// Boost.Geometry (aka GGL, Generic Geometry Library)
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// Copyright (c) 2014-2015, Oracle and/or its affiliates.
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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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// Contributed and/or modified by Menelaos Karavelas, on behalf of Oracle
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#ifndef BOOST_GEOMETRY_ALGORITHMS_DETAIL_TURNS_COMPARE_TURNS_HPP
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#define BOOST_GEOMETRY_ALGORITHMS_DETAIL_TURNS_COMPARE_TURNS_HPP
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#include <cstddef>
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#include <functional>
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#include <boost/geometry/util/math.hpp>
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#include <boost/geometry/algorithms/detail/overlay/turn_info.hpp>
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namespace boost { namespace geometry
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{
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namespace detail { namespace turns
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{
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// TURNS SORTING AND SEARCHING
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// sort turns by G1 - source_index == 0 by:
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// seg_id -> fraction -> other_id -> operation
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template
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<
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typename IdLess = std::less<signed_size_type>,
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int N = 0, int U = 1, int I = 2, int B = 3, int C = 4, int O = 0,
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std::size_t OpId = 0
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>
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struct less_seg_fraction_other_op
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{
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BOOST_STATIC_ASSERT(OpId < 2);
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static const std::size_t other_op_id = (OpId + 1) % 2;
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template <typename Op>
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static inline int order_op(Op const& op)
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{
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switch (op.operation)
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{
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case detail::overlay::operation_none : return N;
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case detail::overlay::operation_union : return U;
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case detail::overlay::operation_intersection : return I;
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case detail::overlay::operation_blocked : return B;
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case detail::overlay::operation_continue : return C;
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case detail::overlay::operation_opposite : return O;
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}
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return -1;
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}
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template <typename Op>
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static inline bool use_operation(Op const& left, Op const& right)
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{
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return order_op(left) < order_op(right);
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}
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template <typename Turn>
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static inline bool use_other_id(Turn const& left, Turn const& right)
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{
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segment_identifier const& left_other_seg_id = left.operations[other_op_id].seg_id;
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segment_identifier const& right_other_seg_id = right.operations[other_op_id].seg_id;
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if ( left_other_seg_id.multi_index != right_other_seg_id.multi_index )
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{
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return left_other_seg_id.multi_index < right_other_seg_id.multi_index;
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}
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if ( left_other_seg_id.ring_index != right_other_seg_id.ring_index )
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{
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return left_other_seg_id.ring_index != right_other_seg_id.ring_index;
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}
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if ( left_other_seg_id.segment_index != right_other_seg_id.segment_index )
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{
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return IdLess()(left_other_seg_id.segment_index,
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right_other_seg_id.segment_index);
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}
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return use_operation(left.operations[OpId], right.operations[OpId]);
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}
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template <typename Turn>
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static inline bool use_fraction(Turn const& left, Turn const& right)
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{
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return
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geometry::math::equals(left.operations[OpId].fraction,
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right.operations[OpId].fraction)
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?
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use_other_id(left, right)
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:
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(left.operations[OpId].fraction < right.operations[OpId].fraction)
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;
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}
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template <typename Turn>
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inline bool operator()(Turn const& left, Turn const& right) const
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{
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segment_identifier const& sl = left.operations[OpId].seg_id;
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segment_identifier const& sr = right.operations[OpId].seg_id;
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return sl < sr || ( sl == sr && use_fraction(left, right) );
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}
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};
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}} // namespace detail::turns
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}} // namespace boost::geometry
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#endif // BOOST_GEOMETRY_ALGORITHMS_DETAIL_TURNS_COMPARE_TURNS_HPP
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