QRectF ¶

QRectF class defines a rectangle in the plane using floating point precision. 更多 …

概要 ¶

函数 ¶

def __add__ (, rhs)
def __add__ (lhs)
def __and__ (r)
def __eq__ (, arg__2)
def __eq__ (, r2)
def __iadd__ (margins)
def __iand__ (r)
def __ior__ (r)
def __isub__ (margins)
def __ne__ (, arg__2)
def __ne__ (, r2)
def __or__ (r)
def __reduce__ ()
def __repr__ ()
def __sub__ (, rhs)
def adjust (x1, y1, x2, y2)
def adjusted (x1, y1, x2, y2)
def bottom ()
def bottomLeft ()
def bottomRight ()
def center ()
def contains (p)
def contains (r)
def contains (x, y)
def getCoords ()
def getRect ()
def height ()
def intersected (other)
def intersects (r)
def isEmpty ()
def isNull ()
def isValid ()
def left ()
def marginsAdded (margins)
def marginsRemoved (margins)
def moveBottom (pos)
def moveBottomLeft (p)
def moveBottomRight (p)
def moveCenter (p)
def moveLeft (pos)
def moveRight (pos)
def moveTo (p)
def moveTo (x, y)
def moveTop (pos)
def moveTopLeft (p)
def moveTopRight (p)
def normalized ()
def right ()
def setBottom (pos)
def setBottomLeft (p)
def setBottomRight (p)
def setCoords (x1, y1, x2, y2)
def setHeight (h)
def setLeft (pos)
def setRect (x, y, w, h)
def setRight (pos)
def setSize (s)
def setTop (pos)
def setTopLeft (p)
def setTopRight (p)
def setWidth (w)
def setX (pos)
def setY (pos)
def size ()
def toAlignedRect ()
def toRect ()
def top ()
def topLeft ()
def topRight ()
def translate (dx, dy)
def translate (p)
def translated (dx, dy)
def translated (p)
def transposed ()
def united (other)
def width ()
def x ()
def y ()

详细描述 ¶

A rectangle is normally expressed as a top-left corner and a size. The size (width and height) of a QRectF is always equivalent to the mathematical rectangle that forms the basis for its rendering.

A QRectF can be constructed with a set of left, top, width and height coordinates, or from a QPointF 和 QSizeF 。以下代码创建 2 个恒等矩形。
r1 = QRectF(100, 200, 11, 16)
r2 = QRectF(QPoint(100, 200), QSize(11, 16))
											
There is also a third constructor creating a QRectF from a QRect , and a corresponding toRect() function that returns a QRect object based on the values of this rectangle (note that the coordinates in the returned rectangle are rounded to the nearest integer).

QRectF class provides a collection of functions that return the various rectangle coordinates, and enable manipulation of these. QRectF also provides functions to move the rectangle relative to the various coordinates. In addition there is a moveTo() function that moves the rectangle, leaving its top left corner at the given coordinates. Alternatively, the translate() function moves the rectangle the given offset relative to the current position, and the translated() function returns a translated copy of this rectangle.

size() function returns the rectange’s dimensions as a QSizeF . The dimensions can also be retrieved separately using the width() and height() functions. To manipulate the dimensions use the setSize() , setWidth() or setHeight() functions. Alternatively, the size can be changed by applying either of the functions setting the rectangle coordinates, for example, setBottom() or setRight() .

contains() function tells whether a given point is inside the rectangle or not, and the intersects() function returns true if this rectangle intersects with a given rectangle (otherwise false). The QRectF class also provides the intersected() function which returns the intersection rectangle, and the united() function which returns the rectangle that encloses the given rectangle and this:

intersected()

united()

isEmpty() function returns true if the rectangle’s width or height is less than, or equal to, 0. Note that an empty rectangle is not valid: The isValid() function returns true if both width and height is larger than 0. A null rectangle ( isNull() == true) on the other hand, has both width and height set to 0.

Note that due to the way QRect and QRectF are defined, an empty QRectF is defined in essentially the same way as QRect .

最后， QRectF objects can be streamed as well as compared.

