PySide 模块

PySide.QtGui

QTransform ¶

概要 ¶

函数 ¶

def __add__ (, n)
def __div__ (, n)
def __eq__ (arg__1)
def __iadd__ (div)
def __idiv__ (div)
def __imul__ (arg__1)
def __imul__ (div)
def __isub__ (div)
def __mul__ (, n)
def __mul__ (o)
def __ne__ (arg__1)
def __reduce__ ()
def __repr__ ()
def __sub__ (, n)
def adjoint ()
def det ()
def determinant ()
def dx ()
def dy ()
def inline_type ()
def inverted ()
def isAffine ()
def isIdentity ()
def isInvertible ()
def isRotating ()
def isScaling ()
def isTranslating ()
def m11 ()
def m12 ()
def m13 ()
def m21 ()
def m22 ()
def m23 ()
def m31 ()
def m32 ()
def m33 ()
def map (a)
def map (a)
def map (l)
def map (l)
def map (p)
def map (p)
def map (p)
def map (r)
def map (x, y)
def mapRect (arg__1)
def mapRect (arg__1)
def mapToPolygon (r)
def quadToQuad (arg__1, arg__2)
def quadToSquare (arg__1)
def reset ()
def rotate (a[, axis=Qt.ZAxis])
def rotateRadians (a[, axis=Qt.ZAxis])
def scale (sx, sy)
def setMatrix (m11, m12, m13, m21, m22, m23, m31, m32, m33)
def shear (sh, sv)
def squareToQuad (arg__1)
def toAffine ()
def translate (dx, dy)
def transposed ()
def type ()

静态函数 ¶

def fromScale (dx, dy)
def fromTranslate (dx, dy)
def quadToQuad (one, two, result)
def quadToSquare (quad, result)
def squareToQuad (square, result)

详细描述 ¶

PySide.QtGui.QTransform class specifies 2D transformations of a coordinate system.

A transformation specifies how to translate, scale, shear, rotate or project the coordinate system, and is typically used when rendering graphics.

PySide.QtGui.QTransform differs from PySide.QtGui.QMatrix in that it is a true 3x3 matrix, allowing perspective transformations. PySide.QtGui.QTransform ‘s PySide.QtGui.QTransform.toAffine() method allows casting PySide.QtGui.QTransform to PySide.QtGui.QMatrix . If a perspective transformation has been specified on the matrix, then the conversion will cause loss of data.

PySide.QtGui.QTransform is the recommended transformation class in Qt.

A PySide.QtGui.QTransform object can be built using the PySide.QtGui.QTransform.setMatrix() , PySide.QtGui.QTransform.scale() , PySide.QtGui.QTransform.rotate() , PySide.QtGui.QTransform.translate() and PySide.QtGui.QTransform.shear() functions. Alternatively, it can be built by applying basic matrix operations . The matrix can also be defined when constructed, and it can be reset to the identity matrix (the default) using the PySide.QtGui.QTransform.reset() 函数。

PySide.QtGui.QTransform class supports mapping of graphic primitives: A given point, line, polygon, region, or painter path can be mapped to the coordinate system defined by this matrix using the PySide.QtGui.QTransform.map() function. In case of a rectangle, its coordinates can be transformed using the PySide.QtGui.QTransform.mapRect() function. A rectangle can also be transformed into a polygon (mapped to the coordinate system defined by this matrix), using the PySide.QtGui.QTransform.mapToPolygon() 函数。

PySide.QtGui.QTransform provides the PySide.QtGui.QTransform.isIdentity() function which returns true if the matrix is the identity matrix, and the PySide.QtGui.QTransform.isInvertible() function which returns true if the matrix is non-singular (i.e. AB = BA = I). The PySide.QtGui.QTransform.inverted() function returns an inverted copy of this matrix if it is invertible (otherwise it returns the identity matrix), and PySide.QtGui.QTransform.adjoint() returns the matrix's classical adjoint. In addition, PySide.QtGui.QTransform provides the PySide.QtGui.QTransform.determinant() function which returns the matrix's determinant.

