QRectF¶
The QRectF
class defines a rectangle in the plane using floating point precision. More…
Synopsis¶
Functions¶
def
__add__
(, rhs)def
__add__
(lhs)def
__and__
(r)def
__eq__
(, r2)def
__iadd__
(margins)def
__iand__
(r)def
__ior__
(r)def
__isub__
(margins)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
()
Detailed Description¶
A rectangle is normally expressed as a topleft 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
and a QSizeF
. The following code creates two identical rectangles.
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).
The 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.
The size()
function returns the rectangle’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()
.
The 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:
The 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
.
Finally, QRectF
objects can be streamed as well as compared.
Rendering¶
When using an antialiased
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
Coordinates¶
The 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 ycoordinate 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.
In addition, QRectF
provides the getCoords()
function which extracts the position of the rectangle’s topleft and bottomright corner, and the getRect()
function which extracts the rectangle’s topleft corner, width and height. Use the setCoords()
and setRect()
function to manipulate the rectangle’s coordinates and dimensions in one go.
See also
QRect
QRegion

class
PySide6.QtCore.
QRectF
¶ PySide6.QtCore.QRectF(topleft, bottomRight)
PySide6.QtCore.QRectF(topleft, size)
PySide6.QtCore.QRectF(rect)
PySide6.QtCore.QRectF(QRectF)
PySide6.QtCore.QRectF(left, top, width, height)
 Parameters
left – float
top – float
rect –
PySide6.QtCore.QRect
QRectF –
PySide6.QtCore.QRectF
width – float
topleft –
PySide6.QtCore.QPointF
size –
PySide6.QtCore.QSizeF
bottomRight –
PySide6.QtCore.QPointF
height – float
Constructs a null rectangle.
See also
Constructs a QRectF
rectangle from the given QRect
rectangle
.
See also
Constructs a rectangle with (x
, y
) as its topleft corner and the given width
and height
.
See also

PySide6.QtCore.QRectF.
__reduce__
()¶  Return type
object

PySide6.QtCore.QRectF.
__repr__
()¶  Return type
object

PySide6.QtCore.QRectF.
adjust
(x1, y1, x2, y2)¶  Parameters
x1 – float
y1 – float
x2 – float
y2 – float
Adds dx1
, dy1
, dx2
and dy2
respectively to the existing coordinates of the rectangle.
See also

PySide6.QtCore.QRectF.
adjusted
(x1, y1, x2, y2)¶  Parameters
x1 – float
y1 – float
x2 – float
y2 – float
 Return type
Returns a new rectangle with dx1
, dy1
, dx2
and dy2
added respectively to the existing coordinates of this rectangle.
See also

PySide6.QtCore.QRectF.
bottom
()¶  Return type
float
Returns the ycoordinate of the rectangle’s bottom edge.
See also

PySide6.QtCore.QRectF.
bottomLeft
()¶  Return type
Returns the position of the rectangle’s bottomleft corner.
See also

PySide6.QtCore.QRectF.
bottomRight
()¶  Return type
Returns the position of the rectangle’s bottomright corner.
See also

PySide6.QtCore.QRectF.
center
()¶  Return type
Returns the center point of the rectangle.
See also

PySide6.QtCore.QRectF.
contains
(r)¶  Parameters
 Return type
bool

PySide6.QtCore.QRectF.
contains
(x, y)  Parameters
x – float
y – float
 Return type
bool
This is an overloaded function.
Returns true
if the point (x
, y
) is inside or on the edge of the rectangle; otherwise returns false
.

