416 lines
13 KiB
C++
416 lines
13 KiB
C++
// Boost.Geometry (aka GGL, Generic Geometry Library)
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// Copyright (c) 2014-2015 Barend Gehrels, Amsterdam, the Netherlands.
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// Copyright (c) 2014-2015 Bruno Lalande, Paris, France.
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// Copyright (c) 2014-2015 Mateusz Loskot, London, UK.
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// Copyright (c) 2014-2015 Adam Wulkiewicz, Lodz, Poland.
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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 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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// Use, modification and distribution is subject to the Boost Software License,
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// Version 1.0. (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_POLICIES_ROBUSTNESS_GET_RESCALE_POLICY_HPP
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#define BOOST_GEOMETRY_POLICIES_ROBUSTNESS_GET_RESCALE_POLICY_HPP
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#include <cstddef>
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#include <type_traits>
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#include <boost/geometry/core/assert.hpp>
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#include <boost/geometry/core/config.hpp>
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#include <boost/geometry/core/coordinate_promotion.hpp>
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#include <boost/geometry/core/tag_cast.hpp>
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#include <boost/geometry/algorithms/envelope.hpp>
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#include <boost/geometry/algorithms/expand.hpp>
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#include <boost/geometry/algorithms/is_empty.hpp>
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#include <boost/geometry/algorithms/detail/recalculate.hpp>
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#include <boost/geometry/algorithms/detail/get_max_size.hpp>
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#include <boost/geometry/core/static_assert.hpp>
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#include <boost/geometry/geometries/point.hpp>
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#include <boost/geometry/geometries/box.hpp>
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#include <boost/geometry/policies/robustness/no_rescale_policy.hpp>
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#include <boost/geometry/policies/robustness/rescale_policy.hpp>
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#include <boost/geometry/policies/robustness/robust_type.hpp>
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#include <boost/geometry/util/type_traits.hpp>
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// TEMP
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#include <boost/geometry/strategies/envelope/cartesian.hpp>
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#include <boost/geometry/strategies/envelope/geographic.hpp>
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#include <boost/geometry/strategies/envelope/spherical.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 get_rescale_policy
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{
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template
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<
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typename Box,
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typename Point,
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typename RobustPoint,
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typename Factor
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>
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inline void scale_box_to_integer_range(Box const& box,
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Point& min_point,
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RobustPoint& min_robust_point,
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Factor& factor)
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{
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// Scale box to integer-range
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typedef typename promote_floating_point
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<
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typename geometry::coordinate_type<Point>::type
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>::type num_type;
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num_type const diff = boost::numeric_cast<num_type>(detail::get_max_size(box));
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num_type const range = 10000000.0; // Define a large range to get precise integer coordinates
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num_type const half = 0.5;
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if (math::equals(diff, num_type())
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|| diff >= range
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|| ! boost::math::isfinite(diff))
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{
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factor = 1;
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}
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else
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{
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factor = boost::numeric_cast<num_type>(
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boost::numeric_cast<boost::long_long_type>(half + range / diff));
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BOOST_GEOMETRY_ASSERT(factor >= 1);
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}
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// Assign input/output minimal points
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detail::assign_point_from_index<0>(box, min_point);
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num_type const two = 2;
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boost::long_long_type const min_coordinate
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= boost::numeric_cast<boost::long_long_type>(-range / two);
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assign_values(min_robust_point, min_coordinate, min_coordinate);
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}
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template
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<
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typename Point, typename RobustPoint, typename Geometry,
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typename Factor, typename Strategy
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>
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static inline void init_rescale_policy(Geometry const& geometry,
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Point& min_point,
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RobustPoint& min_robust_point,
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Factor& factor,
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Strategy const& strategy)
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{
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if (geometry::is_empty(geometry))
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{
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return;
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}
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// Get bounding box
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model::box<Point> env = geometry::return_envelope
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<
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model::box<Point>
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>(geometry, strategy);
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scale_box_to_integer_range(env, min_point, min_robust_point, factor);
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}
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// NOTE: Actually it should take 2 separate strategies, one for each geometry
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// in case one of them was e.g. a Box
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template
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<
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typename Point, typename RobustPoint, typename Geometry1, typename Geometry2,
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typename Factor, typename Strategy1, typename Strategy2
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>
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static inline void init_rescale_policy(Geometry1 const& geometry1,
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Geometry2 const& geometry2,
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Point& min_point,
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RobustPoint& min_robust_point,
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Factor& factor,
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Strategy1 const& strategy1,
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Strategy2 const& strategy2)
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{
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// Get bounding boxes (when at least one of the geometries is not empty)
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bool const is_empty1 = geometry::is_empty(geometry1);
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bool const is_empty2 = geometry::is_empty(geometry2);
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if (is_empty1 && is_empty2)
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{
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return;
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}
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model::box<Point> env;
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if (is_empty1)
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{
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geometry::envelope(geometry2, env, strategy2);
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}
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else if (is_empty2)
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{
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geometry::envelope(geometry1, env, strategy1);
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}
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else
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{
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// The following approach (envelope + expand) may not give the
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// optimal MBR when then two geometries are in the spherical
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// equatorial or geographic coordinate systems.
