304 lines
8.7 KiB
C++
304 lines
8.7 KiB
C++
// Boost.Geometry (aka GGL, Generic Geometry Library)
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// Copyright (c) 2007-2014 Barend Gehrels, Amsterdam, the Netherlands.
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// Copyright (c) 2008-2014 Bruno Lalande, Paris, France.
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// Copyright (c) 2009-2014 Mateusz Loskot, London, UK.
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// Copyright (c) 2014 Adam Wulkiewicz, Lodz, Poland.
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// This file was modified by Oracle on 2014.
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// Modifications copyright (c) 2014, Oracle and/or its affiliates.
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// Contributed and/or modified by Menelaos Karavelas, on behalf of Oracle
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// Parts of Boost.Geometry are redesigned from Geodan's Geographic Library
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// (geolib/GGL), copyright (c) 1995-2010 Geodan, Amsterdam, the Netherlands.
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// Use, modification and distribution is subject to the Boost Software License,
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// Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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#ifndef BOOST_GEOMETRY_GEOMETRIES_POINT_HPP
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#define BOOST_GEOMETRY_GEOMETRIES_POINT_HPP
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#include <cstddef>
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#include <boost/config.hpp>
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#include <boost/mpl/assert.hpp>
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#include <boost/mpl/int.hpp>
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#include <boost/geometry/core/access.hpp>
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#include <boost/geometry/core/assert.hpp>
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#include <boost/geometry/core/coordinate_type.hpp>
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#include <boost/geometry/core/coordinate_system.hpp>
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#include <boost/geometry/core/coordinate_dimension.hpp>
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#if defined(BOOST_GEOMETRY_ENABLE_ACCESS_DEBUGGING)
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#include <algorithm>
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#include <boost/geometry/core/assert.hpp>
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#endif
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namespace boost { namespace geometry
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{
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// Silence warning C4127: conditional expression is constant
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#if defined(_MSC_VER)
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#pragma warning(push)
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#pragma warning(disable : 4127)
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#endif
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namespace model
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{
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namespace detail
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{
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template <std::size_t DimensionCount, std::size_t Index>
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struct array_assign
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{
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template <typename T>
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static inline void apply(T values[], T const& value)
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{
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values[Index] = value;
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}
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};
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// Specialization avoiding assigning element [2] for only 2 dimensions
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template <> struct array_assign<2, 2>
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{
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template <typename T> static inline void apply(T [], T const& ) {}
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};
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// Specialization avoiding assigning elements for (rarely used) points in 1 dim
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template <> struct array_assign<1, 1>
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{
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template <typename T> static inline void apply(T [], T const& ) {}
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};
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template <> struct array_assign<1, 2>
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{
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template <typename T> static inline void apply(T [], T const& ) {}
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};
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}
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/*!
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\brief Basic point class, having coordinates defined in a neutral way
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\details Defines a neutral point class, fulfilling the Point Concept.
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Library users can use this point class, or use their own point classes.
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This point class is used in most of the samples and tests of Boost.Geometry
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This point class is used occasionally within the library, where a temporary
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point class is necessary.
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\ingroup geometries
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\tparam CoordinateType \tparam_numeric
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\tparam DimensionCount number of coordinates, usually 2 or 3
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\tparam CoordinateSystem coordinate system, for example cs::cartesian
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\qbk{[include reference/geometries/point.qbk]}
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\qbk{before.synopsis, [heading Model of]}
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\qbk{before.synopsis, [link geometry.reference.concepts.concept_point Point Concept]}
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*/
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template
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<
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typename CoordinateType,
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std::size_t DimensionCount,
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typename CoordinateSystem
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>
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class point
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{
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BOOST_MPL_ASSERT_MSG((DimensionCount >= 1),
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DIMENSION_GREATER_THAN_ZERO_EXPECTED,
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(boost::mpl::int_<DimensionCount>));
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// The following enum is used to fully instantiate the
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// CoordinateSystem class and check the correctness of the units
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// passed for non-Cartesian coordinate systems.