Finally, the PySide.QtGui.QTransform class supports matrix multiplication, addition and subtraction, and objects of the class can be streamed as well as compared.

渲染图形 ¶

When rendering graphics, the matrix defines the transformations but the actual transformation is performed by the drawing routines in PySide.QtGui.QPainter .

默认情况下， PySide.QtGui.QPainter operates on the associated device's own coordinate system. The standard coordinate system of a PySide.QtGui.QPaintDevice has its origin located at the top-left position. The x values increase to the right; y values increase downward. For a complete description, see the coordinate system 文档编制。

PySide.QtGui.QPainter has functions to translate, scale, shear and rotate the coordinate system without using a PySide.QtGui.QTransform 。例如：

../../_images/qtransform-simpletransformation.png

def paintEvent(self, event)
    painter = QPainter(self)
    painter.setPen(QPen(Qt.blue, 1, Qt.DashLine))
    painter.drawRect(0, 0, 100, 100)
    painter.rotate(45)
    painter.setFont(QFont("Helvetica", 24))
    painter.setPen(QPen(Qt.black, 1))
    painter.drawText(20, 10, "QTransform")

Although these functions are very convenient, it can be more efficient to build a PySide.QtGui.QTransform 和调用 QPainter.setTransform() if you want to perform more than a single transform operation. For example:

../../_images/qtransform-combinedtransformation.png

def paintEvent(self, event)
    painter = QPainter(self)
    painter.setPen(QPen(Qt.blue, 1, Qt.DashLine))
    painter.drawRect(0, 0, 100, 100)
    transform = QTransform()
    transform.translate(50, 50)
    transform.rotate(45)
    transform.scale(0.5, 1.0)
    painter.setTransform(transform)
    painter.setFont(QFont("Helvetica", 24))
    painter.setPen(QPen(Qt.black, 1))
    painter.drawText(20, 10, "QTransform")

基本矩阵运算 ¶

../../_images/qtransform-representation.png

A PySide.QtGui.QTransform object contains a 3 x 3 matrix. The m31 ( dx ) and m32 ( dy ) elements specify horizontal and vertical translation. The m11 and m22 elements specify horizontal and vertical scaling. The m21 and m12 elements specify horizontal and vertical shearing . And finally, the m13 and m23 elements specify horizontal and vertical projection, with m33 as an additional projection factor.

PySide.QtGui.QTransform transforms a point in the plane to another point using the following formulas:

x' = m11*x + m21*y + dx
y' = m22*y + m12*x + dy
if is not affine:
    w' = m13*x + m23*y + m33
    x' /= w'
    y' /= w'

The point (x, y) is the original point, and (x', y') is the transformed point. (x', y') can be transformed back to (x, y) by performing the same operation on the PySide.QtGui.QTransform.inverted() matrix.

Translation is the simplest transformation. Setting dx and dy will move the coordinate system dx units along the X axis and dy units along the Y axis. Scaling can be done by setting m11 and m22 . For example, setting m11 to 2 and m22 to 1.5 will double the height and increase the width by 50%. The identity matrix has m11 , m22 ，和 m33 set to 1 (all others are set to 0) mapping a point to itself. Shearing is controlled by m12 and m21 . Setting these elements to values different from zero will twist the coordinate system. Rotation is achieved by setting both the shearing factors and the scaling factors. Perspective transformation is achieved by setting both the projection factors and the scaling factors.

