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281 lines
7.7 KiB
281 lines
7.7 KiB
// Boost.Geometry (aka GGL, Generic Geometry Library) |
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// Copyright (c) 2008-2011 Bruno Lalande, Paris, France. |
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// Copyright (c) 2008-2011 Barend Gehrels, Amsterdam, the Netherlands. |
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// Copyright (c) 2009-2011 Mateusz Loskot, London, UK. |
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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_ARITHMETIC_ARITHMETIC_HPP |
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#define BOOST_GEOMETRY_ARITHMETIC_ARITHMETIC_HPP |
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#include <functional> |
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#include <boost/call_traits.hpp> |
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#include <boost/concept/requires.hpp> |
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#include <boost/geometry/core/coordinate_type.hpp> |
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#include <boost/geometry/geometries/concepts/point_concept.hpp> |
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#include <boost/geometry/util/for_each_coordinate.hpp> |
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namespace boost { namespace geometry |
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{ |
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#ifndef DOXYGEN_NO_DETAIL |
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namespace detail |
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{ |
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template <typename P> |
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struct param |
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{ |
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typedef typename boost::call_traits |
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< |
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typename coordinate_type<P>::type |
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>::param_type type; |
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}; |
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template <typename C, template <typename> class Function> |
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struct value_operation |
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{ |
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C m_value; |
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inline value_operation(C const &value) |
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: m_value(value) |
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{} |
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template <typename P, int I> |
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inline void apply(P& point) const |
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{ |
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set<I>(point, Function<C>()(get<I>(point), m_value)); |
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} |
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}; |
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template <typename PointSrc, template <typename> class Function> |
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struct point_operation |
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{ |
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typedef typename coordinate_type<PointSrc>::type coordinate_type; |
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PointSrc const& m_source_point; |
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inline point_operation(PointSrc const& point) |
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: m_source_point(point) |
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{} |
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template <typename PointDst, int I> |
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inline void apply(PointDst& dest_point) const |
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{ |
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set<I>(dest_point, |
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Function<coordinate_type>()(get<I>(dest_point), get<I>(m_source_point))); |
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} |
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}; |
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template <typename C> |
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struct value_assignment |
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{ |
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C m_value; |
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inline value_assignment(C const &value) |
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: m_value(value) |
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{} |
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template <typename P, int I> |
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inline void apply(P& point) const |
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{ |
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set<I>(point, m_value); |
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} |
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}; |
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template <typename PointSrc> |
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struct point_assignment |
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{ |
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PointSrc const& m_source_point; |
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inline point_assignment(PointSrc const& point) |
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: m_source_point(point) |
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{} |
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template <typename PointDst, int I> |
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inline void apply(PointDst& dest_point) const |
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{ |
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set<I>(dest_point, get<I>(m_source_point)); |
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} |
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}; |
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} // namespace detail |
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#endif // DOXYGEN_NO_DETAIL |
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/*! |
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\brief Adds the same value to each coordinate of a point |
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\ingroup arithmetic |
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\details |
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\param p point |
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\param value value to add |
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*/ |
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template <typename Point> |
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inline void add_value(Point& p, typename detail::param<Point>::type value) |
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{ |
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BOOST_CONCEPT_ASSERT( (concept::Point<Point>) ); |
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for_each_coordinate(p, detail::value_operation<typename coordinate_type<Point>::type, std::plus>(value)); |
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} |
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/*! |
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\brief Adds a point to another |
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\ingroup arithmetic |
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\details The coordinates of the second point will be added to those of the first point. |
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The second point is not modified. |
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\param p1 first point |
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\param p2 second point |
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*/ |
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template <typename Point1, typename Point2> |
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inline void add_point(Point1& p1, Point2 const& p2) |
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{ |
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BOOST_CONCEPT_ASSERT( (concept::Point<Point2>) ); |
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BOOST_CONCEPT_ASSERT( (concept::ConstPoint<Point2>) ); |
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for_each_coordinate(p1, detail::point_operation<Point2, std::plus>(p2)); |
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} |
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/*! |
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\brief Subtracts the same value to each coordinate of a point |
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\ingroup arithmetic |
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\details |
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\param p point |
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\param value value to subtract |
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*/ |
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template <typename Point> |