PySide6.QtCore.QRectF.
contains
(p)  Parameters
 Return type
bool

PySide6.QtCore.QRectF.
getCoords
()¶
Extracts the position of the rectangle’s topleft corner to *``x1`` and *``y1``, and the position of the bottomright corner to *``x2`` and *``y2``.
See also

PySide6.QtCore.QRectF.
getRect
()¶
Extracts the position of the rectangle’s topleft corner to *``x`` and *``y``, and its dimensions to *``width`` and *``height``.
See also

PySide6.QtCore.QRectF.
height
()¶  Return type
float
Returns the height of the rectangle.
See also

PySide6.QtCore.QRectF.
intersected
(other)¶  Parameters
other –
PySide6.QtCore.QRectF
 Return type
Returns the intersection of this rectangle and the given rectangle
. Note that r.intersected(s)
is equivalent to r & s
.
See also
intersects()
united()
operator&=()

PySide6.QtCore.QRectF.
intersects
(r)¶  Parameters
 Return type
bool
Returns true
if this rectangle intersects with the given rectangle
(i.e. there is a nonempty area of overlap between them), otherwise returns false
.
The intersection rectangle can be retrieved using the intersected()
function.
See also

PySide6.QtCore.QRectF.
isEmpty
()¶  Return type
bool
Returns true
if the rectangle is empty, otherwise returns false
.
An empty rectangle has width()
<= 0 or height()
<= 0. An empty rectangle is not valid (i.e., == ! isValid()
).
Use the normalized()
function to retrieve a rectangle where the corners are swapped.
See also

PySide6.QtCore.QRectF.
isNull
()¶  Return type
bool
Returns true
if the rectangle is a null rectangle, otherwise returns false
.
A null rectangle has both the width and the height set to 0. A null rectangle is also empty, and hence not valid.

PySide6.QtCore.QRectF.
isValid
()¶  Return type
bool
Returns true
if the rectangle is valid, otherwise returns false
.
A valid rectangle has a width()
> 0 and height()
> 0. Note that nontrivial operations like intersections are not defined for invalid rectangles. A valid rectangle is not empty (i.e., == ! isEmpty()
).
See also

PySide6.QtCore.QRectF.
left
()¶  Return type
float
Returns the xcoordinate of the rectangle’s left edge. Equivalent to x()
.
See also

PySide6.QtCore.QRectF.
marginsAdded
(margins)¶  Parameters
margins –
PySide6.QtCore.QMarginsF
 Return type
Returns a rectangle grown by the margins
.
See also
operator+=()
marginsRemoved()
operator=()

PySide6.QtCore.QRectF.
marginsRemoved
(margins)¶  Parameters
margins –
PySide6.QtCore.QMarginsF
 Return type
Removes the margins
from the rectangle, shrinking it.
See also
marginsAdded()
operator+=()
operator=()

PySide6.QtCore.QRectF.
moveBottom
(pos)¶  Parameters
pos – float
Moves the rectangle vertically, leaving the rectangle’s bottom edge at the given y
coordinate. The rectangle’s size is unchanged.
See also

PySide6.QtCore.QRectF.
moveBottomLeft
(p)¶  Parameters
Moves the rectangle, leaving the bottomleft corner at the given position
. The rectangle’s size is unchanged.
See also

PySide6.QtCore.QRectF.
moveBottomRight
(p)¶  Parameters
Moves the rectangle, leaving the bottomright corner at the given position
. The rectangle’s size is unchanged.
See also

PySide6.QtCore.QRectF.
moveCenter
(p)¶  Parameters
Moves the rectangle, leaving the center point at the given position
. The rectangle’s size is unchanged.
See also

PySide6.QtCore.QRectF.
moveLeft
(pos)¶  Parameters
pos – float
Moves the rectangle horizontally, leaving the rectangle’s left edge at the given x
coordinate. The rectangle’s size is unchanged.
See also

PySide6.QtCore.QRectF.
moveRight
(pos)¶  Parameters
pos – float
Moves the rectangle horizontally, leaving the rectangle’s right edge at the given x
coordinate. The rectangle’s size is unchanged.
See also

PySide6.QtCore.QRectF.
moveTo
(p)¶  Parameters
This is an overloaded function.
Moves the rectangle, leaving the topleft corner at the given position
.