Here's the combined transformations example using basic matrix operations:

../../_images/qtransform-combinedtransformation2.png

def paintEvent(self, event)
    pi = 3.14
    a    = pi/180 * 45.0
    sina = sin(a)
    cosa = cos(a)
    translationTransform = QTransform(1, 0, 0, 1, 50.0, 50.0)
    rotationTransform = QTransform(cosa, sina, -sina, cosa, 0, 0)
    scalingTransform = QTransform(0.5, 0, 0, 1.0, 0, 0)
    transform = QTransform()
    transform = scalingTransform * rotationTransform * translationTransform
    painter = QPainter(self)
    painter.setPen(QPen(Qt.blue, 1, Qt.DashLine))
    painter.drawRect(0, 0, 100, 100)
    painter.setTransform(transform)
    painter.setFont(QFont("Helvetica", 24))
    painter.setPen(QPen(Qt.black, 1))
    painter.drawText(20, 10, "QTransform")

另请参阅

PySide.QtGui.QPainter 坐标系统 Affine Transformations Demo 变换范例

class PySide.QtGui. QTransform ¶

class PySide.QtGui. QTransform ( mtx )

class PySide.QtGui. QTransform ( QTransform )

class PySide.QtGui. QTransform ( h11 , h12 , h13 , h21 , h22 , h23 , h31 , h32 [ , h33=1.0 ] )

class PySide.QtGui. QTransform ( h11 , h12 , h21 , h22 , dx , dy )

参数：

参数：	h31 – `PySide.QtCore.qreal` h21 – `PySide.QtCore.qreal` h32 – `PySide.QtCore.qreal` h11 – `PySide.QtCore.qreal` h22 – `PySide.QtCore.qreal` h33 – `PySide.QtCore.qreal` h12 – `PySide.QtCore.qreal` h23 – `PySide.QtCore.qreal` dx – `PySide.QtCore.qreal` h13 – `PySide.QtCore.qreal` dy – `PySide.QtCore.qreal` mtx – `PySide.QtGui.QMatrix` QTransform – `PySide.QtGui.QTransform`

h31 – PySide.QtCore.qreal
h21 – PySide.QtCore.qreal
h32 – PySide.QtCore.qreal
h11 – PySide.QtCore.qreal
h22 – PySide.QtCore.qreal
h33 – PySide.QtCore.qreal
h12 – PySide.QtCore.qreal
h23 – PySide.QtCore.qreal
dx – PySide.QtCore.qreal
h13 – PySide.QtCore.qreal
dy – PySide.QtCore.qreal
mtx – PySide.QtGui.QMatrix
QTransform – PySide.QtGui.QTransform

构造恒等矩阵。

All elements are set to zero except m11 and m22 (specifying the scale) and m13 which are set to 1.

另请参阅

PySide.QtGui.QTransform.reset()

Constructs a matrix that is a copy of the given matrix 。注意， m13 , m23 ，和 m33 elements are set to 0, 0, and 1 respectively.

构造矩阵采用元素 m11 , m12 , m13 , m21 , m22 , m23 , m31 , m32 , m33 .

另请参阅

PySide.QtGui.QTransform.setMatrix()

构造矩阵采用元素 m11 , m12 , m21 , m22 , dx and dy .

另请参阅

PySide.QtGui.QTransform.setMatrix()

PySide.QtGui.QTransform. TransformationType ¶

常量	描述
QTransform.TxNone
QTransform.TxTranslate
QTransform.TxScale
QTransform.TxRotate
QTransform.TxShear
QTransform.TxProject

PySide.QtGui.QTransform. __reduce__ ( ) ¶

返回类型：	`PyObject`

PySide.QtGui.QTransform. __repr__ ( ) ¶

返回类型：	`PyObject`

PySide.QtGui.QTransform. adjoint ( ) ¶

返回类型：	`PySide.QtGui.QTransform`

Returns the adjoint of this matrix.

PySide.QtGui.QTransform. det ( ) ¶

返回类型：	`PySide.QtCore.qreal`

Returns the matrix's determinant. Use PySide.QtGui.QTransform.determinant() 代替。

PySide.QtGui.QTransform. determinant ( ) ¶

返回类型：	`PySide.QtCore.qreal`

Returns the matrix's determinant.

PySide.QtGui.QTransform. dx ( ) ¶

返回类型：	`PySide.QtCore.qreal`

Returns the horizontal translation factor.

另请参阅

PySide.QtGui.QTransform.m31() PySide.QtGui.QTransform.translate() 基本 Matrix Operations

PySide.QtGui.QTransform. dy ( ) ¶

返回类型：	`PySide.QtCore.qreal`

Returns the vertical translation factor.

