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java.lang.Objectcom.trolltech.qt.internal.QSignalEmitterInternal
com.trolltech.qt.QSignalEmitter
com.trolltech.qt.QtJambiObject
com.trolltech.qt.core.QRectF
public class QRectF
The 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 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 integers, or from a QPoint
and a QSize
. The following code creates two identical rectangles.
QRectF r1 = new QRectF(100, 200, 11, 16); QRectF r2 = new QRectF(new QPointF(100, 200), new QSizeF(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 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 (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
.
Finally, QRectF
objects can be streamed as well as compared.
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 |
QRectF
class provides a collection of functions that return the various rectangle coordinates, and enable manipulation of these. QRectF
also provide 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.
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 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.
QRect
, and QRegion
.
Nested Class Summary |
---|
Nested classes/interfaces inherited from class com.trolltech.qt.QSignalEmitter |
---|
QSignalEmitter.AbstractSignal, QSignalEmitter.Signal0, QSignalEmitter.Signal1, QSignalEmitter.Signal2, QSignalEmitter.Signal3, QSignalEmitter.Signal4, QSignalEmitter.Signal5, QSignalEmitter.Signal6, QSignalEmitter.Signal7, QSignalEmitter.Signal8, QSignalEmitter.Signal9 |
Nested classes/interfaces inherited from class com.trolltech.qt.internal.QSignalEmitterInternal |
---|
com.trolltech.qt.internal.QSignalEmitterInternal.AbstractSignalInternal |
Field Summary |
---|
Fields inherited from class com.trolltech.qt.internal.QSignalEmitterInternal |
---|
currentSender |
Constructor Summary | |
---|---|
QRectF()
Constructs a null rectangle. |
|
QRectF(double left,
double top,
double width,
double height)
Constructs a rectangle with (x, y) as its top-left corner and the given width and height. |
|
QRectF(QPointF topleft,
QPointF bottomRight)
Constructs a rectangle with the given topLeft and bottomRight corners. |
|
QRectF(QPointF topleft,
QSizeF size)
Constructs a rectangle with the given topLeft corner and the given size. |
|
QRectF(QRect rect)
Constructs a QRectF rectangle from the given QRect rectangle. |
Method Summary | |
---|---|
void |
adjust(double x1,
double y1,
double x2,
double y2)
Adds dx1, dy1, dx2 and dy2 respectively to the existing coordinates of the rectangle. |
QRectF |
adjusted(double x1,
double y1,
double x2,
double y2)
Returns a new rectangle with dx1, dy1, dx2 and dy2 added respectively to the existing coordinates of this rectangle. |
double |
bottom()
Returns the y-coordinate of the rectangle's bottom edge. |
QPointF |
bottomLeft()
Returns the position of the rectangle's bottom-left corner. |
QPointF |
bottomRight()
Returns the position of the rectangle's bottom-right corner. |
QPointF |
center()
Returns the center point of the rectangle. |
QRectF |
clone()
This method is reimplemented for internal reasons |
boolean |
contains(double x,
double y)
Returns true if the point (x, y) is inside or on the edge of the rectangle; otherwise returns false. |
boolean |
contains(QPointF p)
Returns true if the given point is inside or on the edge of the rectangle; otherwise returns false. |
boolean |
contains(QRectF r)
Returns true if the given rectangle is inside this rectangle; otherwise returns false. |
double |
height()
Returns the height of the rectangle. |
QRectF |
intersected(QRectF other)
Returns the intersection of this rectangle and the given rectangle. |
boolean |
intersects(QRectF r)
Returns true if this rectangle intersects with the given rectangle (i. |
boolean |
isEmpty()
Returns true if the rectangle is empty, otherwise returns false. |
boolean |
isNull()
Returns true if the rectangle is a null rectangle, otherwise returns false. |
boolean |
isValid()
Returns true if the rectangle is valid, otherwise returns false. |
double |
left()
Returns the x-coordinate of the rectangle's left edge. |
void |
moveBottom(double pos)
Moves the rectangle vertically, leaving the rectangle's bottom edge at the given y coordinate. |
void |
moveBottomLeft(QPointF p)
Moves the rectangle, leaving the bottom-left corner at the given position. |
void |
moveBottomRight(QPointF p)
Moves the rectangle, leaving the bottom-right corner at the given position. |
void |
moveCenter(QPointF p)
Moves the rectangle, leaving the center point at the given position. |
void |
moveLeft(double pos)
Moves the rectangle horizontally, leaving the rectangle's left edge at the given x coordinate. |
void |
moveRight(double pos)
