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QVector4D Class Reference
[QtGui module]

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

Methods

Static Methods

Special Methods


Detailed Description

This class can be pickled.

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

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

Note: By design values in the QVector4D instance are stored as float. This means that on platforms where the qreal arguments to QVector4D functions are represented by double values, it is possible to lose precision.


Method Documentation

QVector4D.__init__ (self)

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

QVector4D.__init__ (self, float xpos, float ypos, float zpos, float wpos)

Constructs a vector with coordinates (xpos, ypos, zpos, wpos).

QVector4D.__init__ (self, QPoint point)

Constructs a vector with x and y coordinates from a 2D point, and z and w coordinates of 0.

QVector4D.__init__ (self, QPointF point)

Constructs a vector with x and y coordinates from a 2D point, and z and w coordinates of 0.

QVector4D.__init__ (self, QVector2D vector)

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

See also toVector2D().

QVector4D.__init__ (self, 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.__init__ (self, QVector3D vector)

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

See also toVector3D().

QVector4D.__init__ (self, QVector3D vector, float wpos)

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

See also toVector3D().

QVector4D.__init__ (self, QVector4D)

float QVector4D.dotProduct (QVector4D v1, QVector4D v2)

Returns the dot product of v1 and v2.

bool QVector4D.isNull (self)

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

float QVector4D.length (self)

Returns the length of the vector from the origin.

See also lengthSquared() and normalized().

float QVector4D.lengthSquared (self)

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().

QVector4D.normalize (self)

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 (self)

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().

QVector4D.setW (self, float aW)

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

See also w(), setX(), setY(), and setZ().

QVector4D.setX (self, float aX)

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

See also x(), setY(), setZ(), and setW().

QVector4D.setY (self, float aY)

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

See also y(), setX(), setZ(), and setW().

QVector4D.setZ (self, float aZ)

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

See also z(), setX(), setY(), and setW().

QPoint QVector4D.toPoint (self)

Returns the QPoint form of this 4D vector. The z and w coordinates are dropped.

See also toPointF() and toVector2D().

QPointF QVector4D.toPointF (self)

Returns the QPointF form of this 4D vector. The z and w coordinates are dropped.

See also toPoint() and toVector2D().

QVector2D QVector4D.toVector2D (self)

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

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

QVector2D QVector4D.toVector2DAffine (self)

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 (self)

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

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

QVector3D QVector4D.toVector3DAffine (self)

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().

float QVector4D.w (self)

Returns the w coordinate of this point.

See also setW(), x(), y(), and z().

float QVector4D.x (self)

Returns the x coordinate of this point.

See also setX(), y(), z(), and w().

float QVector4D.y (self)

Returns the y coordinate of this point.

See also setY(), x(), z(), and w().

float QVector4D.z (self)

Returns the z coordinate of this point.

See also setZ(), x(), y(), and w().

QVector4D QVector4D.__add__ (self, QVector4D v2)

QVector4D QVector4D.__div__ (self, float divisor)

bool QVector4D.__eq__ (self, QVector4D v2)

QVector4D QVector4D.__iadd__ (self, QVector4D vector)

QVector4D QVector4D.__idiv__ (self, float divisor)

QVector4D QVector4D.__imul__ (self, float factor)

QVector4D QVector4D.__imul__ (self, QVector4D vector)

QVector4D QVector4D.__isub__ (self, QVector4D vector)

QVector4D QVector4D.__mul__ (self, QMatrix4x4 matrix)

QVector4D QVector4D.__mul__ (self, QVector4D vector)

QVector4D QVector4D.__mul__ (self, float factor)

QVector4D QVector4D.__mul__ (self, QVector4D v2)

bool QVector4D.__ne__ (self, QVector4D v2)

QVector4D QVector4D.__neg__ (self)

object QVector4D.__repr__ (self)

QVector4D QVector4D.__sub__ (self, QVector4D v2)


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