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enum { cs_check = sizeof(CoordinateSystem) };
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public:
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#if !defined(BOOST_GEOMETRY_ENABLE_ACCESS_DEBUGGING)
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#if !defined(BOOST_NO_CXX11_DEFAULTED_FUNCTIONS)
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/// \constructor_default_no_init
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point() = default;
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#else
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/// \constructor_default_no_init
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inline point()
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{}
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#endif
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#else // defined(BOOST_GEOMETRY_ENABLE_ACCESS_DEBUGGING)
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point()
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{
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m_created = 1;
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std::fill_n(m_values_initialized, DimensionCount, 0);
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}
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~point()
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{
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m_created = 0;
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std::fill_n(m_values_initialized, DimensionCount, 0);
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}
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#endif
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/// @brief Constructor to set one value
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explicit inline point(CoordinateType const& v0)
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{
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detail::array_assign<DimensionCount, 0>::apply(m_values, v0);
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detail::array_assign<DimensionCount, 1>::apply(m_values, CoordinateType());
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detail::array_assign<DimensionCount, 2>::apply(m_values, CoordinateType());
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#if defined(BOOST_GEOMETRY_ENABLE_ACCESS_DEBUGGING)
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m_created = 1;
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std::fill_n(m_values_initialized, (std::min)(std::size_t(3), DimensionCount), 1);
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#endif
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}
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/// @brief Constructor to set two values
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inline point(CoordinateType const& v0, CoordinateType const& v1)
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{
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detail::array_assign<DimensionCount, 0>::apply(m_values, v0);
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detail::array_assign<DimensionCount, 1>::apply(m_values, v1);
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detail::array_assign<DimensionCount, 2>::apply(m_values, CoordinateType());
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#if defined(BOOST_GEOMETRY_ENABLE_ACCESS_DEBUGGING)
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m_created = 1;
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std::fill_n(m_values_initialized, (std::min)(std::size_t(3), DimensionCount), 1);
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#endif
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}
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/// @brief Constructor to set three values
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inline point(CoordinateType const& v0, CoordinateType const& v1,
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CoordinateType const& v2)
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{
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detail::array_assign<DimensionCount, 0>::apply(m_values, v0);
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detail::array_assign<DimensionCount, 1>::apply(m_values, v1);
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detail::array_assign<DimensionCount, 2>::apply(m_values, v2);
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#if defined(BOOST_GEOMETRY_ENABLE_ACCESS_DEBUGGING)
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m_created = 1;
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std::fill_n(m_values_initialized, (std::min)(std::size_t(3), DimensionCount), 1);
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#endif
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}
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/// @brief Get a coordinate
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/// @tparam K coordinate to get
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/// @return the coordinate
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template <std::size_t K>
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inline CoordinateType const& get() const
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{
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#if defined(BOOST_GEOMETRY_ENABLE_ACCESS_DEBUGGING)
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BOOST_GEOMETRY_ASSERT(m_created == 1);
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BOOST_GEOMETRY_ASSERT(m_values_initialized[K] == 1);
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#endif
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BOOST_STATIC_ASSERT(K < DimensionCount);
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return m_values[K];
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}
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/// @brief Set a coordinate
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/// @tparam K coordinate to set
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/// @param value value to set
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template <std::size_t K>
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inline void set(CoordinateType const& value)
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{
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#if defined(BOOST_GEOMETRY_ENABLE_ACCESS_DEBUGGING)
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BOOST_GEOMETRY_ASSERT(m_created == 1);
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m_values_initialized[K] = 1;
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#endif
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BOOST_STATIC_ASSERT(K < DimensionCount);
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m_values[K] = value;
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}
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private:
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CoordinateType m_values[DimensionCount];
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#if defined(BOOST_GEOMETRY_ENABLE_ACCESS_DEBUGGING)
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int m_created;
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int m_values_initialized[DimensionCount];
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#endif
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};
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} // namespace model
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// Adapt the point to the concept
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#ifndef DOXYGEN_NO_TRAITS_SPECIALIZATIONS
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namespace traits
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{
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template
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<
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typename CoordinateType,
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std::size_t DimensionCount,
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typename CoordinateSystem
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>
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struct tag<model::point<CoordinateType, DimensionCount, CoordinateSystem> >
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{
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typedef point_tag type;
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};
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template
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<
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typename CoordinateType,
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std::size_t DimensionCount,
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typename CoordinateSystem
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>
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struct coordinate_type<model::point<CoordinateType, DimensionCount, CoordinateSystem> >
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{
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typedef CoordinateType type;
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};
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template
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<
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typename CoordinateType,
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std::size_t DimensionCount,
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typename CoordinateSystem
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>
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struct coordinate_system<model::point<CoordinateType, DimensionCount, CoordinateSystem> >
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{
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typedef CoordinateSystem type;
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};
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template
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<
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typename CoordinateType,
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std::size_t DimensionCount,
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typename CoordinateSystem
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>
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struct dimension<model::point<CoordinateType, DimensionCount, CoordinateSystem> >
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: boost::mpl::int_<DimensionCount>
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{};
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template
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<
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typename CoordinateType,
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std::size_t DimensionCount,
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typename CoordinateSystem,
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std::size_t Dimension
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>
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struct access<model::point<CoordinateType, DimensionCount, CoordinateSystem>, Dimension>
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{
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static inline CoordinateType get(
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model::point<CoordinateType, DimensionCount, CoordinateSystem> const& p)
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{
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return p.template get<Dimension>();
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}
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static inline void set(
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model::point<CoordinateType, DimensionCount, CoordinateSystem>& p,
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CoordinateType const& value)
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{
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p.template set<Dimension>(value);
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}
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};
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} // namespace traits
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#endif // DOXYGEN_NO_TRAITS_SPECIALIZATIONS
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#if defined(_MSC_VER)
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#pragma warning(pop)
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#endif
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}} // namespace boost::geometry
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#endif // BOOST_GEOMETRY_GEOMETRIES_POINT_HPP
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