Moves the rectangle horizontally, leaving the rectangle's right edge at the given x coordinate. |
void |
moveTo(double x,
double t)
Moves the rectangle, leaving the top-left corner at the given position (x, y). |
void |
moveTo(QPointF p)
Moves the rectangle, leaving the top-left corner at the given position. |
void |
moveTop(double pos)
Moves the rectangle vertically, leaving the rectangle's top line at the given y coordinate. |
void |
moveTopLeft(QPointF p)
Moves the rectangle, leaving the top-left corner at the given position. |
void |
moveTopRight(QPointF p)
Moves the rectangle, leaving the top-right corner at the given position. |
QRectF |
normalized()
Returns a normalized rectangle; i. |
void |
readFrom(QDataStream arg__1)
|
double |
right()
Returns the x-coordinate of the rectangle's right edge. |
void |
setBottom(double pos)
Sets the bottom edge of the rectangle to the given y coordinate. |
void |
setBottomLeft(QPointF p)
Set the bottom-left corner of the rectangle to the given position. |
void |
setBottomRight(QPointF p)
Set the bottom-right corner of the rectangle to the given position. |
void |
setCoords(double x1,
double y1,
double x2,
double y2)
Sets the coordinates of the rectangle's top-left corner to (x1, y1), and the coordinates of its bottom-right corner to (x2, y2). |
void |
setHeight(double h)
Sets the height of the rectangle to the given height. |
void |
setLeft(double pos)
Sets the left edge of the rectangle to the given x coordinate. |
void |
setRect(double x,
double y,
double w,
double h)
Sets the coordinates of the rectangle's top-left corner to (x, y), and its size to the given width and height. |
void |
setRight(double pos)
Sets the right edge of the rectangle to the given x coordinate. |
void |
setSize(QSizeF s)
Sets the size of the rectangle to the given size. |
void |
setTop(double pos)
Sets the top edge of the rectangle to the given y coordinate. |
void |
setTopLeft(QPointF p)
Set the top-left corner of the rectangle to the given position. |
void |
setTopRight(QPointF p)
Set the top-right corner of the rectangle to the given position. |
void |
setWidth(double w)
Sets the width of the rectangle to the given width. |
void |
setX(double pos)
Sets the left edge of the rectangle to the given x coordinate. |
void |
setY(double pos)
Sets the top edge of the rectangle to the given y coordinate. |
QSizeF |
size()
Returns the size of the rectangle. |
QRect |
toAlignedRect()
Returns a QRect based on the values of this rectangle that is the smallest possible integer rectangle that completely contains this rectangle. |
double |
top()
Returns the y-coordinate of the rectangle's top edge. |
QPointF |
topLeft()
Returns the position of the rectangle's top-left corner. |
QPointF |
topRight()
Returns the position of the rectangle's top-right corner. |
QRect |
toRect()
Returns a QRect based on the values of this rectangle. |
java.lang.String |
toString()
|
void |
translate(double dx,
double dy)
Moves the rectangle dx along the x-axis and dy along the y-axis, relative to the current position. |
void |
translate(QPointF p)
Moves the rectangle offset. |
QRectF |
translated(double dx,
double 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. |
QRectF |
translated(QPointF p)
Returns a copy of the rectangle that is translated offset. |
QRectF |
united(QRectF other)
Returns the bounding rectangle of this rectangle and the given rectangle. |
double |
width()
Returns the width of the rectangle. |
void |
writeTo(QDataStream arg__1)
|
double |
x()
Returns the x-coordinate of the rectangle's left edge. |
double |
y()
Returns the y-coordinate of the rectangle's top edge. |
Methods inherited from class com.trolltech.qt.QtJambiObject |
---|
dispose, disposed, equals, finalize, reassignNativeResources, tr, tr, tr |
Methods inherited from class com.trolltech.qt.QSignalEmitter |
---|
blockSignals, disconnect, disconnect, signalsBlocked, signalSender, thread |
Methods inherited from class com.trolltech.qt.internal.QSignalEmitterInternal |
---|
__qt_signalInitialization |
Methods inherited from class java.lang.Object |
---|
getClass, hashCode, notify, notifyAll, wait, wait, wait |
Methods inherited from interface com.trolltech.qt.QtJambiInterface |
---|
disableGarbageCollection, nativeId, nativePointer, reenableGarbageCollection, setJavaOwnership |
Constructor Detail |
---|
public QRectF()
isNull()
.
public QRectF(QPointF topleft, QPointF bottomRight)
setTopLeft()
, and setBottomRight()
.
public QRectF(QPointF topleft, QSizeF size)
setTopLeft()
, and setSize()
.
public QRectF(QRect rect)
QRectF
rectangle from the given QRect
rectangle. toRect()
.
public QRectF(double left, double top, double width, double height)
setRect()
.
