Ogre::Vector2 Class Reference

Standard 2-dimensional vector. More...

#include <OgreVector2.h>

Public Member Functions
	Vector2 ()
	Default constructor.
	Vector2 (const int afCoordinate[2])
	Vector2 (const Real afCoordinate[2])
	Vector2 (const Real fX, const Real fY)
	Vector2 (const Real scaler)
	Vector2 (Real *const r)
Ogre::Radian	angleBetween (const Ogre::Vector2 &other) const
	Gets the angle between 2 vectors.
Ogre::Radian	angleTo (const Ogre::Vector2 &other) const
	Gets the oriented angle between 2 vectors.
Real	crossProduct (const Vector2 &rkVector) const
	Calculates the 2 dimensional cross-product of 2 vectors, which results in a single floating point value which is 2 times the area of the triangle.
Real	distance (const Vector2 &rhs) const
	Returns the distance to another vector.
Real	dotProduct (const Vector2 &vec) const
	Calculates the dot (scalar) product of this vector with another.
bool	isNaN () const
	Check whether this vector contains valid values.
bool	isZeroLength () const
	Returns true if this vector is zero length.
Real	length () const
	Returns the length (magnitude) of the vector.
void	makeCeil (const Vector2 &cmp)
	Sets this vector's components to the maximum of its own and the ones of the passed in vector.
void	makeFloor (const Vector2 &cmp)
	Sets this vector's components to the minimum of its own and the ones of the passed in vector.
Vector2	midPoint (const Vector2 &vec) const
	Returns a vector at a point half way between this and the passed in vector.
Real	normalise ()
	Normalises the vector.
Vector2	normalisedCopy () const
	As normalise, except that this vector is unaffected and the normalised vector is returned as a copy.
bool	operator!= (const Vector2 &rkVector) const
Vector2	operator* (const Real fScalar) const
Vector2	operator* (const Vector2 &rhs) const
Vector2 &	operator*= (const Real fScalar)
Vector2 &	operator*= (const Vector2 &rkVector)
const Vector2 &	operator+ () const
Vector2	operator+ (const Vector2 &rkVector) const
Vector2 &	operator+= (const Real fScaler)
Vector2 &	operator+= (const Vector2 &rkVector)
Vector2	operator- () const
Vector2	operator- (const Vector2 &rkVector) const
Vector2 &	operator-= (const Real fScaler)
Vector2 &	operator-= (const Vector2 &rkVector)
Vector2	operator/ (const Real fScalar) const
Vector2	operator/ (const Vector2 &rhs) const
Vector2 &	operator/= (const Real fScalar)
Vector2 &	operator/= (const Vector2 &rkVector)
bool	operator< (const Vector2 &rhs) const
	Returns true if the vector's scalar components are all greater that the ones of the vector it is compared against.
Vector2 &	operator= (const Real fScalar)
bool	operator== (const Vector2 &rkVector) const
bool	operator> (const Vector2 &rhs) const
	Returns true if the vector's scalar components are all smaller that the ones of the vector it is compared against.
Real &	operator[] (const size_t i)
Real	operator[] (const size_t i) const
Vector2	perpendicular () const
	Generates a vector perpendicular to this vector (eg an 'up' vector).
Real *	ptr ()
	Pointer accessor for direct copying.
const Real *	ptr () const
	Pointer accessor for direct copying.
Vector2	randomDeviant (Radian angle) const
	Generates a new random vector which deviates from this vector by a given angle in a random direction.
Vector2	reflect (const Vector2 &normal) const
	Calculates a reflection vector to the plane with the given normal .
Real	squaredDistance (const Vector2 &rhs) const
	Returns the square of the distance to another vector.
Real	squaredLength () const
	Returns the square of the length(magnitude) of the vector.
void	swap (Vector2 &other)
	Exchange the contents of this vector with another.

Public Attributes
Real	x
Real	y

Static Public Attributes
static const Vector2	NEGATIVE_UNIT_X
static const Vector2	NEGATIVE_UNIT_Y
static const Vector2	UNIT_SCALE
static const Vector2	UNIT_X
static const Vector2	UNIT_Y
static const Vector2	ZERO

Detailed Description

Standard 2-dimensional vector.

Remarks

A direction in 2D space represented as distances along the 2 orthogonal axes (x, y). Note that positions, directions and scaling factors can be represented by a vector, depending on how you interpret the values.

Constructor & Destructor Documentation

Vector2() [1/6]

Ogre::Vector2::Vector2 ( )

inline

Default constructor.

Note

It does NOT initialize the vector for efficiency.

Vector2() [2/6]

Ogre::Vector2::Vector2 ( const Real  fX, const Real  fY  )

inline

Vector2() [3/6]

Ogre::Vector2::Vector2 ( const Real  scaler )

inlineexplicit

Vector2() [4/6]

Ogre::Vector2::Vector2 ( const Real  afCoordinate[2] )

inlineexplicit

Vector2() [5/6]

Ogre::Vector2::Vector2 ( const int  afCoordinate[2] )

inlineexplicit

Vector2() [6/6]

Ogre::Vector2::Vector2 ( Real *const  r )

inlineexplicit

Member Function Documentation

angleBetween()

Ogre::Radian Ogre::Vector2::angleBetween ( const Ogre::Vector2 &  other ) const

inline

Gets the angle between 2 vectors.

