QRectF¶
Synopsis¶
Functions¶
- def __and__ (r)
- def __eq__ (, arg__2)
- def __iand__ (r)
- def __ior__ (r)
- def __ne__ (, arg__2)
- def __or__ (r)
- def __reduce__ ()
- def __repr__ ()
- 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 intersect (r)
- def intersected (other)
- def intersects (r)
- def isEmpty ()
- def isNull ()
- def isValid ()
- def left ()
- def moveBottom (pos)
- def moveBottomLeft (p)
- def moveBottomRight (p)
- def moveCenter (p)
- def moveLeft (pos)
- def moveRight (pos)
- def moveTo (p)
- def moveTo (x, t)
- 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 unite (r)
- def united (other)
- def width ()
- def x ()
- def y ()
Detailed Description¶
The PySide.QtCore.QRectF class defines a rectangle in the plane using floating point precision.
A rectangle is normally expressed as an upper-left corner and a size. The size (width and height) of a PySide.QtCore.QRectF is always equivalent to the mathematical rectangle that forms the basis for its rendering.
A PySide.QtCore.QRectF can be constructed with a set of left, top, width and height integers, or from a PySide.QtCore.QPoint and a PySide.QtCore.QSize . 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 PySide.QtCore.QRectF from a PySide.QtCore.QRect , and a corresponding PySide.QtCore.QRectF.toRect() function that returns a PySide.QtCore.QRect object based on the values of this rectangle (note that the coordinates in the returned rectangle are rounded to the nearest integer).
The PySide.QtCore.QRectF class provides a collection of functions that return the various rectangle coordinates, and enable manipulation of these. PySide.QtCore.QRectF also provide functions to move the rectangle relative to the various coordinates. In addition there is a PySide.QtCore.QRectF.moveTo() function that moves the rectangle, leaving its top left corner at the given coordinates. Alternatively, the PySide.QtCore.QRectF.translate() function moves the rectangle the given offset relative to the current position, and the PySide.QtCore.QRectF.translated() function returns a translated copy of this rectangle.
The PySide.QtCore.QRectF.size() function returns the rectange’s dimensions as a PySide.QtCore.QSize . The dimensions can also be retrieved separately using the PySide.QtCore.QRectF.width() and PySide.QtCore.QRectF.height() functions. To manipulate the dimensions use the PySide.QtCore.QRectF.setSize() , PySide.QtCore.QRectF.setWidth() or PySide.QtCore.QRectF.setHeight() functions. Alternatively, the size can be changed by applying either of the functions setting the rectangle coordinates, for example, PySide.QtCore.QRectF.setBottom() or PySide.QtCore.QRectF.setRight() .
The PySide.QtCore.QRectF.contains() function tells whether a given point is inside the rectangle or not, and the PySide.QtCore.QRectF.intersects() function returns true if this rectangle intersects with a given rectangle (otherwise false). The PySide.QtCore.QRectF class also provides the PySide.QtCore.QRectF.intersected() function which returns the intersection rectangle, and the PySide.QtCore.QRectF.united() function which returns the rectangle that encloses the given rectangle and this:
PySide.QtCore.QRectF.intersected() PySide.QtCore.QRectF.united() The PySide.QtCore.QRectF.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 PySide.QtCore.QRectF.isValid() function returns true if both width and height is larger than 0. A null rectangle ( PySide.QtCore.QRectF.isNull() == true) on the other hand, has both width and height set to 0.
Note that due to the way PySide.QtCore.QRect and PySide.QtCore.QRectF are defined, an empty PySide.QtCore.QRectF is defined in essentially the same way as PySide.QtCore.QRect .
Finally, PySide.QtCore.QRectF objects can be streamed as well as compared.
Rendering¶
When using an anti-aliased painter, the boundary line of a PySide.QtCore.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 PySide.QtCore.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 PySide.QtCore.QRectF class provides a collection of functions that return the various rectangle coordinates, and enable manipulation of these. PySide.QtCore.QRectF also provide functions to move the rectangle relative to the various coordinates.
