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QVector4D Class Reference

^{[ QtGui module]}

QVector4D 类表示 4D 空间中的向量或顶点。 更多...

方法

• __init__ ( self )
• __init__ ( self , float  xpos , float  ypos , float  zpos , float  wpos )
• __init__ ( self , QPoint  point )
• __init__ ( self , QPointF  point )
• __init__ ( self , QVector2D  vector )
• __init__ ( self , QVector2D  vector , float  zpos , float  wpos )
• __init__ ( self , QVector3D  vector )
• __init__ ( self , QVector3D  vector , float  wpos )
• __init__ ( self , QVector4D)
• bool isNull ( self )
• float length ( self )
• float lengthSquared ( self )
• normalize ( self )
• QVector4D normalized ( self )
• setW ( self , float  aW )
• setX ( self , float  aX )
• setY ( self , float  aY )
• setZ ( self , float  aZ )
• QPoint toPoint ( self )
• QPointF toPointF ( self )
• QVector2D toVector2D ( self )
• QVector2D toVector2DAffine ( self )
• QVector3D toVector3D ( self )
• QVector3D toVector3DAffine ( self )
• float w ( self )
• float x ( self )
• float y ( self )
• float z ( self )

Static Methods

• float dotProduct (QVector4D  v1 , QVector4D  v2 )

Special Methods

• QVector4D __add__ ( self , QVector4D  v2 )
• QVector4D __div__ ( self , float  divisor )
• bool __eq__ ( self , QVector4D  v2 )
• QVector4D __iadd__ ( self , QVector4D  vector )
• QVector4D __idiv__ ( self , float  divisor )
• QVector4D __imul__ ( self , float  factor )
• QVector4D __imul__ ( self , QVector4D  vector )
• QVector4D __isub__ ( self , QVector4D  vector )
• QVector4D __mul__ ( self , QMatrix4x4  matrix )
• QVector4D __mul__ ( self , QVector4D  vector )
• QVector4D __mul__ ( self , float  factor )
• QVector4D __mul__ ( self , QVector4D  v2 )
• bool __ne__ ( self , QVector4D  v2 )
• QVector4D __neg__ ( self )
• str __repr__ ( self )
• QVector4D __sub__ ( self , QVector4D  v2 )

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详细描述

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 类。

注意： 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.

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方法文档编制

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 )

构造向量采用坐标 ( 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 )

构造 4D 向量从指定 2D vector 。 z and w coordinates are set to zero.

另请参阅 toVector2D ().

QVector4D.__init__ ( self , QVector2D   vector , float  zpos , float  wpos )

构造 4D 向量从指定 2D vector 。 z and w coordinates are set to zpos and wpos 分别。

另请参阅 toVector2D ().

QVector4D.__init__ ( self , QVector3D   vector )

构造 4D 向量从指定 3D vector 。 w coordinate is set to zero.

另请参阅 toVector3D ().

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

构造 4D 向量从指定 3D vector 。 w coordinate is set to wpos .

另请参阅 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 )

从原点返回向量长度。

另请参阅 lengthSquared () 和 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.

另请参阅 length () 和 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.

另请参阅 length () 和 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.

另请参阅 length () 和 normalize ().

QVector4D.setW ( self , float  aW )

Sets the w coordinate of this point to the given w 坐标。

另请参阅 w (), setX (), setY ()，和 setZ ().

QVector4D.setX ( self , float  aX )

Sets the x coordinate of this point to the given x 坐标。

另请参阅 x (), setY (), setZ ()，和 setW ().

QVector4D.setY ( self , float  aY )

Sets the y coordinate of this point to the given y 坐标。

另请参阅 y (), setX (), setZ ()，和 setW ().

QVector4D.setZ ( self , float  aZ )

Sets the z coordinate of this point to the given z 坐标。

另请参阅 z (), setX (), setY ()，和 setW ().

QPoint QVector4D.toPoint ( self )

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

另请参阅 toPointF () and toVector2D ().

QPointF QVector4D.toPointF ( self )

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

另请参阅 toPoint () and toVector2D ().

QVector2D QVector4D.toVector2D ( self )

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

另请参阅 toVector2DAffine (), toVector3D ()，和 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.

另请参阅 toVector2D (), toVector3DAffine ()，和 toPoint ().

QVector3D QVector4D.toVector3D ( self )

Returns the 3D vector form of this 4D vector, dropping the w 坐标。

另请参阅 toVector3DAffine (), toVector2D ()，和 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.

另请参阅 toVector3D (), toVector2DAffine ()，和 toPoint ().

float QVector4D.w ( self )

返回此点的 w 坐标。

另请参阅 setW (), x (), y ()，和 z ().

float QVector4D.x ( self )

返回此点的 x 坐标。

另请参阅 setX (), y (), z ()，和 w ().

float QVector4D.y ( self )

返回此点的 y 坐标。

另请参阅 setY (), x (), z ()，和 w ().

float QVector4D.z ( self )

返回此点的 z 坐标。

另请参阅 setZ (), x (), y ()，和 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 )

str QVector4D.__repr__ ( self )

QVector4D QVector4D.__sub__ ( self , QVector4D   v2 )

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