渲染 ¶

当使用 anti-aliased painter, the boundary line of a QRectF will be rendered symmetrically on both sides of the mathematical rectangle’s boundary line. But when using an aliased painter (the default) other rules apply.

Then, when rendering with a one pixel wide pen the QRectF ‘s boundary line will be rendered to the right and below the mathematical rectangle’s boundary line.

When rendering with a two pixels wide pen the boundary line will be split in the middle by the mathematical rectangle. This will be the case whenever the pen is set to an even number of pixels, while rendering with a pen with an odd number of pixels, the spare pixel will be rendered to the right and below the mathematical rectangle as in the one pixel case.

Logical representation

One pixel wide pen

Two pixel wide pen

Three pixel wide pen

坐标 ¶

QRectF class provides a collection of functions that return the various rectangle coordinates, and enable manipulation of these. QRectF also provides functions to move the rectangle relative to the various coordinates.

For example: the bottom() , setBottom() and moveBottom() functions: bottom() returns the y-coordinate of the rectangle’s bottom edge, setBottom() sets the bottom edge of the rectangle to the given y coordinate (it may change the height, but will never change the rectangle’s top edge) and moveBottom() moves the entire rectangle vertically, leaving the rectangle’s bottom edge at the given y coordinate and its size unchanged.

It is also possible to add offsets to this rectangle’s coordinates using the adjust() function, as well as retrieve a new rectangle based on adjustments of the original one using the adjusted() function. If either of the width and height is negative, use the normalized() function to retrieve a rectangle where the corners are swapped.

此外， QRectF provides the getCoords() function which extracts the position of the rectangle’s top-left and bottom-right corner, and the getRect() function which extracts the rectangle’s top-left corner, width and height. Use the setCoords() and setRect() function to manipulate the rectangle’s coordinates and dimensions in one go.

另请参阅

QRect QRegion

class QRectF ¶

QRectF(topleft, bottomRight)

QRectF(topleft, size)

QRectF(rect)

QRectF(QRectF)

QRectF(left, top, width, height)

param size

QSizeF

param top

qreal

param QRectF

QRectF

param bottomRight

QPointF

param topleft

QPointF

param rect

QRect

param left

qreal

param width

qreal

param height

qreal

构造 null 矩形。

另请参阅

isNull()

构造 QRectF rectangle from the given QRect rectangle .

另请参阅

toRect()

构造矩形采用 ( x , y ) 作为其左上角和给定 width and height .

另请参阅

setRect()

PySide2.QtCore.QRectF. __reduce__ ( ) ¶

返回类型: PyObject

PySide2.QtCore.QRectF. __repr__ ( ) ¶

返回类型: PyObject

PySide2.QtCore.QRectF. adjust ( x1 , y1 , x2 , y2 ) ¶

参数

x1 – qreal
y1 – qreal
x2 – qreal
y2 – qreal

添加 dx1 , dy1 , dx2 and dy2 respectively to the existing coordinates of the rectangle.

另请参阅

adjusted() setRect()

PySide2.QtCore.QRectF. adjusted ( x1 , y1 , x2 , y2 ) ¶

参数

x1 – qreal
y1 – qreal
x2 – qreal
y2 – qreal

返回类型

QRectF

返回新的矩形采用 dx1 , dy1 , dx2 and dy2 added respectively to the existing coordinates of this rectangle.

另请参阅

adjust()

PySide2.QtCore.QRectF. bottom ( ) ¶

返回类型: qreal

Returns the y-coordinate of the rectangle’s bottom edge.

另请参阅

setBottom() bottomLeft() bottomRight()

PySide2.QtCore.QRectF. bottomLeft ( ) ¶

返回类型: QPointF

Returns the position of the rectangle’s bottom-left corner.

另请参阅

setBottomLeft() bottom() left()

PySide2.QtCore.QRectF. bottomRight ( ) ¶

返回类型: QPointF

Returns the position of the rectangle’s bottom-right corner.