另请参阅

PySide.QtGui.QTransform.translate() 基本 Matrix Operations

static PySide.QtGui.QTransform. fromScale ( dx , dy ) ¶

参数：	dx – `PySide.QtCore.qreal` dy – `PySide.QtCore.qreal`
返回类型：	`PySide.QtGui.QTransform`

Creates a matrix which corresponds to a scaling of sx horizontally and sy vertically. This is the same as PySide.QtGui.QTransform.QTransform() .scale(sx, sy) but slightly faster.

static PySide.QtGui.QTransform. fromTranslate ( dx , dy ) ¶

参数：	dx – `PySide.QtCore.qreal` dy – `PySide.QtCore.qreal`
返回类型：	`PySide.QtGui.QTransform`

Creates a matrix which corresponds to a translation of dx along the x axis and dy along the y axis. This is the same as PySide.QtGui.QTransform.QTransform() .translate(dx, dy) but slightly faster.

PySide.QtGui.QTransform. inline_type ( ) ¶

返回类型：	`PySide.QtGui.QTransform.TransformationType`

PySide.QtGui.QTransform. inverted ( ) ¶

返回类型：	PyTuple

Returns an inverted copy of this matrix.

If the matrix is singular (not invertible), the returned matrix is the identity matrix. If invertible is valid (i.e. not 0), its value is set to true if the matrix is invertible, otherwise it is set to false.

另请参阅

PySide.QtGui.QTransform.isInvertible()

PySide.QtGui.QTransform. isAffine ( ) ¶

返回类型：	`PySide.QtCore.bool`

Returns true if the matrix represent an affine transformation, otherwise returns false.

PySide.QtGui.QTransform. isIdentity ( ) ¶

返回类型：	`PySide.QtCore.bool`

Returns true if the matrix is the identity matrix, otherwise returns false.

另请参阅

PySide.QtGui.QTransform.reset()

PySide.QtGui.QTransform. isInvertible ( ) ¶

返回类型：	`PySide.QtCore.bool`

Returns true if the matrix is invertible, otherwise returns false.

另请参阅

PySide.QtGui.QTransform.inverted()

PySide.QtGui.QTransform. isRotating ( ) ¶

返回类型：	`PySide.QtCore.bool`

Returns true if the matrix represents some kind of a rotating transformation, otherwise returns false.

另请参阅

PySide.QtGui.QTransform.reset()

PySide.QtGui.QTransform. isScaling ( ) ¶

返回类型：	`PySide.QtCore.bool`

Returns true if the matrix represents a scaling transformation, otherwise returns false.

另请参阅

PySide.QtGui.QTransform.reset()

PySide.QtGui.QTransform. isTranslating ( ) ¶

返回类型：	`PySide.QtCore.bool`

Returns true if the matrix represents a translating transformation, otherwise returns false.

另请参阅

PySide.QtGui.QTransform.reset()

PySide.QtGui.QTransform. m11 ( ) ¶

返回类型：	`PySide.QtCore.qreal`

Returns the horizontal scaling factor.

另请参阅

PySide.QtGui.QTransform.scale() 基本 Matrix Operations

PySide.QtGui.QTransform. m12 ( ) ¶

返回类型：	`PySide.QtCore.qreal`

Returns the vertical shearing factor.

另请参阅

PySide.QtGui.QTransform.shear() 基本 Matrix Operations

PySide.QtGui.QTransform. m13 ( ) ¶

返回类型：	`PySide.QtCore.qreal`

Returns the horizontal projection factor.

另请参阅

PySide.QtGui.QTransform.translate() 基本 Matrix Operations

PySide.QtGui.QTransform. m21 ( ) ¶

返回类型：	`PySide.QtCore.qreal`

Returns the horizontal shearing factor.

另请参阅

PySide.QtGui.QTransform.shear() 基本 Matrix Operations

PySide.QtGui.QTransform. m22 ( ) ¶

返回类型：	`PySide.QtCore.qreal`

Returns the vertical scaling factor.

