Current File : //usr/include/boost/geometry/algorithms/detail/buffer/buffered_piece_collection.hpp
// Boost.Geometry (aka GGL, Generic Geometry Library)
// Copyright (c) 2012-2014 Barend Gehrels, Amsterdam, the Netherlands.
// Copyright (c) 2017 Adam Wulkiewicz, Lodz, Poland.
// This file was modified by Oracle on 2016-2019.
// Modifications copyright (c) 2016-2019 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_BUFFER_BUFFERED_PIECE_COLLECTION_HPP
#define BOOST_GEOMETRY_ALGORITHMS_DETAIL_BUFFER_BUFFERED_PIECE_COLLECTION_HPP
#include <algorithm>
#include <cstddef>
#include <set>
#include <boost/core/ignore_unused.hpp>
#include <boost/range.hpp>
#include <boost/geometry/core/assert.hpp>
#include <boost/geometry/core/coordinate_type.hpp>
#include <boost/geometry/core/point_type.hpp>
#include <boost/geometry/algorithms/covered_by.hpp>
#include <boost/geometry/algorithms/envelope.hpp>
#include <boost/geometry/strategies/buffer.hpp>
#include <boost/geometry/geometries/ring.hpp>
#include <boost/geometry/algorithms/detail/buffer/buffered_ring.hpp>
#include <boost/geometry/algorithms/detail/buffer/buffer_policies.hpp>
#include <boost/geometry/algorithms/detail/overlay/cluster_info.hpp>
#include <boost/geometry/algorithms/detail/buffer/get_piece_turns.hpp>
#include <boost/geometry/algorithms/detail/buffer/piece_border.hpp>
#include <boost/geometry/algorithms/detail/buffer/turn_in_piece_visitor.hpp>
#include <boost/geometry/algorithms/detail/buffer/turn_in_original_visitor.hpp>
#include <boost/geometry/algorithms/detail/disjoint/point_box.hpp>
#include <boost/geometry/algorithms/detail/overlay/add_rings.hpp>
#include <boost/geometry/algorithms/detail/overlay/assign_parents.hpp>
#include <boost/geometry/algorithms/detail/overlay/enrichment_info.hpp>
#include <boost/geometry/algorithms/detail/overlay/enrich_intersection_points.hpp>
#include <boost/geometry/algorithms/detail/overlay/ring_properties.hpp>
#include <boost/geometry/algorithms/detail/overlay/select_rings.hpp>
#include <boost/geometry/algorithms/detail/overlay/traversal_info.hpp>
#include <boost/geometry/algorithms/detail/overlay/traverse.hpp>
#include <boost/geometry/algorithms/detail/overlay/turn_info.hpp>
#include <boost/geometry/algorithms/detail/partition.hpp>
#include <boost/geometry/algorithms/detail/sections/sectionalize.hpp>
#include <boost/geometry/algorithms/detail/sections/section_box_policies.hpp>
#include <boost/geometry/views/detail/normalized_view.hpp>
#include <boost/geometry/util/range.hpp>
// TODO remove this
#include <boost/geometry/algorithms/detail/overlay/debug_turn_info.hpp>
namespace boost { namespace geometry
{
#ifndef DOXYGEN_NO_DETAIL
namespace detail { namespace buffer
{
/*
* Terminology
*
* Suppose we make a buffer (using blocked corners) of this rectangle:
*
* +-------+
* | |
* | rect |
* | |
* +-------+
*
* For the sides we get these four buffered side-pieces (marked with s)
* and four buffered corner pieces (marked with c)
*
* c---+---s---+---c
* | | piece | | <- see below for details of the middle top-side-piece
* +---+-------+---+
* | | | |
* s | rect | s <- two side pieces left/right of rect
* | | | |
* +---+-------+---+
* | | piece | | <- one side-piece below, and two corner pieces
* c---+---s---+---c
*
* The outer part of the picture above, using all pieces,
* form together the offsetted ring (marked with o below)
* The 8 pieces are part of the piece collection and use for inside-checks
* The inner parts form (using 1 or 2 points per piece, often co-located)
* form together the robust_polygons (marked with r below)
* The remaining piece-segments are helper-segments (marked with h)