另请参阅

setBottomRight() bottom() right()

PySide2.QtCore.QRectF. center ( ) ¶

返回类型: QPointF

返回矩形的中心点。

另请参阅

moveCenter()

PySide2.QtCore.QRectF. contains ( r ) ¶

参数: r – QRectF
返回类型: bool

PySide2.QtCore.QRectF. contains ( x , y ) ¶

参数

x – qreal
y – qreal

返回类型

bool

这是重载函数。

返回 true 若点 ( x , y ) is inside or on the edge of the rectangle; otherwise returns false .

PySide2.QtCore.QRectF. contains ( p ) ¶

参数: p – QPointF
返回类型: bool

PySide2.QtCore.QRectF. getCoords ( ) ¶: Extracts the position of the rectangle’s top-left corner to *``x1`` and *``y1`` , and the position of the bottom-right corner to *``x2`` and *``y2`` .

另请参阅

setCoords() getRect()

PySide2.QtCore.QRectF. getRect ( ) ¶: Extracts the position of the rectangle’s top-left corner to *``x`` and *``y`` , and its dimensions to *``width`` and *``height`` .

另请参阅

setRect() getCoords()

PySide2.QtCore.QRectF. height ( ) ¶

返回类型: qreal

返回矩形的高度。

另请参阅

setHeight() width() size()

PySide2.QtCore.QRectF. intersected ( other ) ¶

参数: other – QRectF
返回类型: QRectF

Returns the intersection of this rectangle and the given rectangle 。注意 r.intersected(s) 相当于 r & s .

另请参阅

intersects() united() operator&=()

PySide2.QtCore.QRectF. intersects ( r ) ¶

参数: r – QRectF
返回类型: bool

返回 true if this rectangle intersects with the given rectangle (i.e. there is a non-empty area of overlap between them), otherwise returns false .

The intersection rectangle can be retrieved using the intersected() 函数。

另请参阅

contains()

PySide2.QtCore.QRectF. isEmpty ( ) ¶

返回类型: bool

返回 true 若矩形为空，否则返回 false .

An empty rectangle has width() <= 0 or height() <= 0. An empty rectangle is not valid (i.e., == ! isValid() ).

使用 normalized() function to retrieve a rectangle where the corners are swapped.

另请参阅

isNull() isValid() normalized()

PySide2.QtCore.QRectF. isNull ( ) ¶

返回类型: bool

返回 true 若矩形是 null 矩形，否则返回 false .

A null rectangle has both the width and the height set to 0. A null rectangle is also empty, and hence not valid.

另请参阅

isEmpty() isValid()

PySide2.QtCore.QRectF. isValid ( ) ¶

返回类型: bool

返回 true 若矩形有效，否则返回 false .

A valid rectangle has a width() > 0 and height() > 0. Note that non-trivial operations like intersections are not defined for invalid rectangles. A valid rectangle is not empty (i.e., == ! isEmpty() ).

另请参阅

isNull() isEmpty() normalized()

PySide2.QtCore.QRectF. left ( ) ¶

返回类型: qreal

Returns the x-coordinate of the rectangle’s left edge. Equivalent to x() .

另请参阅

setLeft() topLeft() bottomLeft()

PySide2.QtCore.QRectF. marginsAdded ( margins ) ¶

参数: margins – QMarginsF
返回类型: QRectF

Returns a rectangle grown by the margins .

另请参阅

operator+=() marginsRemoved() operator-=()

PySide2.QtCore.QRectF. marginsRemoved ( margins ) ¶

参数: margins – QMarginsF
返回类型: QRectF

移除 margins 从矩形，收缩它。

另请参阅

marginsAdded() operator+=() operator-=()

PySide2.QtCore.QRectF. moveBottom ( pos ) ¶

参数: pos – qreal

Moves the rectangle vertically, leaving the rectangle’s bottom edge at the given y coordinate. The rectangle’s size is unchanged.

另请参阅

bottom() setBottom() moveTop()

PySide2.QtCore.QRectF. moveBottomLeft ( p ) ¶

参数: p – QPointF

Moves the rectangle, leaving the bottom-left corner at the given position . The rectangle’s size is unchanged.

另请参阅

setBottomLeft() moveBottom() moveLeft()

PySide2.QtCore.QRectF. moveBottomRight ( p ) ¶

参数: p – QPointF

Moves the rectangle, leaving the bottom-right corner at the given position . The rectangle’s size is unchanged.

