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# QRect Class Reference
[QtCore module]

The QRect class defines a rectangle in the plane using integer precision. More...

### Methods

- __init__ (self)
- __init__ (self, int aleft, int atop, int awidth, int aheight)
- __init__ (self, QPoint atopLeft, QPoint abottomRight)
- __init__ (self, QPoint atopLeft, QSize asize)
- __init__ (self, QRect other)
- adjust (self, int dx1, int dy1, int dx2, int dy2)
- QRect adjusted (self, int xp1, int yp1, int xp2, int yp2)
- int bottom (self)
- QPoint bottomLeft (self)
- QPoint bottomRight (self)
- QPoint center (self)
- bool contains (self, QPoint p, bool proper = False)
- bool contains (self, QRect r, bool proper = False)
- bool contains (self, int ax, int ay, bool aproper)
- bool contains (self, int ax, int ay)
- (int xp1, int yp1, int xp2, int yp2) getCoords (self)
- (int ax, int ay, int aw, int ah) getRect (self)
- int height (self)
- QRect intersect (self, QRect r)
- QRect intersected (self, QRect other)
- bool intersects (self, QRect r)
- bool isEmpty (self)
- bool isNull (self)
- bool isValid (self)
- int left (self)
- moveBottom (self, int pos)
- moveBottomLeft (self, QPoint p)
- moveBottomRight (self, QPoint p)
- moveCenter (self, QPoint p)
- moveLeft (self, int pos)
- moveRight (self, int pos)
- moveTo (self, int ax, int ay)
- moveTo (self, QPoint p)
- moveTop (self, int pos)
- moveTopLeft (self, QPoint p)
- moveTopRight (self, QPoint p)
- QRect normalized (self)
- int right (self)
- setBottom (self, int pos)
- setBottomLeft (self, QPoint p)
- setBottomRight (self, QPoint p)
- setCoords (self, int xp1, int yp1, int xp2, int yp2)
- setHeight (self, int h)
- setLeft (self, int pos)
- setRect (self, int ax, int ay, int aw, int ah)
- setRight (self, int pos)
- setSize (self, QSize s)
- setTop (self, int pos)
- setTopLeft (self, QPoint p)
- setTopRight (self, QPoint p)
- setWidth (self, int w)
- setX (self, int ax)
- setY (self, int ay)
- QSize size (self)
- int top (self)
- QPoint topLeft (self)
- QPoint topRight (self)
- translate (self, int dx, int dy)
- translate (self, QPoint p)
- QRect translated (self, int dx, int dy)
- QRect translated (self, QPoint p)
- QRect unite (self, QRect r)
- QRect united (self, QRect r)
- int width (self)
- int x (self)
- int y (self)

### Special Methods

- QRect __and__ (self, QRect r)
- int __contains__ (self, QPoint p)
- int __contains__ (self, QRect r)
- bool __eq__ (self, QRect r2)
- QRect __iand__ (self, QRect r)
- QRect __ior__ (self, QRect r)
- bool __ne__ (self, QRect r2)
- int __nonzero__ (self)
- QRect __or__ (self, QRect r)

## Detailed Description

The QRect class defines a rectangle in the plane using integer precision.

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

A QRect can be constructed with a set of left, top, width and height integers, or from a QPoint and a QSize. The following code creates two identical rectangles.

     QRect r1(100, 200, 11, 16);
     QRect r2(QPoint(100, 200), QSize(11, 16));

There is a third constructor that creates a QRect using the top-left and bottom-right coordinates, but we recommend that you avoid using it. The rationale is that for historical reasons the values returned by the bottom() and right() functions deviate from the true bottom-right corner of the rectangle.

The QRect class provides a collection of functions that return the various rectangle coordinates, and enable manipulation of these. QRect also provide 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 rectange's dimensions as a QSize. 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. The QRect 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()

The isEmpty() function returns true if left() > right() or top() > bottom(). Note that an empty rectangle is not valid: The isValid() function returns true if left() <= right() and top() <= bottom(). 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 QRect is defined in essentially the same way as QRectF.

Finally, QRect objects can be streamed as well as compared.

- Rendering
- Coordinates

### Rendering

When using an anti-aliased painter, the boundary line of a QRect 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 QRect'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 QRect class provides a collection of functions that return the various rectangle coordinates, and enable manipulation of these. QRect also provide functions to move the rectangle relative to the various coordinates.

For example the left(), setLeft() and moveLeft() functions as an example: left() returns the x-coordinate of the rectangle's left edge, setLeft() sets the left edge of the rectangle to the given x coordinate (it may change the width, but will never change the rectangle's right edge) and moveLeft() moves the entire rectangle horizontally, leaving the rectangle's left edge at the given x coordinate and its size unchanged.

