boost/geometry/algorithms/append.hpp

// Boost.Geometry (aka GGL, Generic Geometry Library)

// Copyright (c) 2007-2011 Barend Gehrels, Amsterdam, the Netherlands.
// Copyright (c) 2008-2011 Bruno Lalande, Paris, France.
// Copyright (c) 2009-2011 Mateusz Loskot, London, UK.

// Parts of Boost.Geometry are redesigned from Geodan's Geographic Library
// (geolib/GGL), copyright (c) 1995-2010 Geodan, Amsterdam, the Netherlands.

// Use, modification and distribution is subject to the Boost Software License,
// Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)

#ifndef BOOST_GEOMETRY_ALGORITHMS_APPEND_HPP
#define BOOST_GEOMETRY_ALGORITHMS_APPEND_HPP

#include <boost/range.hpp>


#include <boost/geometry/core/access.hpp>
#include <boost/geometry/core/mutable_range.hpp>
#include <boost/geometry/core/point_type.hpp>
#include <boost/geometry/core/tags.hpp>

#include <boost/geometry/algorithms/num_interior_rings.hpp>
#include <boost/geometry/algorithms/detail/convert_point_to_point.hpp>
#include <boost/geometry/geometries/concepts/check.hpp>


namespace boost { namespace geometry
{


#ifndef DOXYGEN_NO_DETAIL
namespace detail { namespace append
{

template <typename Geometry, typename Point>
struct append_no_action
{
    static inline void apply(Geometry& geometry, Point const& point,
                int = 0, int = 0)
    {
    }
};

template <typename Geometry, typename Point>
struct append_point
{
    static inline void apply(Geometry& geometry, Point const& point,
                int = 0, int = 0)
    {
        typename geometry::point_type<Geometry>::type copy;
        geometry::detail::conversion::convert_point_to_point(point, copy);
        traits::push_back<Geometry>::apply(geometry, copy);
    }
};


template <typename Geometry, typename Range>
struct append_range
{
    typedef typename boost::range_value<Range>::type point_type;

    static inline void apply(Geometry& geometry, Range const& range,
                int = 0, int = 0)
    {
        for (typename boost::range_iterator<Range const>::type
            it = boost::begin(range);
             it != boost::end(range);
             ++it)
        {
            append_point<Geometry, point_type>::apply(geometry, *it);
        }
    }
};


template <typename Polygon, typename Point>
struct point_to_polygon
{
    typedef typename ring_type<Polygon>::type ring_type;

    static inline void apply(Polygon& polygon, Point const& point,
                int ring_index, int = 0)
    {
        if (ring_index == -1)
        {
            append_point<ring_type, Point>::apply(
                        exterior_ring(polygon), point);
        }
        else if (ring_index < int(num_interior_rings(polygon)))
        {
            append_point<ring_type, Point>::apply(
                        interior_rings(polygon)[ring_index], point);
        }
    }
};


template <typename Polygon, typename Range>
struct range_to_polygon
{
    typedef typename ring_type<Polygon>::type ring_type;

    static inline void apply(Polygon& polygon, Range const& range,
                int ring_index, int )
    {
        if (ring_index == -1)
        {
            append_range<ring_type, Range>::apply(
                        exterior_ring(polygon), range);
        }
        else if (ring_index < int(num_interior_rings(polygon)))
        {
            append_range<ring_type, Range>::apply(
                        interior_rings(polygon)[ring_index], range);
        }
    }
};


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


#ifndef DOXYGEN_NO_DISPATCH
namespace dispatch
{

namespace splitted_dispatch
{

template <typename Tag, typename Geometry, typename Point>
struct append_point
    : detail::append::append_no_action<Geometry, Point>
{};

template <typename Geometry, typename Point>
struct append_point<linestring_tag, Geometry, Point>
    : detail::append::append_point<Geometry, Point>
{};

template <typename Geometry, typename Point>
struct append_point<ring_tag, Geometry, Point>
    : detail::append::append_point<Geometry, Point>
{};


template <typename Polygon, typename Point>
struct append_point<polygon_tag, Polygon, Point>
        : detail::append::point_to_polygon<Polygon, Point>
{};


template <typename Tag, typename Geometry, typename Range>
struct append_range
    : detail::append::append_no_action<Geometry, Range>
{};

template <typename Geometry, typename Range>
struct append_range<linestring_tag, Geometry, Range>
    : detail::append::append_range<Geometry, Range>
{};

template <typename Geometry, typename Range>
struct append_range<ring_tag, Geometry, Range>
    : detail::append::append_range<Geometry, Range>
{};


template <typename Polygon, typename Range>
struct append_range<polygon_tag, Polygon, Range>
        : detail::append::range_to_polygon<Polygon, Range>
{};

}


// Default: append a range (or linestring or ring or whatever) to any geometry
template <typename TagRangeOrPoint, typename Geometry, typename RangeOrPoint>
struct append
    : splitted_dispatch::append_range<typename tag<Geometry>::type, Geometry, RangeOrPoint>
{};

// Specialization for point to append a point to any geometry
template <typename Geometry, typename RangeOrPoint>
struct append<point_tag, Geometry, RangeOrPoint>
    : splitted_dispatch::append_point<typename tag<Geometry>::type, Geometry, RangeOrPoint>
{};



} // namespace dispatch
#endif // DOXYGEN_NO_DISPATCH


/*!
\brief Appends one or more points to a linestring, ring, polygon, multi-geometry
\ingroup append
\tparam Geometry \tparam_geometry
\tparam RangeOrPoint Either a range or a point, fullfilling Boost.Range concept or Boost.Geometry Point Concept
\param geometry \param_geometry
\param range_or_point The point or range to add
\param ring_index The index of the ring in case of a polygon:
    exterior ring (-1, the default) or  interior ring index
\param multi_index Reserved for multi polygons or multi linestrings

\qbk{[include reference/algorithms/append.qbk]}
}
 */
template <typename Geometry, typename RangeOrPoint>
inline void append(Geometry& geometry, RangeOrPoint const& range_or_point,
            int ring_index = -1, int multi_index = 0)
{
    concept::check<Geometry>();

    dispatch::append
        <
            typename tag<RangeOrPoint>::type,
            Geometry,
            RangeOrPoint
        >::apply(geometry, range_or_point, ring_index, multi_index);
}


}} // namespace boost::geometry


#endif // BOOST_GEOMETRY_ALGORITHMS_APPEND_HPP