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// Boost.Geometry (aka GGL, Generic Geometry Library)
// Copyright (c) 2007-2012 Barend Gehrels, 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_OVERLAY_SELF_TURN_POINTS_HPP
#define BOOST_GEOMETRY_ALGORITHMS_DETAIL_OVERLAY_SELF_TURN_POINTS_HPP
#include <cstddef>
#include <boost/mpl/vector_c.hpp>
#include <boost/range.hpp>
#include <boost/geometry/core/access.hpp>
#include <boost/geometry/core/coordinate_dimension.hpp>
#include <boost/geometry/core/tags.hpp>
#include <boost/geometry/geometries/concepts/check.hpp>
#include <boost/geometry/algorithms/detail/disjoint/box_box.hpp>
#include <boost/geometry/algorithms/detail/partition.hpp>
#include <boost/geometry/algorithms/detail/overlay/get_turns.hpp>
#include <boost/geometry/algorithms/detail/sections/section_box_policies.hpp>
#include <boost/geometry/geometries/box.hpp>
#include <boost/geometry/util/condition.hpp>
namespace boost { namespace geometry
{
#ifndef DOXYGEN_NO_DETAIL
namespace detail { namespace self_get_turn_points
{
struct no_interrupt_policy
{
static bool const enabled = false;
static bool const has_intersections = false;
template <typename Range>
static inline bool apply(Range const&)
{
return false;
}
};
class self_ip_exception : public geometry::exception {};
template
<
typename Geometry,
typename Turns,
typename TurnPolicy,
typename RobustPolicy,
typename InterruptPolicy
>
struct self_section_visitor
{
Geometry const& m_geometry;
RobustPolicy const& m_rescale_policy;
Turns& m_turns;
InterruptPolicy& m_interrupt_policy;
inline self_section_visitor(Geometry const& g,
RobustPolicy const& rp,
Turns& turns, InterruptPolicy& ip)
: m_geometry(g)
, m_rescale_policy(rp)
, m_turns(turns)
, m_interrupt_policy(ip)
{}
template <typename Section>
inline bool apply(Section const& sec1, Section const& sec2)
{
if (! detail::disjoint::disjoint_box_box(sec1.bounding_box, sec2.bounding_box)
&& ! sec1.duplicate
&& ! sec2.duplicate)
{
detail::get_turns::get_turns_in_sections
<
Geometry, Geometry,
false, false,
Section, Section,
TurnPolicy
>::apply(
0, m_geometry, sec1,
0, m_geometry, sec2,
false,
m_rescale_policy,
m_turns, m_interrupt_policy);
}
if (BOOST_GEOMETRY_CONDITION(m_interrupt_policy.has_intersections))
{
// TODO: we should give partition an interrupt policy.
// Now we throw, and catch below, to stop the partition loop.
throw self_ip_exception();
}
return true;
}
};
template<typename TurnPolicy>
struct get_turns
{
template <typename Geometry, typename RobustPolicy, typename Turns, typename InterruptPolicy>
static inline bool apply(
Geometry const& geometry,
RobustPolicy const& robust_policy,
Turns& turns,
InterruptPolicy& interrupt_policy)
{
typedef model::box
<
typename geometry::robust_point_type
<
typename geometry::point_type<Geometry>::type,
RobustPolicy
>::type
> box_type;
typedef geometry::sections<box_type, 1> sections_type;
typedef boost::mpl::vector_c<std::size_t, 0> dimensions;
sections_type sec;
geometry::sectionalize<false, dimensions>(geometry, robust_policy, sec);
self_section_visitor
<
Geometry,
Turns, TurnPolicy, RobustPolicy, InterruptPolicy
> visitor(geometry, robust_policy, turns, interrupt_policy);
try
{
geometry::partition
<
box_type,
detail::section::get_section_box,
detail::section::overlaps_section_box
>::apply(sec, visitor);
}
catch(self_ip_exception const& )
{
return false;
}
return true;
}
};
}} // namespace detail::self_get_turn_points
#endif // DOXYGEN_NO_DETAIL
#ifndef DOXYGEN_NO_DISPATCH
namespace dispatch
{
template
<
typename GeometryTag,
typename Geometry,
typename TurnPolicy
>
struct self_get_turn_points
{
};
template
<
typename Ring,
typename TurnPolicy
>
struct self_get_turn_points
<
ring_tag, Ring,
TurnPolicy
>
: detail::self_get_turn_points::get_turns<TurnPolicy>
{};
template
<
typename Box,
typename TurnPolicy
>
struct self_get_turn_points
<
box_tag, Box,
TurnPolicy
>
{
template <typename RobustPolicy, typename Turns, typename InterruptPolicy>
static inline bool apply(
Box const& ,
RobustPolicy const& ,
Turns& ,
InterruptPolicy& )
{
return true;
}
};
template
<
typename Polygon,
typename TurnPolicy
>
struct self_get_turn_points
<
polygon_tag, Polygon,
TurnPolicy
>
: detail::self_get_turn_points::get_turns<TurnPolicy>
{};
template
<
typename MultiPolygon,
typename TurnPolicy
>
struct self_get_turn_points
<
multi_polygon_tag, MultiPolygon,
TurnPolicy
>
: detail::self_get_turn_points::get_turns<TurnPolicy>
{};
} // namespace dispatch
#endif // DOXYGEN_NO_DISPATCH
/*!
\brief Calculate self intersections of a geometry
\ingroup overlay
\tparam Geometry geometry type
\tparam Turns type of intersection container
(e.g. vector of "intersection/turn point"'s)
\param geometry geometry
\param robust_policy policy to handle robustness issues
\param turns container which will contain intersection points
\param interrupt_policy policy determining if process is stopped
when intersection is found
*/
template
<
typename AssignPolicy,
typename Geometry,
typename RobustPolicy,
typename Turns,
typename InterruptPolicy
>
inline void self_turns(Geometry const& geometry,
RobustPolicy const& robust_policy,
Turns& turns, InterruptPolicy& interrupt_policy)
{
concepts::check<Geometry const>();
typedef detail::overlay::get_turn_info<detail::overlay::assign_null_policy> turn_policy;
dispatch::self_get_turn_points
<
typename tag<Geometry>::type,
Geometry,
turn_policy
>::apply(geometry, robust_policy, turns, interrupt_policy);
}
}} // namespace boost::geometry
#endif // BOOST_GEOMETRY_ALGORITHMS_DETAIL_OVERLAY_SELF_TURN_POINTS_HPP
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