Remarks

Vectors do not have to be unit-length but must represent directions.

References Ogre::Math::ACos(), Ogre::Math::Clamp(), and length().

angleTo()

Ogre::Radian Ogre::Vector2::angleTo ( const Ogre::Vector2 &  other ) const

inline

Gets the oriented angle between 2 vectors.

Remarks

Vectors do not have to be unit-length but must represent directions. The angle is comprised between 0 and 2 PI.

References Ogre::Math::TWO_PI.

crossProduct()

Real Ogre::Vector2::crossProduct ( const Vector2 &  rkVector ) const

inline

Calculates the 2 dimensional cross-product of 2 vectors, which results in a single floating point value which is 2 times the area of the triangle.

References x, and y.

distance()

Real Ogre::Vector2::distance ( const Vector2 &  rhs ) const

inline

Returns the distance to another vector.

Warning

This operation requires a square root and is expensive in terms of CPU operations. If you don't need to know the exact distance (e.g. for just comparing distances) use squaredDistance() instead.

dotProduct()

Real Ogre::Vector2::dotProduct ( const Vector2 &  vec ) const

inline

Calculates the dot (scalar) product of this vector with another.

Remarks

The dot product can be used to calculate the angle between 2 vectors. If both are unit vectors, the dot product is the cosine of the angle; otherwise the dot product must be divided by the product of the lengths of both vectors to get the cosine of the angle. This result can further be used to calculate the distance of a point from a plane.

Parameters

vec	Vector with which to calculate the dot product (together with this one).

Returns

A float representing the dot product value.

References x, and y.

isNaN()

bool Ogre::Vector2::isNaN ( ) const

inline

Check whether this vector contains valid values.

isZeroLength()

bool Ogre::Vector2::isZeroLength ( ) const

inline

Returns true if this vector is zero length.

length()

Real Ogre::Vector2::length ( ) const

inline

Returns the length (magnitude) of the vector.

Warning

This operation requires a square root and is expensive in terms of CPU operations. If you don't need to know the exact length (e.g. for just comparing lengths) use squaredLength() instead.

Referenced by angleBetween().

makeCeil()

void Ogre::Vector2::makeCeil ( const Vector2 &  cmp )

inline

Sets this vector's components to the maximum of its own and the ones of the passed in vector.

Remarks

'Maximum' in this case means the combination of the highest value of x, y and z from both vectors. Highest is taken just numerically, not magnitude, so 1 > -3.

References x, and y.

makeFloor()

void Ogre::Vector2::makeFloor ( const Vector2 &  cmp )

inline

Sets this vector's components to the minimum of its own and the ones of the passed in vector.

Remarks

'Minimum' in this case means the combination of the lowest value of x, y and z from both vectors. Lowest is taken just numerically, not magnitude, so -1 < 0.

References x, and y.

midPoint()

Vector2 Ogre::Vector2::midPoint ( const Vector2 &  vec ) const

inline

Returns a vector at a point half way between this and the passed in vector.

References x, and y.

normalise()

Real Ogre::Vector2::normalise ( )

inline

Normalises the vector.

Remarks

This method normalises the vector such that it's length / magnitude is 1. The result is called a unit vector.

Note

This function will not crash for zero-sized vectors, but there will be no changes made to their components.

Returns

The previous length of the vector.

Referenced by normalisedCopy().

normalisedCopy()

Vector2 Ogre::Vector2::normalisedCopy ( ) const

inline

As normalise, except that this vector is unaffected and the normalised vector is returned as a copy.

References normalise().

operator!=()

bool Ogre::Vector2::operator!= ( const Vector2 &  rkVector ) const

inline

References x, and y.

operator*() [1/2]

Vector2 Ogre::Vector2::operator* ( const Real  fScalar ) const

inline

operator*() [2/2]

Vector2 Ogre::Vector2::operator* ( const Vector2 &  rhs ) const

inline

References x, and y.

operator*=() [1/2]

Vector2 & Ogre::Vector2::operator*= ( const Real  fScalar )

inline

operator*=() [2/2]

Vector2 & Ogre::Vector2::operator*= ( const Vector2 &  rkVector )

inline

References x, and y.

operator+() [1/2]

const Vector2 & Ogre::Vector2::operator+ ( ) const

inline

operator+() [2/2]

Vector2 Ogre::Vector2::operator+ ( const Vector2 &  rkVector ) const

inline

References x, and y.

operator+=() [1/2]

Vector2 & Ogre::Vector2::operator+= ( const Real  fScaler )

inline

operator+=() [2/2]

Vector2 & Ogre::Vector2::operator+= ( const Vector2 &  rkVector )

inline

References x, and y.

operator-() [1/2]

Vector2 Ogre::Vector2::operator- ( ) const

inline

operator-() [2/2]

Vector2 Ogre::Vector2::operator- ( const Vector2 &  rkVector ) const

inline

References x, and y.

