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

#include <qgraphicstransform.h>

Inheritance diagram for QGraphicsRotation:

Collaboration diagram for QGraphicsRotation:

Signals
void	originChanged ()

void	angleChanged ()

void	axisChanged ()

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

void	objectNameChanged (const QString &objectName, QPrivateSignal)

Public Member Functions
	QGraphicsRotation (QObject *parent=nullptr)

	~QGraphicsRotation ()

QVector3D	origin () const

void	setOrigin (const QVector3D &point)

qreal	angle () const

void	setAngle (qreal)

QVector3D	axis () const

void	setAxis (const QVector3D &axis)

void	setAxis (Qt::Axis axis)

void	applyTo (QMatrix4x4 *matrix) const override

Public Member Functions inherited from QGraphicsTransform
	QGraphicsTransform (QObject *parent=nullptr)

	~QGraphicsTransform ()

Public Member Functions inherited from QObject
Q_INVOKABLE	QObject (QObject *parent=nullptr)

virtual	~QObject ()

virtual bool	event (QEvent *event)

virtual bool	eventFilter (QObject watched, QEvent event)

QString	objectName () const

void	setObjectName (const QString &name)

QBindable< QString >	bindableObjectName ()

bool	isWidgetType () const

bool	isWindowType () const

bool	signalsBlocked () const noexcept

bool	blockSignals (bool b) noexcept

QThread *	thread () const

void	moveToThread (QThread *thread)

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

void	killTimer (int id)

template<typename T >
T	findChild (const QString &aName=QString(), Qt::FindChildOptions options=Qt::FindChildrenRecursively) const

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

template<typename T >
QList< T >	findChildren (Qt::FindChildOptions options=Qt::FindChildrenRecursively) const

const QObjectList &	children () const

void	setParent (QObject *parent)

void	installEventFilter (QObject *filterObj)

void	removeEventFilter (QObject *obj)

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

void	dumpObjectInfo () const

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

QVariant	property (const char *name) const

QList< QByteArray >	dynamicPropertyNames () const

QBindingStorage *	bindingStorage ()

const QBindingStorage *	bindingStorage () const

QObject *	parent () const

bool	inherits (const char *classname) const

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

qreal	angle
	the angle for clockwise rotation, in degrees. More...

QVector3D	axis
	a rotation axis, specified by a vector in 3D space. More...

Properties inherited from QObject
QString	objectName
	the name of this object More...

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

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)

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::FunctionPointer< Func2 >::Object receiver, Func2 slot, Qt::ConnectionType type=Qt::AutoConnection)

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

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

template<typename Func1 , typename Func2 >
static std::enable_if< QtPrivate::FunctionPointer< Func2 >::ArgumentCount==-1 &&!std::is_convertible_v< Func2, const char * >, QMetaObject::Connection >::type	connect (const typename QtPrivate::FunctionPointer< Func1 >::Object *sender, Func1 signal, Func2 slot)

template<typename Func1 , typename Func2 >
static std::enable_if< QtPrivate::FunctionPointer< Func2 >::ArgumentCount==-1 &&!std::is_convertible_v< Func2, const char * >, QMetaObject::Connection >::type	connect (const typename QtPrivate::FunctionPointer< Func1 >::Object sender, Func1 signal, const QObject context, Func2 slot, Qt::ConnectionType type=Qt::AutoConnection)

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

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

static bool	disconnect (const QMetaObject::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 ()

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

Protected Member Functions inherited from QObject
QObject *	sender () const

int	senderSignalIndex () const

int	receivers (const char *signal) const

bool	isSignalConnected (const QMetaMethod &signal) const

virtual void	timerEvent (QTimerEvent *event)

virtual void	childEvent (QChildEvent *event)

virtual void	customEvent (QEvent *event)

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 Functions inherited from QObject
template< class T > T	qobject_cast (const QObject *object)

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

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

	QObjectList

Detailed Description

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

Since: 4.6 \inmodule QtWidgets

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 convenience function. By default the axis is (0, 0, 1) i.e., rotation around the Z axis.