For example: the PySide.QtCore.QRectF.bottom() , PySide.QtCore.QRectF.setBottom() and PySide.QtCore.QRectF.moveBottom() functions: PySide.QtCore.QRectF.bottom() returns the y-coordinate of the rectangle’s bottom edge, PySide.QtCore.QRectF.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 PySide.QtCore.QRectF.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 PySide.QtCore.QRectF.adjust() function, as well as retrieve a new rectangle based on adjustments of the original one using the PySide.QtCore.QRectF.adjusted() function. If either of the width and height is negative, use the PySide.QtCore.QRectF.normalized() function to retrieve a rectangle where the corners are swapped.
In addition, PySide.QtCore.QRectF provides the PySide.QtCore.QRectF.getCoords() function which extracts the position of the rectangle’s top-left and bottom-right corner, and the PySide.QtCore.QRectF.getRect() function which extracts the rectangle’s top-left corner, width and height. Use the PySide.QtCore.QRectF.setCoords() and PySide.QtCore.QRectF.setRect() function to manipulate the rectangle’s coordinates and dimensions in one go.
See also
- class PySide.QtCore.QRectF¶
- class PySide.QtCore.QRectF(topleft, bottomRight)
- class PySide.QtCore.QRectF(topleft, size)
- class PySide.QtCore.QRectF(rect)
- class PySide.QtCore.QRectF(QRectF)
- class PySide.QtCore.QRectF(left, top, width, height)
Parameters: - width – PySide.QtCore.qreal
- size – PySide.QtCore.QSizeF
- bottomRight – PySide.QtCore.QPointF
- rect – PySide.QtCore.QRect
- QRectF – PySide.QtCore.QRectF
- topleft – PySide.QtCore.QPointF
- left – PySide.QtCore.qreal
- height – PySide.QtCore.qreal
- top – PySide.QtCore.qreal
Constructs a null rectangle.
See also
Constructs a rectangle with the given topLeft and bottomRight corners.
Constructs a rectangle with the given topLeft corner and the given size .
Constructs a PySide.QtCore.QRectF rectangle from the given PySide.QtCore.QRect rectangle .
See also
Constructs a rectangle with (x , y ) as its top-left corner and the given width and height .
See also
- PySide.QtCore.QRectF.__reduce__()¶
Return type: PyObject
- PySide.QtCore.QRectF.__repr__()¶
Return type: PyObject
- PySide.QtCore.QRectF.adjust(x1, y1, x2, y2)¶
Parameters: - x1 – PySide.QtCore.qreal
- y1 – PySide.QtCore.qreal
- x2 – PySide.QtCore.qreal
- y2 – PySide.QtCore.qreal
Adds dx1 , dy1 , dx2 and dy2 respectively to the existing coordinates of the rectangle.
- PySide.QtCore.QRectF.adjusted(x1, y1, x2, y2)¶
Parameters: - x1 – PySide.QtCore.qreal
- y1 – PySide.QtCore.qreal
- x2 – PySide.QtCore.qreal
- y2 – PySide.QtCore.qreal
Return type: Returns a new rectangle with dx1 , dy1 , dx2 and dy2 added respectively to the existing coordinates of this rectangle.
See also
- PySide.QtCore.QRectF.bottom()¶
Return type: PySide.QtCore.qreal Returns the y-coordinate of the rectangle’s bottom edge.
- PySide.QtCore.QRectF.bottomLeft()¶
Return type: PySide.QtCore.QPointF Returns the position of the rectangle’s bottom-left corner.
- PySide.QtCore.QRectF.bottomRight()¶
Return type: PySide.QtCore.QPointF Returns the position of the rectangle’s bottom-right corner.
- PySide.QtCore.QRectF.center()¶
Return type: PySide.QtCore.QPointF Returns the center point of the rectangle.
See also
- PySide.QtCore.QRectF.contains(x, y)¶
Parameters: - x – PySide.QtCore.qreal
- y – PySide.QtCore.qreal
Return type: PySide.QtCore.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.
- PySide.QtCore.QRectF.contains(p)
Parameters: p – PySide.QtCore.QPointF Return type: PySide.QtCore.bool Returns true if the given point is inside or on the edge of the rectangle; otherwise returns false.
See also
- PySide.QtCore.QRectF.contains(r)
Parameters: r – PySide.QtCore.QRectF Return type: PySide.QtCore.bool This is an overloaded function.
Returns true if the given rectangle is inside this rectangle; otherwise returns false.
- PySide.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`` .
