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src/boost/geometry/io/wkt/write.hpp  view on Meta::CPAN

\brief Stream sequence of points as WKT-part, e.g. (1 2),(3 4)
\note Used in polygon, all multi-geometries
*/
template <typename Range>
struct wkt_sequence
    : wkt_range
        <
            Range,
            opening_parenthesis,
            closing_parenthesis
        >
{};

template <typename Polygon, typename PrefixPolicy>
struct wkt_poly
{
    template <typename Char, typename Traits>
    static inline void apply(std::basic_ostream<Char, Traits>& os,
                Polygon const& poly)
    {
        typedef typename ring_type<Polygon const>::type ring;

        os << PrefixPolicy::apply();
        // TODO: check EMPTY here
        os << "(";
        wkt_sequence<ring>::apply(os, exterior_ring(poly));

        typename interior_return_type<Polygon const>::type rings
                    = interior_rings(poly);
        for (BOOST_AUTO_TPL(it, boost::begin(rings)); it != boost::end(rings); ++it)
        {
            os << ",";
            wkt_sequence<ring>::apply(os, *it);
        }
        os << ")";
    }
};

template <typename Box>
struct wkt_box
{
    typedef typename point_type<Box>::type point_type;

    template <typename Char, typename Traits>
    static inline void apply(std::basic_ostream<Char, Traits>& os,
                Box const& box)
    {
        // Convert to ring, then stream
        typedef model::ring<point_type> ring_type;
        ring_type ring;
        geometry::convert(box, ring);
        os << "POLYGON(";
        wkt_sequence<ring_type>::apply(os, ring);
        os << ")";
    }

    private:

        inline wkt_box()
        {
            // Only streaming of boxes with two dimensions is support, otherwise it is a polyhedron!
            //assert_dimension<B, 2>();
        }
};


template <typename Segment>
struct wkt_segment
{
    typedef typename point_type<Segment>::type point_type;

    template <typename Char, typename Traits>
    static inline void apply(std::basic_ostream<Char, Traits>& os,
                Segment const& segment)
    {
        // Convert to two points, then stream
        typedef boost::array<point_type, 2> sequence;

        sequence points;
        geometry::detail::assign_point_from_index<0>(segment, points[0]);
        geometry::detail::assign_point_from_index<1>(segment, points[1]);

        // In Boost.Geometry a segment is represented
        // in WKT-format like (for 2D): LINESTRING(x y,x y)
        os << "LINESTRING";
        wkt_sequence<sequence>::apply(os, points);
    }

    private:

        inline wkt_segment()
        {}
};

}} // namespace detail::wkt
#endif // DOXYGEN_NO_DETAIL

#ifndef DOXYGEN_NO_DISPATCH
namespace dispatch
{

template <typename Tag, typename Geometry>
struct wkt
{
   BOOST_MPL_ASSERT_MSG
        (
            false, NOT_YET_IMPLEMENTED_FOR_THIS_GEOMETRY_TYPE
            , (types<Geometry>)
        );
};

template <typename Point>
struct wkt<point_tag, Point>
    : detail::wkt::wkt_point
        <
            Point,
            detail::wkt::prefix_point
        >
{};

template <typename Linestring>

src/boost/geometry/io/wkt/write.hpp  view on Meta::CPAN

            Ring,
            detail::wkt::prefix_ring_par_par,
            detail::wkt::double_closing_parenthesis
        >
{};

/*!
\brief Specialization to stream polygon as WKT
*/
template <typename Polygon>
struct wkt<polygon_tag, Polygon>
    : detail::wkt::wkt_poly
        <
            Polygon,
            detail::wkt::prefix_polygon
        >
{};

} // namespace dispatch
#endif // DOXYGEN_NO_DISPATCH

/*!
\brief Generic geometry template manipulator class, takes corresponding output class from traits class
\ingroup wkt
\details Stream manipulator, streams geometry classes as \ref WKT streams
\par Example:
Small example showing how to use the wkt class
\dontinclude doxygen_1.cpp
\skip example_as_wkt_point
\line {
\until }
*/
template <typename Geometry>
class wkt_manipulator
{
public:

    inline wkt_manipulator(Geometry const& g)
        : m_geometry(g)
    {}

    template <typename Char, typename Traits>
    inline friend std::basic_ostream<Char, Traits>& operator<<(
            std::basic_ostream<Char, Traits>& os,
            wkt_manipulator const& m)
    {
        dispatch::wkt
            <
                typename tag<Geometry>::type,
                Geometry
            >::apply(os, m.m_geometry);
        os.flush();
        return os;
    }

private:
    Geometry const& m_geometry;
};

/*!
\brief Main WKT-streaming function
\ingroup wkt
\par Example:
Small example showing how to use the wkt helper function
\dontinclude doxygen_1.cpp
\skip example_as_wkt_vector
\line {
\until }
*/
template <typename Geometry>
inline wkt_manipulator<Geometry> wkt(Geometry const& geometry)
{
    concept::check<Geometry const>();

    return wkt_manipulator<Geometry>(geometry);
}

}} // namespace boost::geometry

#endif // BOOST_GEOMETRY_IO_WKT_WRITE_HPP