PySide6.QtCore.QRectF.
moveTo
(x, y)  Parameters
x – float
y – float
Moves the rectangle, leaving the topleft corner at the given position (x
, y
). The rectangle’s size is unchanged.
See also

PySide6.QtCore.QRectF.
moveTop
(pos)¶  Parameters
pos – float
Moves the rectangle vertically, leaving the rectangle’s top line at the given y
coordinate. The rectangle’s size is unchanged.
See also

PySide6.QtCore.QRectF.
moveTopLeft
(p)¶  Parameters
Moves the rectangle, leaving the topleft corner at the given position
. The rectangle’s size is unchanged.
See also

PySide6.QtCore.QRectF.
moveTopRight
(p)¶  Parameters
Moves the rectangle, leaving the topright corner at the given position
. The rectangle’s size is unchanged.
See also

PySide6.QtCore.QRectF.
normalized
()¶  Return type
Returns a normalized rectangle; i.e., a rectangle that has a nonnegative width and height.
If width()
< 0 the function swaps the left and right corners, and it swaps the top and bottom corners if height()
< 0.

PySide6.QtCore.QRectF.
__ne__
(r2)¶  Parameters
 Return type
bool

PySide6.QtCore.QRectF.
__and__
(r)¶  Parameters
 Return type

PySide6.QtCore.QRectF.
__iand__
(r)¶  Parameters
 Return type

PySide6.QtCore.QRectF.
__add__
(lhs)¶  Parameters
lhs –
PySide6.QtCore.QMarginsF
 Return type

PySide6.QtCore.QRectF.
__add__
(rhs)  Parameters
rhs –
PySide6.QtCore.QMarginsF
 Return type

PySide6.QtCore.QRectF.
__iadd__
(margins)¶  Parameters
margins –
PySide6.QtCore.QMarginsF
 Return type
Adds the margins
to the rectangle, growing it.
See also
marginsAdded()
marginsRemoved()
operator=()

PySide6.QtCore.QRectF.
__sub__
(rhs)¶  Parameters
rhs –
PySide6.QtCore.QMarginsF
 Return type

PySide6.QtCore.QRectF.
__isub__
(margins)¶  Parameters
margins –
PySide6.QtCore.QMarginsF
 Return type
Returns a rectangle shrunk by the margins
.
See also
marginsRemoved()
operator+=()
marginsAdded()

PySide6.QtCore.QRectF.
__eq__
(r2)¶  Parameters
 Return type
bool

PySide6.QtCore.QRectF.
__or__
(r)¶  Parameters
 Return type
Returns the bounding rectangle of this rectangle and the given rectangle
.
See also
united()
operator=()

PySide6.QtCore.QRectF.
__ior__
(r)¶  Parameters
 Return type
Unites this rectangle with the given rectangle
.
See also
united()
operator()

PySide6.QtCore.QRectF.
right
()¶  Return type
float
Returns the xcoordinate of the rectangle’s right edge.
See also

PySide6.QtCore.QRectF.
setBottom
(pos)¶  Parameters
pos – float
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.
See also

PySide6.QtCore.QRectF.
setBottomLeft
(p)¶  Parameters
Set the bottomleft corner of the rectangle to the given position
. May change the size, but will never change the topright corner of the rectangle.
See also

PySide6.QtCore.QRectF.
setBottomRight
(p)¶  Parameters
Set the bottomright corner of the rectangle to the given position
. May change the size, but will never change the topleft corner of the rectangle.
See also

PySide6.QtCore.QRectF.
setCoords
(x1, y1, x2, y2)¶  Parameters
x1 – float
y1 – float
x2 – float
y2 – float
Sets the coordinates of the rectangle’s topleft corner to (x1
, y1
), and the coordinates of its bottomright corner to (x2
, y2
).
See also

PySide6.QtCore.QRectF.
setHeight
(h)¶  Parameters
h – float
Sets the height of the rectangle to the given height
. The bottom edge is changed, but not the top one.

