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114 lines
2.7 KiB
114 lines
2.7 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_BOX_VIEW_HPP |
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#define BOOST_GEOMETRY_VIEWS_BOX_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 box behave like a ring or a range |
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\details Adapts a box to the Boost.Range concept, enabling the user to iterating |
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box corners. The box_view is registered as a Ring Concept |
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\tparam Box \tparam_geometry{Box} |
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\tparam Clockwise If true, walks in clockwise direction, otherwise |
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it walks in counterclockwise direction |
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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_ring Ring Concept] |
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} |
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\qbk{[include reference/views/box_view.qbk]} |
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*/ |
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template <typename Box, bool Clockwise = true> |
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struct box_view |
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: public detail::points_view |
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< |
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typename geometry::point_type<Box>::type, |
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5 |
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> |
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{ |
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typedef typename geometry::point_type<Box>::type point_type; |
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/// Constructor accepting the box to adapt |
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explicit box_view(Box const& box) |
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: detail::points_view<point_type, 5>(copy_policy(box)) |
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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(Box const& box) |
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: m_box(box) |
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{} |
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inline void apply(point_type* points) const |
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{ |
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detail::assign_box_corners_oriented<!Clockwise>(m_box, points); |
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points[4] = points[0]; |
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} |
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private : |
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Box const& m_box; |
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}; |
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}; |
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#ifndef DOXYGEN_NO_TRAITS_SPECIALIZATIONS |
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// All views on boxes are handled as rings |
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namespace traits |
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{ |
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template<typename Box, bool Clockwise> |
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struct tag<box_view<Box, Clockwise> > |
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{ |
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typedef ring_tag type; |
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}; |
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template<typename Box> |
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struct point_order<box_view<Box, false> > |
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{ |
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static order_selector const value = counterclockwise; |
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}; |
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template<typename Box> |
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struct point_order<box_view<Box, true> > |
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{ |
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static order_selector const value = clockwise; |
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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_BOX_VIEW_HPP
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