*
* ooooooooooooooooo
* o h h o
* ohhhrrrrrrrrrhhho
* o r r o
* o r r o
* o r r o
* ohhhrrrrrrrrrhhho
* o h h o
* ooooooooooooooooo
*
*/
template
<
typename Ring,
typename IntersectionStrategy,
typename DistanceStrategy,
typename RobustPolicy
>
struct buffered_piece_collection
{
typedef typename geometry::point_type<Ring>::type point_type;
typedef typename geometry::coordinate_type<Ring>::type coordinate_type;
// Robust ring/polygon type, always clockwise
typedef geometry::model::ring<point_type> clockwise_ring_type;
typedef geometry::model::box<point_type> box_type;
typedef typename IntersectionStrategy::side_strategy_type side_strategy_type;
typedef typename IntersectionStrategy::envelope_strategy_type envelope_strategy_type;
typedef typename IntersectionStrategy::expand_strategy_type expand_strategy_type;
typedef typename IntersectionStrategy::template area_strategy
<
point_type
>::type area_strategy_type;
typedef typename area_strategy_type::template result_type
<
point_type
>::type area_result_type;
typedef typename IntersectionStrategy::template point_in_geometry_strategy
<
point_type,
clockwise_ring_type
>::type point_in_geometry_strategy_type;
typedef buffer_turn_info
<
point_type,
typename segment_ratio_type<point_type, RobustPolicy>::type
> buffer_turn_info_type;
typedef buffer_turn_operation
<
point_type,
typename segment_ratio_type<point_type, RobustPolicy>::type
> buffer_turn_operation_type;
typedef std::vector<buffer_turn_info_type> turn_vector_type;
typedef piece_border<Ring, point_type> piece_border_type;
struct piece
{
strategy::buffer::piece_type type;
signed_size_type index;
signed_size_type left_index; // points to previous piece of same ring
signed_size_type right_index; // points to next piece of same ring
// The next two members (1, 2) form together a complete clockwise ring
// for each piece (with one dupped point)
// The complete clockwise ring is also included as a robust ring (3)
// 1: half, part of offsetted_rings
// Segment identifier of this piece, including its start index
segment_identifier first_seg_id;
// One-beyond index of this piece, to iterate over a ring
// from: ring.begin() + pc.first_seg_id.segment_index;
// to (not including): ring.begin() + pc.beyond_last_segment_index;
// Its ring_id etc are shared with first_seg_id
signed_size_type beyond_last_segment_index;
// part in offsetted ring which is part of offsetted ring
signed_size_type offsetted_count;
bool is_flat_start;
bool is_flat_end;
bool is_deflated;
// Ring (parts) of this piece, always clockwise
piece_border_type m_piece_border;
point_type m_label_point;
// For a point buffer
point_type m_center;
piece()
: type(strategy::buffer::piece_type_unknown)
, index(-1)
, left_index(-1)
, right_index(-1)
, beyond_last_segment_index(-1)
, offsetted_count(-1)
, is_flat_start(false)
, is_flat_end(false)
, is_deflated(false)
{
}
};
struct original_ring
{
typedef geometry::sections<box_type, 1> sections_type;
// Creates an empty instance
inline original_ring()
: m_is_interior(false)
, m_has_interiors(false)
{}
inline original_ring(clockwise_ring_type const& ring,
bool is_interior, bool has_interiors,
envelope_strategy_type const& envelope_strategy,
expand_strategy_type const& expand_strategy)
: m_ring(ring)
, m_is_interior(is_interior)
, m_has_interiors(has_interiors)
{
geometry::envelope(m_ring, m_box, envelope_strategy);
// create monotonic sections in x-dimension
// The dimension is critical because the direction is later used
// in the optimization for within checks using winding strategy
// and this strategy is scanning in x direction.
