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 |
该类在 Qt 5.8 引入。
| enum | SourceAxisType { Velocity, Acceleration } |
| QAxisAccumulator (Qt3DCore::QNode * parent = nullptr) | |
| float | scale () const |
| Qt3DInput::QAxis * | sourceAxis () const |
| Qt3DInput::QAxisAccumulator::SourceAxisType | sourceAxisType () const |
| float | value () const |
| float | velocity () const |
| void | setScale (float scale ) |
| void | setSourceAxis (Qt3DInput::QAxis * sourceAxis ) |
| void | setSourceAxisType (QAxisAccumulator::SourceAxisType sourceAxisType ) |
| void | scaleChanged (float scale ) |
| void | sourceAxisChanged (Qt3DInput::QAxis * sourceAxis ) |
| void | sourceAxisTypeChanged (QAxisAccumulator::SourceAxisType sourceAxisType ) |
| void | valueChanged (float value ) |
| void | velocityChanged (float value ) |
Constructs a new QAxisAccumulator instance with parent .
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.
| 常量 | 值 |
|---|---|
Qt3DInput::QAxisAccumulator::Velocity
|
0
|
Qt3DInput::QAxisAccumulator::Acceleration
|
1
|
Returns the accumulated (integrated) value.
访问函数：
| float | 值 () const |
通知程序信号：
| void | valueChanged (float value ) |
Constructs a new QAxisAccumulator instance with parent parent .
[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.
注意： Setter 函数对于特性 sourceAxis .
另请参阅 sourceAxis ().
[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 ().
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 function for property scale.
另请参阅 setScale ().
返回 QAxis for which the accumulator should integrate axis values.
注意： Getter function for property sourceAxis.
另请参阅 setSourceAxis ().
Returns how the accumulator treats the value of the sourceAxis .
注意： Getter function for property sourceAxisType.
另请参阅 setSourceAxisType ().
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 function for property velocity.