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// Boost.Geometry (aka GGL, Generic Geometry Library)
// Copyright (c) 2014 Barend Gehrels, Amsterdam, the Netherlands.
// Copyright (c) 2014 Bruno Lalande, Paris, France.
// Copyright (c) 2014 Mateusz Loskot, London, UK.
// Copyright (c) 2014 Adam Wulkiewicz, Lodz, Poland.
// 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_POLICIES_ROBUSTNESS_GET_RESCALE_POLICY_HPP
#define BOOST_GEOMETRY_POLICIES_ROBUSTNESS_GET_RESCALE_POLICY_HPP
#include <cstddef>
#include <boost/type_traits.hpp>
#include <boost/mpl/assert.hpp>
#include <boost/geometry/core/tag_cast.hpp>
#include <boost/geometry/algorithms/envelope.hpp>
#include <boost/geometry/algorithms/expand.hpp>
#include <boost/geometry/algorithms/detail/recalculate.hpp>
#include <boost/geometry/algorithms/detail/get_max_size.hpp>
#include <boost/geometry/policies/robustness/robust_type.hpp>
#include <boost/geometry/geometries/point.hpp>
#include <boost/geometry/geometries/box.hpp>
#include <boost/geometry/policies/robustness/no_rescale_policy.hpp>
#include <boost/geometry/policies/robustness/rescale_policy.hpp>
#include <boost/geometry/util/promote_floating_point.hpp>
namespace boost { namespace geometry
{
#ifndef DOXYGEN_NO_DETAIL
namespace detail { namespace get_rescale_policy
{
template <typename Point, typename RobustPoint, typename Geometry, typename Factor>
static inline void init_rescale_policy(Geometry const& geometry,
Point& min_point,
RobustPoint& min_robust_point,
Factor& factor)
{
// Get bounding boxes
model::box<Point> env = geometry::return_envelope<model::box<Point> >(geometry);
// Scale this to integer-range
typedef typename promote_floating_point
<
typename geometry::coordinate_type<Point>::type
>::type num_type;
num_type const diff = boost::numeric_cast<num_type>(detail::get_max_size(env));
num_type const range = 10000000.0; // Define a large range to get precise integer coordinates
num_type const half = 0.5;
factor = math::equals(diff, num_type()) ? 1
: boost::numeric_cast<num_type>(
boost::numeric_cast<boost::long_long_type>(half + range / diff));
// Assign input/output minimal points
detail::assign_point_from_index<0>(env, min_point);
num_type const two = 2;
boost::long_long_type const min_coordinate
= boost::numeric_cast<boost::long_long_type>(-range / two);
assign_values(min_robust_point, min_coordinate, min_coordinate);
}
template <typename Point, typename RobustPoint, typename Geometry1, typename Geometry2, typename Factor>
static inline void init_rescale_policy(Geometry1 const& geometry1,
Geometry2 const& geometry2,
Point& min_point,
RobustPoint& min_robust_point,
Factor& factor)
{
// Get bounding boxes
model::box<Point> env = geometry::return_envelope<model::box<Point> >(geometry1);
model::box<Point> env2 = geometry::return_envelope<model::box<Point> >(geometry2);
geometry::expand(env, env2);
// TODO: merge this with implementation above
// Scale this to integer-range
typedef typename promote_floating_point
<
typename geometry::coordinate_type<Point>::type
>::type num_type;
num_type const diff = boost::numeric_cast<num_type>(detail::get_max_size(env));
num_type const range = 10000000.0; // Define a large range to get precise integer coordinates
num_type const half = 0.5;
factor = math::equals(diff, num_type()) ? 1
: boost::numeric_cast<num_type>(
boost::numeric_cast<boost::long_long_type>(half + range / diff));
// Assign input/output minimal points
detail::assign_point_from_index<0>(env, min_point);
num_type const two = 2;
boost::long_long_type const min_coordinate
= boost::numeric_cast<boost::long_long_type>(-range / two);
assign_values(min_robust_point, min_coordinate, min_coordinate);
}
template
<
typename Point,
bool IsFloatingPoint
>
struct rescale_policy_type
{
typedef no_rescale_policy type;
};
// We rescale only all FP types
template
<
typename Point
>
struct rescale_policy_type<Point, true>
{
typedef typename geometry::coordinate_type<Point>::type coordinate_type;
typedef model::point
<
typename detail::robust_type<coordinate_type>::type,
