The QGraphicsRotation class provides a rotation transformation around a given axis. More...

Inheritance diagram for QGraphicsRotation:

Public Signals
void	angleChanged ()

void	axisChanged ()

void	originChanged ()

Public Signals inherited from QObject
void	destroyed (QObject *obj=nullptr)

void	objectNameChanged (const QString &objectName)

Public Methods
	QGraphicsRotation (QObject *parent=nullptr)

	~QGraphicsRotation ()

qreal	angle () const

void	applyTo (QMatrix4x4 *matrix) const override

QVector3D	axis () const

QVector3D	origin () const

void	setAngle (qreal value)

void	setAxis (const QVector3D &axis)

void	setAxis (Qt::Axis axis)

void	setOrigin (const QVector3D &point)

Public Methods inherited from QGraphicsTransform
	QGraphicsTransform (QObject *parent=nullptr)

	~QGraphicsTransform ()

Public Methods inherited from QObject
	QObject (QObject *parent=nullptr)

	~QObject ()

bool	blockSignals (bool block)

const QList< QObject * > &	children () const

bool	connect (const QObject *sender, const QString &signalMethod, const QString &location, const QString &slotMethod, Qt::ConnectionType type=Qt::AutoConnection)

bool	connect (const QObject *sender, const QString &signalMethod, const QString &slotMethod, Qt::ConnectionType type=Qt::AutoConnection)

bool	disconnect (const QObject *receiver, const QString &slotMethod=QString ()) const

bool	disconnect (const QString &signalMethod, const QString &location, const QObject *receiver=nullptr, const QString &slotMethod=QString ()) const

bool	disconnect (const QString &signalMethod=QString (), const QObject *receiver=nullptr, const QString &slotMethod=QString ()) const

void	dumpObjectInfo ()

void	dumpObjectTree ()

QList< QString >	dynamicPropertyNames () const

virtual bool	event (QEvent *event)

virtual bool	eventFilter (QObject watched, QEvent event)

template<typename T >
T	findChild (const QString &childName=QString ()) const

template<class T >
QList< T >	findChildren (const QRegularExpression &regExp, Qt::FindChildOptions options=Qt::FindChildrenRecursively) const

template<class T >
QList< T >	findChildren (const QString &childName=QString (), Qt::FindChildOptions options=Qt::FindChildrenRecursively) const

bool	inherits (const QString &className) const

void	installEventFilter (QObject *filterObj)

bool	isWidgetType () const

bool	isWindowType () const

void	killTimer (int id)

const QMetaObject *	metaObject () const

void	moveToThread (QThread *targetThread)

QString	objectName () const

QObject *	parent () const

template<class T = QVariant>
T	property (const QString &name) const

void	removeEventFilter (QObject *obj)

void	setObjectName (const QString &name)

void	setParent (QObject *parent)

bool	setProperty (const QString &name, const QVariant &value)

bool	signalsBlocked () const

int	startTimer (int interval, Qt::TimerType timerType=Qt::CoarseTimer)

QThread *	thread () const

Properties
	angle

	axis

	origin

Properties inherited from QObject
	objectName

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

Static Public Methods inherited from QObject
static bool	connect (const QObject sender, const QMetaMethod &signalMethod, const QObject receiver, const QMetaMethod &slotMethod, Qt::ConnectionType type=Qt::AutoConnection)

static bool	connect (const QObject sender, const QString &signalMethod, const QObject receiver, const QString &slotMethod, Qt::ConnectionType type=Qt::AutoConnection, const QString &location=QString ())

static bool	connect (const QObject sender, const QString &signalMethod, const QString &location, const QObject receiver, const QString &slotMethod, Qt::ConnectionType type=Qt::AutoConnection)

template<class Sender , class SignalClass , class... SignalArgs, class Receiver , class SlotClass , class... SlotArgs, class SlotReturn >
static bool	connect (const Sender sender, void (SignalClass::signalMethod)(SignalArgs...), const Receiver receiver, SlotReturn (SlotClass::slotMethod)(SlotArgs...), Qt::ConnectionType type=Qt::AutoConnection)

template<class Sender , class SignalClass , class... SignalArgs, class Receiver , class T >
static bool	connect (const Sender sender, void (SignalClass::signalMethod)(SignalArgs...), const Receiver *receiver, T slotLambda, Qt::ConnectionType type=Qt::AutoConnection)

static bool	disconnect (const QObject sender, const QMetaMethod &signalMethod, const QObject receiver, const QMetaMethod &slotMethod)

static bool	disconnect (const QObject sender, const QString &signalMethod, const QObject receiver, const QString &slotMethod)

static bool	disconnect (const QObject sender, const QString &signalMethod, const QString &location, const QObject receiver, const QString &slotMethod)

static bool	disconnect (const QObject sender, std::nullptr_t, const QObject receiver, std::nullptr_t)

template<class Sender , class SignalClass , class... SignalArgs, class Receiver , class SlotClass , class... SlotArgs, class SlotReturn >
static bool	disconnect (const Sender sender, void (SignalClass::signalMethod)(SignalArgs...), const Receiver receiver, SlotReturn (SlotClass::slotMethod)(SlotArgs...))

