The QVector2D class represents a vector or vertex in 2D space. More...

Public Methods
	QVector2D ()

	QVector2D (const QPoint &point)

	QVector2D (const QPointF &point)

	QVector2D (const QVector3D &vector)

	QVector2D (const QVector4D &vector)

	QVector2D (qreal xpos, qreal ypos)

bool	isNull () const

qreal	length () const

qreal	lengthSquared () const

void	normalize ()

QVector2D	normalized () const

	operator QVariant () const

QVector2D &	operator*= (const QVector2D &vector)

QVector2D &	operator*= (qreal factor)

QVector2D &	operator+= (const QVector2D &vector)

QVector2D &	operator-= (const QVector2D &vector)

QVector2D &	operator/= (qreal divisor)

void	setX (qreal x)

void	setY (qreal y)

QPoint	toPoint () const

QPointF	toPointF () const

QVector3D	toVector3D () const

QVector4D	toVector4D () const

qreal	x () const

qreal	y () const

Static Public Methods
static qreal	dotProduct (const QVector2D &v1, const QVector2D &v2)

Friends
bool	operator!= (const QVector2D &v1, const QVector2D &v2)

const QVector2D	operator* (const QVector2D &v1, const QVector2D &v2)

const QVector2D	operator* (const QVector2D &vector, qreal factor)

const QVector2D	operator* (qreal factor, const QVector2D &vector)

const QVector2D	operator+ (const QVector2D &v1, const QVector2D &v2)

const QVector2D	operator- (const QVector2D &v1, const QVector2D &v2)

const QVector2D	operator- (const QVector2D &vector)

const QVector2D	operator/ (const QVector2D &vector, qreal divisor)

bool	operator== (const QVector2D &v1, const QVector2D &v2)

bool	qFuzzyCompare (const QVector2D &v1, const QVector2D &v2)

class	QVector3D

class	QVector4D

Related Functions
These are not member functions
QDataStream &	operator<< (QDataStream &stream, const QVector2D &vector)

QDataStream &	operator>> (QDataStream &stream, QVector2D &vector)

Detailed Description

The QVector2D class represents a vector or vertex in 2D space.

The QVector2D class can also be used to represent vertices in 2D space. We therefore do not need to provide a separate vertex class.

Note: By design values in the QVector2D instance are stored as float. This means that on platforms where the qreal arguments to QVector2D functions are represented by double values, it is possible to lose precision.

See also: QVector3D, QVector4D, QQuaternion

Constructor & Destructor Documentation

QVector2D::QVector2D ( )

inline

Constructs a null vector, i.e. with coordinates (0, 0, 0).

QVector2D::QVector2D	(	qreal	xpos,
		qreal	ypos
	)

inline

Constructs a vector with coordinates (xpos, ypos).

QVector2D::QVector2D ( const QPoint & point )

inlineexplicit

Constructs a vector with x and y coordinates from a 2D point.

QVector2D::QVector2D ( const QPointF & point )

inlineexplicit

Constructs a vector with x and y coordinates from a 2D point.

QVector2D::QVector2D ( const QVector3D & vector )

explicit

Constructs a vector with x and y coordinates from a 3D vector. The z coordinate of vector is dropped.

See also: toVector3D()

QVector2D::QVector2D ( const QVector4D & vector )

explicit

Constructs a vector with x and y coordinates from a 3D vector. The z and w coordinates of vector are dropped.

See also: toVector4D()

Method Documentation

qreal QVector2D::dotProduct	(	const QVector2D &	v1,
		const QVector2D &	v2
	)

static

Returns the dot product of v1 and v2.

bool QVector2D::isNull ( ) const

inline

Returns true if the x and y coordinates are set to 0.0, otherwise returns false.

qreal QVector2D::length ( ) const

Returns the length of the vector from the origin.

See also: lengthSquared(), normalized()

qreal QVector2D::lengthSquared ( ) const

Returns the squared length of the vector from the origin. This is equivalent to the dot product of the vector with itself.

See also: length(), dotProduct()

void QVector2D::normalize ( )

Normalizes the current vector in place. Nothing happens if this vector is a null vector or the length of the vector is very close to 1.

See also: length(), normalized()

QVector2D QVector2D::normalized ( ) const

Returns the normalized unit vector form of this vector.

If this vector is null, then a null vector is returned. If the length of the vector is very close to 1, then the vector will be returned as-is. Otherwise the normalized form of the vector of length 1 will be returned.