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// TODO: implement envelope for two (or possibly more geometries)
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geometry::envelope(geometry1, env, strategy1);
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model::box<Point> env2 = geometry::return_envelope
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<
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model::box<Point>
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>(geometry2, strategy2);
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geometry::expand(env, env2, strategy1);
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}
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scale_box_to_integer_range(env, min_point, min_robust_point, factor);
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}
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template
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<
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typename Point,
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bool IsFloatingPoint
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>
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struct rescale_policy_type
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{
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typedef no_rescale_policy type;
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};
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// We rescale only all FP types
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template
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<
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typename Point
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>
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struct rescale_policy_type<Point, true>
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{
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typedef typename geometry::coordinate_type<Point>::type coordinate_type;
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typedef model::point
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<
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typename detail::robust_type<coordinate_type>::type,
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geometry::dimension<Point>::value,
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typename geometry::coordinate_system<Point>::type
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> robust_point_type;
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typedef typename promote_floating_point<coordinate_type>::type factor_type;
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typedef detail::robust_policy<Point, robust_point_type, factor_type> type;
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};
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template <typename Policy>
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struct get_rescale_policy
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{
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template <typename Geometry, typename Strategy>
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static inline Policy apply(Geometry const& geometry,
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Strategy const& strategy)
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{
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typedef typename point_type<Geometry>::type point_type;
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typedef typename geometry::coordinate_type<Geometry>::type coordinate_type;
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typedef typename promote_floating_point<coordinate_type>::type factor_type;
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typedef model::point
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<
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typename detail::robust_type<coordinate_type>::type,
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geometry::dimension<point_type>::value,
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typename geometry::coordinate_system<point_type>::type
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> robust_point_type;
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point_type min_point;
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robust_point_type min_robust_point;
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factor_type factor;
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init_rescale_policy(geometry, min_point, min_robust_point,
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factor, strategy);
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return Policy(min_point, min_robust_point, factor);
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}
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template <typename Geometry1, typename Geometry2, typename Strategy1, typename Strategy2>
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static inline Policy apply(Geometry1 const& geometry1, Geometry2 const& geometry2,
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Strategy1 const& strategy1,
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Strategy2 const& strategy2)
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{
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typedef typename point_type<Geometry1>::type point_type;
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typedef typename geometry::coordinate_type<Geometry1>::type coordinate_type;
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typedef typename promote_floating_point<coordinate_type>::type factor_type;
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typedef model::point
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<
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typename detail::robust_type<coordinate_type>::type,
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geometry::dimension<point_type>::value,
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typename geometry::coordinate_system<point_type>::type
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> robust_point_type;
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point_type min_point;
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robust_point_type min_robust_point;
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factor_type factor;
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init_rescale_policy(geometry1, geometry2, min_point, min_robust_point,
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factor, strategy1, strategy2);
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return Policy(min_point, min_robust_point, factor);
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}
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};
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// Specialization for no-rescaling
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template <>
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struct get_rescale_policy<no_rescale_policy>
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{
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template <typename Geometry, typename EnvelopeStrategy>
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static inline no_rescale_policy apply(Geometry const& , EnvelopeStrategy const&)
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{
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return no_rescale_policy();
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}
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template <typename Geometry1, typename Geometry2, typename EnvelopeStrategy1, typename EnvelopeStrategy2>
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static inline no_rescale_policy apply(Geometry1 const& , Geometry2 const& ,
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EnvelopeStrategy1 const& , EnvelopeStrategy2 const& )
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{
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return no_rescale_policy();
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}
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};
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}} // namespace detail::get_rescale_policy
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#endif // DOXYGEN_NO_DETAIL
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template
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<
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typename Point,
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typename CSTag = typename geometry::cs_tag<Point>::type
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>
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struct rescale_policy_type
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: public detail::get_rescale_policy::rescale_policy_type
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<
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Point,
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#if defined(BOOST_GEOMETRY_USE_RESCALING)
