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// Boost.Geometry (aka GGL, Generic Geometry Library)
// Copyright (c) 2007-2013 Barend Gehrels, Amsterdam, the Netherlands.
// Copyright (c) 2008-2013 Bruno Lalande, Paris, France.
// Copyright (c) 2009-2013 Mateusz Loskot, London, UK.
// Copyright (c) 2013-2014 Adam Wulkiewicz, Lodz, Poland.
// This file was modified by Oracle on 2017.
// Modifications copyright (c) 2017 Oracle and/or its affiliates.
// Contributed and/or modified by Adam Wulkiewicz, on behalf of Oracle
// 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_REMOVE_SPIKES_HPP
#define BOOST_GEOMETRY_ALGORITHMS_REMOVE_SPIKES_HPP
#include <deque>
#include <boost/range.hpp>
#include <boost/type_traits/remove_reference.hpp>
#include <boost/variant/apply_visitor.hpp>
#include <boost/variant/static_visitor.hpp>
#include <boost/variant/variant_fwd.hpp>
#include <boost/geometry/core/closure.hpp>
#include <boost/geometry/core/coordinate_type.hpp>
#include <boost/geometry/core/cs.hpp>
#include <boost/geometry/core/interior_rings.hpp>
#include <boost/geometry/core/point_order.hpp>
#include <boost/geometry/core/tags.hpp>
#include <boost/geometry/geometries/concepts/check.hpp>
#include <boost/geometry/algorithms/detail/point_is_spike_or_equal.hpp>
#include <boost/geometry/algorithms/detail/interior_iterator.hpp>
#include <boost/geometry/algorithms/clear.hpp>
#include <boost/geometry/strategies/default_strategy.hpp>
#include <boost/geometry/util/condition.hpp>
#include <boost/geometry/util/range.hpp>
/*
Remove spikes from a ring/polygon.
Ring (having 8 vertices, including closing vertex)
+------+
| |
| +--+
| | ^this "spike" is removed, can be located outside/inside the ring
+------+
(the actualy determination if it is removed is done by a strategy)
*/
namespace boost { namespace geometry
{
#ifndef DOXYGEN_NO_DETAIL
namespace detail { namespace remove_spikes
{
struct range_remove_spikes
{
template <typename Range, typename SideStrategy>
static inline void apply(Range& range, SideStrategy const& strategy)
{
typedef typename point_type<Range>::type point_type;
std::size_t n = boost::size(range);
std::size_t const min_num_points = core_detail::closure::minimum_ring_size
<
geometry::closure<Range>::value
>::value - 1; // subtract one: a polygon with only one spike should result into one point
if (n < min_num_points)
{
return;
}
std::deque<point_type> cleaned;
for (typename boost::range_iterator<Range const>::type it = boost::begin(range);
it != boost::end(range); ++it)
{
// Add point
cleaned.push_back(*it);
while(cleaned.size() >= 3
&& detail::is_spike_or_equal(range::at(cleaned, cleaned.size() - 3),
range::at(cleaned, cleaned.size() - 2),
range::back(cleaned),
strategy))
{
// Remove pen-ultimate point causing the spike (or which was equal)
cleaned.erase(cleaned.end() - 2);
}
}
// For a closed-polygon, remove closing point, this makes checking first point(s) easier and consistent
if ( BOOST_GEOMETRY_CONDITION(geometry::closure<Range>::value == geometry::closed) )
{
cleaned.pop_back();
}
bool found = false;
do
{
found = false;
// Check for spike in first point
int const penultimate = 2;
while(cleaned.size() >= 3
&& detail::is_spike_or_equal(range::at(cleaned, cleaned.size() - penultimate),
range::back(cleaned),
range::front(cleaned),
strategy))
{
cleaned.pop_back();
found = true;
}
// Check for spike in second point
while(cleaned.size() >= 3
&& detail::is_spike_or_equal(range::back(cleaned),
range::front(cleaned),
range::at(cleaned, 1),
strategy))
{
cleaned.pop_front();
found = true;
}
}
while (found);
if (cleaned.size() == 2)
{
// Ticket #9871: open polygon with only two points.
