typename Geometry2>
    void convert(Geometry1 const & geometry1, Geometry2 & geometry2)

###### Parameters

Type | Concept | Name | Description
--- | --- | --- | ---
Geometry1 const & | Any type fulfilling a Geometry Concept | geometry1 | A model of the specified concept (source)
Geometry2 & | Any type fulfilling a Geometry Concept | geometry2 | A model of the specified concept (target)

###### Header

`#include <boost/geometry/algorithms/convert.hpp>`

| Tip
convert is not defined within OGC or ISO

| Tip
convert is modelled as source -> target (where assign is modelled as target := source)

###### Complexity

Linear

###### Example

Shows how to convert a geometry into another geometry

    #include <iostream>

    #include <boost/geometry.hpp>
    #include <boost/geometry/geometries/box.hpp>
    #include <boost/geometry/geometries/point_xy.hpp>
    #include <boost/geometry/geometries/polygon.hpp>
    #include <boost/geometry/geometries/adapted/boost_tuple.hpp>

    BOOST_GEOMETRY_REGISTER_BOOST_TUPLE_CS(cs::cartesian)

    int main()
    {
        typedef boost::geometry::model::d2::point_xy<double> point;
        typedef boost::geometry::model::box<point> box;
        typedef boost::geometry::model::polygon<point> polygon;

        point p1(1, 1);
        box bx = boost::geometry::make<box>(1, 1, 2, 2);

        // Assign a box to a polygon (conversion box->poly)
        polygon poly;
        boost::geometry::convert(bx, poly);

        // Convert a point to another point type (conversion of point-type)
        boost::tuple<double, double> p2;
        boost::geometry::convert(p1, p2); // source -> target

        using boost::geometry::dsv;
        std::cout
            << "box: " << dsv(bx) << std::endl
            << "polygon: " << dsv(poly) << std::endl
            << "point: " << dsv(p1) << std::endl
            << "point tuples: " << dsv(p2) << std::endl
            ;

        return 0;
    }

Output:

    box: ((1, 1), (2, 2))
    polygon: (((1, 1), (1, 2), (2, 2), (2, 1), (1, 1)))
    point: (1, 1)
    point tuples: (1, 1)

###### See also

- assign