CGAL 6.1 - Shape Regularization

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CGAL::Shape_regularization::Segments::Delaunay_neighbor_query_2< GeomTraits, InputRange, SegmentMap > Class Template Reference
Reference Manual » Segments

`#include <CGAL/Shape_regularization/Segments/Delaunay_neighbor_query_2.h>`

## Definition

template<typename GeomTraits, typename InputRange, typename SegmentMap = CGAL::Identity_property_map<typename GeomTraits::Segment_2>>
class CGAL::Shape_regularization::Segments::Delaunay_neighbor_query_2< GeomTraits, InputRange, SegmentMap >

A neighbor query based on a Delaunay triangulation, which enables to find the nearest neighbors in a set of `GeomTraits::Segment_2`.

This class finds indices of the nearest neighbors of a query segment in a set of 2D segments.

The class first creates a Delaunay triangulation whose vertices are center points of the input segments and then enables to return for each query segment indices of the segments whose center points form the one-ring neighborhood of the corresponding query vertex in the triangulation.

Template Parameters

  GeomTraits | a model of `Kernel`
  InputRange | a model of `ConstRange` whose iterator type is `RandomAccessIterator`
  SegmentMap | a model of `ReadablePropertyMap` whose key type is the value type of the `InputRange` and value type is `GeomTraits::Segment_2`. The default is `CGAL::Identity_property_map<typename GeomTraits::Segment_2>`.

Is model of
  `NeighborQuery`

Examples
  Shape_regularization/regularize_100_segments_angles.cpp, Shape_regularization/regularize_100_segments_offsets.cpp, Shape_regularization/regularize_15_segments.cpp, and Shape_regularization/regularize_real_data_2.cpp.

## Initialization
template<typename NamedParameters = parameters::Default_named_parameters>
| Delaunay_neighbor_query_2 (const InputRange &input_range, const NamedParameters &np=parameters::default_values())
| initializes all internal data structures.
template<typename IndexRange >
void | add_group (const IndexRange &index_range)
| inserts a group of segments from `input_range` and finds their neighbors within the group.

## Access
void | operator() (const std::size_t query_index, std::vector< std::size_t > &neighbors) const
| fills in a vector with indices of segments, which are direct neighbors of the query segment.

## Memory Management
void | clear ()
| clears all internal data structures.

## Constructor & Destructor Documentation

## ◆ Delaunay_neighbor_query_2()

template<typename GeomTraits , typename InputRange , typename SegmentMap = CGAL::Identity_property_map<typename GeomTraits::Segment_2>>
template<typename NamedParameters = parameters::Default_named_parameters>

CGAL::Shape_regularization::Segments::Delaunay_neighbor_query_2< GeomTraits, InputRange, SegmentMap >::Delaunay_neighbor_query_2 | ( | const InputRange & | input_range,
|  | const NamedParameters & | np = `parameters::default_values()`
| ) |  |

initializes all internal data structures.

Template Parameters

  NamedParameters | a sequence of Named Parameters

Parameters

  input_range | a const range of 2D segments
  np | an optional sequence of Named Parameters among the ones listed below; this parameter can be omitted, the default values are then used

Optional Named Parameters

  an instance of `SegmentMap` that maps an item from `input_range` to `GeomTraits::Segment_2` Default: `SegmentMap()` |

Precondition
  input_range.size() >= 2

## Member Function Documentation

## ◆ add_group()

template<typename GeomTraits , typename InputRange , typename SegmentMap = CGAL::Identity_property_map<typename GeomTraits::Segment_2>>
template<typename IndexRange >

void CGAL::Shape_regularization::Segments::Delaunay_neighbor_query_2< GeomTraits, InputRange, SegmentMap >::add_group | ( | const IndexRange & | index_range | ) |

inserts a group of segments from `input_range` and finds their neighbors within the group.

Each group of segments is provided as a collection of their indices and only neighbors of segments within the group are computed that is no relationships between segments from different groups are taken into account.

The user must not use this method until he has meaningful groups of segments (see more in the user manual). By default, all segments are inserted as a group.

Template Parameters

  IndexRange | a model of `ConstRange` whose value type is `std::size_t`

Parameters

  index_range | a const range of segment indices

Precondition
  index_range.size() >= 2

## ◆ operator()()

template<typename GeomTraits , typename InputRange , typename SegmentMap = CGAL::Identity_property_map<typename GeomTraits::Segment_2>>

void CGAL::Shape_regularization::Segments::Delaunay_neighbor_query_2< GeomTraits, InputRange, SegmentMap >::operator() | ( | const std::size_t | query_index,
|  | std::vector< std::size_t > & | neighbors
| ) |  | const

fills in a vector with indices of segments, which are direct neighbors of the query segment.

Parameters

  query_index | an index of the query segment
  neighbors | indices of segments, which are direct neighbors of the query segment

Precondition
  query_index >= 0 && query_index < input_range.size()