The QGraphicsScale class provides a scale transformation. More...

#include <qgraphicstransform.h>

Inheritance diagram for QGraphicsScale:

Signals
void	originChanged ()
	QGraphicsScale emits this signal when its origin changes. More...

void	scaleChanged ()
	This signal is emitted whenever the xScale, yScale, or zScale of the object changes. More...

void	xScaleChanged ()
	This signal is emitted whenever the xScale property changes. More...

void	yScaleChanged ()
	This signal is emitted whenever the yScale property changes. More...

void	zScaleChanged ()
	This signal is emitted whenever the zScale property changes. More...

Signals inherited from QObject
void	destroyed (QObject *=0)
	This signal is emitted immediately before the object obj is destroyed, and can not be blocked. More...

Public Functions
void	applyTo (QMatrix4x4 *matrix) const
	Reimplemented Function More...

QVector3D	origin () const

	QGraphicsScale (QObject *parent=0)
	Constructs an empty QGraphicsScale object with the given parent. More...

void	setOrigin (const QVector3D &point)

void	setXScale (qreal)

void	setYScale (qreal)

void	setZScale (qreal)

qreal	xScale () const

qreal	yScale () const

qreal	zScale () const

	~QGraphicsScale ()
	Destroys the graphics scale. More...

Public Functions inherited from QGraphicsTransform
	QGraphicsTransform (QObject *parent=0)
	Constructs a new QGraphicsTransform with the given parent. More...

	~QGraphicsTransform ()
	Destroys the graphics transform. More...

Public Functions inherited from QObject
bool	blockSignals (bool b)
	If block is true, signals emitted by this object are blocked (i.e., emitting a signal will not invoke anything connected to it). More...

const QObjectList &	children () const
	Returns a list of child objects. More...

bool	connect (const QObject sender, const char signal, const char *member, Qt::ConnectionType type=Qt::AutoConnection) const

bool	disconnect (const char signal=0, const QObject receiver=0, const char *member=0)

bool	disconnect (const QObject receiver, const char member=0)

void	dumpObjectInfo ()
	Dumps information about signal connections, etc. More...

void	dumpObjectTree ()
	Dumps a tree of children to the debug output. More...

QList< QByteArray >	dynamicPropertyNames () const
	Returns the names of all properties that were dynamically added to the object using setProperty(). More...

virtual bool	event (QEvent *)
	This virtual function receives events to an object and should return true if the event e was recognized and processed. More...

virtual bool	eventFilter (QObject , QEvent )
	Filters events if this object has been installed as an event filter for the watched object. More...

template<typename T >
T	findChild (const QString &aName=QString()) const
	Returns the child of this object that can be cast into type T and that is called name, or 0 if there is no such object. More...

template<typename T >
QList< T >	findChildren (const QString &aName=QString()) const
	Returns all children of this object with the given name that can be cast to type T, or an empty list if there are no such objects. More...

template<typename T >
QList< T >	findChildren (const QRegExp &re) const

bool	inherits (const char *classname) const
	Returns true if this object is an instance of a class that inherits className or a QObject subclass that inherits className; otherwise returns false. More...

void	installEventFilter (QObject *)
	Installs an event filter filterObj on this object. More...

bool	isWidgetType () const
	Returns true if the object is a widget; otherwise returns false. More...

void	killTimer (int id)
	Kills the timer with timer identifier, id. More...

virtual const QMetaObject *	metaObject () const
	Returns a pointer to the meta-object of this object. More...

void	moveToThread (QThread *thread)
	Changes the thread affinity for this object and its children. More...

QString	objectName () const

QObject *	parent () const
	Returns a pointer to the parent object. More...

QVariant	property (const char *name) const
	Returns the value of the object's name property. More...

Q_INVOKABLE	QObject (QObject *parent=0)
	Constructs an object with parent object parent. More...

void	removeEventFilter (QObject *)
	Removes an event filter object obj from this object. More...

void	setObjectName (const QString &name)

void	setParent (QObject *)
	Makes the object a child of parent. More...

bool	setProperty (const char *name, const QVariant &value)
	Sets the value of the object's name property to value. More...

void	setUserData (uint id, QObjectUserData *data)

bool	signalsBlocked () const
	Returns true if signals are blocked; otherwise returns false. More...

int	startTimer (int interval)
	Starts a timer and returns a timer identifier, or returns zero if it could not start a timer. More...

QThread *	thread () const
	Returns the thread in which the object lives. More...

QObjectUserData *	userData (uint id) const

virtual	~QObject ()
	Destroys the object, deleting all its child objects. More...

Properties
QVector3D	origin
	the origin of the scale in 3D space. More...

qreal	xScale
	the horizontal scale factor. More...

qreal	yScale
	the vertical scale factor. More...

qreal	zScale
	the depth scale factor. More...

