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Diffstat (limited to 'boost/geometry/algorithms/detail/disjoint/segment_box.hpp')
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1 files changed, 291 insertions, 0 deletions
diff --git a/boost/geometry/algorithms/detail/disjoint/segment_box.hpp b/boost/geometry/algorithms/detail/disjoint/segment_box.hpp new file mode 100644 index 0000000000..5368432ed4 --- /dev/null +++ b/boost/geometry/algorithms/detail/disjoint/segment_box.hpp @@ -0,0 +1,291 @@ +// Boost.Geometry (aka GGL, Generic Geometry Library) + +// Copyright (c) 2007-2014 Barend Gehrels, Amsterdam, the Netherlands. +// Copyright (c) 2008-2014 Bruno Lalande, Paris, France. +// Copyright (c) 2009-2014 Mateusz Loskot, London, UK. +// Copyright (c) 2013-2014 Adam Wulkiewicz, Lodz, Poland. + +// This file was modified by Oracle on 2013-2014. +// Modifications copyright (c) 2013-2014, Oracle and/or its affiliates. + +// Contributed and/or modified by Adam Wulkiewicz, on behalf of Oracle +// Contributed and/or modified by Menelaos Karavelas, 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. + +// Use, modification and distribution is subject to 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_DISJOINT_SEGMENT_BOX_HPP +#define BOOST_GEOMETRY_ALGORITHMS_DETAIL_DISJOINT_SEGMENT_BOX_HPP + +#include <cstddef> +#include <utility> + +#include <boost/numeric/conversion/cast.hpp> + +#include <boost/geometry/util/math.hpp> +#include <boost/geometry/util/calculation_type.hpp> + +#include <boost/geometry/core/access.hpp> +#include <boost/geometry/core/tags.hpp> +#include <boost/geometry/core/coordinate_dimension.hpp> +#include <boost/geometry/core/point_type.hpp> + +#include <boost/geometry/algorithms/detail/assign_indexed_point.hpp> + +#include <boost/geometry/algorithms/dispatch/disjoint.hpp> + + +namespace boost { namespace geometry +{ + + +#ifndef DOXYGEN_NO_DETAIL +namespace detail { namespace disjoint +{ + + +template <std::size_t I> +struct compute_tmin_tmax_per_dim +{ + template <typename SegmentPoint, typename Box, typename RelativeDistance> + static inline void apply(SegmentPoint const& p0, + SegmentPoint const& p1, + Box const& box, + RelativeDistance& ti_min, + RelativeDistance& ti_max, + RelativeDistance& diff) + { + typedef typename coordinate_type<Box>::type box_coordinate_type; + typedef typename coordinate_type + < + SegmentPoint + >::type point_coordinate_type; + + RelativeDistance c_p0 = boost::numeric_cast + < + point_coordinate_type + >( geometry::get<I>(p0) ); + + RelativeDistance c_p1 = boost::numeric_cast + < + point_coordinate_type + >( geometry::get<I>(p1) ); + + RelativeDistance c_b_min = boost::numeric_cast + < + box_coordinate_type + >( geometry::get<geometry::min_corner, I>(box) ); + + RelativeDistance c_b_max = boost::numeric_cast + < + box_coordinate_type + >( geometry::get<geometry::max_corner, I>(box) ); + + if ( geometry::get<I>(p1) >= geometry::get<I>(p0) ) + { + diff = c_p1 - c_p0; + ti_min = c_b_min - c_p0; + ti_max = c_b_max - c_p0; + } + else + { + diff = c_p0 - c_p1; + ti_min = c_p0 - c_b_max; + ti_max = c_p0 - c_b_min; + } + } +}; + + +template +< + typename RelativeDistance, + typename SegmentPoint, + typename Box, + std::size_t I, + std::size_t Dimension +> +struct disjoint_segment_box_impl +{ + template <typename RelativeDistancePair> + static inline bool apply(SegmentPoint const& p0, + SegmentPoint const& p1, + Box const& box, + RelativeDistancePair& t_min, + RelativeDistancePair& t_max) + { + RelativeDistance