ceph/src/boost/boost/geometry/policies/robustness/rescale_policy.hpp

   1 // Boost.Geometry (aka GGL, Generic Geometry Library)
   2
   3 // Copyright (c) 2014-2015 Barend Gehrels, Amsterdam, the Netherlands.
   4 // Copyright (c) 2014-2015 Bruno Lalande, Paris, France.
   5 // Copyright (c) 2014-2015 Mateusz Loskot, London, UK.
   6 // Copyright (c) 2014-2015 Adam Wulkiewicz, Lodz, Poland.
   7
   8 // This file was modified by Oracle on 2015, 2018.
   9 // Modifications copyright (c) 2015-2018, Oracle and/or its affiliates.
  10
  11 // Contributed and/or modified by Adam Wulkiewicz, on behalf of Oracle
  12
  13 // Use, modification and distribution is subject to the Boost Software License,
  14 // Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
  15 // http://www.boost.org/LICENSE_1_0.txt)
  16
  17 #ifndef BOOST_GEOMETRY_POLICIES_ROBUSTNESS_RESCALE_POLICY_HPP
  18 #define BOOST_GEOMETRY_POLICIES_ROBUSTNESS_RESCALE_POLICY_HPP
  19
  20 #include <cstddef>
  21
  22 #include <boost/geometry/core/coordinate_type.hpp>
  23
  24 #include <boost/geometry/policies/robustness/segment_ratio.hpp>
  25 #include <boost/geometry/policies/robustness/robust_point_type.hpp>
  26
  27 #include <boost/geometry/util/math.hpp>
  28
  29 namespace boost { namespace geometry
  30 {
  31
  32 #ifndef DOXYGEN_NO_DETAIL
  33 namespace detail
  34 {
  35
  36 template <typename FpPoint, typename IntPoint, typename CalculationType>
  37 struct robust_policy
  38 {
  39     static bool const enabled = true;
  40
  41     typedef typename geometry::coordinate_type<IntPoint>::type output_ct;
  42
  43     robust_policy(FpPoint const& fp_min, IntPoint const& int_min, CalculationType const& the_factor)
  44         : m_fp_min(fp_min)
  45         , m_int_min(int_min)
  46         , m_multiplier(the_factor)
  47     {
  48     }
  49
  50     template <std::size_t Dimension, typename Value>
  51     inline output_ct apply(Value const& value) const
  52     {
  53         // a + (v-b)*f
  54         CalculationType const a = static_cast<CalculationType>(get<Dimension>(m_int_min));
  55         CalculationType const b = static_cast<CalculationType>(get<Dimension>(m_fp_min));
  56         CalculationType const result = a + (value - b) * m_multiplier;
  57
  58         return geometry::math::rounding_cast<output_ct>(result);
  59     }
  60
  61     FpPoint m_fp_min;
  62     IntPoint m_int_min;
  63     CalculationType m_multiplier;
  64 };
  65
  66 } // namespace detail
  67 #endif
  68
  69
  70 // Implement meta-functions for this policy
  71
  72 // Define the IntPoint as a robust-point type
  73 template <typename Point, typename FpPoint, typename IntPoint, typename CalculationType>
  74 struct robust_point_type<Point, detail::robust_policy<FpPoint, IntPoint, CalculationType> >
  75 {
  76     typedef IntPoint type;
  77 };
  78
  79
  80 }} // namespace boost::geometry
  81
  82
  83 #endif // BOOST_GEOMETRY_POLICIES_ROBUSTNESS_RESCALE_POLICY_HPP