另请参阅

setBottomRight() moveBottom() moveRight()

PySide2.QtCore.QRectF. moveCenter ( p ) ¶

参数: p – QPointF

移动矩形，使中心点位于给定 position . The rectangle’s size is unchanged.

另请参阅

center()

PySide2.QtCore.QRectF. moveLeft ( pos ) ¶

参数: pos – qreal

Moves the rectangle horizontally, leaving the rectangle’s left edge at the given x coordinate. The rectangle’s size is unchanged.

另请参阅

left() setLeft() moveRight()

PySide2.QtCore.QRectF. moveRight ( pos ) ¶

参数: pos – qreal

Moves the rectangle horizontally, leaving the rectangle’s right edge at the given x coordinate. The rectangle’s size is unchanged.

另请参阅

right() setRight() moveLeft()

PySide2.QtCore.QRectF. moveTo ( p ) ¶

参数: p – QPointF

这是重载函数。

Moves the rectangle, leaving the top-left corner at the given position .

PySide2.QtCore.QRectF. moveTo ( x , y ) ¶

参数

x – qreal
y – qreal

Moves the rectangle, leaving the top-left corner at the given position ( x , y ). The rectangle’s size is unchanged.

另请参阅

translate() moveTopLeft()

PySide2.QtCore.QRectF. moveTop ( pos ) ¶

参数: pos – qreal

Moves the rectangle vertically, leaving the rectangle’s top line at the given y coordinate. The rectangle’s size is unchanged.

另请参阅

top() setTop() moveBottom()

PySide2.QtCore.QRectF. moveTopLeft ( p ) ¶

参数: p – QPointF

Moves the rectangle, leaving the top-left corner at the given position . The rectangle’s size is unchanged.

另请参阅

setTopLeft() moveTop() moveLeft()

PySide2.QtCore.QRectF. moveTopRight ( p ) ¶

参数: p – QPointF

Moves the rectangle, leaving the top-right corner at the given position . The rectangle’s size is unchanged.

另请参阅

setTopRight() moveTop() moveRight()

PySide2.QtCore.QRectF. normalized ( ) ¶

返回类型: QRectF

Returns a normalized rectangle; i.e., a rectangle that has a non-negative width and height.

若 width() < 0 the function swaps the left and right corners, and it swaps the top and bottom corners if height() < 0.

另请参阅

isValid() isEmpty()

PySide2.QtCore.QRectF. __ne__ ( arg__2 ) ¶

参数: arg__2 – QRectF
返回类型: bool

PySide2.QtCore.QRectF. __ne__ ( r2 ) ¶

参数: r2 – QRectF
返回类型: bool

PySide2.QtCore.QRectF. __and__ ( r ) ¶

参数: r – QRectF
返回类型: QRectF

PySide2.QtCore.QRectF. __iand__ ( r ) ¶

参数: r – QRectF
返回类型: QRectF

PySide2.QtCore.QRectF. __add__ ( lhs ) ¶

参数: lhs – QMarginsF
返回类型: QRectF

PySide2.QtCore.QRectF. __add__ ( rhs ) ¶

参数: rhs – QMarginsF
返回类型: QRectF

PySide2.QtCore.QRectF. __iadd__ ( margins ) ¶

参数: margins – QMarginsF
返回类型: QRectF

添加 margins to the rectangle, growing it.

另请参阅

marginsAdded() marginsRemoved() operator-=()

PySide2.QtCore.QRectF. __sub__ ( rhs ) ¶

参数: rhs – QMarginsF
返回类型: QRectF

PySide2.QtCore.QRectF. __isub__ ( margins ) ¶

参数: margins – QMarginsF
返回类型: QRectF

Returns a rectangle shrunk by the margins .

另请参阅

marginsRemoved() operator+=() marginsAdded()

PySide2.QtCore.QRectF. __eq__ ( arg__2 ) ¶

参数: arg__2 – QRectF
返回类型: bool

PySide2.QtCore.QRectF. __eq__ ( r2 ) ¶

参数: r2 – QRectF
返回类型: bool

PySide2.QtCore.QRectF. __or__ ( r ) ¶

参数: r – QRectF
返回类型: QRectF

Returns the bounding rectangle of this rectangle and the given rectangle .

