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// Boost.Geometry (aka GGL, Generic Geometry Library)
// Copyright (c) 2007-2012 Barend Gehrels, 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_DETAIL_OVERLAY_COPY_SEGMENT_POINT_HPP
#define BOOST_GEOMETRY_ALGORITHMS_DETAIL_OVERLAY_COPY_SEGMENT_POINT_HPP
#include <boost/array.hpp>
#include <boost/mpl/assert.hpp>
#include <boost/range.hpp>
#include <boost/geometry/core/ring_type.hpp>
#include <boost/geometry/core/exterior_ring.hpp>
#include <boost/geometry/core/interior_rings.hpp>
#include <boost/geometry/algorithms/convert.hpp>
#include <boost/geometry/geometries/concepts/check.hpp>
#include <boost/geometry/views/closeable_view.hpp>
#include <boost/geometry/views/reversible_view.hpp>
namespace boost { namespace geometry
{
#ifndef DOXYGEN_NO_DETAIL
namespace detail { namespace copy_segments
{
template <typename Range, bool Reverse, typename SegmentIdentifier, typename PointOut>
struct copy_segment_point_range
{
typedef typename closeable_view
<
Range const,
closure<Range>::value
>::type cview_type;
typedef typename reversible_view
<
cview_type const,
Reverse ? iterate_reverse : iterate_forward
>::type rview_type;
static inline bool apply(Range const& range,
SegmentIdentifier const& seg_id, bool second,
PointOut& point)
{
int index = seg_id.segment_index;
if (second)
{
index++;
if (index >= boost::size(range))
{
index = 0;
}
}
// Exception?
if (index >= boost::size(range))
{
return false;
}
cview_type cview(range);
rview_type view(cview);
geometry::convert(*(boost::begin(view) + index), point);
return true;
}
};
template <typename Polygon, bool Reverse, typename SegmentIdentifier, typename PointOut>
struct copy_segment_point_polygon
{
static inline bool apply(Polygon const& polygon,
SegmentIdentifier const& seg_id, bool second,
PointOut& point)
{
// Call ring-version with the right ring
return copy_segment_point_range
<
typename geometry::ring_type<Polygon>::type,
Reverse,
SegmentIdentifier,
PointOut
>::apply
(
seg_id.ring_index < 0
? geometry::exterior_ring(polygon)
: geometry::interior_rings(polygon)[seg_id.ring_index],
seg_id, second,
point
);
}
};
template <typename Box, bool Reverse, typename SegmentIdentifier, typename PointOut>
struct copy_segment_point_box
{
static inline bool apply(Box const& box,
SegmentIdentifier const& seg_id, bool second,
PointOut& point)
{
int index = seg_id.segment_index;
if (second)
{
index++;
}
boost::array<typename point_type<Box>::type, 4> bp;
assign_box_corners_oriented<Reverse>(box, bp);
point = bp[index % 4];
return true;
}
};
}} // namespace detail::copy_segments
#endif // DOXYGEN_NO_DETAIL
#ifndef DOXYGEN_NO_DISPATCH
namespace dispatch
{
template
<
typename Tag,
typename GeometryIn,
bool Reverse,
typename SegmentIdentifier,
typename PointOut
>
struct copy_segment_point
{
BOOST_MPL_ASSERT_MSG
(
false, NOT_OR_NOT_YET_IMPLEMENTED_FOR_THIS_GEOMETRY_TYPE
, (types<GeometryIn>)
);
};
template <typename LineString, bool Reverse, typename SegmentIdentifier, typename PointOut>
struct copy_segment_point<linestring_tag, LineString, Reverse, SegmentIdentifier, PointOut>
: detail::copy_segments::copy_segment_point_range
<
LineString, Reverse, SegmentIdentifier, PointOut
>
{};
template <typename Ring, bool Reverse, typename SegmentIdentifier, typename PointOut>
struct copy_segment_point<ring_tag, Ring, Reverse, SegmentIdentifier, PointOut>
: detail::copy_segments::copy_segment_point_range
<
Ring, Reverse, SegmentIdentifier, PointOut
>
{};
template <typename Polygon, bool Reverse, typename SegmentIdentifier, typename PointOut>
struct copy_segment_point<polygon_tag, Polygon, Reverse, SegmentIdentifier, PointOut>
: detail::copy_segments::copy_segment_point_polygon
<
Polygon, Reverse, SegmentIdentifier, PointOut
>
{};
template <typename Box, bool Reverse, typename SegmentIdentifier, typename PointOut>
struct copy_segment_point<box_tag, Box, Reverse, SegmentIdentifier, PointOut>
: detail::copy_segments::copy_segment_point_box
<
Box, Reverse, SegmentIdentifier, PointOut
>
{};
} // namespace dispatch
#endif // DOXYGEN_NO_DISPATCH
/*!
\brief Helper function, copies a point from a segment
\ingroup overlay
*/
template<bool Reverse, typename Geometry, typename SegmentIdentifier, typename PointOut>
inline bool copy_segment_point(Geometry const& geometry,
SegmentIdentifier const& seg_id, bool second,
PointOut& point_out)
{
concept::check<Geometry const>();
return dispatch::copy_segment_point
<
typename tag<Geometry>::type,
Geometry,
Reverse,
SegmentIdentifier,
PointOut
>::apply(geometry, seg_id, second, point_out);
}
/*!
\brief Helper function, to avoid the same construct several times,
copies a point, based on a source-index and two geometries
\ingroup overlay
*/
template
<
bool Reverse1, bool Reverse2,
typename Geometry1, typename Geometry2,
typename SegmentIdentifier,
typename PointOut
>
inline bool copy_segment_point(Geometry1 const& geometry1, Geometry2 const& geometry2,
SegmentIdentifier const& seg_id, bool second,
PointOut& point_out)
{
concept::check<Geometry1 const>();
concept::check<Geometry2 const>();
if (seg_id.source_index == 0)
{
return dispatch::copy_segment_point
<
typename tag<Geometry1>::type,
Geometry1,
Reverse1,
SegmentIdentifier,
PointOut
>::apply(geometry1, seg_id, second, point_out);
}
else if (seg_id.source_index == 1)
{
return dispatch::copy_segment_point
<
typename tag<Geometry2>::type,
Geometry2,
Reverse2,
SegmentIdentifier,
PointOut
>::apply(geometry2, seg_id, second, point_out);
}
// Exception?
return false;
}
/*!
\brief Helper function, to avoid the same construct several times,
copies a point, based on a source-index and two geometries
\ingroup overlay
*/
template
<
bool Reverse1, bool Reverse2,
typename Geometry1, typename Geometry2,
typename SegmentIdentifier,
typename PointOut
>
inline bool copy_segment_points(Geometry1 const& geometry1, Geometry2 const& geometry2,
SegmentIdentifier const& seg_id,
PointOut& point1, PointOut& point2)
{
concept::check<Geometry1 const>();
concept::check<Geometry2 const>();
return copy_segment_point<Reverse1, Reverse2>(geometry1, geometry2, seg_id, false, point1)
&& copy_segment_point<Reverse1, Reverse2>(geometry1, geometry2, seg_id, true, point2);
}
}} // namespace boost::geometry
#endif // BOOST_GEOMETRY_ALGORITHMS_DETAIL_OVERLAY_COPY_SEGMENT_POINT_HPP
|