另请参阅

PySide.QtGui.QTransform.scale() 基本 Matrix Operations

PySide.QtGui.QTransform. m23 ( ) ¶

返回类型：	`PySide.QtCore.qreal`

Returns the vertical projection factor.

另请参阅

PySide.QtGui.QTransform.translate() 基本 Matrix Operations

PySide.QtGui.QTransform. m31 ( ) ¶

返回类型：	`PySide.QtCore.qreal`

Returns the horizontal translation factor.

另请参阅

PySide.QtGui.QTransform.dx() PySide.QtGui.QTransform.translate() 基本 Matrix Operations

PySide.QtGui.QTransform. m32 ( ) ¶

返回类型：	`PySide.QtCore.qreal`

Returns the vertical translation factor.

另请参阅

PySide.QtGui.QTransform.dy() PySide.QtGui.QTransform.translate() 基本 Matrix Operations

PySide.QtGui.QTransform. m33 ( ) ¶

返回类型：	`PySide.QtCore.qreal`

Returns the division factor.

另请参阅

PySide.QtGui.QTransform.translate() 基本 Matrix Operations

PySide.QtGui.QTransform. map ( r ) ¶

参数：	r – `PySide.QtGui.QRegion`
返回类型：	`PySide.QtGui.QRegion`

这是重载函数。

创建和返回 PySide.QtGui.QRegion object that is a copy of the given region , mapped into the coordinate system defined by this matrix.

Calling this method can be rather expensive if rotations or shearing are used.

PySide.QtGui.QTransform. map ( x , y )

参数：	x – `PySide.QtCore.qreal` y – `PySide.QtCore.qreal`

Maps the given coordinates x and y into the coordinate system defined by this matrix. The resulting values are put in *``tx`` and *``ty`` , respectively.

The coordinates are transformed using the following formulas:

x' = m11*x + m21*y + dx
y' = m22*y + m12*x + dy
if is not affine:
    w' = m13*x + m23*y + m33
    x' /= w'
    y' /= w'

The point (x, y) is the original point, and (x', y') is the transformed point.

另请参阅

基本 Matrix Operations

PySide.QtGui.QTransform. map ( a )

参数：	a – `PySide.QtGui.QPolygon`
返回类型：	`PySide.QtGui.QPolygon`

这是重载函数。

创建和返回 PySide.QtGui.QPolygon object that is a copy of the given polygon , mapped into the coordinate system defined by this matrix. Note that the transformed coordinates are rounded to the nearest integer.

PySide.QtGui.QTransform. map ( a )

参数：	a – `PySide.QtGui.QPolygonF`
返回类型：	`PySide.QtGui.QPolygonF`

这是重载函数。

创建和返回 PySide.QtGui.QPolygonF object that is a copy of the given polygon , mapped into the coordinate system defined by this matrix.

PySide.QtGui.QTransform. map ( l )

参数：	l – `PySide.QtCore.QLine`
返回类型：	`PySide.QtCore.QLine`

这是重载函数。

创建和返回 PySide.QtCore.QLineF object that is a copy of the given line, l , mapped into the coordinate system defined by this matrix.

PySide.QtGui.QTransform. map ( l )

参数：	l – `PySide.QtCore.QLineF`
返回类型：	`PySide.QtCore.QLineF`

这是重载函数。

创建和返回 PySide.QtCore.QLine object that is a copy of the given line , mapped into the coordinate system defined by this matrix. Note that the transformed coordinates are rounded to the nearest integer.

PySide.QtGui.QTransform. map ( p )

参数：	p – `PySide.QtCore.QPointF`
返回类型：	`PySide.QtCore.QPointF`

这是重载函数。

创建和返回 PySide.QtCore.QPointF object that is a copy of the given point, p , mapped into the coordinate system defined by this matrix.

