116 lines
3.0 KiB
C++
116 lines
3.0 KiB
C++
// Boost.Geometry (aka GGL, Generic Geometry Library)
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// Copyright (c) 2014-2017, Oracle and/or its affiliates.
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// Contributed and/or modified by Menelaos Karavelas, on behalf of Oracle
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// Contributed and/or modified by Adam Wulkiewicz, on behalf of Oracle
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// Licensed under the Boost Software License version 1.0.
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// http://www.boost.org/users/license.html
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#ifndef BOOST_GEOMETRY_ALGORITHMS_DETAIL_IS_VALID_BOX_HPP
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#define BOOST_GEOMETRY_ALGORITHMS_DETAIL_IS_VALID_BOX_HPP
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#include <cstddef>
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#include <boost/core/ignore_unused.hpp>
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#include <boost/geometry/core/access.hpp>
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#include <boost/geometry/core/tags.hpp>
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#include <boost/geometry/core/coordinate_dimension.hpp>
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#include <boost/geometry/algorithms/validity_failure_type.hpp>
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#include <boost/geometry/algorithms/detail/is_valid/has_invalid_coordinate.hpp>
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#include <boost/geometry/algorithms/dispatch/is_valid.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 { namespace is_valid
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{
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template <typename Box, std::size_t I>
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struct has_valid_corners
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{
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template <typename VisitPolicy>
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static inline bool apply(Box const& box, VisitPolicy& visitor)
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{
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if (math::equals(geometry::get<geometry::min_corner, I-1>(box),
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geometry::get<geometry::max_corner, I-1>(box)))
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{
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return
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visitor.template apply<failure_wrong_topological_dimension>();
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}
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else if (geometry::get<geometry::min_corner, I-1>(box)
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>
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geometry::get<geometry::max_corner, I-1>(box))
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{
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return visitor.template apply<failure_wrong_corner_order>();
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}
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return has_valid_corners<Box, I-1>::apply(box, visitor);
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}
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};
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template <typename Box>
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struct has_valid_corners<Box, 0>
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{
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template <typename VisitPolicy>
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static inline bool apply(Box const&, VisitPolicy& visitor)
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{
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boost::ignore_unused(visitor);
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return visitor.template apply<no_failure>();
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}
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};
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template <typename Box>
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struct is_valid_box
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{
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template <typename VisitPolicy, typename Strategy>
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static inline bool apply(Box const& box, VisitPolicy& visitor, Strategy const&)
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{
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return
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! has_invalid_coordinate<Box>::apply(box, visitor)
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&&
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has_valid_corners<Box, dimension<Box>::value>::apply(box, visitor);
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}
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};
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}} // namespace detail::is_valid
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#endif // DOXYGEN_NO_DETAIL
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#ifndef DOXYGEN_NO_DISPATCH
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namespace dispatch
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{
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// A box is always simple
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// A box is a Polygon, and it satisfies the conditions for Polygon validity.
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//
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// The only thing we have to check is whether the max corner lies in
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// the upper-right quadrant as defined by the min corner
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//
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// Reference (for polygon validity): OGC 06-103r4 (6.1.11.1)
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template <typename Box>
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struct is_valid<Box, box_tag>
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: detail::is_valid::is_valid_box<Box>
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{};
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} // namespace dispatch
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#endif // DOXYGEN_NO_DISPATCH
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}} // namespace boost::geometry
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#endif // BOOST_GEOMETRY_ALGORITHMS_DETAIL_IS_VALID_BOX_HPP
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