- PySide.QtCore.QRectF.getRect()¶
Extracts the position of the rectangle’s top-left corner to *``x`` and *``y`` , and its dimensions to *``width`` and *``height`` .
- PySide.QtCore.QRectF.height()¶
Return type: PySide.QtCore.qreal Returns the height of the rectangle.
- PySide.QtCore.QRectF.intersect(r)¶
Parameters: r – PySide.QtCore.QRectF Return type: PySide.QtCore.QRectF Use intersected(rectangle ) instead.
- PySide.QtCore.QRectF.intersected(other)¶
Parameters: other – PySide.QtCore.QRectF Return type: PySide.QtCore.QRectF Returns the intersection of this rectangle and the given rectangle . Note that r.intersected(s) is equivalent to r & s .
See also
PySide.QtCore.QRectF.intersects() PySide.QtCore.QRectF.united() PySide.QtCore.QRectF.operator&=()
- PySide.QtCore.QRectF.intersects(r)¶
Parameters: r – PySide.QtCore.QRectF Return type: PySide.QtCore.bool Returns 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 PySide.QtCore.QRectF.intersected() function.
See also
- PySide.QtCore.QRectF.isEmpty()¶
Return type: PySide.QtCore.bool Returns true if the rectangle is empty, otherwise returns false.
An empty rectangle has PySide.QtCore.QRectF.width() <= 0 or PySide.QtCore.QRectF.height() <= 0. An empty rectangle is not valid (i.e., PySide.QtCore.QRectF.isEmpty() == ! PySide.QtCore.QRectF.isValid() ).
Use the PySide.QtCore.QRectF.normalized() function to retrieve a rectangle where the corners are swapped.
- PySide.QtCore.QRectF.isNull()¶
Return type: PySide.QtCore.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.
- PySide.QtCore.QRectF.isValid()¶
Return type: PySide.QtCore.bool Returns true if the rectangle is valid, otherwise returns false.
A valid rectangle has a PySide.QtCore.QRectF.width() > 0 and PySide.QtCore.QRectF.height() > 0. Note that non-trivial operations like intersections are not defined for invalid rectangles. A valid rectangle is not empty (i.e., PySide.QtCore.QRectF.isValid() == ! PySide.QtCore.QRectF.isEmpty() ).
- PySide.QtCore.QRectF.left()¶
Return type: PySide.QtCore.qreal Returns the x-coordinate of the rectangle’s left edge. Equivalent to PySide.QtCore.QRectF.x() .
- PySide.QtCore.QRectF.moveBottom(pos)¶
Parameters: pos – PySide.QtCore.qreal Moves the rectangle vertically, leaving the rectangle’s bottom edge at the given y coordinate. The rectangle’s size is unchanged.
- PySide.QtCore.QRectF.moveBottomLeft(p)¶
Parameters: p – PySide.QtCore.QPointF Moves the rectangle, leaving the bottom-left corner at the given position . The rectangle’s size is unchanged.
- PySide.QtCore.QRectF.moveBottomRight(p)¶
Parameters: p – PySide.QtCore.QPointF Moves the rectangle, leaving the bottom-right corner at the given position . The rectangle’s size is unchanged.
- PySide.QtCore.QRectF.moveCenter(p)¶
Parameters: p – PySide.QtCore.QPointF Moves the rectangle, leaving the center point at the given position . The rectangle’s size is unchanged.
See also
- PySide.QtCore.QRectF.moveLeft(pos)¶
Parameters: pos – PySide.QtCore.qreal Moves the rectangle horizontally, leaving the rectangle’s left edge at the given x coordinate. The rectangle’s size is unchanged.
- PySide.QtCore.QRectF.moveRight(pos)¶
Parameters: pos – PySide.QtCore.qreal Moves the rectangle horizontally, leaving the rectangle’s right edge at the given x coordinate. The rectangle’s size is unchanged.
- PySide.QtCore.QRectF.moveTo(x, t)¶
Parameters: - x – PySide.QtCore.qreal
- t – PySide.QtCore.qreal
Moves the rectangle, leaving the top-left corner at the given position (x , y ). The rectangle’s size is unchanged.
- PySide.QtCore.QRectF.moveTo(p)
Parameters: p – PySide.QtCore.QPointF This is an overloaded function.
Moves the rectangle, leaving the top-left corner at the given position .
