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

#include <qgraphicstransform.h>

Inheritance diagram for QGraphicsScale:

Collaboration diagram for QGraphicsScale:

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

void	xScaleChanged ()

void	yScaleChanged ()

void	zScaleChanged ()

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

Signals inherited from QObject
void	destroyed (QObject *=nullptr)
	This signal is emitted immediately before the object obj is destroyed, after any instances of QPointer have been notified, and cannot be blocked.

void	objectNameChanged (const QString &objectName, QPrivateSignal)
	This signal is emitted after the object's name has been changed.

Public Member Functions
	QGraphicsScale (QObject *parent=nullptr)
	Constructs an empty QGraphicsScale object with the given parent.

	~QGraphicsScale ()
	Destroys the graphics scale.

QVector3D	origin () const

void	setOrigin (const QVector3D &point)

qreal	xScale () const

void	setXScale (qreal)

qreal	yScale () const

void	setYScale (qreal)

qreal	zScale () const

void	setZScale (qreal)

void	applyTo (QMatrix4x4 *matrix) const override
	\reimp

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

	~QGraphicsTransform ()
	Destroys the graphics transform.

Public Member Functions inherited from QObject
Q_INVOKABLE	QObject (QObject *parent=nullptr)
	Constructs an object with parent object parent.

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

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

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

QString	objectName () const

Q_WEAK_OVERLOAD void	setObjectName (const QString &name)
	Sets the object's name to name.

void	setObjectName (QAnyStringView name)
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

QBindable< QString >	bindableObjectName ()

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

bool	isWindowType () const
	Returns `true` if the object is a window; otherwise returns `false`.

bool	isQuickItemType () const
	Returns `true` if the object is a QQuickItem; otherwise returns `false`.

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

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

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

bool	moveToThread (QThread *thread QT6_DECL_NEW_OVERLOAD_TAIL)
	Changes the thread affinity for this object and its children and returns `true` on success.

int	startTimer (int interval, Qt::TimerType timerType=Qt::CoarseTimer)
	This is an overloaded function that will start a timer of type timerType and a timeout of interval milliseconds.

int	startTimer (std::chrono::nanoseconds time, Qt::TimerType timerType=Qt::CoarseTimer)

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

void	killTimer (Qt::TimerId id)

template<typename T >
T	findChild (QAnyStringView aName, Qt::FindChildOptions options=Qt::FindChildrenRecursively) const
	Returns the child of this object that can be cast into type T and that is called name, or \nullptr if there is no such object.

template<typename T >
QList< T >	findChildren (QAnyStringView aName, Qt::FindChildOptions options=Qt::FindChildrenRecursively) 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.

template<typename T >
T	findChild (Qt::FindChildOptions options=Qt::FindChildrenRecursively) const
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

template<typename T >
QList< T >	findChildren (Qt::FindChildOptions options=Qt::FindChildrenRecursively) const
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

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

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

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

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

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

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

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

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

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

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

bool	setProperty (const char *name, QVariant &&value)

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

QList< QByteArray >	dynamicPropertyNames () const

QBindingStorage *	bindingStorage ()

const QBindingStorage *	bindingStorage () const

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

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`.

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

qreal	xScale
	the horizontal scale factor.

qreal	yScale
	the vertical scale factor.

qreal	zScale
	the depth scale factor.

Properties inherited from QObject
QString	objectName
	the name of this object

Additional Inherited Members
Public Slots inherited from QObject
void	deleteLater ()
	\threadsafe

Static Public Member Functions inherited from QObject
static QMetaObject::Connection	connect (const QObject sender, const char signal, const QObject receiver, const char member, Qt::ConnectionType=Qt::AutoConnection)
	\threadsafe

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

template<typename Func1 , typename Func2 >
static QMetaObject::Connection	connect (const typename QtPrivate::FunctionPointer< Func1 >::Object sender, Func1 signal, const typename QtPrivate::ContextTypeForFunctor< Func2 >::ContextType context, Func2 &&slot, Qt::ConnectionType type=Qt::AutoConnection)

template<typename Func1 , typename Func2 >
static QMetaObject::Connection	connect (const typename QtPrivate::FunctionPointer< Func1 >::Object *sender, Func1 signal, Func2 &&slot)

static bool	disconnect (const QObject sender, const char signal, const QObject receiver, const char member)
	\threadsafe

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

static bool	disconnect (const QMetaObject::Connection &)
	Disconnect a connection.

template<typename Func1 , typename Func2 >
static bool	disconnect (const typename QtPrivate::FunctionPointer< Func1 >::Object sender, Func1 signal, const typename QtPrivate::FunctionPointer< Func2 >::Object receiver, Func2 slot)

template<typename Func1 >
static bool	disconnect (const typename QtPrivate::FunctionPointer< Func1 >::Object sender, Func1 signal, const QObject receiver, void **zero)

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.

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

Protected Member Functions inherited from QObject
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 \nullptr.

int	senderSignalIndex () const

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

bool	isSignalConnected (const QMetaMethod &signal) const

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

virtual void	childEvent (QChildEvent *event)
	This event handler can be reimplemented in a subclass to receive child events.

