内容

• 特性
• 公共函数
• 详细描述
• QRotationReading Units

QRotationReading Class

The QRotationReading class represents one reading from the rotation sensor. 更多...

头：	#include <QRotationReading>
qmake:	QT += sensors
Since:	Qt 5.1
继承：	QSensorReading

• 所有成员列表，包括继承成员

特性

• x : const qreal
• y : const qreal
• z : const qreal

• 1 特性继承自 QSensorReading
• 1 特性继承自 QObject

公共函数

void	setFromEuler (qreal x , qreal y , qreal z )
qreal	x () const
qreal	y () const
qreal	z () const

• 4 公共函数继承自 QSensorReading
• 32 公共函数继承自 QObject

额外继承成员

• 1 公共槽继承自 QObject
• 2 信号继承自 QObject
• 11 静态公共成员继承自 QObject
• 9 保护函数继承自 QObject

详细描述

The QRotationReading class represents one reading from the rotation sensor.

QRotationReading Units

The rotation reading contains 3 angles, measured in degrees that define the orientation of the device in three-dimensional space. These angles are similar to yaw, pitch and roll but are defined using only right hand rotation with axes as defined by the right hand cartesian coordinate system.

The three angles are applied to the device in the following order.

• Right-handed rotation z (-180, 180]. Starting from the y-axis and incrementing in the counter-clockwise direction.
• Right-handed rotation x [-90, 90]. Starting from the new (once-rotated) y-axis and incrementing towards the z-axis.
• Right-handed rotation y (-180, 180]. Starting from the new (twice-rotated) z-axis and incrementing towards the x-axis.

Here is a visualization showing the order in which angles are applied.

The 0 point for the z angle is defined as a fixed, external entity and is device-specific. While magnetic North is typically used as this reference point it may not be. Do not attempt to compare values for the z angle between devices or even on the same device if it has moved a significant distance.

If the device cannot detect a fixed, external entity the z angle will always be 0 and the QRotationSensor::hasZ property will be set to false.

The 0 point for the x and y angles are defined as when the x and y axes of the device are oriented towards the horizon. Here is an example of how the x value will change with device movement.

Here is an example of how the y value will change with device movement.

Note that when x is 90 or -90, values for z and y achieve rotation around the same axis (due to the order of operations). In this case the y rotation will be 0.

特性文档编制

x : const qreal

This property holds the rotation around the x axis.

Measured as degrees.

访问函数：

qreal

x () const

另请参阅 QRotationReading Units .

y : const qreal

This property holds the rotation around the y axis.

Measured as degrees.

访问函数：

qreal

y () const

另请参阅 QRotationReading Units .

z : const qreal

This property holds the rotation around the z axis.

Measured as degrees.

访问函数：

qreal

z () const

另请参阅 QRotationReading Units .

成员函数文档编制

void QRotationReading:: setFromEuler ( qreal x , qreal y , qreal z )

Sets the rotation from three euler angles.

This is to be called from the backend.

The angles are measured in degrees. The order of the rotations matters, as first the z rotation is applied, then the x rotation and finally the y rotation.

该函数在 Qt 5.0 引入。