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QVector2D Class Reference
[QtGui module]

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

Methods

Static Methods

Special Methods


Detailed Description

This class can be pickled.

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.


Method Documentation

QVector2D.__init__ (self)

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

QVector2D.__init__ (self, float xpos, float ypos)

Constructs a vector with coordinates (xpos, ypos).

QVector2D.__init__ (self, QPoint point)

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

QVector2D.__init__ (self, QPointF point)

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

QVector2D.__init__ (self, QVector3D vector)

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

See also toVector3D().

QVector2D.__init__ (self, QVector4D vector)

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

See also toVector4D().

QVector2D.__init__ (self, QVector2D)

float QVector2D.dotProduct (QVector2D v1, QVector2D v2)

Returns the dot product of v1 and v2.

bool QVector2D.isNull (self)

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

float QVector2D.length (self)

Returns the length of the vector from the origin.

See also lengthSquared() and normalized().

float QVector2D.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().

QVector2D.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().

QVector2D QVector2D.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().

QVector2D.setX (self, float aX)

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

See also x() and setY().

QVector2D.setY (self, float aY)

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

See also y() and setX().

QPoint QVector2D.toPoint (self)

Returns the QPoint form of this 2D vector.

See also toPointF() and toVector3D().

QPointF QVector2D.toPointF (self)

Returns the QPointF form of this 2D vector.

See also toPoint() and toVector3D().

QVector3D QVector2D.toVector3D (self)

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

See also toVector4D() and toPoint().

QVector4D QVector2D.toVector4D (self)

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

See also toVector3D() and toPoint().

float QVector2D.x (self)

Returns the x coordinate of this point.

See also setX() and y().

float QVector2D.y (self)

Returns the y coordinate of this point.

See also setY() and x().

QVector2D QVector2D.__add__ (self, QVector2D v2)

QVector2D QVector2D.__div__ (self, float divisor)

bool QVector2D.__eq__ (self, QVector2D v2)

QVector2D QVector2D.__iadd__ (self, QVector2D vector)

QVector2D QVector2D.__idiv__ (self, float divisor)

QVector2D QVector2D.__imul__ (self, float factor)

QVector2D QVector2D.__imul__ (self, QVector2D vector)

QVector2D QVector2D.__isub__ (self, QVector2D vector)

QVector2D QVector2D.__mul__ (self, QVector2D vector)

QVector2D QVector2D.__mul__ (self, float factor)

QVector2D QVector2D.__mul__ (self, QVector2D v2)

bool QVector2D.__ne__ (self, QVector2D v2)

QVector2D QVector2D.__neg__ (self)

object QVector2D.__repr__ (self)

QVector2D QVector2D.__sub__ (self, QVector2D v2)


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