- PySide.QtCore.QRectF.moveTop(pos)¶
Parameters: pos – PySide.QtCore.qreal Moves the rectangle vertically, leaving the rectangle’s top line at the given y coordinate. The rectangle’s size is unchanged.
- PySide.QtCore.QRectF.moveTopLeft(p)¶
Parameters: p – PySide.QtCore.QPointF Moves the rectangle, leaving the top-left corner at the given position . The rectangle’s size is unchanged.
- PySide.QtCore.QRectF.moveTopRight(p)¶
Parameters: p – PySide.QtCore.QPointF Moves the rectangle, leaving the top-right corner at the given position . The rectangle’s size is unchanged.
- PySide.QtCore.QRectF.normalized()¶
Return type: PySide.QtCore.QRectF Returns a normalized rectangle; i.e., a rectangle that has a non-negative width and height.
If PySide.QtCore.QRectF.width() < 0 the function swaps the left and right corners, and it swaps the top and bottom corners if PySide.QtCore.QRectF.height() < 0.
- PySide.QtCore.QRectF.__ne__(arg__2)¶
Parameters: arg__2 – PySide.QtCore.QRectF Return type: PySide.QtCore.bool
- PySide.QtCore.QRectF.__and__(r)¶
Parameters: r – PySide.QtCore.QRectF Return type: PySide.QtCore.QRectF Returns the intersection of this rectangle and the given rectangle . Returns an empty rectangle if there is no intersection.
See also
PySide.QtCore.QRectF.operator&=() PySide.QtCore.QRectF.intersected()
- PySide.QtCore.QRectF.__iand__(r)¶
Parameters: r – PySide.QtCore.QRectF Return type: PySide.QtCore.QRectF Intersects this rectangle with the given rectangle .
See also
PySide.QtCore.QRectF.intersected() PySide.QtCore.QRectF.operator|=()
- PySide.QtCore.QRectF.__eq__(arg__2)¶
Parameters: arg__2 – PySide.QtCore.QRectF Return type: PySide.QtCore.bool
- PySide.QtCore.QRectF.__or__(r)¶
Parameters: r – PySide.QtCore.QRectF Return type: PySide.QtCore.QRectF Returns the bounding rectangle of this rectangle and the given rectangle .
See also
PySide.QtCore.QRectF.united() PySide.QtCore.QRectF.operator|=()
- PySide.QtCore.QRectF.__ior__(r)¶
Parameters: r – PySide.QtCore.QRectF Return type: PySide.QtCore.QRectF Unites this rectangle with the given rectangle .
See also
PySide.QtCore.QRectF.united() PySide.QtCore.QRectF.operator|()
- PySide.QtCore.QRectF.right()¶
Return type: PySide.QtCore.qreal Returns the x-coordinate of the rectangle’s right edge.
- PySide.QtCore.QRectF.setBottom(pos)¶
Parameters: pos – PySide.QtCore.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.
- PySide.QtCore.QRectF.setBottomLeft(p)¶
Parameters: p – PySide.QtCore.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.
- PySide.QtCore.QRectF.setBottomRight(p)¶
Parameters: p – PySide.QtCore.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.
- PySide.QtCore.QRectF.setCoords(x1, y1, x2, y2)¶
Parameters: - x1 – PySide.QtCore.qreal
- y1 – PySide.QtCore.qreal
- x2 – PySide.QtCore.qreal
- y2 – PySide.QtCore.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 ).
- PySide.QtCore.QRectF.setHeight(h)¶
Parameters: h – PySide.QtCore.qreal Sets the height of the rectangle to the given height . The bottom edge is changed, but not the top one.
- PySide.QtCore.QRectF.setLeft(pos)¶
Parameters: pos – PySide.QtCore.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.
Equivalent to PySide.QtCore.QRectF.setX() .
- PySide.QtCore.QRectF.setRect(x, y, w, h)¶
Parameters: - x – PySide.QtCore.qreal
- y – PySide.QtCore.qreal
- w – PySide.QtCore.qreal
- h – PySide.QtCore.qreal
Sets the coordinates of the rectangle’s top-left corner to (x , y ), and its size to the given width and height .
- PySide.QtCore.QRectF.setRight(pos)¶
Parameters: pos – PySide.QtCore.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.