Additional Inherited Members
Public Slots inherited from QObject
void	deleteLater ()
	Schedules this object for deletion. More...

Static Public Functions inherited from QObject
static bool	connect (const QObject sender, const char signal, const QObject receiver, const char member, Qt::ConnectionType=Qt::AutoConnection)
	Creates a connection of the given type from the signal in the sender object to the method in the receiver object. More...

static bool	connect (const QObject sender, const QMetaMethod &signal, const QObject receiver, const QMetaMethod &method, Qt::ConnectionType type=Qt::AutoConnection)

static bool	disconnect (const QObject sender, const char signal, const QObject receiver, const char member)
	Disconnects signal in object sender from method in object receiver. More...

static bool	disconnect (const QObject sender, const QMetaMethod &signal, const QObject receiver, const QMetaMethod &member)

static uint	registerUserData ()

static QString	tr (const char sourceText, const char comment=0, int n=-1)

static QString	trUtf8 (const char sourceText, const char comment=0, int n=-1)

Static Public Variables inherited from QObject
static const QMetaObject	staticMetaObject
	This variable stores the meta-object for the class. More...

Protected Slots inherited from QGraphicsTransform
void	update ()
	Notifies that this transform operation has changed its parameters in such a way that applyTo() will return a different result than before. More...

Protected Functions inherited from QGraphicsTransform
	QGraphicsTransform (QGraphicsTransformPrivate &p, QObject *parent)

Protected Functions inherited from QObject
virtual void	childEvent (QChildEvent *)
	This event handler can be reimplemented in a subclass to receive child events. More...

virtual void	connectNotify (const char *signal)
	This virtual function is called when something has been connected to signal in this object. More...

virtual void	customEvent (QEvent *)
	This event handler can be reimplemented in a subclass to receive custom events. More...

virtual void	disconnectNotify (const char *signal)
	This virtual function is called when something has been disconnected from signal in this object. More...

	QObject (QObjectPrivate &dd, QObject *parent=0)

int	receivers (const char *signal) const
	Returns the number of receivers connected to the signal. More...

QObject *	sender () const
	Returns a pointer to the object that sent the signal, if called in a slot activated by a signal; otherwise it returns 0. More...

int	senderSignalIndex () const

virtual void	timerEvent (QTimerEvent *)
	This event handler can be reimplemented in a subclass to receive timer events for the object. More...

Protected Variables inherited from QObject
QScopedPointer< QObjectData >	d_ptr

Static Protected Variables inherited from QObject
static const QMetaObject	staticQtMetaObject

Related Functions inherited from QObject
T	qFindChildqFindChildren (const QObject *obj, const QString &name)()

QList< T >	qFindChildrenqFindChildren (const QObject *obj, const QString &name)()

QList< T >	qFindChildrenqFindChildren (const QObject *obj, const QRegExp &regExp)()

T *	qobject_cast (QObject *object)

	QObjectList

void *	qt_find_obj_child (QObject parent, const char type, const QString &name)
	Returns a pointer to the object named name that inherits type and with a given parent. More...

Detailed Description

The QGraphicsScale class provides a scale transformation.

Since: 4.6

QGraphicsScene provides certain parameters to help control how the scale should be applied.

The origin is the point that the item is scaled from (i.e., it stays fixed relative to the parent as the rest of the item grows). By default the origin is QPointF(0, 0).

The parameters xScale, yScale, and zScale describe the scale factors to apply in horizontal, vertical, and depth directions. They can take on any value, including 0 (to collapse the item to a point) or negative value. A negative xScale value will mirror the item horizontally. A negative yScale value will flip the item vertically. A negative zScale will flip the item end for end.

See also: QGraphicsTransform, QGraphicsItem::setScale(), QTransform::scale()

Definition at line 83 of file qgraphicstransform.h.

Constructors and Destructors

◆ QGraphicsScale()

QGraphicsScale::QGraphicsScale ( QObject * parent = 0 )

Constructs an empty QGraphicsScale object with the given parent.

Definition at line 218 of file qgraphicstransform.cpp.

     : QGraphicsTransform(*new QGraphicsScalePrivate, parent)
 {
 }

◆ ~QGraphicsScale()

QGraphicsScale::~QGraphicsScale ( )

Destroys the graphics scale.

Definition at line 226 of file qgraphicstransform.cpp.

227 {

228 }

Functions

◆ applyTo()

void QGraphicsScale::applyTo ( QMatrix4x4 * matrix ) const

virtual

Reimplemented Function

Implements QGraphicsTransform.

Definition at line 350 of file qgraphicstransform.cpp.

 {
     Q_D(const QGraphicsScale);
     matrix->translate(d->origin);
     matrix->scale(d->xScale, d->yScale, d->zScale);
     matrix->translate(-d->origin);
 }

◆ origin()

QVector3D QGraphicsScale::origin ( ) const

Referenced by ~QGraphicsScale().

