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100 lines
2.5 KiB
100 lines
2.5 KiB
// Boost.Geometry (aka GGL, Generic Geometry Library) |
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// Copyright (c) 2007-2011 Barend Gehrels, Amsterdam, the Netherlands. |
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// Copyright (c) 2008-2011 Bruno Lalande, Paris, France. |
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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_VIEWS_SEGMENT_VIEW_HPP |
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#define BOOST_GEOMETRY_VIEWS_SEGMENT_VIEW_HPP |
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#include <boost/range.hpp> |
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#include <boost/geometry/core/point_type.hpp> |
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#include <boost/geometry/views/detail/points_view.hpp> |
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#include <boost/geometry/algorithms/assign.hpp> |
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namespace boost { namespace geometry |
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{ |
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/*! |
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\brief Makes a segment behave like a linestring or a range |
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\details Adapts a segment to the Boost.Range concept, enabling the user to |
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iterate the two segment points. The segment_view is registered as a LineString Concept |
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\tparam Segment \tparam_geometry{Segment} |
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\ingroup views |
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\qbk{before.synopsis, |
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[heading Model of] |
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[link geometry.reference.concepts.concept_linestring LineString Concept] |
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} |
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\qbk{[include reference/views/segment_view.qbk]} |
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*/ |
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template <typename Segment> |
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struct segment_view |
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: public detail::points_view |
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< |
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typename geometry::point_type<Segment>::type, |
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2 |
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> |
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{ |
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typedef typename geometry::point_type<Segment>::type point_type; |
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/// Constructor accepting the segment to adapt |
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explicit segment_view(Segment const& segment) |
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: detail::points_view<point_type, 2>(copy_policy(segment)) |
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{} |
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private : |
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class copy_policy |
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{ |
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public : |
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inline copy_policy(Segment const& segment) |
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: m_segment(segment) |
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{} |
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inline void apply(point_type* points) const |
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{ |
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geometry::detail::assign_point_from_index<0>(m_segment, points[0]); |
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geometry::detail::assign_point_from_index<1>(m_segment, points[1]); |
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} |
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private : |
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Segment const& m_segment; |
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}; |
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}; |
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#ifndef DOXYGEN_NO_TRAITS_SPECIALIZATIONS |
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// All segment ranges can be handled as linestrings |
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namespace traits |
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{ |
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template<typename Segment> |
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struct tag<segment_view<Segment> > |
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{ |
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typedef linestring_tag type; |
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}; |
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} |
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#endif // DOXYGEN_NO_TRAITS_SPECIALIZATIONS |
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}} // namespace boost::geometry |
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#endif // BOOST_GEOMETRY_VIEWS_SEGMENT_VIEW_HPP
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