typedef boost::mpl::vector_c<std::size_t, 0> dimensions;
geometry::sectionalize<false, dimensions>(m_ring,
detail::no_rescale_policy(), m_sections,
envelope_strategy, expand_strategy);
}
clockwise_ring_type m_ring;
box_type m_box;
sections_type m_sections;
bool m_is_interior;
bool m_has_interiors;
};
typedef std::vector<piece> piece_vector_type;
piece_vector_type m_pieces;
turn_vector_type m_turns;
signed_size_type m_first_piece_index;
bool m_deflate;
bool m_has_deflated;
// Offsetted rings, and representations of original ring(s)
// both indexed by multi_index
buffered_ring_collection<buffered_ring<Ring> > offsetted_rings;
std::vector<original_ring> original_rings;
std::vector<point_type> m_linear_end_points;
buffered_ring_collection<Ring> traversed_rings;
segment_identifier current_segment_id;
// Specificly for offsetted rings around points
// but also for large joins with many points
typedef geometry::sections<box_type, 2> sections_type;
sections_type monotonic_sections;
// Define the clusters, mapping cluster_id -> turns
typedef std::map
<
signed_size_type,
detail::overlay::cluster_info
> cluster_type;
cluster_type m_clusters;
IntersectionStrategy m_intersection_strategy;
DistanceStrategy m_distance_strategy;
side_strategy_type m_side_strategy;
area_strategy_type m_area_strategy;
envelope_strategy_type m_envelope_strategy;
expand_strategy_type m_expand_strategy;
point_in_geometry_strategy_type m_point_in_geometry_strategy;
RobustPolicy const& m_robust_policy;
buffered_piece_collection(IntersectionStrategy const& intersection_strategy,
DistanceStrategy const& distance_strategy,
RobustPolicy const& robust_policy)
: m_first_piece_index(-1)
, m_deflate(false)
, m_has_deflated(false)
, m_intersection_strategy(intersection_strategy)
, m_distance_strategy(distance_strategy)
, m_side_strategy(intersection_strategy.get_side_strategy())
, m_area_strategy(intersection_strategy
.template get_area_strategy<point_type>())
, m_envelope_strategy(intersection_strategy.get_envelope_strategy())
, m_expand_strategy(intersection_strategy.get_expand_strategy())
, m_point_in_geometry_strategy(intersection_strategy
.template get_point_in_geometry_strategy<point_type, clockwise_ring_type>())
, m_robust_policy(robust_policy)
{}
inline bool is_following(buffer_turn_info_type const& turn,
buffer_turn_operation_type const& op)
{
return turn.operations[0].seg_id.segment_index == op.seg_id.segment_index
|| turn.operations[1].seg_id.segment_index == op.seg_id.segment_index;
}
// Verify if turns which are classified as OK (outside or on border of
// offsetted ring) do not traverse through other turns which are classified
// as WITHIN (inside a piece). This can happen if turns are nearly colocated
// and due to floating point precision just classified as within, while
// they should not be within.
// In those cases the turns are fine to travel through (and should),
// but they are not made startable.
template <typename Vector>
inline void pretraverse(Vector const& indexed_operations)
{
// Verify if the turns which are OK don't skip segments
typedef typename boost::range_value<Vector>::type indexed_type;
buffer_turn_operation_type last_traversable_operation;
buffer_turn_info_type last_traversable_turn;
bool first = true;
for (std::size_t i = 0; i < indexed_operations.size(); i++)
{
indexed_type const & itop = indexed_operations[i];
buffer_turn_info_type const& turn = m_turns[itop.turn_index];
if (turn.is_turn_traversable && ! first)
{
// Check previous and next turns. The first is handled
BOOST_GEOMETRY_ASSERT(i > 0);
indexed_type const& previous_itop = indexed_operations[i - 1];
std::size_t const next_index = i + 1 < indexed_operations.size() ? i + 1 : 0;
indexed_type const& next_itop = indexed_operations[next_index];
buffer_turn_info_type& previous_turn = m_turns[previous_itop.turn_index];
buffer_turn_info_type& next_turn = m_turns[next_itop.turn_index];
if (previous_turn.close_to_offset
&& is_following(previous_turn, last_traversable_operation))
{
previous_turn.is_turn_traversable = true;
}
else if (next_turn.close_to_offset
&& is_following(next_turn, last_traversable_operation))
{
next_turn.is_turn_traversable = true;
}
}
if (turn.is_turn_traversable)
{
first = false;
last_traversable_operation = *itop.subject;
last_traversable_turn = turn;
}
}
}
inline void check_linear_endpoints(buffer_turn_info_type& turn) const
{
// TODO this is quadratic. But the #endpoints, expected, is low,
