Chris@102: // Boost.Geometry (aka GGL, Generic Geometry Library)
Chris@102: 
Chris@102: // Copyright (c) 2014 Barend Gehrels, Amsterdam, the Netherlands.
Chris@102: // Copyright (c) 2014 Bruno Lalande, Paris, France.
Chris@102: // Copyright (c) 2014 Mateusz Loskot, London, UK.
Chris@102: // Copyright (c) 2014 Adam Wulkiewicz, Lodz, Poland.
Chris@102: 
Chris@102: // Use, modification and distribution is subject to the Boost Software License,
Chris@102: // Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
Chris@102: // http://www.boost.org/LICENSE_1_0.txt)
Chris@102: 
Chris@102: #ifndef BOOST_GEOMETRY_POLICIES_ROBUSTNESS_RESCALE_POLICY_HPP
Chris@102: #define BOOST_GEOMETRY_POLICIES_ROBUSTNESS_RESCALE_POLICY_HPP
Chris@102: 
Chris@102: #include <cstddef>
Chris@102: 
Chris@102: #include <boost/type_traits.hpp>
Chris@102: 
Chris@102: #include <boost/geometry/policies/robustness/segment_ratio.hpp>
Chris@102: #include <boost/geometry/policies/robustness/segment_ratio_type.hpp>
Chris@102: #include <boost/geometry/policies/robustness/robust_point_type.hpp>
Chris@102: 
Chris@102: namespace boost { namespace geometry
Chris@102: {
Chris@102: 
Chris@102: #ifndef DOXYGEN_NO_DETAIL
Chris@102: namespace detail
Chris@102: {
Chris@102: 
Chris@102: template <typename FpPoint, typename IntPoint, typename CalculationType>
Chris@102: struct robust_policy
Chris@102: {
Chris@102:     static bool const enabled = true;
Chris@102: 
Chris@102:     typedef typename geometry::coordinate_type<IntPoint>::type output_ct;
Chris@102: 
Chris@102:     robust_policy(FpPoint const& fp_min, IntPoint const& int_min, CalculationType const& the_factor)
Chris@102:         : m_fp_min(fp_min)
Chris@102:         , m_int_min(int_min)
Chris@102:         , m_multiplier(the_factor)
Chris@102:     {
Chris@102:     }
Chris@102: 
Chris@102:     template <std::size_t Dimension, typename Value>
Chris@102:     inline output_ct apply(Value const& value) const
Chris@102:     {
Chris@102:         // a + (v-b)*f
Chris@102:         CalculationType const a = static_cast<CalculationType>(get<Dimension>(m_int_min));
Chris@102:         CalculationType const b = static_cast<CalculationType>(get<Dimension>(m_fp_min));
Chris@102:         CalculationType const result = a + (value - b) * m_multiplier;
Chris@102:         return static_cast<output_ct>(result);
Chris@102:     }
Chris@102: 
Chris@102:     FpPoint m_fp_min;
Chris@102:     IntPoint m_int_min;
Chris@102:     CalculationType m_multiplier;
Chris@102: };
Chris@102: 
Chris@102: } // namespace detail
Chris@102: #endif
Chris@102: 
Chris@102: 
Chris@102: // Implement meta-functions for this policy
Chris@102: 
Chris@102: // Define the IntPoint as a robust-point type
Chris@102: template <typename Point, typename FpPoint, typename IntPoint, typename CalculationType>
Chris@102: struct robust_point_type<Point, detail::robust_policy<FpPoint, IntPoint, CalculationType> >
Chris@102: {
Chris@102:     typedef IntPoint type;
Chris@102: };
Chris@102: 
Chris@102: // Meta function for rescaling, if rescaling is done segment_ratio is based on long long
Chris@102: template <typename Point, typename FpPoint, typename IntPoint, typename CalculationType>
Chris@102: struct segment_ratio_type<Point, detail::robust_policy<FpPoint, IntPoint, CalculationType> >
Chris@102: {
Chris@102:     typedef segment_ratio<boost::long_long_type> type;
Chris@102: };
Chris@102: 
Chris@102: 
Chris@102: }} // namespace boost::geometry
Chris@102: 
Chris@102: 
Chris@102: #endif // BOOST_GEOMETRY_POLICIES_ROBUSTNESS_RESCALE_POLICY_HPP