QAxisAccumulator Class

(Qt3DInput::QAxisAccumulator)

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

Header:	#include <QAxisAccumulator>
qmake:	QT += 3dinput
Since:	Qt 5.8
Instantiated By:	AxisAccumulator
Inherits:	Qt3DCore::QComponent

• List of all members, including inherited members
• Obsolete members

Public Types

enum	SourceAxisType { Velocity, Acceleration }

Properties

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

value : const float velocity : const float

• 1 property inherited from Qt3DCore::QComponent
• 3 properties inherited from Qt3DCore::QNode
• 1 property inherited from QObject

Public Functions

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

• 2 public functions inherited from Qt3DCore::QComponent
• 13 public functions inherited from Qt3DCore::QNode
• 31 public functions inherited from QObject

Public Slots

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

• 1 public slot inherited from Qt3DCore::QComponent
• 3 public slots inherited from Qt3DCore::QNode
• 1 public slot inherited from QObject

Signals

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

• 3 signals inherited from Qt3DCore::QComponent
• 4 signals inherited from Qt3DCore::QNode
• 2 signals inherited from QObject

Static Public Members

const QMetaObject

staticMetaObject

• 9 static public members inherited from QObject

Additional Inherited Members

• 2 protected functions inherited from Qt3DCore::QNode
• 9 protected functions inherited from QObject

Detailed Description

Constructs a new QAxisAccumulator instance with 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.

Member Type Documentation

enum QAxisAccumulator::SourceAxisType

Constant	Value
Qt3DInput::QAxisAccumulator::Velocity	0
Qt3DInput::QAxisAccumulator::Acceleration	1

Member Function Documentation

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

Constructs a new 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.

Note: Getter function for property scale.

See also setScale().

[slot] void QAxisAccumulator::setSourceAxis(Qt3DInput::QAxis *sourceAxis)

Sets the source axis from which the accumulator should receive values from to sourceAxis. How these values are treated is controlled by the sourceAxisType and scale properties.

Note: Setter function for property sourceAxis.

See also sourceAxis().

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

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

Note: Setter function for property sourceAxisType.

See also sourceAxisType().

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

Returns QAxis for which the accumulator should integrate axis values.

Note: Getter function for property sourceAxis.

See also setSourceAxis().

Qt3DInput::QAxisAccumulator::SourceAxisType QAxisAccumulator::sourceAxisType() const

Returns how the accumulator treats the value of the sourceAxis.

Note: Getter function for property sourceAxisType.

See also 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.

Note: Getter function for property velocity.