// and only applicable for linear features
// (in a multi linestring with many short lines, the #endpoints can be
// much higher)
for (typename boost::range_iterator<std::vector<point_type> const>::type it
= boost::begin(m_linear_end_points);
it != boost::end(m_linear_end_points);
++it)
{
if (detail::equals::equals_point_point(turn.point, *it,
m_intersection_strategy.get_equals_point_point_strategy()))
{
turn.is_linear_end_point = true;
}
}
}
inline void verify_turns()
{
typedef detail::overlay::indexed_turn_operation
<
buffer_turn_operation_type
> indexed_turn_operation;
typedef std::map
<
ring_identifier,
std::vector<indexed_turn_operation>
> mapped_vector_type;
mapped_vector_type mapped_vector;
detail::overlay::create_map(m_turns, mapped_vector,
enriched_map_buffer_include_policy());
// Sort turns over offsetted ring(s)
for (typename mapped_vector_type::iterator mit
= mapped_vector.begin();
mit != mapped_vector.end();
++mit)
{
std::sort(mit->second.begin(), mit->second.end(), buffer_less());
}
for (typename mapped_vector_type::iterator mit
= mapped_vector.begin();
mit != mapped_vector.end();
++mit)
{
pretraverse(mit->second);
}
}
inline void deflate_check_turns()
{
if (! m_has_deflated)
{
return;
}
// Deflated rings may not travel to themselves, there should at least
// be three turns (which cannot be checked here - TODO: add to traverse)
for (typename boost::range_iterator<turn_vector_type>::type it =
boost::begin(m_turns); it != boost::end(m_turns); ++it)
{
buffer_turn_info_type& turn = *it;
if (! turn.is_turn_traversable)
{
continue;
}
for (int i = 0; i < 2; i++)
{
buffer_turn_operation_type& op = turn.operations[i];
if (op.enriched.get_next_turn_index() == static_cast<signed_size_type>(turn.turn_index)
&& m_pieces[op.seg_id.piece_index].is_deflated)
{
// Keep traversable, but don't start here
op.enriched.startable = false;
}
}
}
}
// Check if a turn is inside any of the originals
inline void check_turn_in_original()
{
typedef turn_in_original_ovelaps_box
<
typename IntersectionStrategy::disjoint_point_box_strategy_type
> turn_in_original_ovelaps_box_type;
typedef original_ovelaps_box
<
typename IntersectionStrategy::disjoint_box_box_strategy_type
> original_ovelaps_box_type;
turn_in_original_visitor
<
turn_vector_type,
point_in_geometry_strategy_type
> visitor(m_turns, m_point_in_geometry_strategy);
geometry::partition
<
box_type,
include_turn_policy,
detail::partition::include_all_policy
>::apply(m_turns, original_rings, visitor,
turn_get_box(), turn_in_original_ovelaps_box_type(),
original_get_box(), original_ovelaps_box_type());
bool const deflate = m_distance_strategy.negative();
for (typename boost::range_iterator<turn_vector_type>::type it =
boost::begin(m_turns); it != boost::end(m_turns); ++it)
{
buffer_turn_info_type& turn = *it;
if (turn.is_turn_traversable)
{
if (deflate && turn.count_in_original <= 0)
{
// For deflate/negative buffers:
// it is not in the original, so don't use it
turn.is_turn_traversable = false;
}
else if (! deflate && turn.count_in_original > 0)
{
// For inflate: it is in original, so don't use it
turn.is_turn_traversable = false;
}
}
}
}
inline void update_turn_administration()
{
std::size_t index = 0;
for (typename boost::range_iterator<turn_vector_type>::type it =
boost::begin(m_turns); it != boost::end(m_turns); ++it, ++index)
{
buffer_turn_info_type& turn = *it;
// Update member used
turn.turn_index = index;
// Verify if a turn is a linear endpoint
if (! turn.is_linear_end_point)
{
check_linear_endpoints(turn);
}
}
}
// Calculate properties of piece borders which are not influenced
// by turns themselves:
// - envelopes (essential for partitioning during calc turns)
// - convexity
// - monotonicity
// - min/max radius of point buffers
// - (if pieces are reversed)
inline void update_piece_administration()
{
for (typename piece_vector_type::iterator it = boost::begin(m_pieces);
it != boost::end(m_pieces);
++it)
{
piece& pc = *it;
piece_border_type& border = pc.m_piece_border;
buffered_ring<Ring> const& ring = offsetted_rings[pc.first_seg_id.multi_index];
if (pc.offsetted_count > 0)
{
if (pc.type != strategy::buffer::buffered_concave)
{
border.set_offsetted(ring, pc.first_seg_id.segment_index,
pc.beyond_last_segment_index);
}
// Calculate envelopes for piece borders
border.get_properties_of_border(pc.type == geometry::strategy::buffer::buffered_point, pc.m_center);
if (! pc.is_flat_end && ! pc.is_flat_start)
{