Note that for historical reasons the values returned by the bottom() and right() functions deviate from the true bottom-right corner of the rectangle: The right() function returns left() + width() - 1 and the bottom() function returns top() + height() - 1. The same is the case for the point returned by the bottomRight() convenience function. In addition, the x and y coordinate of the topRight() and bottomLeft() functions, respectively, contain the same deviation from the true right and bottom edges.

We recommend that you use x() + width() and y() + height() to find the true bottom-right corner, and avoid right() and bottom(). Another solution is to use QRectF: The QRectF class defines a rectangle in the plane using floating point accuracy for coordinates, and the QRectF.right() and QRectF.bottom() functions do return the right and bottom coordinates.

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, QRect 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.

See also QRectF and QRegion.

## Method Documentation

### QRect.__init__ (self)

Constructs a null rectangle.

See also isNull().

### QRect.__init__ (self, int aleft, int atop, int awidth, int aheight)

Constructs a rectangle with the given topLeft and bottomRight corners.

See also setTopLeft() and setBottomRight().

### QRect.__init__ (self, QPoint atopLeft, QPoint abottomRight)

Constructs a rectangle with the given topLeft corner and the given size.

See also setTopLeft() and setSize().

### QRect.__init__ (self, QPoint atopLeft, QSize asize)

Constructs a rectangle with (x, y) as its top-left corner and the given width and height.

See also setRect().

### QRect.__init__ (self, QRect other)

### QRect.adjust (self, int dx1, int dy1, int dx2, int dy2)

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

See also adjusted() and setRect().

### QRect QRect.adjusted (self, int xp1, int yp1, int xp2, int yp2)

Returns a new rectangle with dx1, dy1, dx2 and dy2 added respectively to the existing coordinates of this rectangle.

See also adjust().

### int QRect.bottom (self)

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

Note that for historical reasons this function returns top() + height() - 1; use y() + height() to retrieve the true y-coordinate.

See also setBottom(), bottomLeft(), and bottomRight().

### QPoint QRect.bottomLeft (self)

Returns the position of the rectangle's bottom-left corner. Note that for historical reasons this function returns QPoint(left(), top() + height() - 1).

See also setBottomLeft(), bottom(), and left().

### QPoint QRect.bottomRight (self)

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

Note that for historical reasons this function returns QPoint(left() + width() -1, top() + height() - 1).

See also setBottomRight(), bottom(), and right().

### QPoint QRect.center (self)

Returns the center point of the rectangle.

See also moveCenter().

### bool QRect.contains (self, QPoint p, bool proper = False)

Returns true if the the given point is inside or on the edge of the rectangle, otherwise returns false. If proper is true, this function only returns true if the given point is inside the rectangle (i.e., not on the edge).

See also intersects().

### bool QRect.contains (self, QRect r, bool proper = False)

This is an overloaded member function, provided for convenience.

Returns true if the point (x, y) is inside or on the edge of the rectangle, otherwise returns false. If proper is true, this function only returns true if the point is entirely inside the rectangle(not on the edge).

### bool QRect.contains (self, int ax, int ay, bool aproper)

This is an overloaded member function, provided for convenience.

Returns true if the point (x, y) is inside this rectangle, otherwise returns false.

### bool QRect.contains (self, int ax, int ay)

This is an overloaded member function, provided for convenience.

Returns true if the given rectangle is inside this rectangle. otherwise returns false. If proper is true, this function only returns true if the rectangle is entirely inside this rectangle (not on the edge).

### (int xp1, int yp1, int xp2, int yp2) QRect.getCoords (self)

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.

See also setCoords() and getRect().

### (int ax, int ay, int aw, int ah) QRect.getRect (self)

Extracts the position of the rectangle's top-left corner to *x and *y, and its dimensions to *width and *height.

See also setRect() and getCoords().

### int QRect.height (self)

Returns the height of the rectangle.

See also setHeight(), width(), and size().

### QRect QRect.intersect (self, QRect r)

### QRect QRect.intersected (self, QRect other)

Returns the intersection of this rectangle and the given rectangle. Note that `r.intersected(s)` is equivalent to `r & s`.

This function was introduced in Qt 4.2.

See also intersects(), united(), and operator&=().

### bool QRect.intersects (self, QRect r)

Returns true if this rectangle intersects with the given rectangle (i.e., there is at least one pixel that is within both rectangles), otherwise returns false.

The intersection rectangle can be retrieved using the intersected() function.

See also contains().

### bool QRect.isEmpty (self)

Returns true if the rectangle is empty, otherwise returns false.

An empty rectangle has a left() > right() or top() > bottom(). An empty rectangle is not valid (i.e., isEmpty() == !isValid()).

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

See also isNull(), isValid(), and normalized().

### bool QRect.isNull (self)

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 (i.e., right() == left() - 1 and bottom() == top() - 1). A null rectangle is also empty, and hence is not valid.

See also isEmpty() and isValid().

### bool QRect.isValid (self)

Returns true if the rectangle is valid, otherwise returns false.