geometry::dimension<Point>::value,
typename geometry::coordinate_system<Point>::type
> robust_point_type;
typedef typename promote_floating_point<coordinate_type>::type factor_type;
typedef detail::robust_policy<Point, robust_point_type, factor_type> type;
};
template <typename Policy>
struct get_rescale_policy
{
template <typename Geometry>
static inline Policy apply(Geometry const& geometry)
{
typedef typename point_type<Geometry>::type point_type;
typedef typename geometry::coordinate_type<Geometry>::type coordinate_type;
typedef typename promote_floating_point<coordinate_type>::type factor_type;
typedef model::point
<
typename detail::robust_type<coordinate_type>::type,
geometry::dimension<point_type>::value,
typename geometry::coordinate_system<point_type>::type
> robust_point_type;
point_type min_point;
robust_point_type min_robust_point;
factor_type factor;
init_rescale_policy(geometry, min_point, min_robust_point, factor);
return Policy(min_point, min_robust_point, factor);
}
template <typename Geometry1, typename Geometry2>
static inline Policy apply(Geometry1 const& geometry1, Geometry2 const& geometry2)
{
typedef typename point_type<Geometry1>::type point_type;
typedef typename geometry::coordinate_type<Geometry1>::type coordinate_type;
typedef typename promote_floating_point<coordinate_type>::type factor_type;
typedef model::point
<
typename detail::robust_type<coordinate_type>::type,
geometry::dimension<point_type>::value,
typename geometry::coordinate_system<point_type>::type
> robust_point_type;
point_type min_point;
robust_point_type min_robust_point;
factor_type factor;
init_rescale_policy(geometry1, geometry2, min_point, min_robust_point, factor);
return Policy(min_point, min_robust_point, factor);
}
};
// Specialization for no-rescaling
template <>
struct get_rescale_policy<no_rescale_policy>
{
template <typename Geometry>
static inline no_rescale_policy apply(Geometry const& )
{
return no_rescale_policy();
}
template <typename Geometry1, typename Geometry2>
static inline no_rescale_policy apply(Geometry1 const& , Geometry2 const& )
{
return no_rescale_policy();
}
};
}} // namespace detail::get_rescale_policy
#endif // DOXYGEN_NO_DETAIL
template<typename Point>
struct rescale_policy_type
: public detail::get_rescale_policy::rescale_policy_type
<
Point,
#if defined(BOOST_GEOMETRY_NO_ROBUSTNESS)
false
#else
boost::is_floating_point
<
typename geometry::coordinate_type<Point>::type
>::type::value
#endif
>
{
static const bool is_point
= boost::is_same
<
typename geometry::tag<Point>::type,
geometry::point_tag
>::type::value;
BOOST_MPL_ASSERT_MSG((is_point),
INVALID_INPUT_GEOMETRY,
(typename geometry::tag<Point>::type));
};
template
<
typename Geometry1,
typename Geometry2,
typename Tag1 = typename tag_cast
<
typename tag<Geometry1>::type,
box_tag,
pointlike_tag,
linear_tag,
areal_tag
>::type,
typename Tag2 = typename tag_cast
<
typename tag<Geometry2>::type,
box_tag,
pointlike_tag,
linear_tag,
areal_tag
>::type
>
struct rescale_overlay_policy_type
// Default: no rescaling
: public detail::get_rescale_policy::rescale_policy_type
<
typename geometry::point_type<Geometry1>::type,
false
>
{};
// Areal/areal: get rescale policy based on coordinate type
template
<
typename Geometry1,
typename Geometry2
>
struct rescale_overlay_policy_type<Geometry1, Geometry2, areal_tag, areal_tag>
: public rescale_policy_type
<
typename geometry::point_type<Geometry1>::type
>
{};
template <typename Policy, typename Geometry>
inline Policy get_rescale_policy(Geometry const& geometry)
{
return detail::get_rescale_policy::get_rescale_policy<Policy>::apply(geometry);
}
template <typename Policy, typename Geometry1, typename Geometry2>
inline Policy get_rescale_policy(Geometry1 const& geometry1, Geometry2 const& geometry2)
{
return detail::get_rescale_policy::get_rescale_policy<Policy>::apply(geometry1, geometry2);
}
}} // namespace boost::geometry
#endif // BOOST_GEOMETRY_POLICIES_ROBUSTNESS_GET_RESCALE_POLICY_HPP
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