The angle property, which is provided by QGraphicsRotation, now describes the number of degrees to rotate around this axis.

QGraphicsRotation provides certain parameters to help control how the rotation should be applied.

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.

Note: 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()

Definition at line 118 of file qgraphicstransform.h.

Constructor & Destructor Documentation

◆ QGraphicsRotation()

QGraphicsRotation::QGraphicsRotation ( QObject * parent = nullptr )

Constructs a new QGraphicsRotation with the given parent.

Definition at line 431 of file qgraphicstransform.cpp.

◆ ~QGraphicsRotation()

QGraphicsRotation::~QGraphicsRotation ( )

Destroys the graphics rotation.

Definition at line 439 of file qgraphicstransform.cpp.

Member Function Documentation

◆ angle()

qreal QGraphicsRotation::angle ( ) const

Definition at line 480 of file qgraphicstransform.cpp.

◆ angleChanged

void QGraphicsRotation::angleChanged ( )

signal

This signal is emitted whenever the angle has changed.

See also: QGraphicsRotation::angle

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◆ applyTo()

void QGraphicsRotation::applyTo ( QMatrix4x4 * matrix ) const

overridevirtual

\reimp

Implements QGraphicsTransform.

Definition at line 576 of file qgraphicstransform.cpp.

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◆ axis()

QVector3D QGraphicsRotation::axis ( ) const

Definition at line 523 of file qgraphicstransform.cpp.

◆ axisChanged

void QGraphicsRotation::axisChanged ( )

signal

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

See also: QGraphicsRotation::axis

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◆ origin()

QVector3D QGraphicsRotation::origin ( ) const

Definition at line 452 of file qgraphicstransform.cpp.

◆ originChanged

QGraphicsRotation::originChanged ( )

signal

This signal is emitted whenever the origin has changed.

See also: QGraphicsRotation::origin

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◆ setAngle()

void QGraphicsRotation::setAngle ( qreal angle )

Definition at line 485 of file qgraphicstransform.cpp.

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◆ setAxis() [1/2]

void QGraphicsRotation::setAxis ( const QVector3D & axis )

Definition at line 528 of file qgraphicstransform.cpp.

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◆ setAxis() [2/2]

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

Convenience function to set the axis to axis.

Note: the Qt::YAxis rotation for QTransform is inverted from the correct mathematical rotation in 3D space. The QGraphicsRotation class implements a correct mathematical rotation. The following two sequences of code will perform the same transformation:

QTransform t;
t.rotate(45, Qt::YAxis);
 
QGraphicsRotation r;
r.setAxis(Qt::YAxis);
r.setAngle(-45);

Definition at line 557 of file qgraphicstransform.cpp.

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◆ setOrigin()

void QGraphicsRotation::setOrigin ( const QVector3D & point )

Definition at line 457 of file qgraphicstransform.cpp.

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Property Documentation

◆ angle

QGraphicsRotation::angle

readwrite

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), but you can also provide numbers outside of this range (e.g., a angle of 370 degrees gives the same result as 10 degrees). Setting the angle to NaN results in no rotation.

See also: origin

Definition at line 110 of file qgraphicstransform.h.

◆ axis

QGraphicsRotation::axis

readwrite

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

Definition at line 110 of file qgraphicstransform.h.

◆ origin

QGraphicsRotation::origin

readwrite

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

Definition at line 110 of file qgraphicstransform.h.

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

src/widgets/graphicsview/qgraphicstransform.h
src/widgets/graphicsview/qgraphicstransform.cpp

Signals

Public Member Functions

Properties

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

◆ QGraphicsRotation()

◆ ~QGraphicsRotation()

Member Function Documentation

◆ angle()

◆ angleChanged

◆ applyTo()

◆ axis()

◆ axisChanged

◆ origin()

◆ originChanged

◆ setAngle()

◆ setAxis() [1/2]

◆ setAxis() [2/2]

◆ setOrigin()

Property Documentation

◆ angle

◆ axis

◆ origin