內容

• 特性
• 公共函數
• 重實現公共函數
• 信號
• 詳細描述

QGraphicsRotation 類

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

頭：	#include <QGraphicsRotation>
Since:	Qt 4.6
實例化：	Rotation
繼承：	QGraphicsTransform

• 所有成員列錶，包括繼承成員

特性

• angle : qreal
• axis : QVector3D
• origin : QVector3D

• 1 特性繼承自 QObject

公共函數

	QGraphicsRotation (QObject * parent = 0)
	~QGraphicsRotation ()
qreal	angle () const
QVector3D	axis () const
QVector3D	origin () const
void	setAngle (qreal)
void	setAxis (const QVector3D & axis )
void	setAxis (Qt::Axis axis )
void	setOrigin (const QVector3D & point )

重實現公共函數

virtual void

applyTo (QMatrix4x4 * matrix ) const

• 1 公共函數繼承自 QGraphicsTransform
• 29 公共函數繼承自 QObject

信號

void	angleChanged ()
void	axisChanged ()
void	originChanged ()

• 1 信號繼承自 QObject

額外繼承成員

• 1 公共槽繼承自 QObject
• 7 靜態公共成員繼承自 QObject
• 8 保護函數繼承自 QObject
• 1 保護槽繼承自 QGraphicsTransform

詳細描述

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

You can provide the desired axis by assigning a QVector3D to the axis property or by passing a member if Qt::Axis 到 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.

另請參閱 QGraphicsTransform , QGraphicsItem::setRotation ()，和 QTransform::rotate ().

特性文檔編製

angle : qreal

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), 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.

訪問函數：

qreal	angle () const
void	setAngle (qreal)

通知程序信號：

void	angleChanged ()

另請參閱 origin .

axis : QVector3D

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.

訪問函數：

QVector3D	axis () const
void	setAxis (const QVector3D & axis )
void	setAxis (Qt::Axis axis )

通知程序信號：

void	axisChanged ()

另請參閱 QTransform and QGraphicsRotation::angle .

origin : QVector3D

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).

訪問函數：

QVector3D	origin () const
void	setOrigin (const QVector3D & point )

通知程序信號：

void	originChanged ()

另請參閱 angle .

成員函數文檔編製

QGraphicsRotation:: QGraphicsRotation ( QObject * parent = 0)

構造新的 QGraphicsRotation 采用給定 parent .

QGraphicsRotation:: ~QGraphicsRotation ()

Destroys the graphics rotation.

[虛擬] void QGraphicsRotation:: applyTo ( QMatrix4x4 * matrix ) const

重實現自 QGraphicsTransform::applyTo ().