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

virtual void	connectNotify (const QMetaMethod &signal)

virtual void	disconnectNotify (const QMetaMethod &signal)

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

Protected Attributes inherited from QObject
QScopedPointer< QObjectData >	d_ptr

Related Symbols inherited from QObject
template< class T > T	qobject_cast (const QObject *object)
	Returns the given object cast to type T if the object is of type T (or of a subclass); otherwise returns \nullptr.

template< typename T > T	qFindChildqFindChildren (const QObject *obj, const QString &name)()

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

	QObjectList
	\macro Q_CLASSINFO(Name, Value)

Detailed Description

The QGraphicsScale class provides a scale transformation.

Since: 4.6 \inmodule QtWidgets

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 43 of file qgraphicstransform.h.

Constructor & Destructor Documentation

◆ QGraphicsScale()

QGraphicsScale::QGraphicsScale ( QObject * parent = nullptr )

Constructs an empty QGraphicsScale object with the given parent.

Definition at line 180 of file qgraphicstransform.cpp.

◆ ~QGraphicsScale()

QGraphicsScale::~QGraphicsScale ( )

Destroys the graphics scale.

Definition at line 188 of file qgraphicstransform.cpp.

Member Function Documentation

◆ applyTo()

void QGraphicsScale::applyTo ( QMatrix4x4 * matrix ) const

overridevirtual

\reimp

Implements QGraphicsTransform.

Definition at line 300 of file qgraphicstransform.cpp.

References d.

◆ origin()

QVector3D QGraphicsScale::origin ( ) const

Definition at line 201 of file qgraphicstransform.cpp.

References d.

◆ originChanged

QGraphicsScale::originChanged ( )

signal

QGraphicsScale emits this signal when its origin changes.

See also: QGraphicsScale::origin

Referenced by setOrigin().

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◆ 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().

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◆ setOrigin()

void QGraphicsScale::setOrigin ( const QVector3D & point )

Definition at line 206 of file qgraphicstransform.cpp.

References d, emit, originChanged(), and QGraphicsTransform::update().

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◆ setXScale()

void QGraphicsScale::setXScale ( qreal scale )

Definition at line 232 of file qgraphicstransform.cpp.

References d, emit, scaleChanged(), QGraphicsTransform::update(), and xScaleChanged().

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◆ setYScale()

void QGraphicsScale::setYScale ( qreal scale )

Definition at line 259 of file qgraphicstransform.cpp.

References d, emit, scaleChanged(), QGraphicsTransform::update(), and yScaleChanged().

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◆ setZScale()

void QGraphicsScale::setZScale ( qreal scale )

Definition at line 286 of file qgraphicstransform.cpp.

References d, emit, scaleChanged(), QGraphicsTransform::update(), and zScaleChanged().

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◆ xScale()

qreal QGraphicsScale::xScale ( ) const

Definition at line 227 of file qgraphicstransform.cpp.

References d.

◆ xScaleChanged

QGraphicsScale::xScaleChanged ( )

signal

Since: 4.7

This signal is emitted whenever the \l xScale property changes.

Referenced by setXScale().

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◆ yScale()

qreal QGraphicsScale::yScale ( ) const

Definition at line 254 of file qgraphicstransform.cpp.

References d.

◆ yScaleChanged

QGraphicsScale::yScaleChanged ( )

signal

Since: 4.7

This signal is emitted whenever the \l yScale property changes.

Referenced by setYScale().

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◆ zScale()

qreal QGraphicsScale::zScale ( ) const

Definition at line 281 of file qgraphicstransform.cpp.

References d.

◆ zScaleChanged

QGraphicsScale::zScaleChanged ( )

signal

Since: 4.7

This signal is emitted whenever the \l zScale property changes.

Referenced by setZScale().

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Property Documentation

◆ origin

QGraphicsScale::origin

readwrite

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 47 of file qgraphicstransform.h.

◆ xScale

QGraphicsScale::xScale

readwrite

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 48 of file qgraphicstransform.h.

◆ yScale

QGraphicsScale::yScale

readwrite

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 49 of file qgraphicstransform.h.

◆ zScale

QGraphicsScale::zScale

readwrite

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 50 of file qgraphicstransform.h.

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

qtbase/src/widgets/graphicsview/qgraphicstransform.h (05fc3aef53348fb58be6308076e000825b704e58)
qtbase/src/widgets/graphicsview/qgraphicstransform.cpp (23bf260f10f4b507e2e19398a16574ca77fe774d)

Signals

Public Member Functions

Properties

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

◆ QGraphicsScale()

◆ ~QGraphicsScale()

Member Function Documentation

◆ applyTo()

◆ origin()

◆ originChanged

◆ scaleChanged

◆ setOrigin()

◆ setXScale()

◆ setYScale()

◆ setZScale()

◆ xScale()

◆ xScaleChanged

◆ yScale()

◆ yScaleChanged

◆ zScale()

◆ zScaleChanged

Property Documentation

◆ origin

◆ xScale

◆ yScale

◆ zScale