// Boost.Geometry (aka GGL, Generic Geometry Library)
|
|
// Copyright (c) 2015-2020, Oracle and/or its affiliates.
|
|
// Contributed and/or modified by Menelaos Karavelas, on behalf of Oracle
|
// Contributed and/or modified by Adam Wulkiewicz, on behalf of Oracle
|
|
// Licensed under the Boost Software License version 1.0.
|
// http://www.boost.org/users/license.html
|
|
#ifndef BOOST_GEOMETRY_VIEWS_DETAIL_TWO_DIMENSIONAL_VIEW_HPP
|
#define BOOST_GEOMETRY_VIEWS_DETAIL_TWO_DIMENSIONAL_VIEW_HPP
|
|
#include <cstddef>
|
|
#include <boost/geometry/core/access.hpp>
|
#include <boost/geometry/core/coordinate_type.hpp>
|
#include <boost/geometry/core/coordinate_system.hpp>
|
#include <boost/geometry/core/coordinate_dimension.hpp>
|
#include <boost/geometry/core/point_type.hpp>
|
#include <boost/geometry/core/static_assert.hpp>
|
#include <boost/geometry/core/tag.hpp>
|
#include <boost/geometry/core/tags.hpp>
|
|
#include <boost/geometry/algorithms/not_implemented.hpp>
|
|
|
namespace boost { namespace geometry
|
{
|
|
#ifndef DOXYGEN_NO_DETAIL
|
namespace detail
|
{
|
|
template
|
<
|
typename Geometry,
|
std::size_t Dimension1 = 0,
|
std::size_t Dimension2 = 1,
|
typename Tag = typename tag<Geometry>::type
|
>
|
struct two_dimensional_view
|
: not_implemented<Tag>
|
{};
|
|
|
// View that enables to choose two dimensions of a point and see it as
|
// a two-dimensional point
|
template <typename Point, std::size_t Dimension1, std::size_t Dimension2>
|
struct two_dimensional_view<Point, Dimension1, Dimension2, point_tag>
|
{
|
BOOST_GEOMETRY_STATIC_ASSERT(
|
(Dimension1 < dimension<Point>::value),
|
"Coordinate Dimension1 is larger than Point's dimension.",
|
std::integral_constant<std::size_t, Dimension1>);
|
|
BOOST_GEOMETRY_STATIC_ASSERT(
|
(Dimension2 < dimension<Point>::value),
|
"Coordinate Dimension2 is larger than Point's dimension.",
|
std::integral_constant<std::size_t, Dimension2>);
|
|
two_dimensional_view(Point& point)
|
: m_point(point)
|
{}
|
|
Point& m_point;
|
};
|
|
|
} // namespace detail
|
#endif // DOXYGEN_NO_DETAIL
|
|
|
#ifndef DOXYGEN_NO_TRAITS_SPECIALIZATIONS
|
namespace traits
|
{
|
|
|
template <typename Point, std::size_t Dimension1, std::size_t Dimension2>
|
struct tag
|
<
|
geometry::detail::two_dimensional_view
|
<
|
Point, Dimension1, Dimension2, point_tag
|
>
|
>
|
{
|
typedef point_tag type;
|
};
|
|
template <typename Point, std::size_t Dimension1, std::size_t Dimension2>
|
struct coordinate_system
|
<
|
geometry::detail::two_dimensional_view
|
<
|
Point, Dimension1, Dimension2, point_tag
|
>
|
> : coordinate_system<typename geometry::point_type<Point>::type>
|
{};
|
|
template <typename Point, std::size_t Dimension1, std::size_t Dimension2>
|
struct coordinate_type
|
<
|
geometry::detail::two_dimensional_view
|
<
|
Point, Dimension1, Dimension2, point_tag
|
>
|
> : coordinate_type<typename geometry::point_type<Point>::type>
|
{};
|
|
template <typename Point, std::size_t Dimension1, std::size_t Dimension2>
|
struct dimension
|
<
|
geometry::detail::two_dimensional_view
|
<
|
Point, Dimension1, Dimension2, point_tag
|
>
|
> : std::integral_constant<std::size_t, 2>
|
{};
|
|
template <typename Point, std::size_t Dimension1, std::size_t Dimension2>
|
struct point_type
|
<
|
geometry::detail::two_dimensional_view
|
<
|
Point, Dimension1, Dimension2, point_tag
|
>
|
>
|
{
|
typedef typename geometry::point_type<Point>::type type;
|
};
|
|
|
template <typename Point, std::size_t Dimension1, std::size_t Dimension2>
|
struct access
|
<
|
geometry::detail::two_dimensional_view
|
<
|
Point, Dimension1, Dimension2, point_tag
|
>,
|
0
|
>
|
{
|
typedef typename geometry::coordinate_type<Point>::type coordinate_type;
|
typedef geometry::detail::two_dimensional_view
|
<
|
Point, Dimension1, Dimension2, point_tag
|
> view_type;
|
|
static inline coordinate_type get(view_type const& view)
|
{
|
return geometry::get<Dimension1>(view.m_point);
|
}
|
|
static inline void set(view_type& view, coordinate_type const& value)
|
{
|
geometry::set<Dimension1>(view.m_point, value);
|
}
|
};
|
|
template <typename Point, std::size_t Dimension1, std::size_t Dimension2>
|
struct access
|
<
|
geometry::detail::two_dimensional_view
|
<
|
Point, Dimension1, Dimension2, point_tag
|
>,
|
1
|
>
|
{
|
typedef typename geometry::coordinate_type<Point>::type coordinate_type;
|
typedef geometry::detail::two_dimensional_view
|
<
|
Point, Dimension1, Dimension2, point_tag
|
> view_type;
|
|
static inline coordinate_type get(view_type const& view)
|
{
|
return geometry::get<Dimension2>(view.m_point);
|
}
|
|
static inline void set(view_type& view, coordinate_type const& value)
|
{
|
geometry::set<Dimension2>(view.m_point, value);
|
}
|
};
|
|
|
} // namespace traits
|
#endif // DOXYGEN_NO_TRAITS_SPECIALIZATIONS
|
|
}} // namespace boost::geometry
|
|
|
#endif // BOOST_GEOMETRY_VIEWS_DETAIL_TWO_DIMENSIONAL_VIEW_HPP
|