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std::is_floating_point
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<
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typename geometry::coordinate_type<Point>::type
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>::type::value
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&&
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std::is_same
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<
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CSTag,
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geometry::cartesian_tag
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>::value
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#else
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false
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#endif
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>
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{
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BOOST_GEOMETRY_STATIC_ASSERT(
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(util::is_point<Point>::value),
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"Point type expected.",
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Point);
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};
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template
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<
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typename Geometry1,
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typename Geometry2,
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typename CSTag = typename geometry::cs_tag<Geometry1>::type,
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typename Tag1 = typename tag_cast
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<
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typename tag<Geometry1>::type,
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box_tag,
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pointlike_tag,
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linear_tag,
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areal_tag
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>::type,
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typename Tag2 = typename tag_cast
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<
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typename tag<Geometry2>::type,
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box_tag,
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pointlike_tag,
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linear_tag,
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areal_tag
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>::type
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>
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struct rescale_overlay_policy_type
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// Default: no rescaling
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: public detail::get_rescale_policy::rescale_policy_type
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<
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typename geometry::point_type<Geometry1>::type,
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false
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>
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{};
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// Areal/areal: get rescale policy based on coordinate type
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template
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<
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typename Geometry1,
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typename Geometry2,
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typename CSTag
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>
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struct rescale_overlay_policy_type<Geometry1, Geometry2, CSTag, areal_tag, areal_tag>
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: public rescale_policy_type
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<
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typename geometry::point_type<Geometry1>::type,
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CSTag
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>
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{};
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template <typename Policy, typename Geometry>
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inline Policy get_rescale_policy(Geometry const& geometry)
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{
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typename geometry::strategies::envelope::services::default_strategy
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<
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Geometry,
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model::box<typename point_type<Geometry>::type>
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>::type strategy;
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return detail::get_rescale_policy::get_rescale_policy<Policy>::apply(geometry, strategy);
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}
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template
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<
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typename Policy, typename Geometry, typename Strategy,
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std::enable_if_t<std::is_void<typename geometry::tag<Strategy>::type>::value, int> = 0
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>
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inline Policy get_rescale_policy(Geometry const& geometry, Strategy const& strategy)
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{
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return detail::get_rescale_policy::get_rescale_policy
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<
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Policy
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>::apply(geometry, strategy);
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}
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template
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<
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typename Policy, typename Geometry1, typename Geometry2,
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std::enable_if_t<! std::is_void<typename geometry::tag<Geometry2>::type>::value, int> = 0
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>
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inline Policy get_rescale_policy(Geometry1 const& geometry1, Geometry2 const& geometry2)
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{
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typename geometry::strategies::envelope::services::default_strategy
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<
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Geometry1,
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model::box<typename point_type<Geometry1>::type>
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>::type strategy1;
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typename geometry::strategies::envelope::services::default_strategy
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<
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Geometry2,
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model::box<typename point_type<Geometry2>::type>
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>::type strategy2;
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return detail::get_rescale_policy::get_rescale_policy
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<
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Policy
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>::apply(geometry1, geometry2, strategy1, strategy2);
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}
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template <typename Policy, typename Geometry1, typename Geometry2, typename Strategy>
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inline Policy get_rescale_policy(Geometry1 const& geometry1, Geometry2 const& geometry2,
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Strategy const& strategy)
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{
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return detail::get_rescale_policy::get_rescale_policy
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<
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Policy
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>::apply(geometry1, geometry2, strategy, strategy);
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}
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}} // namespace boost::geometry
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#endif // BOOST_GEOMETRY_POLICIES_ROBUSTNESS_GET_RESCALE_POLICY_HPP
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