ti_min, ti_max, diff; + + compute_tmin_tmax_per_dim<I>::apply(p0, p1, box, ti_min, ti_max, diff); + + if ( geometry::math::equals(diff, 0) ) + { + if ( (geometry::math::equals(t_min.second, 0) + && t_min.first > ti_max) + || + (geometry::math::equals(t_max.second, 0) + && t_max.first < ti_min) ) + { + return true; + } + } + + RelativeDistance t_min_x_diff = t_min.first * diff; + RelativeDistance t_max_x_diff = t_max.first * diff; + + if ( t_min_x_diff > ti_max * t_min.second + || t_max_x_diff < ti_min * t_max.second ) + { + return true; + } + + if ( ti_min * t_min.second > t_min_x_diff ) + { + t_min.first = ti_min; + t_min.second = diff; + } + if ( ti_max * t_max.second < t_max_x_diff ) + { + t_max.first = ti_max; + t_max.second = diff; + } + + if ( t_min.first > t_min.second || t_max.first < 0 ) + { + return true; + } + + return disjoint_segment_box_impl + < + RelativeDistance, + SegmentPoint, + Box, + I + 1, + Dimension + >::apply(p0, p1, box, t_min, t_max); + } +}; + + +template +< + typename RelativeDistance, + typename SegmentPoint, + typename Box, + std::size_t Dimension +> +struct disjoint_segment_box_impl + < + RelativeDistance, SegmentPoint, Box, 0, Dimension + > +{ + static inline bool apply(SegmentPoint const& p0, + SegmentPoint const& p1, + Box const& box) + { + std::pair<RelativeDistance, RelativeDistance> t_min, t_max; + RelativeDistance diff; + + compute_tmin_tmax_per_dim<0>::apply(p0, p1, box, + t_min.first, t_max.first, diff); + + if ( geometry::math::equals(diff, 0) ) + { + if ( geometry::math::equals(t_min.first, 0) ) { t_min.first = -1; } + if ( geometry::math::equals(t_max.first, 0) ) { t_max.first = 1; } + } + + if ( t_min.first > diff || t_max.first < 0 ) + { + return true; + } + + t_min.second = t_max.second = diff; + + return disjoint_segment_box_impl + < + RelativeDistance, SegmentPoint, Box, 1, Dimension + >::apply(p0, p1, box, t_min, t_max); + } +}; + + +template +< + typename RelativeDistance, + typename SegmentPoint, + typename Box, + std::size_t Dimension +> +struct disjoint_segment_box_impl + < + RelativeDistance, SegmentPoint, Box, Dimension, Dimension + > +{ + template <typename RelativeDistancePair> + static inline bool apply(SegmentPoint const&, SegmentPoint const&, + Box const&, + RelativeDistancePair&, RelativeDistancePair&) + { + return false; + } +}; + + +//========================================================================= + + +template <typename Segment, typename Box> +struct disjoint_segment_box +{ + static inline bool apply(Segment const& segment, Box const& box) + { + assert_dimension_equal<Segment, Box>(); + + typedef typename util::calculation_type::geometric::binary + < + Segment, Box, void + >::type relative_distance_type; + + typedef typename point_type<Segment>::type segment_point_type; + segment_point_type p0, p1; + geometry::detail::assign_point_from_index<0>(segment, p0); + geometry::detail::assign_point_from_index<1>(segment, p1); + + return disjoint_segment_box_impl + < + relative_distance_type, segment_point_type, Box, + 0, dimension<Box>::value + >::apply(p0, p1, box); + } +}; + + +}} // namespace detail::disjoint +#endif // DOXYGEN_NO_DETAIL + + + +#ifndef DOXYGEN_NO_DISPATCH +namespace dispatch +{ + + +template <typename Segment, typename Box, std::size_t DimensionCount> +struct disjoint<Segment, Box, DimensionCount, segment_tag, box_tag, false> + : detail::disjoint::disjoint_segment_box<Segment, Box> +{}; + + +} // namespace dispatch +#endif // DOXYGEN_NO_DISPATCH + + +}} // namespace boost::geometry + + +#endif // BOOST_GEOMETRY_ALGORITHMS_DETAIL_DISJOINT_SEGMENT_BOX_HPP |