template<class Sender , class SignalClass , class... SignalArgs, class Receiver >
static bool	disconnect (const Sender sender, void (SignalClass::signalMethod)(SignalArgs...), const Receiver *receiver, std::nullptr_t slotMethod=nullptr)

template<class Sender , class SignalClass , class... SignalArgs, class Receiver , class T >
static bool	disconnect (const Sender sender, void (SignalClass::signalMethod)(SignalArgs...), const Receiver *receiver, T slotMethod)

static QMetaObject &	staticMetaObject ()

static QString	tr (const char text, const char comment=nullptr, std::optional< int > numArg=std::optional< int >())

Protected Slots inherited from QGraphicsTransform
void	update ()

Protected Methods inherited from QObject
virtual void	childEvent (QChildEvent *event)

virtual void	connectNotify (const QMetaMethod &signalMethod) const

virtual void	customEvent (QEvent *event)

virtual void	disconnectNotify (const QMetaMethod &signalMethod) const

bool	isSignalConnected (const QMetaMethod &signalMethod) const

int	receivers (const QString &signal) const

QObject *	sender () const

int	senderSignalIndex () const

virtual void	timerEvent (QTimerEvent *event)

Related Functions inherited from QObject
T	qobject_cast (QObject *object)

	QObjectList

Detailed Description

The QGraphicsRotation class provides a rotation transformation around a given axis. This class has various parameters to help control how the rotation should be applied.

You can provide the desired axis by assigning a QVector3D to the axis property or by passing a member if Qt::Axis to the setAxis() method. By default the axis is (0, 0, 1) which is a rotation around the Z axis. The angle property in QGraphicsRotation, describes the number of degrees to rotate around this axis. The origin is the point that the item is rotated around (i.e., it stays fixed relative to the parent as the rest of the item is rotated). By default the origin is QPointF(0, 0).

The angle property provides the number of degrees to rotate the item clockwise around the origin. This value also be negative, indicating a counter-clockwise rotation. For animation purposes it may also be useful to provide rotation angles exceeding (-360, 360) degrees, for instance to animate how an item rotates several times.

The final rotation is the combined effect of a rotation in 3D space followed by a projection back to 2D. If several rotations are performed in succession, they will not behave as expected unless they were all around the Z axis.

See also: QGraphicsTransform, QGraphicsItem::setRotation(), QTransform::rotate()

Constructor & Destructor Documentation

QGraphicsRotation::QGraphicsRotation ( QObject * parent = nullptr )

Constructs a new QGraphicsRotation with the given parent.

QGraphicsRotation::~QGraphicsRotation ( )

Destroys the graphics rotation.

Method Documentation

qreal QGraphicsRotation::angle ( ) const

Returns the value of the property.

void QGraphicsRotation::angleChanged ( )

signal

This signal is emitted whenever the angle has changed.

See also: QGraphicsRotation::angle

void QGraphicsRotation::applyTo ( QMatrix4x4 * matrix ) const

overridevirtual

Implements QGraphicsTransform::applyTo()

QVector3D QGraphicsRotation::axis ( ) const

Returns the value of the property.

void QGraphicsRotation::axisChanged ( )

signal

This signal is emitted whenever the axis of the object changes.

See also: QGraphicsRotation::axis

QVector3D QGraphicsRotation::origin ( ) const

Returns the value of the property.

void QGraphicsRotation::originChanged ( )

signal

This signal is emitted whenever the origin has changed.

See also: QGraphicsRotation::origin

void QGraphicsRotation::setAngle ( qreal value )

Sets the value of the property to value.

void QGraphicsRotation::setAxis ( const QVector3D & axis )

Sets the value of the property to axis.

void QGraphicsRotation::setAxis ( Qt::Axis axis )

Sets the value of the property to axis.

void QGraphicsRotation::setOrigin ( const QVector3D & point )

Sets the value of the property to point.

Property Documentation

QGraphicsRotation::angle

This property holds the angle for clockwise rotation, in degrees.

The angle can be any real number, the default value is 0.0. A value of 180 will rotate 180 degrees clockwise. If you provide a negative number the item will be rotated counter-clockwise.

Normally the rotation angle will be in the range (-360, 360) however it is permissible to provide values outside of this range. For example, an angle of 370 degrees gives the same result as 10 degrees. Setting the angle to NaN results in no rotation.

See also: origin

Properties	Class Methods
read	angle
write	setAngle
notify	angleChanged

QGraphicsRotation::axis

This property holds a rotation axis, specified by a vector in 3D space.

This can be any axis in 3D space. By default the axis is (0, 0, 1), which is aligned with the Z axis. If you provide another axis, QGraphicsRotation will provide a transformation that rotates around this axis. For example, if you would like to rotate an item around its X axis, you could pass (1, 0, 0) as the axis.

See also: QTransform, QGraphicsRotation::angle

Properties	Class Methods
read	axis
write	setAxis
notify	axisChanged

QGraphicsRotation::origin

This property holds the origin of the rotation in 3D space. All rotations will be done relative to this point (i.e., this point will stay fixed, relative to the parent, when the item is rotated).

See also: angle

Properties	Class Methods
read	origin
write	setOrigin
notify	originChanged

Public Signals

Public Methods

Properties

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

Method Documentation

Property Documentation