// Boost.Geometry (aka GGL, Generic Geometry Library)
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// Copyright (c) 2014-2019, 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_SEGMENT_HPP
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#define BOOST_GEOMETRY_ALGORITHMS_DETAIL_IS_VALID_SEGMENT_HPP
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#include <boost/core/ignore_unused.hpp>
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#include <boost/geometry/core/point_type.hpp>
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#include <boost/geometry/core/tags.hpp>
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#include <boost/geometry/algorithms/assign.hpp>
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#include <boost/geometry/algorithms/validity_failure_type.hpp>
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#include <boost/geometry/algorithms/detail/equals/point_point.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_DISPATCH
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namespace dispatch
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{
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// A segment is a curve.
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// A curve is simple if it does not pass through the same point twice,
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// with the possible exception of its two endpoints
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// A curve is 1-dimensional, hence we have to check is the two
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// endpoints of the segment coincide, since in this case it is
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// 0-dimensional.
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//
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// Reference: OGC 06-103r4 (6.1.6.1)
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template <typename Segment>
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struct is_valid<Segment, segment_tag>
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{
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template <typename VisitPolicy, typename Strategy>
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static inline bool apply(Segment const& segment, VisitPolicy& visitor, Strategy const&)
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{
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typedef typename Strategy::equals_point_point_strategy_type eq_pp_strategy_type;
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boost::ignore_unused(visitor);
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typename point_type<Segment>::type p[2];
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detail::assign_point_from_index<0>(segment, p[0]);
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detail::assign_point_from_index<1>(segment, p[1]);
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if (detail::is_valid::has_invalid_coordinate
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<
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Segment
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>::apply(segment, visitor))
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{
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return false;
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}
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else if (! geometry::detail::equals::equals_point_point(
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p[0], p[1], eq_pp_strategy_type()))
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{
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return visitor.template apply<no_failure>();
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}
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else
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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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}
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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_SEGMENT_HPP
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