Current File : //usr/include/boost/geometry/algorithms/detail/overlay/append_no_dups_or_spikes.hpp
// Boost.Geometry (aka GGL, Generic Geometry Library)
// Copyright (c) 2007-2012 Barend Gehrels, Amsterdam, the Netherlands.
// This file was modified by Oracle on 2014, 2017, 2018.
// Modifications copyright (c) 2014-2018 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_DETAIL_OVERLAY_APPEND_NO_DUPS_OR_SPIKES_HPP
#define BOOST_GEOMETRY_ALGORITHMS_DETAIL_OVERLAY_APPEND_NO_DUPS_OR_SPIKES_HPP
#include <boost/range.hpp>
#include <boost/static_assert.hpp>
#include <boost/geometry/algorithms/append.hpp>
#include <boost/geometry/algorithms/detail/point_is_spike_or_equal.hpp>
#include <boost/geometry/algorithms/detail/equals/point_point.hpp>
#include <boost/geometry/core/closure.hpp>
#include <boost/geometry/util/condition.hpp>
#include <boost/geometry/util/range.hpp>
namespace boost { namespace geometry
{
#ifndef DOXYGEN_NO_DETAIL
namespace detail { namespace overlay
{
// TODO: move this / rename this
template <typename Point1, typename Point2, typename EqualsStrategy, typename RobustPolicy>
inline bool points_equal_or_close(Point1 const& point1,
Point2 const& point2,
EqualsStrategy const& strategy,
RobustPolicy const& robust_policy)
{
if (detail::equals::equals_point_point(point1, point2, strategy))
{
return true;
}
if (BOOST_GEOMETRY_CONDITION(! RobustPolicy::enabled))
{
return false;
}
// Try using specified robust policy
typedef typename geometry::robust_point_type
<
Point1,
RobustPolicy
>::type robust_point_type;
robust_point_type point1_rob, point2_rob;
geometry::recalculate(point1_rob, point1, robust_policy);
geometry::recalculate(point2_rob, point2, robust_policy);
// Only if this is the case the same strategy can be used.
BOOST_STATIC_ASSERT((boost::is_same
<
typename geometry::cs_tag<Point1>::type,
typename geometry::cs_tag<robust_point_type>::type
>::value));
return detail::equals::equals_point_point(point1_rob, point2_rob, strategy);
}
template <typename Range, typename Point, typename SideStrategy, typename RobustPolicy>
inline void append_no_dups_or_spikes(Range& range, Point const& point,
SideStrategy const& strategy,
RobustPolicy const& robust_policy)
{
#ifdef BOOST_GEOMETRY_DEBUG_INTERSECTION
std::cout << " add: ("
<< geometry::get<0>(point) << ", " << geometry::get<1>(point) << ")"
<< std::endl;
#endif
// The code below this condition checks all spikes/dups
// for geometries >= 3 points.
// So we have to check the first potential duplicate differently
if ( boost::size(range) == 1
&& points_equal_or_close(*(boost::begin(range)), point,
strategy.get_equals_point_point_strategy(),
robust_policy) )
{
return;
}
traits::push_back<Range>::apply(range, point);
// If a point is equal, or forming a spike, remove the pen-ultimate point
// because this one caused the spike.
// If so, the now-new-pen-ultimate point can again cause a spike
// (possibly at a corner). So keep doing this.
// Besides spikes it will also avoid adding duplicates.
while(boost::size(range) >= 3
&& point_is_spike_or_equal(point,
*(boost::end(range) - 3),
*(boost::end(range) - 2),
strategy,
robust_policy))
{
// Use the Concept/traits, so resize and append again
traits::resize<Range>::apply(range, boost::size(range) - 2);
traits::push_back<Range>::apply(range, point);
}
}
template <typename Range, typename Point, typename SideStrategy, typename RobustPolicy>
inline void append_no_collinear(Range& range, Point const& point,
SideStrategy const& strategy,
RobustPolicy const& robust_policy)
{
// Stricter version, not allowing any point in a linear row
// (spike, continuation or same point)
// The code below this condition checks all spikes/dups
// for geometries >= 3 points.
// So we have to check the first potential duplicate differently
if ( boost::size(range) == 1
&& points_equal_or_close(*(boost::begin(range)), point,
strategy.get_equals_point_point_strategy(),
robust_policy) )
{
return;
}
traits::push_back<Range>::apply(range, point);
// If a point is equal, or forming a spike, remove the pen-ultimate point
// because this one caused the spike.
// If so, the now-new-pen-ultimate point can again cause a spike
// (possibly at a corner). So keep doing this.
// Besides spikes it will also avoid adding duplicates.
while(boost::size(range) >= 3
&& point_is_collinear(point,
*(boost::end(range) - 3),
*(boost::end(range) - 2),
strategy,
robust_policy))
{
// Use the Concept/traits, so resize and append again
traits::resize<Range>::apply(range, boost::size(range) - 2);
traits::push_back<Range>::apply(range, point);
}
}
template <typename Range, typename SideStrategy, typename RobustPolicy>
inline void clean_closing_dups_and_spikes(Range& range,
SideStrategy const& strategy,
RobustPolicy const& robust_policy)
{
std::size_t const minsize
= core_detail::closure::minimum_ring_size
<
geometry::closure<Range>::value
>::value;
if (boost::size(range) <= minsize)
{
return;
}
typedef typename boost::range_iterator<Range>::type iterator_type;
static bool const closed = geometry::closure<Range>::value == geometry::closed;
// TODO: the following algorithm could be rewritten to first look for spikes
// and then erase some number of points from the beginning of the Range
bool found = false;
do
{
found = false;
iterator_type first = boost::begin(range);
iterator_type second = first + 1;
iterator_type ultimate = boost::end(range) - 1;
if (BOOST_GEOMETRY_CONDITION(closed))
{
ultimate--;
}
// Check if closing point is a spike (this is so if the second point is
// considered as collinear w.r.t. the last segment)
if (point_is_collinear(*second, *ultimate, *first, strategy, robust_policy))
{
range::erase(range, first);
if (BOOST_GEOMETRY_CONDITION(closed))
{
// Remove closing last point
range::resize(range, boost::size(range) - 1);
// Add new closing point
range::push_back(range, range::front(range));
}
found = true;
}
} while(found && boost::size(range) > minsize);
}
}} // namespace detail::overlay
#endif // DOXYGEN_NO_DETAIL
}} // namespace boost::geometry
#endif // BOOST_GEOMETRY_ALGORITHMS_DETAIL_OVERLAY_APPEND_NO_DUPS_OR_SPIKES_HPP
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