PySide.QtGui.QTransform. map ( p )

参数：	p – `PySide.QtGui.QPainterPath`
返回类型：	`PySide.QtGui.QPainterPath`

这是重载函数。

创建和返回 PySide.QtGui.QPainterPath object that is a copy of the given path , mapped into the coordinate system defined by this matrix.

PySide.QtGui.QTransform. map ( p )

参数：	p – `PySide.QtCore.QPoint`
返回类型：	`PySide.QtCore.QPoint`

这是重载函数。

创建和返回 PySide.QtCore.QPoint object that is a copy of the given point , mapped into the coordinate system defined by this matrix. Note that the transformed coordinates are rounded to the nearest integer.

PySide.QtGui.QTransform. mapRect ( arg__1 ) ¶

参数：	arg__1 – `PySide.QtCore.QRectF`
返回类型：	`PySide.QtCore.QRectF`

创建和返回 PySide.QtCore.QRectF object that is a copy of the given rectangle , mapped into the coordinate system defined by this matrix.

The rectangle's coordinates are transformed using the following formulas:

x' = m11*x + m21*y + dx
y' = m22*y + m12*x + dy
if is not affine:
    w' = m13*x + m23*y + m33
    x' /= w'
    y' /= w'

If rotation or shearing has been specified, this function returns the bounding rectangle. To retrieve the exact region the given rectangle maps to, use the PySide.QtGui.QTransform.mapToPolygon() function instead.

另请参阅

PySide.QtGui.QTransform.mapToPolygon() 基本 Matrix Operations

PySide.QtGui.QTransform. mapRect ( arg__1 )

参数：	arg__1 – `PySide.QtCore.QRect`
返回类型：	`PySide.QtCore.QRect`

这是重载函数。

创建和返回 PySide.QtCore.QRect object that is a copy of the given rectangle , mapped into the coordinate system defined by this matrix. Note that the transformed coordinates are rounded to the nearest integer.

PySide.QtGui.QTransform. mapToPolygon ( r ) ¶

参数：	r – `PySide.QtCore.QRect`
返回类型：	`PySide.QtGui.QPolygon`

创建和返回 PySide.QtGui.QPolygon representation of the given rectangle , mapped into the coordinate system defined by this matrix.

The rectangle's coordinates are transformed using the following formulas:

x' = m11*x + m21*y + dx
y' = m22*y + m12*x + dy
if is not affine:
    w' = m13*x + m23*y + m33
    x' /= w'
    y' /= w'

Polygons and rectangles behave slightly differently when transformed (due to integer rounding), so matrix.map(QPolygon(rectangle)) is not always the same as matrix.mapToPolygon(rectangle) .

另请参阅

PySide.QtGui.QTransform.mapRect() 基本 Matrix Operations

PySide.QtGui.QTransform. __ne__ ( arg__1 ) ¶

参数：	arg__1 – `PySide.QtGui.QTransform`
返回类型：	`PySide.QtCore.bool`

Returns true if this matrix is not equal to the given matrix ，否则返回 false。

PySide.QtGui.QTransform. __mul__ ( n ) ¶

参数：	n – `PySide.QtCore.qreal`
返回类型：	`PySide.QtGui.QTransform`

PySide.QtGui.QTransform. __mul__ ( o )

参数：	o – `PySide.QtGui.QTransform`
返回类型：	`PySide.QtGui.QTransform`

Returns the result of multiplying this matrix by the given matrix .

Note that matrix multiplication is not commutative, i.e. a*b != b*a.

PySide.QtGui.QTransform. __imul__ ( div ) ¶

参数：	div – `PySide.QtCore.qreal`
返回类型：	`PySide.QtGui.QTransform`

这是重载函数。

Returns the result of performing an element-wise multiplication of this matrix with the given scalar .

PySide.QtGui.QTransform. __imul__ ( arg__1 )

参数：	arg__1 – `PySide.QtGui.QTransform`
返回类型：	`PySide.QtGui.QTransform`

这是重载函数。

Returns the result of multiplying this matrix by the given matrix .

