內容

• 特性
• 公共函數
• 重實現公共函數
• 信號
• 詳細描述

QGraphicsScale 類

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

頭：	#include <QGraphicsScale>
qmake:	QT += widgets
Since:	Qt 4.6
繼承：	QGraphicsTransform

• 所有成員列錶，包括繼承成員

特性

• origin : QVector3D
• xScale : qreal
• yScale : qreal
• zScale : qreal

• 1 特性繼承自 QObject

公共函數

	QGraphicsScale (QObject * parent = Q_NULLPTR)
	~QGraphicsScale ()
QVector3D	origin () const
void	setOrigin (const QVector3D & point )
void	setXScale ( qreal )
void	setYScale ( qreal )
void	setZScale ( qreal )
qreal	xScale () const
qreal	yScale () const
qreal	zScale () const

重實現公共函數

virtual void

applyTo (QMatrix4x4 * matrix ) const

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

信號

void	originChanged ()
void	scaleChanged ()
void	xScaleChanged ()
void	yScaleChanged ()
void	zScaleChanged ()

• 2 信號繼承自 QObject

額外繼承成員

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

詳細描述

The QGraphicsScale class provides a scale transformation.

QGraphicsScene 提供幫助控製應如何應用比例縮放的某些參數。

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).

參數 xScale , yScale ，和 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.

另請參閱 QGraphicsTransform , QGraphicsItem::setScale ()，和 QTransform::scale ().

特性文檔編製

origin : QVector3D

This property holds 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).

訪問函數：

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

通知程序信號：

void	originChanged ()

另請參閱 xScale , yScale ，和 zScale .

xScale : qreal

This property holds 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.

訪問函數：

qreal	xScale () const
void	setXScale ( qreal )

通知程序信號：

void	xScaleChanged ()

另請參閱 yScale , zScale ，和 origin .

yScale : qreal

This property holds 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.

訪問函數：

qreal	yScale () const
void	setYScale ( qreal )

通知程序信號：

void	yScaleChanged ()

另請參閱 xScale , zScale ，和 origin .

zScale : qreal

This property holds 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.

訪問函數：

qreal	zScale () const
void	setZScale ( qreal )

通知程序信號：

void	zScaleChanged ()

另請參閱 xScale , yScale ，和 origin .

成員函數文檔編製

QGraphicsScale:: QGraphicsScale ( QObject * parent = Q_NULLPTR)

構造空的 QGraphicsScale 對象采用給定 parent .

QGraphicsScale:: ~QGraphicsScale ()

Destroys the graphics scale.

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

重實現自 QGraphicsTransform::applyTo ().

[signal] void QGraphicsScale:: originChanged ()

QGraphicsScale emits this signal when its origin changes.

注意： 通知程序信號對於特性 origin .

另請參閱 QGraphicsScale::origin .

[signal] void QGraphicsScale:: scaleChanged ()

此信號被發射每當 xScale , yScale ，或 zScale of the object changes.

另請參閱 QGraphicsScale::xScale , QGraphicsScale::yScale ，和 QGraphicsScale::zScale .

[signal] void QGraphicsScale:: xScaleChanged ()

此信號被發射每當 xScale 特性改變。

該函數在 Qt 4.7 引入。

注意： 通知程序信號對於特性 xScale .

[signal] void QGraphicsScale:: yScaleChanged ()

此信號被發射每當 yScale 特性改變。

該函數在 Qt 4.7 引入。

注意： 通知程序信號對於特性 yScale .

[signal] void QGraphicsScale:: zScaleChanged ()

此信號被發射每當 zScale 特性改變。

該函數在 Qt 4.7 引入。

注意： 通知程序信號對於特性 zScale .