border.get_properties_of_offsetted_ring_part(m_side_strategy);
}
}
}
}
inline void get_turns()
{
update_piece_administration();
{
// Calculate the turns
piece_turn_visitor
<
piece_vector_type,
buffered_ring_collection<buffered_ring<Ring> >,
turn_vector_type,
IntersectionStrategy,
RobustPolicy
> visitor(m_pieces, offsetted_rings, m_turns,
m_intersection_strategy, m_robust_policy);
typedef detail::section::get_section_box
<
typename IntersectionStrategy::expand_box_strategy_type
> get_section_box_type;
typedef detail::section::overlaps_section_box
<
typename IntersectionStrategy::disjoint_box_box_strategy_type
> overlaps_section_box_type;
detail::sectionalize::enlarge_sections(monotonic_sections,
m_envelope_strategy);
geometry::partition
<
box_type
>::apply(monotonic_sections, visitor,
get_section_box_type(),
overlaps_section_box_type());
}
update_turn_administration();
{
// Check if turns are inside pieces
turn_in_piece_visitor
<
typename geometry::cs_tag<point_type>::type,
turn_vector_type, piece_vector_type, DistanceStrategy
> visitor(m_turns, m_pieces, m_distance_strategy);
typedef turn_ovelaps_box
<
typename IntersectionStrategy::disjoint_point_box_strategy_type
> turn_ovelaps_box_type;
typedef piece_ovelaps_box
<
typename IntersectionStrategy::disjoint_box_box_strategy_type
> piece_ovelaps_box_type;
geometry::partition
<
box_type
>::apply(m_turns, m_pieces, visitor,
turn_get_box(), turn_ovelaps_box_type(),
piece_get_box(), piece_ovelaps_box_type());
}
}
inline void start_new_ring(bool deflate)
{
std::size_t const n = offsetted_rings.size();
current_segment_id.source_index = 0;
current_segment_id.multi_index = static_cast<signed_size_type>(n);
current_segment_id.ring_index = -1;
current_segment_id.segment_index = 0;
offsetted_rings.resize(n + 1);
original_rings.resize(n + 1);
m_first_piece_index = static_cast<signed_size_type>(boost::size(m_pieces));
m_deflate = deflate;
if (deflate)
{
// Pieces contain either deflated exterior rings, or inflated
// interior rings which are effectively deflated too
m_has_deflated = true;
}
}
inline void abort_ring()
{
// Remove all created pieces for this ring, sections, last offsetted
while (! m_pieces.empty()
&& m_pieces.back().first_seg_id.multi_index
== current_segment_id.multi_index)
{
m_pieces.pop_back();
}
offsetted_rings.pop_back();
original_rings.pop_back();
m_first_piece_index = -1;
}
inline void update_last_point(point_type const& p,
buffered_ring<Ring>& ring)
{
// For the first point of a new piece, and there were already
// points in the offsetted ring, for some piece types the first point
// is a duplicate of the last point of the previous piece.
// TODO: disable that, that point should not be added
// For now, it is made equal because due to numerical instability,
// it can be a tiny bit off, possibly causing a self-intersection
BOOST_GEOMETRY_ASSERT(boost::size(m_pieces) > 0);
if (! ring.empty()
&& current_segment_id.segment_index
== m_pieces.back().first_seg_id.segment_index)
{
ring.back() = p;
}
}
inline void set_piece_center(point_type const& center)
{
BOOST_GEOMETRY_ASSERT(! m_pieces.empty());
m_pieces.back().m_center = center;
}
inline bool finish_ring(strategy::buffer::result_code code)
{
if (code == strategy::buffer::result_error_numerical)
{
abort_ring();
return false;
}
if (m_first_piece_index == -1)
{
return false;
}
// Casted version
std::size_t const first_piece_index
= static_cast<std::size_t>(m_first_piece_index);
signed_size_type const last_piece_index
= static_cast<signed_size_type>(boost::size(m_pieces)) - 1;
if (first_piece_index < boost::size(m_pieces))
{
// If pieces were added,
// reassign left-of-first and right-of-last
geometry::range::at(m_pieces, first_piece_index).left_index
= last_piece_index;
geometry::range::back(m_pieces).right_index = m_first_piece_index;
}
buffered_ring<Ring>& added = offsetted_rings.back();
if (! boost::empty(added))
{
// Make sure the closing point is identical (they are calculated
// separately by different pieces)
range::back(added) = range::front(added);
}
for (std::size_t i = first_piece_index; i < boost::size(m_pieces); i++)
{
sectionalize(m_pieces[i], added);
}
m_first_piece_index = -1;
return true;
}
template <typename InputRing>
inline void finish_ring(strategy::buffer::result_code code,
InputRing const& input_ring,
bool is_interior, bool has_interiors)
{
if (! finish_ring(code))
{
return;
}
if (! input_ring.empty())
{
// Assign the ring to the original_ring collection