PySide.QtGui.QTransform. __add__ ( n ) ¶

参数：	n – `PySide.QtCore.qreal`
返回类型：	`PySide.QtGui.QTransform`

PySide.QtGui.QTransform. __iadd__ ( div ) ¶

参数：	div – `PySide.QtCore.qreal`
返回类型：	`PySide.QtGui.QTransform`

这是重载函数。

Returns the matrix obtained by adding the given scalar to each element of this matrix.

PySide.QtGui.QTransform. __sub__ ( n ) ¶

参数：	n – `PySide.QtCore.qreal`
返回类型：	`PySide.QtGui.QTransform`

PySide.QtGui.QTransform. __isub__ ( div ) ¶

参数：	div – `PySide.QtCore.qreal`
返回类型：	`PySide.QtGui.QTransform`

这是重载函数。

Returns the matrix obtained by subtracting the given scalar from each element of this matrix.

PySide.QtGui.QTransform. __div__ ( n ) ¶

参数：	n – `PySide.QtCore.qreal`
返回类型：	`PySide.QtGui.QTransform`

PySide.QtGui.QTransform. __idiv__ ( div ) ¶

参数：	div – `PySide.QtCore.qreal`
返回类型：	`PySide.QtGui.QTransform`

这是重载函数。

Returns the result of performing an element-wise division of this matrix by the given scalar .

PySide.QtGui.QTransform. __eq__ ( arg__1 ) ¶

参数：	arg__1 – `PySide.QtGui.QTransform`
返回类型：	`PySide.QtCore.bool`

Returns true if this matrix is equal to the given matrix ，否则返回 false。

PySide.QtGui.QTransform. quadToQuad ( arg__1 , arg__2 ) ¶

参数：	arg__1 – `PySide.QtGui.QPolygonF` arg__2 – `PySide.QtGui.QPolygonF`
返回类型：	`PyObject`

static PySide.QtGui.QTransform. quadToQuad ( one , two , result )

参数：	one – `PySide.QtGui.QPolygonF` two – `PySide.QtGui.QPolygonF` result – `PySide.QtGui.QTransform`
返回类型：	`PySide.QtCore.bool`

Creates a transformation matrix, trans , that maps a four-sided polygon, one , to another four-sided polygon, two . Returns true if the transformation is possible; otherwise returns false.

This is a convenience method combining PySide.QtGui.QTransform.quadToSquare() and PySide.QtGui.QTransform.squareToQuad() methods. It allows the input quad to be transformed into any other quad.

另请参阅

PySide.QtGui.QTransform.squareToQuad() PySide.QtGui.QTransform.quadToSquare()

static PySide.QtGui.QTransform. quadToSquare ( quad , result ) ¶

参数：	quad – `PySide.QtGui.QPolygonF` result – `PySide.QtGui.QTransform`
返回类型：	`PySide.QtCore.bool`

Creates a transformation matrix, trans , that maps a four-sided polygon, quad , to a unit square. Returns true if the transformation is constructed or false if such a transformation does not exist.

另请参阅

PySide.QtGui.QTransform.squareToQuad() PySide.QtGui.QTransform.quadToQuad()

PySide.QtGui.QTransform. quadToSquare ( arg__1 )

参数：	arg__1 – `PySide.QtGui.QPolygonF`
返回类型：	`PyObject`

PySide.QtGui.QTransform. reset ( ) ¶: Resets the matrix to an identity matrix, i.e. all elements are set to zero, except m11 and m22 (specifying the scale) and m33 which are set to 1.

另请参阅

PySide.QtGui.QTransform.QTransform() PySide.QtGui.QTransform.isIdentity() 基本 Matrix Operations

PySide.QtGui.QTransform. rotate ( a [ , axis=Qt.ZAxis ] ) ¶

参数：	a – `PySide.QtCore.qreal` axis – `PySide.QtCore.Qt.Axis`
返回类型：	`PySide.QtGui.QTransform`

PySide.QtGui.QTransform. rotateRadians ( a [ , axis=Qt.ZAxis ] ) ¶

参数：	a – `PySide.QtCore.qreal` axis – `PySide.QtCore.Qt.Axis`
返回类型：	`PySide.QtGui.QTransform`

PySide.QtGui.QTransform. scale ( sx , sy ) ¶

参数：	sx – `PySide.QtCore.qreal` sy – `PySide.QtCore.qreal`
返回类型：	`PySide.QtGui.QTransform`

Scales the coordinate system by sx horizontally and sy vertically, and returns a reference to the matrix.

