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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_BACKTRACK_CHECK_SI_HPP
#define BOOST_GEOMETRY_ALGORITHMS_DETAIL_OVERLAY_BACKTRACK_CHECK_SI_HPP
#include <cstddef>
#include <string>
#include <boost/range.hpp>
#include <boost/geometry/core/access.hpp>
#include <boost/geometry/algorithms/detail/overlay/turn_info.hpp>
#include <boost/geometry/algorithms/detail/has_self_intersections.hpp>
#if defined(BOOST_GEOMETRY_DEBUG_INTERSECTION) || defined(BOOST_GEOMETRY_OVERLAY_REPORT_WKT)
# include <boost/geometry/algorithms/detail/overlay/debug_turn_info.hpp>
# include <boost/geometry/io/wkt/wkt.hpp>
#endif
namespace boost { namespace geometry
{
#ifndef DOXYGEN_NO_DETAIL
namespace detail { namespace overlay
{
template <typename Turns>
inline void clear_visit_info(Turns& turns)
{
typedef typename boost::range_value<Turns>::type tp_type;
for (typename boost::range_iterator<Turns>::type
it = boost::begin(turns);
it != boost::end(turns);
++it)
{
for (typename boost::range_iterator
<
typename tp_type::container_type
>::type op_it = boost::begin(it->operations);
op_it != boost::end(it->operations);
++op_it)
{
op_it->visited.clear();
}
it->discarded = false;
}
}
struct backtrack_state
{
bool m_good;
inline backtrack_state() : m_good(true) {}
inline void reset() { m_good = true; }
inline bool good() const { return m_good; }
};
template
<
typename Geometry1,
typename Geometry2
>
class backtrack_check_self_intersections
{
struct state : public backtrack_state
{
bool m_checked;
inline state()
: m_checked()
{}
};
public :
typedef state state_type;
template <typename Operation, typename Rings, typename Ring, typename Turns, typename RobustPolicy>
static inline void apply(std::size_t size_at_start,
Rings& rings, Ring& ring,
Turns& turns, Operation& operation,
std::string const& ,
Geometry1 const& geometry1,
Geometry2 const& geometry2,
RobustPolicy const& robust_policy,
state_type& state
)
{
state.m_good = false;
// Check self-intersections and throw exception if appropriate
if (! state.m_checked)
{
state.m_checked = true;
has_self_intersections(geometry1, robust_policy);
has_self_intersections(geometry2, robust_policy);
}
// Make bad output clean
rings.resize(size_at_start);
geometry::traits::clear<typename boost::range_value<Rings>::type>::apply(ring);
// Reject this as a starting point
operation.visited.set_rejected();
// And clear all visit info
clear_visit_info(turns);
}
};
#ifdef BOOST_GEOMETRY_OVERLAY_REPORT_WKT
template
<
typename Geometry1,
typename Geometry2
>
class backtrack_debug
{
public :
typedef backtrack_state state_type;
template <typename Operation, typename Rings, typename Turns>
static inline void apply(std::size_t size_at_start,
Rings& rings, typename boost::range_value<Rings>::type& ring,
Turns& turns, Operation& operation,
std::string const& reason,
Geometry1 const& geometry1,
Geometry2 const& geometry2,
state_type& state
)
{
std::cout << " REJECT " << reason << std::endl;
state.m_good = false;
rings.resize(size_at_start);
ring.clear();
operation.visited.set_rejected();
clear_visit_info(turns);
int c = 0;
for (int i = 0; i < turns.size(); i++)
{
for (int j = 0; j < 2; j++)
{
if (turns[i].operations[j].visited.rejected())
{
c++;
}
}
}
std::cout << "BACKTRACK (" << reason << " )"
<< " " << c << " of " << turns.size() << " rejected"
<< std::endl;
std::cout
<< geometry::wkt(geometry1) << std::endl
<< geometry::wkt(geometry2) << std::endl;
}
};
#endif // BOOST_GEOMETRY_OVERLAY_REPORT_WKT
}} // namespace detail::overlay
#endif // DOXYGEN_NO_DETAIL
}} // namespace boost::geometry
#endif // BOOST_GEOMETRY_ALGORITHMS_DETAIL_OVERLAY_BACKTRACK_CHECK_SI_HPP
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