// the second point forms, by definition, a spike
cleaned.pop_back();
}
// Close if necessary
if ( BOOST_GEOMETRY_CONDITION(geometry::closure<Range>::value == geometry::closed) )
{
cleaned.push_back(cleaned.front());
}
// Copy output
geometry::clear(range);
std::copy(cleaned.begin(), cleaned.end(), range::back_inserter(range));
}
};
struct polygon_remove_spikes
{
template <typename Polygon, typename SideStrategy>
static inline void apply(Polygon& polygon, SideStrategy const& strategy)
{
typedef range_remove_spikes per_range;
per_range::apply(exterior_ring(polygon), strategy);
typename interior_return_type<Polygon>::type
rings = interior_rings(polygon);
for (typename detail::interior_iterator<Polygon>::type
it = boost::begin(rings); it != boost::end(rings); ++it)
{
per_range::apply(*it, strategy);
}
}
};
template <typename SingleVersion>
struct multi_remove_spikes
{
template <typename MultiGeometry, typename SideStrategy>
static inline void apply(MultiGeometry& multi, SideStrategy const& strategy)
{
for (typename boost::range_iterator<MultiGeometry>::type
it = boost::begin(multi);
it != boost::end(multi);
++it)
{
SingleVersion::apply(*it, strategy);
}
}
};
}} // namespace detail::remove_spikes
#endif // DOXYGEN_NO_DETAIL
#ifndef DOXYGEN_NO_DISPATCH
namespace dispatch
{
template
<
typename Geometry,
typename Tag = typename tag<Geometry>::type
>
struct remove_spikes
{
template <typename SideStrategy>
static inline void apply(Geometry&, SideStrategy const&)
{}
};
template <typename Ring>
struct remove_spikes<Ring, ring_tag>
: detail::remove_spikes::range_remove_spikes
{};
template <typename Polygon>
struct remove_spikes<Polygon, polygon_tag>
: detail::remove_spikes::polygon_remove_spikes
{};
template <typename MultiPolygon>
struct remove_spikes<MultiPolygon, multi_polygon_tag>
: detail::remove_spikes::multi_remove_spikes
<
detail::remove_spikes::polygon_remove_spikes
>
{};
} // namespace dispatch
#endif
namespace resolve_variant {
template <typename Geometry>
struct remove_spikes
{
template <typename Strategy>
static void apply(Geometry& geometry, Strategy const& strategy)
{
concepts::check<Geometry>();
dispatch::remove_spikes<Geometry>::apply(geometry, strategy);
}
static void apply(Geometry& geometry, geometry::default_strategy const&)
{
typedef typename strategy::side::services::default_strategy
<
typename cs_tag<Geometry>::type
>::type side_strategy;
apply(geometry, side_strategy());
}
};
template <BOOST_VARIANT_ENUM_PARAMS(typename T)>
struct remove_spikes<boost::variant<BOOST_VARIANT_ENUM_PARAMS(T)> >
{
template <typename Strategy>
struct visitor: boost::static_visitor<void>
{
Strategy const& m_strategy;
visitor(Strategy const& strategy) : m_strategy(strategy) {}
template <typename Geometry>
void operator()(Geometry& geometry) const
{
remove_spikes<Geometry>::apply(geometry, m_strategy);
}
};
template <typename Strategy>
static inline void apply(boost::variant<BOOST_VARIANT_ENUM_PARAMS(T)>& geometry,
Strategy const& strategy)
{
boost::apply_visitor(visitor<Strategy>(strategy), geometry);
}
};
} // namespace resolve_variant
/*!
\ingroup remove_spikes
\tparam Geometry geometry type
\param geometry the geometry to make remove_spikes
*/
template <typename Geometry>
inline void remove_spikes(Geometry& geometry)
{
resolve_variant::remove_spikes<Geometry>::apply(geometry, geometry::default_strategy());
}
/*!
\ingroup remove_spikes
\tparam Geometry geometry type
\tparam Strategy side strategy type
\param geometry the geometry to make remove_spikes
\param strategy the side strategy used by the algorithm
*/
template <typename Geometry, typename Strategy>
inline void remove_spikes(Geometry& geometry, Strategy const& strategy)
{
resolve_variant::remove_spikes<Geometry>::apply(geometry, strategy);
}
}} // namespace boost::geometry
#endif // BOOST_GEOMETRY_ALGORITHMS_REMOVE_SPIKES_HPP
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