另请参阅

PySide.QtGui.QTransform.setMatrix()

PySide.QtGui.QTransform. setMatrix ( m11 , m12 , m13 , m21 , m22 , m23 , m31 , m32 , m33 ) ¶

参数：	m11 – `PySide.QtCore.qreal` m12 – `PySide.QtCore.qreal` m13 – `PySide.QtCore.qreal` m21 – `PySide.QtCore.qreal` m22 – `PySide.QtCore.qreal` m23 – `PySide.QtCore.qreal` m31 – `PySide.QtCore.qreal` m32 – `PySide.QtCore.qreal` m33 – `PySide.QtCore.qreal`

Sets the matrix elements to the specified values, m11 , m12 , m13 m21 , m22 , m23 m31 , m32 and m33 . Note that this function replaces the previous values. PySide.QtGui.QTransform provides the PySide.QtGui.QTransform.translate() , PySide.QtGui.QTransform.rotate() , PySide.QtGui.QTransform.scale() and PySide.QtGui.QTransform.shear() convenience functions to manipulate the various matrix elements based on the currently defined coordinate system.

另请参阅

PySide.QtGui.QTransform.QTransform()

PySide.QtGui.QTransform. shear ( sh , sv ) ¶

参数：	sh – `PySide.QtCore.qreal` sv – `PySide.QtCore.qreal`
返回类型：	`PySide.QtGui.QTransform`

Shears the coordinate system by sh horizontally and sv vertically, and returns a reference to the matrix.

另请参阅

PySide.QtGui.QTransform.setMatrix()

PySide.QtGui.QTransform. squareToQuad ( arg__1 ) ¶

参数：	arg__1 – `PySide.QtGui.QPolygonF`
返回类型：	`PyObject`

static PySide.QtGui.QTransform. squareToQuad ( square , result )

参数：	square – `PySide.QtGui.QPolygonF` result – `PySide.QtGui.QTransform`
返回类型：	`PySide.QtCore.bool`

Creates a transformation matrix, trans , that maps a unit square to a four-sided polygon, quad . Returns true if the transformation is constructed or false if such a transformation does not exist.

另请参阅

PySide.QtGui.QTransform.quadToSquare() PySide.QtGui.QTransform.quadToQuad()

PySide.QtGui.QTransform. toAffine ( ) ¶

返回类型：	`PySide.QtGui.QMatrix`

返回 PySide.QtGui.QTransform as an affine matrix.

警告

If a perspective transformation has been specified, then the conversion will cause loss of data.

PySide.QtGui.QTransform. translate ( dx , dy ) ¶

参数：	dx – `PySide.QtCore.qreal` dy – `PySide.QtCore.qreal`
返回类型：	`PySide.QtGui.QTransform`

Moves the coordinate system dx along the x axis and dy along the y axis, and returns a reference to the matrix.

另请参阅

PySide.QtGui.QTransform.setMatrix()

PySide.QtGui.QTransform. transposed ( ) ¶

返回类型：	`PySide.QtGui.QTransform`

Returns the transpose of this matrix.

PySide.QtGui.QTransform. type ( ) ¶

返回类型：	`PySide.QtGui.QTransform.TransformationType`

Returns the transformation type of this matrix.

The transformation type is the highest enumeration value capturing all of the matrix's transformations. For example, if the matrix both scales and shears, the type would be TxShear , because TxShear has a higher enumeration value than TxScale .

Knowing the transformation type of a matrix is useful for optimization: you can often handle specific types more optimally than handling the generic case.

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渲染图形 ¶

基本矩阵运算 ¶