- PySide.QtCore.QRectF.setSize(s)¶
Parameters: s – PySide.QtCore.QSizeF Sets the size of the rectangle to the given size . The top-left corner is not moved.
- PySide.QtCore.QRectF.setTop(pos)¶
Parameters: pos – PySide.QtCore.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.
Equivalent to PySide.QtCore.QRectF.setY() .
- PySide.QtCore.QRectF.setTopLeft(p)¶
Parameters: p – PySide.QtCore.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.
- PySide.QtCore.QRectF.setTopRight(p)¶
Parameters: p – PySide.QtCore.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.
- PySide.QtCore.QRectF.setWidth(w)¶
Parameters: w – PySide.QtCore.qreal Sets the width of the rectangle to the given width . The right edge is changed, but not the left one.
- PySide.QtCore.QRectF.setX(pos)¶
Parameters: pos – PySide.QtCore.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.
Equivalent to PySide.QtCore.QRectF.setLeft() .
- PySide.QtCore.QRectF.setY(pos)¶
Parameters: pos – PySide.QtCore.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.
Equivalent to PySide.QtCore.QRectF.setTop() .
- PySide.QtCore.QRectF.size()¶
Return type: PySide.QtCore.QSizeF Returns the size of the rectangle.
- PySide.QtCore.QRectF.toAlignedRect()¶
Return type: PySide.QtCore.QRect Returns a PySide.QtCore.QRect based on the values of this rectangle that is the smallest possible integer rectangle that completely contains this rectangle.
See also
- PySide.QtCore.QRectF.toRect()¶
Return type: PySide.QtCore.QRect Returns a PySide.QtCore.QRect based on the values of this rectangle. Note that the coordinates in the returned rectangle are rounded to the nearest integer.
See also
PySide.QtCore.QRectF.QRectF() PySide.QtCore.QRectF.toAlignedRect()
- PySide.QtCore.QRectF.top()¶
Return type: PySide.QtCore.qreal Returns the y-coordinate of the rectangle’s top edge. Equivalent to PySide.QtCore.QRectF.y() .
- PySide.QtCore.QRectF.topLeft()¶
Return type: PySide.QtCore.QPointF Returns the position of the rectangle’s top-left corner.
- PySide.QtCore.QRectF.topRight()¶
Return type: PySide.QtCore.QPointF Returns the position of the rectangle’s top-right corner.
- PySide.QtCore.QRectF.translate(dx, dy)¶
Parameters: - dx – PySide.QtCore.qreal
- dy – PySide.QtCore.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.
- PySide.QtCore.QRectF.translate(p)
Parameters: p – PySide.QtCore.QPointF This is an overloaded function.
Moves the rectangle offset . PySide.QtCore.QPointF.x() along the x axis and offset . PySide.QtCore.QPointF.y() along the y axis, relative to the current position.
- PySide.QtCore.QRectF.translated(p)¶
Parameters: p – PySide.QtCore.QPointF Return type: PySide.QtCore.QRectF This is an overloaded function.
Returns a copy of the rectangle that is translated offset . PySide.QtCore.QPointF.x() along the x axis and offset . PySide.QtCore.QPointF.y() along the y axis, relative to the current position.
- PySide.QtCore.QRectF.translated(dx, dy)
Parameters: - dx – PySide.QtCore.qreal
- dy – PySide.QtCore.qreal
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
- PySide.QtCore.QRectF.unite(r)¶
Parameters: r – PySide.QtCore.QRectF Return type: PySide.QtCore.QRectF Use united(rectangle ) instead.
- PySide.QtCore.QRectF.united(other)¶
Parameters: other – PySide.QtCore.QRectF Return type: PySide.QtCore.QRectF Returns the bounding rectangle of this rectangle and the given rectangle .
See also
- PySide.QtCore.QRectF.width()¶
Return type: PySide.QtCore.qreal Returns the width of the rectangle.
- PySide.QtCore.QRectF.x()¶
Return type: PySide.QtCore.qreal Returns the x-coordinate of the rectangle’s left edge. Equivalent to PySide.QtCore.QRectF.left() .
- PySide.QtCore.QRectF.y()¶
Return type: PySide.QtCore.qreal Returns the y-coordinate of the rectangle’s top edge. Equivalent to PySide.QtCore.QRectF.top() .