// For rescaling, it is recalculated. Without rescaling, it
// is just assigning (note that this Ring type is the
// GeometryOut type, which might differ from the input ring type)
clockwise_ring_type clockwise_ring;
typedef detail::normalized_view<InputRing const> view_type;
view_type const view(input_ring);
for (typename boost::range_iterator<view_type const>::type it =
boost::begin(view); it != boost::end(view); ++it)
{
clockwise_ring.push_back(*it);
}
original_rings.back()
= original_ring(clockwise_ring,
is_interior, has_interiors,
m_envelope_strategy, m_expand_strategy);
}
}
inline void set_current_ring_concave()
{
BOOST_GEOMETRY_ASSERT(boost::size(offsetted_rings) > 0);
offsetted_rings.back().has_concave = true;
}
inline signed_size_type add_point(point_type const& p)
{
BOOST_GEOMETRY_ASSERT(boost::size(offsetted_rings) > 0);
buffered_ring<Ring>& current_ring = offsetted_rings.back();
update_last_point(p, current_ring);
current_segment_id.segment_index++;
current_ring.push_back(p);
return static_cast<signed_size_type>(current_ring.size());
}
//-------------------------------------------------------------------------
inline piece& create_piece(strategy::buffer::piece_type type,
bool decrease_segment_index_by_one)
{
if (type == strategy::buffer::buffered_concave)
{
offsetted_rings.back().has_concave = true;
}
piece pc;
pc.type = type;
pc.index = static_cast<signed_size_type>(boost::size(m_pieces));
pc.is_deflated = m_deflate;
current_segment_id.piece_index = pc.index;
pc.first_seg_id = current_segment_id;
// Assign left/right (for first/last piece per ring they will be re-assigned later)
pc.left_index = pc.index - 1;
pc.right_index = pc.index + 1;
std::size_t const n = boost::size(offsetted_rings.back());
pc.first_seg_id.segment_index = decrease_segment_index_by_one ? n - 1 : n;
pc.beyond_last_segment_index = pc.first_seg_id.segment_index;
m_pieces.push_back(pc);
return m_pieces.back();
}
inline void init_rescale_piece(piece& pc)
{
if (pc.first_seg_id.segment_index < 0)
{
// This indicates an error situation: an earlier piece was empty
// It currently does not happen
pc.offsetted_count = 0;
return;
}
BOOST_GEOMETRY_ASSERT(pc.first_seg_id.multi_index >= 0);
BOOST_GEOMETRY_ASSERT(pc.beyond_last_segment_index >= 0);
pc.offsetted_count = pc.beyond_last_segment_index - pc.first_seg_id.segment_index;
BOOST_GEOMETRY_ASSERT(pc.offsetted_count >= 0);
}
inline void add_piece_point(piece& pc, const point_type& point, bool add_to_original)
{
if (add_to_original && pc.type != strategy::buffer::buffered_concave)
{
pc.m_piece_border.add_original_point(point);
}
else
{
pc.m_label_point = point;
}
}
inline void sectionalize(piece const& pc, buffered_ring<Ring> const& ring)
{
typedef geometry::detail::sectionalize::sectionalize_part
<
point_type,
boost::mpl::vector_c<std::size_t, 0, 1> // x,y dimension
> sectionalizer;
// Create a ring-identifier. The source-index is the piece index
// The multi_index is as in this collection (the ring), but not used here
// The ring_index is not used
ring_identifier const ring_id(pc.index, pc.first_seg_id.multi_index, -1);
sectionalizer::apply(monotonic_sections,
boost::begin(ring) + pc.first_seg_id.segment_index,
boost::begin(ring) + pc.beyond_last_segment_index,
m_robust_policy,
ring_id, 10);
}
inline void finish_piece(piece& pc)
{
init_rescale_piece(pc);
}
inline void finish_piece(piece& pc,
point_type const& point1,
point_type const& point2,
point_type const& point3)
{
init_rescale_piece(pc);
if (pc.offsetted_count == 0)
{
return;
}
add_piece_point(pc, point1, false);
add_piece_point(pc, point2, true);
add_piece_point(pc, point3, false);
}
inline void finish_piece(piece& pc,
point_type const& point1,
point_type const& point2,
point_type const& point3,
point_type const& point4)
{
init_rescale_piece(pc);
// Add the four points. Note that points 2 and 3 are the originals,
// and that they are already passed in reverse order
// (because the offsetted ring is in clockwise order)
add_piece_point(pc, point1, false);
add_piece_point(pc, point2, true);
add_piece_point(pc, point3, true);
add_piece_point(pc, point4, false);
}
template <typename Range>
inline void add_range_to_piece(piece& pc, Range const& range, bool add_front)
{
BOOST_GEOMETRY_ASSERT(boost::size(range) != 0u);
typename Range::const_iterator it = boost::begin(range);
// If it follows a non-join (so basically the same piece-type) point b1 should be added.
