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java.lang.Objectcom.trolltech.qt.internal.QSignalEmitterInternal
com.trolltech.qt.QSignalEmitter
com.trolltech.qt.QtJambiObject
com.trolltech.qt.gui.QLine
public class QLine
The QLine class provides a two-dimensional vector using integer precision. A QLine describes a finite length line (or a line segment) on a two-dimensional surface. The start and end points of the line are specified using integer point accuracy for coordinates. Use the QLineF
constructor to retrieve a floating point copy.
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p1()
, x1()
, y1()
, p2()
, x2()
, and y2()
functions. The dx()
and dy()
functions return the horizontal and vertical components of the line. Use isNull()
to determine whether the QLine represents a valid line or a null line. Finally, the line can be translated a given offset using the translate()
function.
QLineF
, QPolygon
, and QRect
.
Nested Class Summary |
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Nested classes/interfaces inherited from class com.trolltech.qt.internal.QSignalEmitterInternal |
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com.trolltech.qt.internal.QSignalEmitterInternal.AbstractSignalInternal |
Field Summary |
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Fields inherited from class com.trolltech.qt.internal.QSignalEmitterInternal |
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currentSender |
Constructor Summary | |
---|---|
QLine()
Constructs a null line. |
|
QLine(int x1,
int y1,
int x2,
int y2)
Constructs a line object that represents the line between (x1, y1) and (x2, y2). |
|
QLine(QPoint pt1,
QPoint pt2)
Constructs a line object that represents the line between p1 and p2. |
Method Summary | |
---|---|
QLine |
clone()
This method is reimplemented for internal reasons |
int |
dx()
Returns the horizontal component of the line's vector. |
int |
dy()
Returns the vertical component of the line's vector. |
boolean |
isNull()
Returns true if the line is not set up with valid start and end point; otherwise returns false. |
QPoint |
p1()
Returns the line's start point. |
QPoint |
p2()
Returns the line's end point. |
void |
readFrom(QDataStream arg__1)
|
void |
setLine(int x1,
int y1,
int x2,
int y2)
Sets this line to the start in x1, y1 and end in x2, y2. |
void |
setP1(QPoint p1)
Sets the starting point of this line to p1. |
void |
setP2(QPoint p2)
Sets the end point of this line to p2. |
void |
setPoints(QPoint p1,
QPoint p2)
Sets the start point of this line to p1 and the end point of this line to p2. |
java.lang.String |
toString()
|
void |
translate(int dx,
int dy)
This is an overloaded member function, provided for convenience. |
void |
translate(QPoint p)
Translates this line by the given offset. |
QLine |
translated(int dx,
int dy)
This is an overloaded member function, provided for convenience. |
QLine |
translated(QPoint p)
Returns this line translated by the given offset. |
void |
writeTo(QDataStream arg__1)
|
int |
x1()
Returns the x-coordinate of the line's start point. |
int |
x2()
Returns the x-coordinate of the line's end point. |
int |
y1()
Returns the y-coordinate of the line's start point. |
int |
y2()
Returns the y-coordinate of the line's end point. |
Methods inherited from class com.trolltech.qt.QtJambiObject |
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dispose, disposed, equals, finalize, reassignNativeResources, tr, tr, tr |
Methods inherited from class com.trolltech.qt.QSignalEmitter |
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blockSignals, disconnect, disconnect, signalsBlocked, signalSender, thread |
Methods inherited from class com.trolltech.qt.internal.QSignalEmitterInternal |
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__qt_signalInitialization |
Methods inherited from class java.lang.Object |
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getClass, hashCode, notify, notifyAll, wait, wait, wait |
Methods inherited from interface com.trolltech.qt.QtJambiInterface |
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disableGarbageCollection, nativeId, nativePointer, reenableGarbageCollection, setJavaOwnership |
Constructor Detail |
---|
public QLine()
public QLine(QPoint pt1, QPoint pt2)
public QLine(int x1, int y1, int x2, int y2)
Method Detail |
---|
public final int dx()
dy()
.
public final int dy()
dx()
.
public final boolean isNull()
public final void writeTo(QDataStream arg__1)
public final void readFrom(QDataStream arg__1)
public final QPoint p1()
setP1()
, x1()
, y1()
, and p2()
.
public final QPoint p2()
setP2()
, x2()
, y2()
, and p1()
.
public final void setLine(int x1, int y1, int x2, int y2)
setP1()
, setP2()
, p1()
, and p2()
.
public final void setP1(QPoint p1)
setP2()
, and p1()
.
public final void setP2(QPoint p2)
setP1()
, and p2()
.
public final void setPoints(QPoint p1, QPoint p2)
setP1()
, setP2()
, p1()
, and p2()
.
public final void translate(QPoint p)
public final void translate(int dx, int dy)
Translates this line the distance specified by dx and dy.
public final QLine translated(QPoint p)
public final QLine translated(int dx, int dy)
Returns this line translated the distance specified by dx and dy.
public final int x1()
p1()
.
public final int x2()
p2()
.
public final int y1()
p1()
.
public final int y2()
p2()
.
public java.lang.String toString()
toString
in class java.lang.Object
public QLine clone()
clone
in class java.lang.Object
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