See also: length(), normalize()

QVector2D::operator QVariant ( ) const

Returns the 2D vector as a QVariant.

QVector2D & QVector2D::operator*= ( const QVector2D & vector )

inline

Multiplies the components of this vector by the corresponding components in vector.

QVector2D & QVector2D::operator*= ( qreal factor )

inline

Multiplies this vector's coordinates by the given factor, and returns a reference to this vector.

See also: operator/=()

QVector2D & QVector2D::operator+= ( const QVector2D & vector )

inline

Adds the given vector to this vector and returns a reference to this vector.

See also: operator-=()

QVector2D & QVector2D::operator-= ( const QVector2D & vector )

inline

Subtracts the given vector from this vector and returns a reference to this vector.

See also: operator+=()

QVector2D & QVector2D::operator/= ( qreal divisor )

inline

Divides this vector's coordinates by the given divisor, and returns a reference to this vector.

See also: operator*=()

void QVector2D::setX ( qreal x )

inline

Sets the x coordinate of this point to the given x coordinate.

See also: x(), setY()

void QVector2D::setY ( qreal y )

inline

Sets the y coordinate of this point to the given y coordinate.

See also: y(), setX()

QPoint QVector2D::toPoint ( ) const

inline

Returns the QPoint form of this 2D vector.

See also: toPointF(), toVector3D()

QPointF QVector2D::toPointF ( ) const

inline

Returns the QPointF form of this 2D vector.

See also: toPoint(), toVector3D()

QVector3D QVector2D::toVector3D ( ) const

Returns the 3D form of this 2D vector, with the z coordinate set to zero.

See also: toVector4D(), toPoint()

QVector4D QVector2D::toVector4D ( ) const

Returns the 4D form of this 2D vector, with the z and w coordinates set to zero.

See also: toVector3D(), toPoint()

qreal QVector2D::x ( ) const

inline

Returns the x coordinate of this point.

See also: setX(), y()

qreal QVector2D::y ( ) const

inline

Returns the y coordinate of this point.

See also: setY(), x()

Friends And Related Function Documentation

bool operator!=	(	const QVector2D &	v1,
		const QVector2D &	v2
	)

friend

Returns true if v1 is not equal to v2, otherwise returns false. This operator uses an exact floating point comparison.

const QVector2D operator*	(	const QVector2D &	v1,
		const QVector2D &	v2
	)

friend

Multiplies the components of v1 by the corresponding components in v2.

const QVector2D operator*	(	const QVector2D &	vector,
		qreal	factor
	)

friend

Returns a copy of the given vector, multiplied by the given factor.

See also: QVector2D::operator*=()

const QVector2D operator*	(	qreal	factor,
		const QVector2D &	vector
	)

friend

Returns a copy of the given vector, multiplied by the given factor.

See also: QVector2D::operator*=()

const QVector2D operator+	(	const QVector2D &	v1,
		const QVector2D &	v2
	)

friend

Returns a QVector2D object that is the sum of the given vectors, v1 and v2, each component is added separately.

See also: QVector2D::operator+=()

const QVector2D operator-	(	const QVector2D &	v1,
		const QVector2D &	v2
	)

friend

Returns a QVector2D object that is formed by subtracting v2 from v1, each component is subtracted separately.

See also: QVector2D::operator-=()

const QVector2D operator- ( const QVector2D & vector )

friend

Returns a QVector2D object that is formed by changing the sign of the components of the given vector.

Equivalent to QVector2D(0,0) - vector.

const QVector2D operator/	(	const QVector2D &	vector,
		qreal	divisor
	)

friend

Returns the QVector2D object formed by dividing all three components of the given vector by the given divisor.

See also: QVector2D::operator/=()

QDataStream & operator<<	(	QDataStream &	stream,
		const QVector2D &	vector
	)

Refer to Serializing Data Types for additional information.

bool operator==	(	const QVector2D &	v1,
		const QVector2D &	v2
	)

friend

Returns true if v1 is equal to v2, otherwise returns false. This operator uses an exact floating point comparison.

QDataStream & operator>>	(	QDataStream &	stream,
		QVector2D &	vector
	)

Refer to Serializing Data Types for additional information.

bool qFuzzyCompare	(	const QVector2D &	v1,
		const QVector2D &	v2
	)

friend

Returns true if v1 and v2 are equal, allowing for a small fuzziness factor for floating point comparisons, otherwise false.

Public Methods

Static Public Methods

Friends

Related Functions

Detailed Description

Constructor & Destructor Documentation

Method Documentation

Friends And Related Function Documentation