Method Detail |
---|
public final void adjust(double x1, double y1, double x2, double y2)
adjusted()
, and setRect()
.
public final QRectF adjusted(double x1, double y1, double x2, double y2)
adjust()
.
public final double bottom()
setBottom()
, bottomLeft()
, and bottomRight()
.
public final QPointF bottomLeft()
setBottomLeft()
, bottom()
, and left()
.
public final QPointF bottomRight()
setBottomRight()
, bottom()
, and right()
.
public final QPointF center()
moveCenter()
.
public final boolean contains(QPointF p)
intersects()
.
public final boolean contains(QRectF r)
public final boolean contains(double x, double y)
public final double height()
setHeight()
, width()
, and size()
.
public final QRectF intersected(QRectF other)
intersects()
, united()
, and operator&=().
public final boolean intersects(QRectF r)
The intersection rectangle can be retrieved using the intersected()
function.
contains()
.
public final boolean isEmpty()
An empty rectangle has width()
<= 0 or height()
<= 0. An empty rectangle is not valid (i.e., isEmpty()
== !isValid()
).
Use the normalized()
function to retrieve a rectangle where the corners are swapped.
isNull()
, isValid()
, and normalized()
.
public final boolean isNull()
A null rectangle has both the width and the height set to 0. A null rectangle is also empty, and hence not valid.
isEmpty()
, and isValid()
.
public final boolean isValid()
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., isValid()
== !isEmpty()
).
isNull()
, isEmpty()
, and normalized()
.
public final double left()
x()
. setLeft()
, topLeft()
, and bottomLeft()
.
public final void moveBottom(double pos)
bottom()
, setBottom()
, and moveTop()
.
public final void moveBottomLeft(QPointF p)
setBottomLeft()
, moveBottom()
, and moveLeft()
.
public final void moveBottomRight(QPointF p)
setBottomRight()
, moveBottom()
, and moveRight()
.
public final void moveCenter(QPointF p)
center()
.
public final void moveLeft(double pos)
left()
, setLeft()
, and moveRight()
.
public final void moveRight(double pos)
right()
, setRight()
, and moveLeft()
.
public final void moveTo(QPointF p)
public final void moveTo(double x, double t)
translate()
, and moveTopLeft()
.
public final void moveTop(double pos)
top()
, setTop()
, and moveBottom()
.
public final void moveTopLeft(QPointF p)
setTopLeft()
, moveTop()
, and moveLeft()
.
public final void moveTopRight(QPointF p)
setTopRight()
, moveTop()
, and moveRight()
.
public final QRectF normalized()
If width()
< 0 the function swaps the left and right corners, and it swaps the top and bottom corners if height()
< 0.
isValid()
, and isEmpty()
.
public final void writeTo(QDataStream arg__1)
public final void readFrom(QDataStream arg__1)
public final double right()
setRight()
, topRight()
, and bottomRight()
.
public final void setBottom(double pos)
bottom()
, and moveBottom()
.
public final void setBottomLeft(QPointF p)
bottomLeft()
, and moveBottomLeft()
.
public final void setBottomRight(QPointF p)
bottomRight()
, and moveBottomRight()
.
public final void setCoords(double x1, double y1, double x2, double y2)
setRect()
.
public final void setHeight(double h)
height()
, and setSize()
.
public final void setLeft(double pos)
Equivalent to setX()
.
left()
, and moveLeft()
.
public final void setRect(double x, double y, double w, double h)
setCoords()
.
public final void setRight(double pos)
right()
, and moveRight()
.
public final void setSize(QSizeF s)
size()
, setWidth()
, and setHeight()
.
public final void setTop(double pos)
Equivalent to setY()
.
top()
, and moveTop()
.
public final void setTopLeft(QPointF p)
topLeft()
, and moveTopLeft()
.
public final void setTopRight(QPointF p)
topRight()
, and moveTopRight()
.
public final void setWidth(double w)
width()
, and setSize()
.
public final void setX(double pos)
Equivalent to setLeft()
.
x()
, setY()
, and setTopLeft()
.
public final void setY(double pos)
Equivalent to setTop()
.
y()
, setX()
, and setTopLeft()
.
public final QSizeF size()
setSize()
, width()
, and height()
.
public final QRect toAlignedRect()
QRect
based on the values of this rectangle that is the smallest possible integer rectangle that completely contains this rectangle. toRect()
.
public final QRect toRect()
QRect
based on the values of this rectangle. Note that the coordinates in the returned rectangle are rounded to the nearest integer. toAlignedRect()
.
public final double top()
y()
. setTop()
, topLeft()
, and topRight()
.
public final QPointF topLeft()
setTopLeft()
, top()
, and left()
.
public final QPointF topRight()
setTopRight()
, top()
, and right()
.
public final void translate(QPointF p)
y()
along the y axis, relative to the current position.
public final void translate(double dx, double dy)
moveTopLeft()
, moveTo()
, and translated()
.
public final QRectF translated(QPointF p)
y()
along the y axis, relative to the current position.
public final QRectF translated(double dx, double dy)
translate()
.
public final QRectF united(QRectF other)
intersected()
.
public final double width()
setWidth()
, height()
, and size()
.
public final double x()
left()
. setX()
, y()
, and topLeft()
.
public final double y()
top()
. setY()
, x()
, and topLeft()
.
public java.lang.String toString()
toString
in class java.lang.Object
public QRectF clone()
clone
in class java.lang.Object
|
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