PySide6.QtCore.QRectF.
setLeft
(pos)¶  Parameters
pos – float
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.
Equivalent to setX()
.
See also

PySide6.QtCore.QRectF.
setRect
(x, y, w, h)¶  Parameters
x – float
y – float
w – float
h – float
Sets the coordinates of the rectangle’s topleft corner to (x
, y
), and its size to the given width
and height
.
See also

PySide6.QtCore.QRectF.
setRight
(pos)¶  Parameters
pos – float
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.
See also

PySide6.QtCore.QRectF.
setSize
(s)¶  Parameters
Sets the size of the rectangle to the given size
. The topleft corner is not moved.
See also

PySide6.QtCore.QRectF.
setTop
(pos)¶  Parameters
pos – float
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.
Equivalent to setY()
.

PySide6.QtCore.QRectF.
setTopLeft
(p)¶  Parameters
Set the topleft corner of the rectangle to the given position
. May change the size, but will never change the bottomright corner of the rectangle.
See also

PySide6.QtCore.QRectF.
setTopRight
(p)¶  Parameters
Set the topright corner of the rectangle to the given position
. May change the size, but will never change the bottomleft corner of the rectangle.
See also

PySide6.QtCore.QRectF.
setWidth
(w)¶  Parameters
w – float
Sets the width of the rectangle to the given width
. The right edge is changed, but not the left one.

PySide6.QtCore.QRectF.
setX
(pos)¶  Parameters
pos – float
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.
Equivalent to setLeft()
.
See also

PySide6.QtCore.QRectF.
setY
(pos)¶  Parameters
pos – float
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.
Equivalent to setTop()
.
See also

PySide6.QtCore.QRectF.
size
()¶  Return type
Returns the size of the rectangle.

PySide6.QtCore.QRectF.
toAlignedRect
()¶  Return type
Returns a QRect
based on the values of this rectangle that is the smallest possible integer rectangle that completely contains this rectangle.
See also

PySide6.QtCore.QRectF.
toRect
()¶  Return type
Returns a QRect
based on the values of this rectangle. Note that the coordinates in the returned rectangle are rounded to the nearest integer.
See also
QRectF()
toAlignedRect()

PySide6.QtCore.QRectF.
top
()¶  Return type
float
Returns the ycoordinate of the rectangle’s top edge. Equivalent to y()
.
See also

PySide6.QtCore.QRectF.
topLeft
()¶  Return type
Returns the position of the rectangle’s topleft corner.
See also

PySide6.QtCore.QRectF.
topRight
()¶  Return type
Returns the position of the rectangle’s topright corner.
See also

PySide6.QtCore.QRectF.
translate
(p)¶  Parameters
This is an overloaded function.
Moves the rectangle offset
. x()
along the x axis and offset
. y()
along the y axis, relative to the current position.

PySide6.QtCore.QRectF.
translate
(dx, dy)  Parameters
dx – float
dy – float
Moves the rectangle dx
along the xaxis and dy
along the yaxis, relative to the current position. Positive values move the rectangle to the right and downwards.
See also

PySide6.QtCore.QRectF.
translated
(p)¶  Parameters
 Return type
This is an overloaded function.
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.

PySide6.QtCore.QRectF.
translated
(dx, dy)  Parameters
dx – float
dy – float
 Return type
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.
See also

PySide6.QtCore.QRectF.
transposed
()¶  Return type
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}See also

PySide6.QtCore.QRectF.
united
(other)¶  Parameters
other –
PySide6.QtCore.QRectF
 Return type
Returns the bounding rectangle of this rectangle and the given rectangle
.
See also

PySide6.QtCore.QRectF.
width
()¶  Return type
float
Returns the width of the rectangle.
See also

PySide6.QtCore.QRectF.
x
()¶  Return type
float
Returns the xcoordinate of the rectangle’s left edge. Equivalent to left()
.

PySide6.QtCore.QRectF.
y
()¶  Return type
float
Returns the ycoordinate of the rectangle’s top edge. Equivalent to top()
.
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