Qt3DInput.QAxisAccumulator ¶

概要 ¶

详细描述 ¶

构造新 QAxisAccumulator 实例与 parent .

A 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 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 QFrameAction but those approached are not ideal as they add more work to the main thread and are inherently imperative. The QAxisAccumulator class allows for this common task to be performed on the Qt 3D backend and be specified in a declarative manner.

class PySide2.Qt3DInput.Qt3DInput. QAxisAccumulator ( [ parent=None ] ) ¶

param parent

QNode

构造新 QAxisAccumulator instance with parent parent .

PySide2.Qt3DInput.Qt3DInput.QAxisAccumulator. SourceAxisType ¶

常量	描述
Qt3DInput.QAxisAccumulator.Velocity
Qt3DInput.QAxisAccumulator.Acceleration

PySide2.Qt3DInput.Qt3DInput.QAxisAccumulator. scale ( ) ¶

返回类型

float

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.

另请参阅

setScale()

PySide2.Qt3DInput.Qt3DInput.QAxisAccumulator. scaleChanged ( scale ) ¶

参数

scale – float

PySide2.Qt3DInput.Qt3DInput.QAxisAccumulator. setScale ( scale ) ¶

参数

scale – float

另请参阅

scale()

PySide2.Qt3DInput.Qt3DInput.QAxisAccumulator. setSourceAxis ( sourceAxis ) ¶

参数

sourceAxis – QAxis

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.

另请参阅

sourceAxis()

PySide2.Qt3DInput.Qt3DInput.QAxisAccumulator. setSourceAxisType ( sourceAxisType ) ¶

参数

sourceAxisType – SourceAxisType

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

另请参阅

sourceAxisType()

PySide2.Qt3DInput.Qt3DInput.QAxisAccumulator. sourceAxis ( ) ¶

返回类型

QAxis

返回 QAxis for which the accumulator should integrate axis values.

另请参阅

setSourceAxis()

PySide2.Qt3DInput.Qt3DInput.QAxisAccumulator. sourceAxisChanged ( sourceAxis ) ¶

参数

sourceAxis – QAxis

PySide2.Qt3DInput.Qt3DInput.QAxisAccumulator. sourceAxisType ( ) ¶

返回类型

SourceAxisType

Returns how the accumulator treats the value of the sourceAxis .

另请参阅

setSourceAxisType()

PySide2.Qt3DInput.Qt3DInput.QAxisAccumulator. sourceAxisTypeChanged ( sourceAxisType ) ¶

参数

sourceAxisType – SourceAxisType

PySide2.Qt3DInput.Qt3DInput.QAxisAccumulator. value ( ) ¶

返回类型

float

PySide2.Qt3DInput.Qt3DInput.QAxisAccumulator. valueChanged ( value ) ¶

参数

value – float

PySide2.Qt3DInput.Qt3DInput.QAxisAccumulator. velocity ( ) ¶

返回类型

float

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.

PySide2.Qt3DInput.Qt3DInput.QAxisAccumulator. velocityChanged ( value ) ¶

参数

value – float