CGAL 6.1 - dD Spatial Searching

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CGAL::Point_container< Traits > Class Template Reference
Reference Manual » Advanced Classes

`#include <CGAL/Point_container.h>`

## Definition

template<typename Traits>
class CGAL::Point_container< Traits >

A custom container for points used to build a tree.

Each point container holds the points from a rectangle associated with a node of the tree. In the remainder of this reference page this rectangle is called the associated rectangle. Provides a method to split a container and a number of methods to support the implementation of splitting rules.

Template Parameters

  Traits | must be model of the concept `SearchTraits`.

See also
  `SearchTraits`
  `SpatialSeparator`

## Related Functions
(Note that these are not member functions.)
template<class Traits >
std::ostream & | operator<< (std::ostream &s, Point_container< Traits > c)
| Prints the point container `c` to the output stream `s` and returns `s`.

## Types
typedef Traits::FT | FT
| Number type.
typedef Traits::Point_d | Point_d
| Point type.
typedef unspecified_type | iterator
| An iterator with value type `Point_d*`.
typedef unspecified_type | const_iterator
| A const iterator with value type `const Point_d*`.

## Creation
| Point_container (int d)
| Construct an empty container for storing `d`-dimensional points.
template<class InputIterator >
| Point_container (int d, InputIterator begin, InputIterator end)
| Construct the container of `d`-dimensional points of type `Point_d` given by the iterator sequence `[begin, end)`.

## Operations
template<class SpatialSeparator >
void | split (Point_container< Traits > &c2, SpatialSeparator sep, bool sliding=false)
| Given an empty container `c2` with the same dimension as `c`, splits `c` into `c`and `c2` using the separator `sep`.
void | swap (Point_container< Traits > &c2)
| Swap the contents of `c` and `c2`
void | recompute_tight_bounding_box ()
| Recompute the bounding box of the points in the container.
iterator | begin ()
| Returns an iterator to a pointer to the first point.
iterator | end ()
| Returns the appropriate past-the-end iterator.
const_iterator | begin () const
| Returns a const iterator to a pointer to the first point.
const_iterator | end () const
| Returns the appropriate past-the-end const iterator.
int | dimension () const
| Returns the dimension.
int | built_coordinate () const
| Returns coordinate for which the pointer list is built.
int | max_span_coord () const
| Returns coordinate where the associated rectangle has maximal span.
int | max_tight_span_coord () const
| Returns coordinate where the point coordinates have maximal span.
FT | max_span_lower () const
| Returns lower value of the interval corresponding to `max_span_coord()`.
FT | max_tight_span_lower () const
| Returns lower value of the interval corresponding to `max_tight_span_coord()`.
FT | max_span_upper () const
| Returns upper value of the interval corresponding to `max_span_coord()`.
FT | max_span_upper_without_dim (int d) const
| Returns upper value of the interval over all dimensions without taking dimension `d` into account.
FT | max_tight_span_upper () const
| Returns upper value of the interval corresponding to `max_tight_span_coord()`.
FT | max_spread () const
| Returns the size of the interval corresponding to `max_span_coord()`.
FT | max_tight_spread () const
| Returns the size of the interval corresponding to `max_tight_span_coord()`.
FT | median (int split_coord) const
| Returns the median value of the points stored in the container for dimension `split_coord`.
const Kd_tree_rectangle< Traits > & | bounding_box () const
| Returns the associated rectangle.
const Kd_tree_rectangle< Traits > & | tight_bounding_box ()
| Returns the bounding box of the items in associated rectangle.
int | max_tight_span_coord_balanced (FT aspect_ratio) const
| Returns the dimension with the maximal point spread, for which after fair splitting the ratio of the length of the longest side and the smallest side of the bounding box of the items in associated rectangle, does not exceed `aspect_ratio`.
FT | balanced_fair (int d, FT aspect_ratio)
| Returns the splitting value for fair splitting.
FT | balanced_sliding_fair (int d, FT aspect_ratio)
| Returns the splitting value for sliding fair splitting.
std::size_t | size () const
| Returns the number of points stored.
bool | empty () const
| Returns true if no points are present, false otherwise.

## Member Function Documentation

## ◆ max_tight_span_lower()

template<typename Traits >

FT CGAL::Point_container< Traits >::max_tight_span_lower | ( |  | ) | const

Returns lower value of the interval corresponding to `max_tight_span_coord()`.

That is, the smallest `max_tight_span_coord()`-th coordinate of the points in `c`.

## ◆ split()

template<typename Traits >
template<class SpatialSeparator >

void CGAL::Point_container< Traits >::split | ( | Point_container< Traits > & | c2,
|  | SpatialSeparator | sep,
|  | bool | sliding = `false`
| ) |  |

Given an empty container `c2` with the same dimension as `c`, splits `c` into `c`and `c2` using the separator `sep`.

If sliding is `true` after splitting each container contains at least one point. Container `c` should contain at least two points.