另请参阅

united() operator|=()

PySide2.QtCore.QRectF. __ior__ ( r ) ¶

参数: r – QRectF
返回类型: QRectF

Unites this rectangle with the given rectangle .

另请参阅

united() operator|()

PySide2.QtCore.QRectF. right ( ) ¶

返回类型: qreal

Returns the x-coordinate of the rectangle’s right edge.

另请参阅

setRight() topRight() bottomRight()

PySide2.QtCore.QRectF. setBottom ( pos ) ¶

参数: pos – qreal

Sets the bottom edge of the rectangle to the given y coordinate. May change the height, but will never change the top edge of the rectangle.

另请参阅

bottom() moveBottom()

PySide2.QtCore.QRectF. setBottomLeft ( p ) ¶

参数: p – QPointF

Set the bottom-left corner of the rectangle to the given position . May change the size, but will never change the top-right corner of the rectangle.

另请参阅

bottomLeft() moveBottomLeft()

PySide2.QtCore.QRectF. setBottomRight ( p ) ¶

参数: p – QPointF

Set the bottom-right corner of the rectangle to the given position . May change the size, but will never change the top-left corner of the rectangle.

另请参阅

bottomRight() moveBottomRight()

PySide2.QtCore.QRectF. setCoords ( x1 , y1 , x2 , y2 ) ¶

参数

x1 – qreal
y1 – qreal
x2 – qreal
y2 – qreal

Sets the coordinates of the rectangle’s top-left corner to ( x1 , y1 ), and the coordinates of its bottom-right corner to ( x2 , y2 ).

另请参阅

getCoords() setRect()

PySide2.QtCore.QRectF. setHeight ( h ) ¶

参数: h – qreal

Sets the height of the rectangle to the given height . The bottom edge is changed, but not the top one.

另请参阅

height() setSize()

PySide2.QtCore.QRectF. setLeft ( pos ) ¶

参数: pos – qreal

Sets the left edge of the rectangle to the given x coordinate. May change the width, but will never change the right edge of the rectangle.

相当于 setX() .

另请参阅

left() moveLeft()

PySide2.QtCore.QRectF. setRect ( x , y , w , h ) ¶

参数

x – qreal
y – qreal
w – qreal
h – qreal

Sets the coordinates of the rectangle’s top-left corner to ( x , y ), and its size to the given width and height .

另请参阅

getRect() setCoords()

PySide2.QtCore.QRectF. setRight ( pos ) ¶

参数: pos – qreal

Sets the right edge of the rectangle to the given x coordinate. May change the width, but will never change the left edge of the rectangle.

另请参阅

right() moveRight()

PySide2.QtCore.QRectF. setSize ( s ) ¶

参数: s – QSizeF

Sets the size of the rectangle to the given size . The top-left corner is not moved.

另请参阅

size() setWidth() setHeight()

PySide2.QtCore.QRectF. setTop ( pos ) ¶

参数: pos – qreal

Sets the top edge of the rectangle to the given y coordinate. May change the height, but will never change the bottom edge of the rectangle.

相当于 setY() .

另请参阅

top() moveTop()

PySide2.QtCore.QRectF. setTopLeft ( p ) ¶

参数: p – QPointF

Set the top-left corner of the rectangle to the given position . May change the size, but will never change the bottom-right corner of the rectangle.

另请参阅

topLeft() moveTopLeft()

PySide2.QtCore.QRectF. setTopRight ( p ) ¶

参数: p – QPointF

Set the top-right corner of the rectangle to the given position . May change the size, but will never change the bottom-left corner of the rectangle.

另请参阅

topRight() moveTopRight()

PySide2.QtCore.QRectF. setWidth ( w ) ¶

参数: w – qreal

Sets the width of the rectangle to the given width . The right edge is changed, but not the left one.