// There should be two intersections later and it should be discarded.
// But for now we need it to calculate intersections
if (add_front)
{
add_point(*it);
}
for (++it; it != boost::end(range); ++it)
{
pc.beyond_last_segment_index = add_point(*it);
}
}
inline void add_piece(strategy::buffer::piece_type type, point_type const& p,
point_type const& b1, point_type const& b2)
{
piece& pc = create_piece(type, false);
add_point(b1);
pc.beyond_last_segment_index = add_point(b2);
finish_piece(pc, b2, p, b1);
}
template <typename Range>
inline void add_piece(strategy::buffer::piece_type type, Range const& range,
bool decrease_segment_index_by_one)
{
piece& pc = create_piece(type, decrease_segment_index_by_one);
if (boost::size(range) > 0u)
{
add_range_to_piece(pc, range, offsetted_rings.back().empty());
}
finish_piece(pc);
}
template <typename Range>
inline void add_piece(strategy::buffer::piece_type type,
point_type const& p, Range const& range)
{
piece& pc = create_piece(type, true);
if (boost::size(range) > 0u)
{
add_range_to_piece(pc, range, offsetted_rings.back().empty());
finish_piece(pc, range.back(), p, range.front());
}
else
{
finish_piece(pc);
}
}
template <typename Range>
inline void add_side_piece(point_type const& original_point1,
point_type const& original_point2,
Range const& range, bool first)
{
BOOST_GEOMETRY_ASSERT(boost::size(range) >= 2u);
piece& pc = create_piece(strategy::buffer::buffered_segment, ! first);
add_range_to_piece(pc, range, first);
// Add the four points of the side, starting with the last point of the
// range, and reversing the order of the originals to keep it clockwise
finish_piece(pc, range.back(), original_point2, original_point1, range.front());
}
template <typename EndcapStrategy, typename Range>
inline void add_endcap(EndcapStrategy const& strategy, Range const& range,
point_type const& end_point)
{
boost::ignore_unused(strategy);
if (range.empty())
{
return;
}
strategy::buffer::piece_type pt = strategy.get_piece_type();
if (pt == strategy::buffer::buffered_flat_end)
{
// It is flat, should just be added, without helper segments
add_piece(pt, range, true);
}
else
{
// Normal case, it has an "inside", helper segments should be added
add_piece(pt, end_point, range);
}
}
inline void mark_flat_start(point_type const& point)
{
if (! m_pieces.empty())
{
piece& back = m_pieces.back();
back.is_flat_start = true;
// This happens to linear buffers, and it will be the very
// first or last point. If that coincides with a turn,
// and the turn was marked as ON_BORDER
// the turn should NOT be within (even though it can be marked
// as such)
m_linear_end_points.push_back(point);
}
}
inline void mark_flat_end(point_type const& point)
{
if (! m_pieces.empty())
{
piece& back = m_pieces.back();
back.is_flat_end = true;
m_linear_end_points.push_back(point);
}
}
//-------------------------------------------------------------------------
inline void enrich()
{
enrich_intersection_points<false, false, overlay_buffer>(m_turns,
m_clusters, offsetted_rings, offsetted_rings,
m_robust_policy,
m_intersection_strategy);
}
// Discards all rings which do have not-OK intersection points only.
// Those can never be traversed and should not be part of the output.