A valid rectangle has a left() < right() and top() < bottom(). Note that non-trivial operations like intersections are not defined for invalid rectangles. A valid rectangle is not empty (i.e., isValid() == !isEmpty()).

See also isNull(), isEmpty(), and normalized().

### int QRect.left (self)

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

See also setLeft(), topLeft(), and bottomLeft().

### QRect.moveBottom (self, int pos)

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

See also bottom(), setBottom(), and moveTop().

### QRect.moveBottomLeft (self, QPoint p)

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

See also setBottomLeft(), moveBottom(), and moveLeft().

### QRect.moveBottomRight (self, QPoint p)

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

See also setBottomRight(), moveRight(), and moveBottom().

### QRect.moveCenter (self, QPoint p)

Moves the rectangle, leaving the center point at the given position. The rectangle's size is unchanged.

See also center().

### QRect.moveLeft (self, int pos)

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

See also left(), setLeft(), and moveRight().

### QRect.moveRight (self, int pos)

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

See also right(), setRight(), and moveLeft().

### QRect.moveTo (self, int ax, int ay)

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

See also translate() and moveTopLeft().

### QRect.moveTo (self, QPoint p)

This is an overloaded member function, provided for convenience.

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

### QRect.moveTop (self, int pos)

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

See also top(), setTop(), and moveBottom().

### QRect.moveTopLeft (self, QPoint p)

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

See also setTopLeft(), moveTop(), and moveLeft().

### QRect.moveTopRight (self, QPoint p)

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

See also setTopRight(), moveTop(), and moveRight().

### QRect QRect.normalized (self)

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

See also isValid() and isEmpty().

### int QRect.right (self)

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

Note that for historical reasons this function returns left() + width() - 1; use x() + width() to retrieve the true x-coordinate.

See also setRight(), topRight(), and bottomRight().

### QRect.setBottom (self, int pos)

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 bottom() and moveBottom().

### QRect.setBottomLeft (self, QPoint p)

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

See also bottomLeft() and moveBottomLeft().

### QRect.setBottomRight (self, QPoint p)

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

See also bottomRight() and moveBottomRight().

### QRect.setCoords (self, int xp1, int yp1, int xp2, int yp2)

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

See also coords(), getCoords(), and setRect().

### QRect.setHeight (self, int h)

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

See also height() and setSize().

### QRect.setLeft (self, int pos)

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 left() and moveLeft().

### QRect.setRect (self, int ax, int ay, int aw, int ah)

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

See also rect(), getRect(), and setCoords().

### QRect.setRight (self, int pos)

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 right() and moveRight().

### QRect.setSize (self, QSize s)

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

See also size(), setWidth(), and setHeight().

### QRect.setTop (self, int pos)

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().

See also top() and moveTop().

### QRect.setTopLeft (self, QPoint p)

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

See also topLeft() and moveTopLeft().

### QRect.setTopRight (self, QPoint p)

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

See also topRight() and moveTopRight().

### QRect.setWidth (self, int w)

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

See also width() and setSize().

### QRect.setX (self, int ax)

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 x(), setY(), and setTopLeft().

### QRect.setY (self, int ay)

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 y(), setX(), and setTopLeft().

### QSize QRect.size (self)

Returns the size of the rectangle.

See also setSize(), width(), and height().

### int QRect.top (self)

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

See also setTop(), topLeft(), and topRight().

### QPoint QRect.topLeft (self)

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

See also setTopLeft(), top(), and left().

### QPoint QRect.topRight (self)

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

Note that for historical reasons this function returns QPoint(left() + width() -1, top()).

See also setTopRight(), top(), and right().

### QRect.translate (self, int dx, int dy)

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 down.

See also moveTopLeft(), moveTo(), and translated().

### QRect.translate (self, QPoint p)

This is an overloaded member function, provided for convenience.

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

### QRect QRect.translated (self, int dx, int dy)

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 translate().

### QRect QRect.translated (self, QPoint p)

This is an overloaded member function, provided for convenience.

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.

### QRect QRect.unite (self, QRect r)

### QRect QRect.united (self, QRect r)

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

This function was introduced in Qt 4.2.

See also intersected().

### int QRect.width (self)

Returns the width of the rectangle.

See also setWidth(), height(), and size().

### int QRect.x (self)

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

See also setX(), y(), and topLeft().

### int QRect.y (self)

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

See also setY(), x(), and topLeft().

### QRect QRect.__and__ (self, QRect r)

### int QRect.__contains__ (self, QPoint p)

### int QRect.__contains__ (self, QRect r)

### bool QRect.__eq__ (self, QRect r2)

### QRect QRect.__iand__ (self, QRect r)

### QRect QRect.__ior__ (self, QRect r)

### bool QRect.__ne__ (self, QRect r2)

### int QRect.__nonzero__ (self)

### QRect QRect.__or__ (self, QRect r)