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134 lines
4.2 KiB
C++
134 lines
4.2 KiB
C++
// Boost.Geometry (aka GGL, Generic Geometry Library)
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// Copyright (c) 2007-2015 Barend Gehrels, Amsterdam, the Netherlands.
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// Copyright (c) 2008-2015 Bruno Lalande, Paris, France.
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// Copyright (c) 2009-2015 Mateusz Loskot, London, UK.
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// This file was modified by Oracle on 2015-2020.
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// Modifications copyright (c) 2015-2020, Oracle and/or its affiliates.
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// Contributed and/or modified by Vissarion Fysikopoulos, on behalf of Oracle
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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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// 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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// Distributed under the Boost Software License, Version 1.0.
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// (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_ALGORITHMS_DETAIL_ENVELOPE_RANGE_HPP
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#define BOOST_GEOMETRY_ALGORITHMS_DETAIL_ENVELOPE_RANGE_HPP
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#include <iterator>
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#include <vector>
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#include <boost/range/begin.hpp>
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#include <boost/range/end.hpp>
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#include <boost/geometry/algorithms/is_empty.hpp>
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#include <boost/geometry/algorithms/detail/envelope/initialize.hpp>
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#include <boost/geometry/algorithms/detail/expand/box.hpp>
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#include <boost/geometry/algorithms/detail/expand/point.hpp>
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#include <boost/geometry/algorithms/detail/expand/segment.hpp>
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#include <boost/geometry/core/coordinate_dimension.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 envelope
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{
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// implementation for simple ranges
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struct envelope_range
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{
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template <typename Iterator, typename Box, typename Strategy>
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static inline void apply(Iterator it,
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Iterator last,
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Box& mbr,
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Strategy const& strategy)
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{
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typedef typename std::iterator_traits<Iterator>::value_type value_type;
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// initialize MBR
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initialize<Box, 0, dimension<Box>::value>::apply(mbr);
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if (it != last)
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{
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// initialize box with first element in range
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dispatch::envelope
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<
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value_type
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>::apply(*it, mbr, strategy);
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// consider now the remaining elements in the range (if any)
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for (++it; it != last; ++it)
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{
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dispatch::expand
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<
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Box, value_type
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>::apply(mbr, *it, strategy);
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}
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}
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}
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template <typename Range, typename Box, typename Strategy>
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static inline void apply(Range const& range, Box& mbr, Strategy const& strategy)
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{
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using strategy_t = decltype(strategy.envelope(range, mbr));
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return apply(strategy_t::begin(range), strategy_t::end(range),
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mbr, strategy);
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}
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};
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// implementation for multi-ranges
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template <typename EnvelopePolicy>
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struct envelope_multi_range
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{
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template <typename MultiRange, typename Box, typename Strategy>
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static inline void apply(MultiRange const& multirange,
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Box& mbr,
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Strategy const& strategy)
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{
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using range_t = typename boost::range_value<MultiRange>::type;
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using strategy_t = decltype(strategy.envelope(std::declval<range_t>(), mbr));
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using state_t = typename strategy_t::template multi_state<Box>;
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apply<state_t>(boost::begin(multirange), boost::end(multirange), mbr, strategy);
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}
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private:
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template <typename State, typename Iter, typename Box, typename Strategy>
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static inline void apply(Iter it,
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Iter last,
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Box& mbr,
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Strategy const& strategy)
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{
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State state;
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for (; it != last; ++it)
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{
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if (! geometry::is_empty(*it))
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{
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Box helper_mbr;
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EnvelopePolicy::apply(*it, helper_mbr, strategy);
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state.apply(helper_mbr);
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}
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}
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state.result(mbr);
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}
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};
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}} // namespace detail::envelope
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#endif // DOXYGEN_NO_DETAIL
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}} // namespace boost::geometry
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#endif // BOOST_GEOMETRY_ALGORITHMS_DETAIL_ENVELOPE_RANGE_HPP
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