QVector4D Class

The QVector4D class represents a vector or vertex in 4D space. More...

Header: #include <QVector4D>
qmake: QT += gui
Since: Qt 4.6

This class was introduced in Qt 4.6.

Public Functions

QVector4D(const QVector3D &vector, float wpos)
QVector4D(const QVector3D &vector)
QVector4D(const QVector2D &vector, float zpos, float wpos)
QVector4D(const QVector2D &vector)
float length() const
float lengthSquared() const
void normalize()
QVector4D normalized() const
QVector2D toVector2D() const
QVector2D toVector2DAffine() const
QVector3D toVector3D() const
QVector3D toVector3DAffine() const
QVariant operator QVariant() const

Static Public Members

float dotProduct(const QVector4D &v1, const QVector4D &v2)

Detailed Description

The QVector4D class can also be used to represent vertices in 4D space. We therefore do not need to provide a separate vertex class.

See also QQuaternion, QVector2D, and QVector3D.

Member Function Documentation

QVector4D::QVector4D(const QVector3D &vector, float wpos)

Constructs a 4D vector from the specified 3D vector. The w coordinate is set to wpos.

See also toVector3D().

QVector4D::QVector4D(const QVector3D &vector)

Constructs a 4D vector from the specified 3D vector. The w coordinate is set to zero.

See also toVector3D().

QVector4D::QVector4D(const QVector2D &vector, float zpos, float wpos)

Constructs a 4D vector from the specified 2D vector. The z and w coordinates are set to zpos and wpos respectively.

See also toVector2D().

QVector4D::QVector4D(const QVector2D &vector)

Constructs a 4D vector from the specified 2D vector. The z and w coordinates are set to zero.

See also toVector2D().

[static] float QVector4D::dotProduct(const QVector4D &v1, const QVector4D &v2)

Returns the dot product of v1 and v2.

float QVector4D::length() const

Returns the length of the vector from the origin.

See also lengthSquared() and normalized().

float QVector4D::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() and dotProduct().

void QVector4D::normalize()

Normalizes the currect 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() and normalized().

QVector4D QVector4D::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() and normalize().

QVector2D QVector4D::toVector2D() const

Returns the 2D vector form of this 4D vector, dropping the z and w coordinates.

See also toVector2DAffine(), toVector3D(), and toPoint().

QVector2D QVector4D::toVector2DAffine() const

Returns the 2D vector form of this 4D vector, dividing the x and y coordinates by the w coordinate and dropping the z coordinate. Returns a null vector if w is zero.

See also toVector2D(), toVector3DAffine(), and toPoint().

QVector3D QVector4D::toVector3D() const

Returns the 3D vector form of this 4D vector, dropping the w coordinate.

See also toVector3DAffine(), toVector2D(), and toPoint().

QVector3D QVector4D::toVector3DAffine() const

Returns the 3D vector form of this 4D vector, dividing the x, y, and z coordinates by the w coordinate. Returns a null vector if w is zero.

See also toVector3D(), toVector2DAffine(), and toPoint().

QVariant QVector4D::operator QVariant() const

Returns the 4D vector as a QVariant.