123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127 |
- // Boost.Geometry (aka GGL, Generic Geometry Library)
- // Copyright (c) 2007-2015 Barend Gehrels, Amsterdam, the Netherlands.
- // Copyright (c) 2008-2015 Bruno Lalande, Paris, France.
- // Copyright (c) 2009-2015 Mateusz Loskot, London, UK.
- // This file was modified by Oracle on 2015, 2016, 2018.
- // Modifications copyright (c) 2015-2018, Oracle and/or its affiliates.
- // Contributed and/or modified by Vissarion Fysikopoulos, on behalf of Oracle
- // Contributed and/or modified by Menelaos Karavelas, on behalf of Oracle
- // Contributed and/or modified by Adam Wulkiewicz, on behalf of Oracle
- // Parts of Boost.Geometry are redesigned from Geodan's Geographic Library
- // (geolib/GGL), copyright (c) 1995-2010 Geodan, Amsterdam, the Netherlands.
- // Distributed under the Boost Software License, Version 1.0.
- // (See accompanying file LICENSE_1_0.txt or copy at
- // http://www.boost.org/LICENSE_1_0.txt)
- #ifndef BOOST_GEOMETRY_ALGORITHMS_DETAIL_ENVELOPE_RANGE_HPP
- #define BOOST_GEOMETRY_ALGORITHMS_DETAIL_ENVELOPE_RANGE_HPP
- #include <iterator>
- #include <vector>
- #include <boost/range/begin.hpp>
- #include <boost/range/end.hpp>
- #include <boost/geometry/algorithms/is_empty.hpp>
- #include <boost/geometry/algorithms/detail/envelope/initialize.hpp>
- #include <boost/geometry/algorithms/detail/expand/box.hpp>
- #include <boost/geometry/algorithms/detail/expand/point.hpp>
- #include <boost/geometry/algorithms/detail/expand/segment.hpp>
- #include <boost/geometry/core/coordinate_dimension.hpp>
- namespace boost { namespace geometry
- {
- #ifndef DOXYGEN_NO_DETAIL
- namespace detail { namespace envelope
- {
- // implementation for simple ranges
- struct envelope_range
- {
- template <typename Iterator, typename Box, typename Strategy>
- static inline void apply(Iterator it,
- Iterator last,
- Box& mbr,
- Strategy const& strategy)
- {
- typedef typename std::iterator_traits<Iterator>::value_type value_type;
- // initialize MBR
- initialize<Box, 0, dimension<Box>::value>::apply(mbr);
- if (it != last)
- {
- // initialize box with first element in range
- dispatch::envelope
- <
- value_type
- >::apply(*it, mbr, strategy.get_element_envelope_strategy());
- // consider now the remaining elements in the range (if any)
- for (++it; it != last; ++it)
- {
- dispatch::expand
- <
- Box, value_type
- >::apply(mbr, *it, strategy.get_element_expand_strategy());
- }
- }
- }
- template <typename Range, typename Box, typename Strategy>
- static inline void apply(Range const& range, Box& mbr, Strategy const& strategy)
- {
- return apply(Strategy::begin(range), Strategy::end(range), mbr, strategy);
- }
- };
- // implementation for multi-ranges
- template <typename EnvelopePolicy>
- struct envelope_multi_range
- {
- template <typename MultiRange, typename Box, typename Strategy>
- static inline void apply(MultiRange const& multirange,
- Box& mbr,
- Strategy const& strategy)
- {
- apply(boost::begin(multirange), boost::end(multirange), mbr, strategy);
- }
- template <typename Iter, typename Box, typename Strategy>
- static inline void apply(Iter it,
- Iter last,
- Box& mbr,
- Strategy const& strategy)
- {
- typename Strategy::template multi_state<Box> state;
- for (; it != last; ++it)
- {
- if (! geometry::is_empty(*it))
- {
- Box helper_mbr;
- EnvelopePolicy::apply(*it, helper_mbr, strategy);
- state.apply(helper_mbr);
- }
- }
- state.result(mbr);
- }
- };
- }} // namespace detail::envelope
- #endif // DOXYGEN_NO_DETAIL
- }} // namespace boost::geometry
- #endif // BOOST_GEOMETRY_ALGORITHMS_DETAIL_ENVELOPE_RANGE_HPP
|