Shapes::CAabb2D Class Reference

2D Axially Aligned Bounding Box. More...

#include <AABB.h>

Public Member Functions
	CAabb2D (const Vector2 &, const Vector2 &)
	Constructor.
	CAabb2D ()
	Default constructor.
void	Translate (const Vector2 &)
	Translate AABB.
CAabb2D &	operator= (const Vector2 &)
	Set AABB to point.
CAabb2D &	operator+= (const Vector2 &)
	Add point to AABB.
const float	GetWidth () const
	Get width of AABB.
const float	GetHt () const
	Get height of AABB.
const Vector2 &	GetTopLeft () const
	Get top left corner.
const Vector2 &	GetBottomRt () const
	Get bottom right corner.
UINT	GetAndResetTestCount ()
	Get and reset number of intersection tests.

Private Attributes
Vector2	m_vTopLeft
	Top left point.
Vector2	m_vBottomRt
	Bottom right point.

Static Private Attributes
static UINT	m_nTestCount = 0LLU
	Number of AABB to AABB intersection tests.

Friends
bool	operator&& (const CAabb2D &, const CAabb2D &)
	AABB intersection test.
bool	operator&& (const CAabb2D &, const Vector2 &)
	AABB intersection test.

Detailed Description

An AABB, or Axially Aligned Bounding Box, is a rectangle with axes aligned with the cardinal axes.

Constructor & Destructor Documentation

CAabb2D() [1/2]

CAabb2D::CAabb2D	(	const Vector2 &	tl,
		const Vector2 &	br )

This constructor creates an AABB given its top left and bottom right corners. No effort is made to check whether the top left corner is actually above and to the left of the bottom right corner, so beware.

Parameters

tl	Top left corner.
br	Bottom right corner.

CAabb2D() [2/2]

CAabb2D::CAabb2D

(

)

The default constructor creates an AABB whose top left and bottom right corners are the origin.

Member Function Documentation

GetAndResetTestCount()

UINT CAabb2D::GetAndResetTestCount

(

)

Get the number of AABB to AABB intersection tests made since the last time this function was called, and reset it to zero.

Returns

Number of tests since last call.

GetBottomRt()

const Vector2 & CAabb2D::GetBottomRt

(

)

const

Reader function for the bottom right corner.

Returns

The bottom right corner.

GetHt()

const float CAabb2D::GetHt

(

)

const

Reader function for the height.

Returns

AABB height.

GetTopLeft()

const Vector2 & CAabb2D::GetTopLeft

(

)

const

Reader function for the top left corner.

Returns

The top left corner.

GetWidth()

const float CAabb2D::GetWidth

(

)

const

Reader function for the width.

Returns

AABB width.

operator+=()

CAabb2D & CAabb2D::operator+=

(

const Vector2 &

p

)

Overloaded += operator that adds a point to an AABB, that is, it extends the AABB to cover the new point in addition to its existing area.

Parameters

p

A point.

Returns

AABB consisting of old AABB extended to cover p.

operator=()

CAabb2D & CAabb2D::operator=

(

const Vector2 &

p

)

Overloaded assignment operator that sets an AABB to a single point.

Parameters

p

A point.

Returns

AABB for the point.

Translate()

void CAabb2D::Translate

(

const Vector2 &

p

)

Translate AABB to a new position. Adds the displacement vector to the top left and bottom right corners of the AABB.

Parameters

p	Vector displacement.

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