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/****************************************************************************
**
** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/
**
** This file is part of the QtSensors module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** GNU Lesser General Public License Usage
** This file may be used under the terms of the GNU Lesser General Public
** License version 2.1 as published by the Free Software Foundation and
** appearing in the file LICENSE.LGPL included in the packaging of this
** file. Please review the following information to ensure the GNU Lesser
** General Public License version 2.1 requirements will be met:
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU General
** Public License version 3.0 as published by the Free Software Foundation
** and appearing in the file LICENSE.GPL included in the packaging of this
** file. Please review the following information to ensure the GNU General
** Public License version 3.0 requirements will be met:
** http://www.gnu.org/copyleft/gpl.html.
**
** Other Usage
** Alternatively, this file may be used in accordance with the terms and
** conditions contained in a signed written agreement between you and Nokia.
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qrotationsensor.h"
#include "qrotationsensor_p.h"
QT_BEGIN_NAMESPACE
IMPLEMENT_READING(QRotationReading)
/*!
\class QRotationReading
\ingroup sensors_reading
\inmodule QtSensors
\brief The QRotationReading class represents one reading from the
rotation sensor.
\section2 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.
\image sensors-rotation.jpg
The three angles are applied to the device in the following order.
\list
\o Right-handed rotation z (-180, 180]. Starting from the y-axis and
incrementing in the counter-clockwise direction.
\o Right-handed rotation x [-90, 90]. Starting from the new
(once-rotated) y-axis and incrementing towards the z-axis.
\o Right-handed rotation y (-180, 180]. Starting from the new
(twice-rotated) z-axis and incrementing towards the x-axis.
\endlist
Here is a visualization showing the order in which angles are applied.
\image sensors-rotation-anim.gif
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.
\image sensors-rotation2.jpg
Here is an example of how the y value will change with device movement.
\image sensors-rotation3.jpg
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.
*/
/*!
\property QRotationReading::x
\brief the rotation around the x axis.
Measured as degrees.
\sa {QRotationReading Units}
*/
qreal QRotationReading::x() const
{
return d->x;
}
/*!
Sets the rotation around the x axis to \a x.
*/
void QRotationReading::setX(qreal x)
{
d->x = x;
}
/*!
\property QRotationReading::y
\brief the rotation around the y axis.
Measured as degrees.
\sa {QRotationReading Units}
*/
qreal QRotationReading::y() const
{
return d->y;
}
/*!
Sets the rotation around the y axis to \a y.
*/
void QRotationReading::setY(qreal y)
{
d->y = y;
}
/*!
\property QRotationReading::z
\brief the rotation around the z axis.
Measured as degrees.
\sa {QRotationReading Units}
*/
qreal QRotationReading::z() const
{
return d->z;
}
/*!
Sets the rotation around the z axis to \a z.
*/
void QRotationReading::setZ(qreal z)
{
d->z = z;
}
// =====================================================================
/*!
\class QRotationFilter
\ingroup sensors_filter
\inmodule QtSensors
\brief The QRotationFilter class is a convenience wrapper around QSensorFilter.
The only difference is that the filter() method features a pointer to QRotationReading
instead of QSensorReading.
*/
/*!
\fn QRotationFilter::filter(QRotationReading *reading)
Called when \a reading changes. Returns false to prevent the reading from propagating.
\sa QSensorFilter::filter()
*/
char const * const QRotationSensor::type("QRotationSensor");
/*!
\class QRotationSensor
\ingroup sensors_type
\inmodule QtSensors
\brief The QRotationSensor class is a convenience wrapper around QSensor.
The only behavioural difference is that this class sets the type properly.
This class also features a reading() function that returns a QRotationReading instead of a QSensorReading.
For details about how the sensor works, see \l QRotationReading.
\sa QRotationReading
*/
/*!
\fn QRotationSensor::QRotationSensor(QObject *parent)
Construct the sensor as a child of \a parent.
*/
/*!
\fn QRotationSensor::~QRotationSensor()
Destroy the sensor. Stops the sensor if it has not already been stopped.
*/
/*!
\fn QRotationSensor::reading() const
Returns the reading class for this sensor.
\sa QSensor::reading()
*/
/*!
\property QRotationSensor::hasZ
\brief a value indicating if the z angle is available.
Returns true if z is available.
Returns false if z is not available.
*/
#include "moc_qrotationsensor.cpp"
QT_END_NAMESPACE
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