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java.lang.Objectcom.trolltech.qt.internal.QSignalEmitterInternal
com.trolltech.qt.QSignalEmitter
com.trolltech.qt.QtJambiObject
com.trolltech.qt.core.QPointF
public class QPointF
The QPointF
class defines a point in the plane using floating point precision. A point is specified by a x coordinate and an y coordinate which can be accessed using the x()
and y()
functions. The coordinates of the point are specified using floating point numbers for accuracy. The isNull()
function returns true if both x and y are set to 0.0. The coordinates can be set (or altered) using the setX()
and setY()
functions, or alternatively the rx() and ry() functions which return references to the coordinates (allowing direct manipulation).
Given a point p, the following statements are all equivalent:
QPointF p = new QPointF(); p.setX(p.x() + 1.0); p.add(new QPointF(1.0, 0.0));A
QPointF
object can also be used as a vector: Addition and subtraction are defined as for vectors (each component is added separately). A QPointF
object can also be divided or multiplied by an int or a qreal. In addition, the QPointF
class provides a constructor converting a QPoint
object into a QPointF
object, and a corresponding toPoint()
function which returns a QPoint
copy of this point. Finally, QPointF
objects can be streamed as well as compared.
QPoint
, and QPolygonF
.
Nested Class Summary |
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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 |
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currentSender |
Constructor Summary | |
---|---|
QPointF()
Constructs a null point, i. |
|
QPointF(double xpos,
double ypos)
Constructs a point with the given coordinates (x, y). |
|
QPointF(QPoint p)
Constructs a copy of the given point. |
Method Summary | |
---|---|
QPointF |
add(QPointF p)
Adds p to this QPointF and returns the result. |
QPointF |
clone()
This method is reimplemented for internal reasons |
QPointF |
divide(double d)
Divides this QPointF by deviser s and returns the result. |
boolean |
isNull()
Returns true if both the x and y coordinates are set to 0.0, otherwise returns false. |
QPointF |
multiply(double d)
Multiplies this QPointF by factor d and returns the result. |
void |
readFrom(QDataStream arg__1)
|
void |
setX(double x)
Sets the x coordinate of this point to the given x coordinate. |
void |
setY(double y)
Sets the y coordinate of this point to the given y coordinate. |
QPointF |
subtract(QPointF p)
Subtracts p from this QPointF and returns the result. |
QPoint |
toPoint()
Rounds the coordinates of this point to the nearest integer, and returns a QPoint object with the rounded coordinates. |
java.lang.String |
toString()
|
void |
writeTo(QDataStream arg__1)
|
double |
x()
Returns the x-coordinate of this point. |
double |
y()
Returns the y-coordinate of this point. |
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 QPointF()
isNull()
.
public QPointF(QPoint p)
toPoint()
.
public QPointF(double xpos, double ypos)
setX()
, and setY()
.
Method Detail |
---|
public final boolean isNull()
public final void writeTo(QDataStream arg__1)
public final void readFrom(QDataStream arg__1)
public final void setX(double x)
x()
, and setY()
.
public final void setY(double y)
y()
, and setX()
.
public final QPoint toPoint()
QPoint
object with the rounded coordinates.
public final double x()
setX()
, and rx().
public final double y()
setY()
, and ry().
public final QPointF multiply(double d)
public final QPointF divide(double d)
public final QPointF add(QPointF p)
public final QPointF subtract(QPointF p)
public java.lang.String toString()
toString
in class java.lang.Object
public QPointF clone()
clone
in class java.lang.Object
|
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