Box< T > Class Template Reference

Detailed Description

template<typename T>
class lemon::dim2::Box< T >

A class to calculate or store the bounding box of plain vectors (points).

#include <lemon/dim2.h>

Public Member Functions
	Box ()
	Default constructor: creates an empty box.
	Box (Point< T > a)
	Construct a box from one point.
	Box (Point< T > a, Point< T > b)
	Construct a box from two points.
	Box (T l, T b, T r, T t)
	Construct a box from four numbers.
bool	empty () const
	Return true if the box is empty.
void	clear ()
	Make the box empty.
Point< T >	bottomLeft () const
	Give back the bottom left corner of the box.
void	bottomLeft (Point< T > p)
	Set the bottom left corner of the box.
Point< T >	topRight () const
	Give back the top right corner of the box.
void	topRight (Point< T > p)
	Set the top right corner of the box.
Point< T >	bottomRight () const
	Give back the bottom right corner of the box.
void	bottomRight (Point< T > p)
	Set the bottom right corner of the box.
Point< T >	topLeft () const
	Give back the top left corner of the box.
void	topLeft (Point< T > p)
	Set the top left corner of the box.
T	bottom () const
	Give back the bottom of the box.
void	bottom (T t)
	Set the bottom of the box.
T	top () const
	Give back the top of the box.
void	top (T t)
	Set the top of the box.
T	left () const
	Give back the left side of the box.
void	left (T t)
	Set the left side of the box.
T	right () const
	Give back the right side of the box.
void	right (T t)
	Set the right side of the box.
T	height () const
	Give back the height of the box.
T	width () const
	Give back the width of the box.
bool	inside (const Point< T > &u) const
	Checks whether a point is inside the box.
Box &	add (const Point< T > &u)
Box &	add (const Box &u)
Box	operator& (const Box &u) const

Related Functions
(Note that these are not member functions.)
template<typename T >
std::istream &	operator>> (std::istream &is, Box< T > &b)
template<typename T >
std::ostream &	operator<< (std::ostream &os, const Box< T > &b)

Constructor & Destructor Documentation

Box ( Point< T >  a, Point< T >  b  )

inline

Construct a box from two points.

Parameters

a	The bottom left corner.
b	The top right corner.

Warning

The coordinates of the bottom left corner must be no more than those of the top right one.

Box ( T  l, T  b, T  r, T  t  )

inline

Construct a box from four numbers.

Parameters

l	The left side of the box.
b	The bottom of the box.
r	The right side of the box.
t	The top of the box.

Warning

The left side must be no more than the right side and bottom must be no more than the top.

Member Function Documentation

bool empty ( ) const

inline

Return true if the box is empty (i.e. return false if at least one point was added to the box or the coordinates of the box were set).

The coordinates of an empty box are not defined.

Point<T> bottomLeft ( ) const

inline

Give back the bottom left corner of the box. If the box is empty, then the return value is not defined.

void bottomLeft ( Point< T >  p )

inline

Set the bottom left corner of the box.

Precondition

The box must not be empty.

Point<T> topRight ( ) const

inline

Give back the top right corner of the box. If the box is empty, then the return value is not defined.

void topRight ( Point< T >  p )

inline

Set the top right corner of the box.

Precondition

The box must not be empty.

Point<T> bottomRight ( ) const

inline

Give back the bottom right corner of the box. If the box is empty, then the return value is not defined.

void bottomRight ( Point< T >  p )

inline

Set the bottom right corner of the box.

Precondition

The box must not be empty.

Point<T> topLeft ( ) const

inline

Give back the top left corner of the box. If the box is empty, then the return value is not defined.

void topLeft ( Point< T >  p )

inline

Set the top left corner of the box.

Precondition

The box must not be empty.

T bottom ( ) const

inline

Give back the bottom of the box. If the box is empty, then the return value is not defined.

void bottom ( T  t )

inline

Set the bottom of the box.

Precondition

The box must not be empty.

T top ( ) const

inline

Give back the top of the box. If the box is empty, then the return value is not defined.

void top ( T  t )

inline

Set the top of the box.

Precondition

The box must not be empty.

T left ( ) const

inline

Give back the left side of the box. If the box is empty, then the return value is not defined.

void left ( T  t )

inline

Set the left side of the box.

Precondition

The box must not be empty.

T right ( ) const

inline

Give back the right side of the box. If the box is empty, then the return value is not defined.

void right ( T  t )

inline

Set the right side of the box.

Precondition

The box must not be empty.

T height ( ) const

inline

Give back the height of the box. If the box is empty, then the return value is not defined.

T width ( ) const

inline

Give back the width of the box. If the box is empty, then the return value is not defined.

Box& add ( const Point< T > &  u )

inline

Increments the box with a point.

Box& add ( const Box< T > &  u )

inline

Increments the box to contain another box.

Box operator& ( const Box< T > &  u ) const

inline

Intersection of two boxes.