另请参阅

width() setSize()

PySide2.QtCore.QRectF. setX ( pos ) ¶

参数: pos – qreal

Sets the left edge of the rectangle to the given x coordinate. May change the width, but will never change the right edge of the rectangle.

相当于 setLeft() .

另请参阅

x() setY() setTopLeft()

PySide2.QtCore.QRectF. setY ( pos ) ¶

参数: pos – qreal

Sets the top edge of the rectangle to the given y coordinate. May change the height, but will never change the bottom edge of the rectangle.

相当于 setTop() .

另请参阅

y() setX() setTopLeft()

PySide2.QtCore.QRectF. size ( ) ¶

返回类型: QSizeF

Returns the size of the rectangle.

另请参阅

setSize() width() height()

PySide2.QtCore.QRectF. toAlignedRect ( ) ¶

返回类型: QRect

返回 QRect based on the values of this rectangle that is the smallest possible integer rectangle that completely contains this rectangle.

另请参阅

toRect()

PySide2.QtCore.QRectF. toRect ( ) ¶

返回类型: QRect

返回 QRect based on the values of this rectangle. Note that the coordinates in the returned rectangle are rounded to the nearest integer.

另请参阅

QRectF() toAlignedRect()

PySide2.QtCore.QRectF. top ( ) ¶

返回类型: qreal

Returns the y-coordinate of the rectangle’s top edge. Equivalent to y() .

另请参阅

setTop() topLeft() topRight()

PySide2.QtCore.QRectF. topLeft ( ) ¶

返回类型: QPointF

Returns the position of the rectangle’s top-left corner.

另请参阅

setTopLeft() top() left()

PySide2.QtCore.QRectF. topRight ( ) ¶

返回类型: QPointF

Returns the position of the rectangle’s top-right corner.

另请参阅

setTopRight() top() right()

PySide2.QtCore.QRectF. translate ( p ) ¶

参数: p – QPointF

这是重载函数。

Moves the rectangle offset . x() along the x axis and offset . y() along the y axis, relative to the current position.

PySide2.QtCore.QRectF. translate ( dx , dy ) ¶

参数

dx – qreal
dy – qreal

Moves the rectangle dx along the x-axis and dy along the y-axis, relative to the current position. Positive values move the rectangle to the right and downwards.

另请参阅

moveTopLeft() moveTo() translated()

PySide2.QtCore.QRectF. translated ( p ) ¶

参数: p – QPointF
返回类型: QRectF

这是重载函数。

Returns a copy of the rectangle that is translated offset . x() along the x axis and offset . y() along the y axis, relative to the current position.

PySide2.QtCore.QRectF. translated ( dx , dy ) ¶

参数

dx – qreal
dy – qreal

返回类型

QRectF

Returns a copy of the rectangle that is translated dx along the x axis and dy along the y axis, relative to the current position. Positive values move the rectangle to the right and down.

另请参阅

translate()

PySide2.QtCore.QRectF. transposed ( ) ¶

返回类型: QRectF

Returns a copy of the rectangle that has its width and height exchanged:

												QRectF r = {1.5, 5.1, 4.2, 2.4};
r = r.transposed(); // r == {1.5, 5.1, 2.4, 4.2}

另请参阅

transposed()

PySide2.QtCore.QRectF. united ( other ) ¶

参数: other – QRectF
返回类型: QRectF

Returns the bounding rectangle of this rectangle and the given rectangle .

另请参阅

intersected()

PySide2.QtCore.QRectF. width ( ) ¶

返回类型: qreal

Returns the width of the rectangle.

另请参阅

setWidth() height() size()

PySide2.QtCore.QRectF. x ( ) ¶

返回类型: qreal

Returns the x-coordinate of the rectangle’s left edge. Equivalent to left() .

另请参阅

setX() y() topLeft()

PySide2.QtCore.QRectF. y ( ) ¶

返回类型: qreal

Returns the y-coordinate of the rectangle’s top edge. Equivalent to top() .

另请参阅

setY() x() topLeft()


Logical representation	One pixel wide pen

Two pixel wide pen	Three pixel wide pen

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QRectF ¶

概要 ¶

函数 ¶

详细描述 ¶

渲染 ¶

坐标 ¶