内容

• 公共类型
• 特性
• 公共函数
• 公共槽
• 信号
• 详细描述

QAxisAccumulator Class

( Qt3DInput::QAxisAccumulator )

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

头：	#include <QAxisAccumulator>
qmake:	QT += 3dinput
Since:	Qt 5.8
实例化：	AxisAccumulator
继承：	Qt3DCore::QComponent

• 所有成员列表，包括继承成员

公共类型

enum	SourceAxisType { Velocity, Acceleration }

特性

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

value : const float velocity : const float

• 1 特性继承自 Qt3DCore::QComponent
• 3 特性继承自 Qt3DCore::QNode
• 1 特性继承自 QObject

公共函数

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

• 2 公共函数继承自 Qt3DCore::QComponent
• 11 公共函数继承自 Qt3DCore::QNode
• 32 公共函数继承自 QObject

公共槽

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

• 1 公共槽继承自 Qt3DCore::QComponent
• 3 公共槽继承自 Qt3DCore::QNode
• 1 公共槽继承自 QObject

信号

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

• 3 信号继承自 Qt3DCore::QComponent
• 4 信号继承自 Qt3DCore::QNode
• 2 信号继承自 QObject

额外继承成员

• 11 静态公共成员继承自 QObject
• 2 保护函数继承自 Qt3DCore::QNode
• 9 保护函数继承自 QObject

详细描述

构造新的 QAxisAccumulator 实例与 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.

成员类型文档编制

enum QAxisAccumulator:: SourceAxisType

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

特性文档编制

scale : float

访问函数：

float	scale () const
void	setScale (float scale )

通知程序信号：

void	scaleChanged (float scale )

sourceAxis : Qt3DInput::QAxis *

访问函数：

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

通知程序信号：

void	sourceAxisChanged (Qt3DInput::QAxis * sourceAxis )

sourceAxisType : SourceAxisType

访问函数：

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

通知程序信号：

void	sourceAxisTypeChanged (QAxisAccumulator::SourceAxisType sourceAxisType )

value : const float

Returns the accumulated (integrated) value.

访问函数：

float

value () const

通知程序信号：

void	valueChanged (float value )

velocity : const float

访问函数：

float

velocity () const

通知程序信号：

void	velocityChanged (float value )

成员函数文档编制

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

构造新的 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 函数对于特性 scale .

另请参阅 setScale ().

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

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

注意： Setter 函数对于特性 sourceAxisType .

另请参阅 sourceAxisType ().

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

返回 QAxis for which the accumulator should integrate axis values.

注意： Getter 函数对于特性 sourceAxis .

另请参阅 setSourceAxis ().

SourceAxisType QAxisAccumulator:: sourceAxisType () const

Returns how the accumulator treats the value of the sourceAxis .

注意： Getter 函数对于特性 sourceAxisType .

另请参阅 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 函数对于特性 velocity .