◆ originChanged

QGraphicsScale::originChanged ( )

signal

QGraphicsScale emits this signal when its origin changes.

See also: QGraphicsScale::origin

Referenced by setOrigin().

◆ scaleChanged

QGraphicsScale::scaleChanged ( )

signal

This signal is emitted whenever the xScale, yScale, or zScale of the object changes.

See also: QGraphicsScale::xScale, QGraphicsScale::yScale; QGraphicsScale::zScale

Referenced by setXScale(), setYScale(), and setZScale().

◆ setOrigin()

void QGraphicsScale::setOrigin ( const QVector3D & point )

Definition at line 247 of file qgraphicstransform.cpp.

 {
     Q_D(QGraphicsScale);
     if (d->origin == point)
         return;
     d->origin = point;
     update();
     emit originChanged();
 }

◆ setXScale()

void QGraphicsScale::setXScale ( qreal scale )

Definition at line 276 of file qgraphicstransform.cpp.

 {
     Q_D(QGraphicsScale);
     if (d->xScale == scale)
         return;
     d->xScale = scale;
     update();
     emit xScaleChanged();
     emit scaleChanged();
 }

◆ setYScale()

void QGraphicsScale::setYScale ( qreal scale )

Definition at line 306 of file qgraphicstransform.cpp.

 {
     Q_D(QGraphicsScale);
     if (d->yScale == scale)
         return;
     d->yScale = scale;
     update();
     emit yScaleChanged();
     emit scaleChanged();
 }

◆ setZScale()

void QGraphicsScale::setZScale ( qreal scale )

Definition at line 336 of file qgraphicstransform.cpp.

 {
     Q_D(QGraphicsScale);
     if (d->zScale == scale)
         return;
     d->zScale = scale;
     update();
     emit zScaleChanged();
     emit scaleChanged();
 }

◆ xScale()

qreal QGraphicsScale::xScale ( ) const

Referenced by setOrigin().

◆ xScaleChanged

QGraphicsScale::xScaleChanged ( )

signal

This signal is emitted whenever the xScale property changes.

Since: 4.7

Referenced by setXScale().

◆ yScale()

qreal QGraphicsScale::yScale ( ) const

Referenced by setXScale().

◆ yScaleChanged

QGraphicsScale::yScaleChanged ( )

signal

This signal is emitted whenever the yScale property changes.

Since: 4.7

Referenced by setYScale().

◆ zScale()

qreal QGraphicsScale::zScale ( ) const

Referenced by setYScale().

◆ zScaleChanged

QGraphicsScale::zScaleChanged ( )

signal

This signal is emitted whenever the zScale property changes.

Since: 4.7

Referenced by setZScale().

Properties

◆ origin

QVector3D QGraphicsScale::origin

private

the origin of the scale in 3D space.

All scaling will be done relative to this point (i.e., this point will stay fixed, relative to the parent, when the item is scaled).

See also: xScale, yScale, zScale

Definition at line 87 of file qgraphicstransform.h.

◆ xScale

qreal QGraphicsScale::xScale

private

the horizontal scale factor.

The scale factor can be any real number; the default value is 1.0. If you set the factor to 0.0, the item will be collapsed to a single point. If you provide a negative value, the item will be mirrored horizontally around its origin.

See also: yScale, zScale, origin

Definition at line 88 of file qgraphicstransform.h.

◆ yScale

qreal QGraphicsScale::yScale

private

the vertical scale factor.

The scale factor can be any real number; the default value is 1.0. If you set the factor to 0.0, the item will be collapsed to a single point. If you provide a negative value, the item will be flipped vertically around its origin.

See also: xScale, zScale, origin

Definition at line 89 of file qgraphicstransform.h.

◆ zScale

qreal QGraphicsScale::zScale

private

the depth scale factor.

The scale factor can be any real number; the default value is 1.0. If you set the factor to 0.0, the item will be collapsed to a single point. If you provide a negative value, the item will be flipped end for end around its origin.

See also: xScale, yScale, origin

Definition at line 90 of file qgraphicstransform.h.

The documentation for this class was generated from the following files:

/src/gui/graphicsview/qgraphicstransform.h
/src/gui/graphicsview/qgraphicstransform.cpp

Signals

Public Functions

Properties

Additional Inherited Members

Detailed Description

Constructors and Destructors

◆ QGraphicsScale()

◆ ~QGraphicsScale()

Functions

◆ applyTo()

◆ origin()

◆ originChanged

◆ scaleChanged

◆ setOrigin()

◆ setXScale()

◆ setYScale()

◆ setZScale()

◆ xScale()

◆ xScaleChanged

◆ yScale()

◆ yScaleChanged

◆ zScale()

◆ zScaleChanged

Properties

◆ origin

◆ xScale

◆ yScale

◆ zScale