operator-=() [1/2]

Vector2 & Ogre::Vector2::operator-= ( const Real  fScaler )

inline

operator-=() [2/2]

Vector2 & Ogre::Vector2::operator-= ( const Vector2 &  rkVector )

inline

References x, and y.

operator/() [1/2]

Vector2 Ogre::Vector2::operator/ ( const Real  fScalar ) const

inline

operator/() [2/2]

Vector2 Ogre::Vector2::operator/ ( const Vector2 &  rhs ) const

inline

References x, and y.

operator/=() [1/2]

Vector2 & Ogre::Vector2::operator/= ( const Real  fScalar )

inline

operator/=() [2/2]

Vector2 & Ogre::Vector2::operator/= ( const Vector2 &  rkVector )

inline

References x, and y.

operator<()

bool Ogre::Vector2::operator< ( const Vector2 &  rhs ) const

inline

Returns true if the vector's scalar components are all greater that the ones of the vector it is compared against.

References x, and y.

operator=()

Vector2 & Ogre::Vector2::operator= ( const Real  fScalar )

inline

operator==()

bool Ogre::Vector2::operator== ( const Vector2 &  rkVector ) const

inline

References x, and y.

operator>()

bool Ogre::Vector2::operator> ( const Vector2 &  rhs ) const

inline

Returns true if the vector's scalar components are all smaller that the ones of the vector it is compared against.

References x, and y.

operator[]() [1/2]

Real & Ogre::Vector2::operator[] ( const size_t  i )

inline

operator[]() [2/2]

Real Ogre::Vector2::operator[] ( const size_t  i ) const

inline

perpendicular()

Vector2 Ogre::Vector2::perpendicular ( ) const

inline

Generates a vector perpendicular to this vector (eg an 'up' vector).

Remarks

This method will return a vector which is perpendicular to this vector. There are an infinite number of possibilities but this method will guarantee to generate one of them. If you need more control you should use the Quaternion class.

ptr() [1/2]

Real * Ogre::Vector2::ptr ( )

inline

Pointer accessor for direct copying.

ptr() [2/2]

const Real * Ogre::Vector2::ptr ( ) const

inline

Pointer accessor for direct copying.

randomDeviant()

Vector2 Ogre::Vector2::randomDeviant ( Radian  angle ) const

inline

Generates a new random vector which deviates from this vector by a given angle in a random direction.

Remarks

This method assumes that the random number generator has already been seeded appropriately.

Parameters

angle

The angle at which to deviate in radians

Returns

A random vector which deviates from this vector by angle. This vector will not be normalised, normalise it if you wish afterwards.

reflect()

Vector2 Ogre::Vector2::reflect ( const Vector2 &  normal ) const

inline

Calculates a reflection vector to the plane with the given normal .

Remarks

NB assumes 'this' is pointing AWAY FROM the plane, invert if it is not.

squaredDistance()

Real Ogre::Vector2::squaredDistance ( const Vector2 &  rhs ) const

inline

Returns the square of the distance to another vector.

Remarks

This method is for efficiency - calculating the actual distance to another vector requires a square root, which is expensive in terms of the operations required. This method returns the square of the distance to another vector, i.e. the same as the distance but before the square root is taken. Use this if you want to find the longest / shortest distance without incurring the square root.

squaredLength()

Real Ogre::Vector2::squaredLength ( ) const

inline

Returns the square of the length(magnitude) of the vector.

Remarks

This method is for efficiency - calculating the actual length of a vector requires a square root, which is expensive in terms of the operations required. This method returns the square of the length of the vector, i.e. the same as the length but before the square root is taken. Use this if you want to find the longest / shortest vector without incurring the square root.

swap()

void Ogre::Vector2::swap ( Vector2 &  other )

inline

Exchange the contents of this vector with another.

References std::swap(), x, and y.

Member Data Documentation

NEGATIVE_UNIT_X

const Vector2 Ogre::Vector2::NEGATIVE_UNIT_X

static

NEGATIVE_UNIT_Y

const Vector2 Ogre::Vector2::NEGATIVE_UNIT_Y

static

UNIT_SCALE

const Vector2 Ogre::Vector2::UNIT_SCALE

static

UNIT_X

const Vector2 Ogre::Vector2::UNIT_X

static

UNIT_Y

const Vector2 Ogre::Vector2::UNIT_Y

static

x

Real Ogre::Vector2::x

Referenced by crossProduct(), dotProduct(), makeCeil(), makeFloor(), midPoint(), operator!=(), operator*(), operator*=(), operator+(), operator+=(), operator-(), operator-=(), operator/(), operator/=(), operator<(), operator==(), operator>(), and swap().

y

Real Ogre::Vector2::y

Referenced by crossProduct(), dotProduct(), makeCeil(), makeFloor(), midPoint(), operator!=(), operator*(), operator*=(), operator+(), operator+=(), operator-(), operator-=(), operator/(), operator/=(), operator<(), operator==(), operator>(), and swap().

ZERO

const Vector2 Ogre::Vector2::ZERO

static

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The documentation for this class was generated from the following file:

• OgreVector2.h