內容

• 公共類型
• 特性
• 公共函數
• 公共槽
• 信號
• 詳細描述

QAxisAccumulator Class

( Qt3DInput::QAxisAccumulator )

QAxisAccumulator processes velocity or acceleration data from a QAxis . 更多...

頭：	#include <QAxisAccumulator>
qmake:	QT += 3dinput
Since:	Qt 5.8
實例化：	AxisAccumulator
繼承：	Qt3DCore::QComponent

• 所有成員列錶，包括繼承成員

公共類型

enum	SourceAxisType { Velocity, Acceleration }

特性

scale : float sourceAxis : Qt3DInput::QAxis * sourceAxisType : SourceAxisType

value : const float velocity : const float

• 1 特性繼承自 Qt3DCore::QComponent
• 3 特性繼承自 Qt3DCore::QNode
• 1 特性繼承自 QObject

公共函數

	QAxisAccumulator (Qt3DCore::QNode * parent = nullptr)
float	scale () const
Qt3DInput::QAxis *	sourceAxis () const
SourceAxisType	sourceAxisType () const
float	value () const
float	velocity () const

• 2 公共函數繼承自 Qt3DCore::QComponent
• 11 公共函數繼承自 Qt3DCore::QNode
• 32 公共函數繼承自 QObject

公共槽

void	setScale (float scale )
void	setSourceAxis (Qt3DInput::QAxis * sourceAxis )
void	setSourceAxisType (QAxisAccumulator::SourceAxisType sourceAxisType )

• 1 公共槽繼承自 Qt3DCore::QComponent
• 3 公共槽繼承自 Qt3DCore::QNode
• 1 公共槽繼承自 QObject

信號

void	scaleChanged (float scale )
void	sourceAxisChanged (Qt3DInput::QAxis * sourceAxis )
void	sourceAxisTypeChanged (QAxisAccumulator::SourceAxisType sourceAxisType )
void	valueChanged (float value )
void	velocityChanged (float value )

• 3 信號繼承自 Qt3DCore::QComponent
• 4 信號繼承自 Qt3DCore::QNode
• 2 信號繼承自 QObject

額外繼承成員

• 11 靜態公共成員繼承自 QObject
• 2 保護函數繼承自 Qt3DCore::QNode
• 9 保護函數繼承自 QObject

詳細描述

構造新的 QAxisAccumulator 實例與 parent .

QAxisAccumulator processes velocity or acceleration data from a QAxis .

A Qt3DInput::QAxis reports the current position of an axis on an input device. When the axis is returned to its neutral position the value of that axis returns to 0. Often, it is required to have the input from an axis control a variable in other ways, for example treating the value from the Qt3DInput::QAxis as a velocity (first derivative with respect to time) or as an acceleration (second derivative with respect to time). This can be done with user code or with a Qt3DLogic::QFrameAction but those approached are not ideal as they add more work to the main thread and are inherently imperative. The Qt3DInput::QAxisAccumulator class allows for this common task to be performed on the Qt 3D backend and be specified in a declarative manner.

成員類型文檔編製

enum QAxisAccumulator:: SourceAxisType

常量	值
Qt3DInput::QAxisAccumulator::Velocity	0
Qt3DInput::QAxisAccumulator::Acceleration	1

特性文檔編製

scale : float

訪問函數：

float	scale () const
void	setScale (float scale )

通知程序信號：

void	scaleChanged (float scale )

sourceAxis : Qt3DInput::QAxis *

訪問函數：

Qt3DInput::QAxis *	sourceAxis () const
void	setSourceAxis (Qt3DInput::QAxis * sourceAxis )

通知程序信號：

void	sourceAxisChanged (Qt3DInput::QAxis * sourceAxis )

sourceAxisType : SourceAxisType

訪問函數：

SourceAxisType	sourceAxisType () const
void	setSourceAxisType (QAxisAccumulator::SourceAxisType sourceAxisType )

通知程序信號：

void	sourceAxisTypeChanged (QAxisAccumulator::SourceAxisType sourceAxisType )

value : const float

Returns the accumulated (integrated) value.

訪問函數：

float

value () const

通知程序信號：

void	valueChanged (float value )

velocity : const float

訪問函數：

float

velocity () const

通知程序信號：

void	velocityChanged (float value )

成員函數文檔編製

QAxisAccumulator:: QAxisAccumulator ( Qt3DCore::QNode * parent = nullptr)

構造新的 QAxisAccumulator instance with parent parent .

float QAxisAccumulator:: scale () const

The amount to scale the axis value by when accumulating. This can be thought of as the maximum velocity or acceleration the axis can control.

Returns the amount the input axis values are scaled by.

注意： getter 函數對於特性 scale .

另請參閱 setScale ().

[slot] void QAxisAccumulator:: setSourceAxisType ( QAxisAccumulator::SourceAxisType sourceAxisType )

Sets how the accumulator treats the values originating from the sourceAxisType .

注意： setter 函數對於特性 sourceAxisType .

另請參閱 sourceAxisType ().

Qt3DInput::QAxis *QAxisAccumulator:: sourceAxis () const

返迴 QAxis for which the accumulator should integrate axis values.

注意： getter 函數對於特性 sourceAxis .

另請參閱 setSourceAxis ().

SourceAxisType QAxisAccumulator:: sourceAxisType () const

Returns how the accumulator treats the value of the sourceAxis .

注意： getter 函數對於特性 sourceAxisType .

另請參閱 setSourceAxisType ().

float QAxisAccumulator:: velocity () const

Returns the velocity. If the sourceAxisType is set to Velocity this is simply the value of the source axis multiplied by the scale. If the sourceAxisType is set to Acceleration, the velocity is integrated using the source axis' value as an acceleration.

注意： getter 函數對於特性 velocity .