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inline void subtract_value(Point& p, typename detail::param<Point>::type value) |
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{ |
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BOOST_CONCEPT_ASSERT( (concept::Point<Point>) ); |
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for_each_coordinate(p, detail::value_operation<typename coordinate_type<Point>::type, std::minus>(value)); |
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} |
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/*! |
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\brief Subtracts a point to another |
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\ingroup arithmetic |
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\details The coordinates of the second point will be subtracted to those of the first point. |
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The second point is not modified. |
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\param p1 first point |
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\param p2 second point |
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*/ |
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template <typename Point1, typename Point2> |
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inline void subtract_point(Point1& p1, Point2 const& p2) |
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{ |
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BOOST_CONCEPT_ASSERT( (concept::Point<Point2>) ); |
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BOOST_CONCEPT_ASSERT( (concept::ConstPoint<Point2>) ); |
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for_each_coordinate(p1, detail::point_operation<Point2, std::minus>(p2)); |
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} |
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/*! |
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\brief Multiplies each coordinate of a point by the same value |
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\ingroup arithmetic |
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\details |
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\param p point |
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\param value value to multiply by |
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*/ |
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template <typename Point> |
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inline void multiply_value(Point& p, typename detail::param<Point>::type value) |
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{ |
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BOOST_CONCEPT_ASSERT( (concept::Point<Point>) ); |
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for_each_coordinate(p, detail::value_operation<typename coordinate_type<Point>::type, std::multiplies>(value)); |
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} |
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/*! |
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\brief Multiplies a point by another |
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\ingroup arithmetic |
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\details The coordinates of the first point will be multiplied by those of the second point. |
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The second point is not modified. |
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\param p1 first point |
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\param p2 second point |
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\note This is *not* a dot, cross or wedge product. It is a mere field-by-field multiplication. |
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*/ |
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template <typename Point1, typename Point2> |
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inline void multiply_point(Point1& p1, Point2 const& p2) |
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{ |
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BOOST_CONCEPT_ASSERT( (concept::Point<Point2>) ); |
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BOOST_CONCEPT_ASSERT( (concept::ConstPoint<Point2>) ); |
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for_each_coordinate(p1, detail::point_operation<Point2, std::multiplies>(p2)); |
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} |
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/*! |
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\brief Divides each coordinate of the same point by a value |
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\ingroup arithmetic |
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\details |
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\param p point |
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\param value value to divide by |
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*/ |
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template <typename Point> |
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inline void divide_value(Point& p, typename detail::param<Point>::type value) |
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{ |
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BOOST_CONCEPT_ASSERT( (concept::Point<Point>) ); |
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for_each_coordinate(p, detail::value_operation<typename coordinate_type<Point>::type, std::divides>(value)); |
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} |
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/*! |
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\brief Divides a point by another |
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\ingroup arithmetic |
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\details The coordinates of the first point will be divided by those of the second point. |
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The second point is not modified. |
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\param p1 first point |
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\param p2 second point |
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*/ |
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template <typename Point1, typename Point2> |
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inline void divide_point(Point1& p1, Point2 const& p2) |
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{ |
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BOOST_CONCEPT_ASSERT( (concept::Point<Point2>) ); |
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BOOST_CONCEPT_ASSERT( (concept::ConstPoint<Point2>) ); |
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for_each_coordinate(p1, detail::point_operation<Point2, std::divides>(p2)); |
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} |
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/*! |
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\brief Assign each coordinate of a point the same value |
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\ingroup arithmetic |
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\details |
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\param p point |
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\param value value to assign |
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*/ |
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template <typename Point> |
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inline void assign_value(Point& p, typename detail::param<Point>::type value) |
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{ |
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BOOST_CONCEPT_ASSERT( (concept::Point<Point>) ); |
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for_each_coordinate(p, detail::value_assignment<typename coordinate_type<Point>::type>(value)); |
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} |
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/*! |
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\brief Assign a point with another |
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\ingroup arithmetic |
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\details The coordinates of the first point will be assigned those of the second point. |
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The second point is not modified. |
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\param p1 first point |
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\param p2 second point |
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*/ |
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template <typename Point1, typename Point2> |
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inline void assign_point(Point1& p1, const Point2& p2) |
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{ |
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BOOST_CONCEPT_ASSERT( (concept::Point<Point2>) ); |
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BOOST_CONCEPT_ASSERT( (concept::ConstPoint<Point2>) ); |
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for_each_coordinate(p1, detail::point_assignment<Point2>(p2)); |
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} |
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}} // namespace boost::geometry |
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#endif // BOOST_GEOMETRY_ARITHMETIC_ARITHMETIC_HPP
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