inline void discard_rings()
{
for (typename boost::range_iterator<turn_vector_type const>::type it =
boost::begin(m_turns); it != boost::end(m_turns); ++it)
{
if (it->is_turn_traversable)
{
offsetted_rings[it->operations[0].seg_id.multi_index].has_accepted_intersections = true;
offsetted_rings[it->operations[1].seg_id.multi_index].has_accepted_intersections = true;
}
else
{
offsetted_rings[it->operations[0].seg_id.multi_index].has_discarded_intersections = true;
offsetted_rings[it->operations[1].seg_id.multi_index].has_discarded_intersections = true;
}
}
}
inline bool point_coveredby_original(point_type const& point)
{
typedef typename IntersectionStrategy::disjoint_point_box_strategy_type d_pb_strategy_type;
signed_size_type count_in_original = 0;
// Check of the robust point of this outputted ring is in
// any of the robust original rings
// This can go quadratic if the input has many rings, and there
// are many untouched deflated rings around
for (typename std::vector<original_ring>::const_iterator it
= original_rings.begin();
it != original_rings.end();
++it)
{
original_ring const& original = *it;
if (original.m_ring.empty())
{
continue;
}
if (detail::disjoint::disjoint_point_box(point,
original.m_box,
d_pb_strategy_type()))
{
continue;
}
int const geometry_code
= detail::within::point_in_geometry(point,
original.m_ring, m_point_in_geometry_strategy);
if (geometry_code == -1)
{
// Outside, continue
continue;
}
// Apply for possibly nested interior rings
if (original.m_is_interior)
{
count_in_original--;
}
else if (original.m_has_interiors)
{
count_in_original++;
}
else
{
// Exterior ring without interior rings
return true;
}
}
return count_in_original > 0;
}
// For a deflate, all rings around inner rings which are untouched
// (no intersections/turns) and which are OUTSIDE the original should
// be discarded
inline void discard_nonintersecting_deflated_rings()
{
for(typename buffered_ring_collection<buffered_ring<Ring> >::iterator it
= boost::begin(offsetted_rings);
it != boost::end(offsetted_rings);
++it)
{
buffered_ring<Ring>& ring = *it;
if (! ring.has_intersections()
&& boost::size(ring) > 0u
&& geometry::area(ring, m_area_strategy) < 0)
{
if (! point_coveredby_original(geometry::range::front(ring)))
{
ring.is_untouched_outside_original = true;
}
}
}
}
inline void block_turns()
{
for (typename boost::range_iterator<turn_vector_type>::type it =
boost::begin(m_turns); it != boost::end(m_turns); ++it)
{
buffer_turn_info_type& turn = *it;
if (! turn.is_turn_traversable)
{
// Discard this turn (don't set it to blocked to avoid colocated
// clusters being discarded afterwards
turn.discarded = true;
}
}
}
inline void traverse()
{
typedef detail::overlay::traverse
<
false, false,
buffered_ring_collection<buffered_ring<Ring> >,
buffered_ring_collection<buffered_ring<Ring > >,
overlay_buffer,
backtrack_for_buffer
> traverser;
std::map<ring_identifier, overlay::ring_turn_info> turn_info_per_ring;
traversed_rings.clear();
buffer_overlay_visitor visitor;
traverser::apply(offsetted_rings, offsetted_rings,
m_intersection_strategy, m_robust_policy,
m_turns, traversed_rings,
turn_info_per_ring,
m_clusters, visitor);
}
inline void reverse()
{
for(typename buffered_ring_collection<buffered_ring<Ring> >::iterator it = boost::begin(offsetted_rings);
it != boost::end(offsetted_rings);
++it)
{
if (! it->has_intersections())
{
std::reverse(it->begin(), it->end());
}
}
for (typename boost::range_iterator<buffered_ring_collection<Ring> >::type
it = boost::begin(traversed_rings);
it != boost::end(traversed_rings);
++it)
{
std::reverse(it->begin(), it->end());
}
}
template <typename GeometryOutput, typename OutputIterator>
inline OutputIterator assign(OutputIterator out) const
{
typedef detail::overlay::ring_properties<point_type, area_result_type> properties;
std::map<ring_identifier, properties> selected;
// Select all rings which do not have any self-intersection
// Inner rings, for deflate, which do not have intersections, and
// which are outside originals, are skipped
// (other ones should be traversed)
signed_size_type index = 0;
for(typename buffered_ring_collection<buffered_ring<Ring> >::const_iterator it = boost::begin(offsetted_rings);
it != boost::end(offsetted_rings);
++it, ++index)
{
if (! it->has_intersections()
&& ! it->is_untouched_outside_original)
{
properties p = properties(*it, m_area_strategy);
if (p.valid)
{
ring_identifier id(0, index, -1);
selected[id] = p;
}
}
}
// Select all created rings
index = 0;
for (typename boost::range_iterator<buffered_ring_collection<Ring> const>::type
it = boost::begin(traversed_rings);
it != boost::end(traversed_rings);
++it, ++index)
{
properties p = properties(*it, m_area_strategy);
if (p.valid)
{
ring_identifier id(2, index, -1);
selected[id] = p;
}
}
detail::overlay::assign_parents<overlay_buffer>(offsetted_rings, traversed_rings,
selected, m_intersection_strategy);
return detail::overlay::add_rings<GeometryOutput>(selected, offsetted_rings, traversed_rings, out,
m_area_strategy);
}
};
}} // namespace detail::buffer
#endif // DOXYGEN_NO_DETAIL
}} // namespace boost::geometry
#endif // BOOST_GEOMETRY_ALGORITHMS_DETAIL_BUFFER_BUFFERED_PIECE_COLLECTION_HPP
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