qtmobility/src/sensors/qmagnetometer.cpp
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Mon, 03 May 2010 13:18:40 +0300
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permissions -rw-r--r--
Revision: 201015 Kit: 201018
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/****************************************************************************
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**
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** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
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** All rights reserved.
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** Contact: Nokia Corporation (qt-info@nokia.com)
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**
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** This file is part of the Qt Mobility Components.
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**
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** $QT_BEGIN_LICENSE:LGPL$
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** No Commercial Usage
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** This file contains pre-release code and may not be distributed.
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** You may use this file in accordance with the terms and conditions
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** contained in the Technology Preview License Agreement accompanying
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** this package.
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**
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** GNU Lesser General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU Lesser
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** General Public License version 2.1 as published by the Free Software
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** Foundation and appearing in the file LICENSE.LGPL included in the
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** packaging of this file.  Please review the following information to
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** ensure the GNU Lesser General Public License version 2.1 requirements
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** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
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**
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** In addition, as a special exception, Nokia gives you certain additional
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** rights.  These rights are described in the Nokia Qt LGPL Exception
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
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**
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** If you have questions regarding the use of this file, please contact
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** Nokia at qt-info@nokia.com.
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**
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**
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**
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**
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**
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**
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**
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#include "qmagnetometer.h"
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#include "qmagnetometer_p.h"
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QTM_BEGIN_NAMESPACE
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IMPLEMENT_READING(QMagnetometerReading)
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/*!
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    \class QMagnetometerReading
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    \ingroup sensors_reading
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    \preliminary
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    \brief The QMagnetometerReading class represents one reading from the
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           magnetometer.
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    \section2 QMagnetometerReading Units
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    The magnetometer returns magnetic flux density values along 3 axes.
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    The scale of the values is teslas. The axes are arranged as follows.
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\code
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             +z
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              |
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              |      +y
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              |     /
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              |----/----
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             /| NOKIA  /|
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            //|--/--- / |
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           // | /   //  /
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          //  |/   //  /
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         //   '--------------- +x
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        //       //  /
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       //       //  /
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      /---------/  /
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     /    O    /  /
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    /         /  /
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    ----------  /
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    |_________!/
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\endcode
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4
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    The magnetometer can report on either raw magnetic flux values or geomagnetic flux values.
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    By default it returns raw magnetic flux values. The QMagnetometer::returnGeoValues property
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    must be set to return geomagnetic flux values.
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4
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    The primary difference between raw and geomagnetic values is that extra processing
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    is done to eliminate local magnetic interference from the geomagnetic values so they
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    represent only the effect of the Earth's magnetic field. This process is not perfect
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    and the accuracy of each reading may change.
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    The accuracy of each reading is measured as a number from 0 to 1.
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    A value of 1 is the highest level that the device can support and 0 is
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    the worst.
1
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*/
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/*!
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    \property QMagnetometerReading::x
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    \brief the raw magnetic flux density on the X axis.
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    Measured as telsas.
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    \sa {QMagnetometerReading Units}
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*/
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qreal QMagnetometerReading::x() const
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{
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    return d->x;
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}
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/*!
4
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    Sets the raw magnetic flux density on the X axis to \a x.
1
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*/
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void QMagnetometerReading::setX(qreal x)
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{
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    d->x = x;
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}
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/*!
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    \property QMagnetometerReading::y
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    \brief the raw magnetic flux density on the Y axis.
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    Measured as telsas.
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    \sa {QMagnetometerReading Units}
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*/
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qreal QMagnetometerReading::y() const
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{
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    return d->y;
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}
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/*!
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    Sets the raw magnetic flux density on the Y axis to \a y.
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*/
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void QMagnetometerReading::setY(qreal y)
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{
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    d->y = y;
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}
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/*!
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    \property QMagnetometerReading::z
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    \brief the raw magnetic flux density on the Z axis.
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    Measured as telsas.
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    \sa {QMagnetometerReading Units}
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*/
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qreal QMagnetometerReading::z() const
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{
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    return d->z;
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}
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/*!
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    Sets the raw magnetic flux density on the Z axis to \a z.
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*/
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void QMagnetometerReading::setZ(qreal z)
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{
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    d->z = z;
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}
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/*!
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    \property QMagnetometerReading::calibrationLevel
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    \brief the accuracy of the reading.
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    Measured as a value from 0 to 1 with higher values being better.
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    Note that this only changes when measuring geomagnetic flux density.
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    Raw magnetic flux readings will always have a value of 1.
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    \sa {QMagnetometerReading Units}
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*/
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qreal QMagnetometerReading::calibrationLevel() const
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{
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    return d->calibrationLevel;
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}
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/*!
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    Sets the accuracy of the reading to \a calibrationLevel.
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*/
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void QMagnetometerReading::setCalibrationLevel(qreal calibrationLevel)
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{
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    d->calibrationLevel = calibrationLevel;
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}
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// =====================================================================
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/*!
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    \class QMagnetometerFilter
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    \ingroup sensors_filter
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    \preliminary
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    \brief The QMagnetometerFilter class is a convenience wrapper around QSensorFilter.
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    The only difference is that the filter() method features a pointer to QMagnetometerReading
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    instead of QSensorReading.
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*/
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/*!
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    \fn QMagnetometerFilter::filter(QMagnetometerReading *reading)
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    Called when \a reading changes. Returns false to prevent the reading from propagating.
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    \sa QSensorFilter::filter()
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*/
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const char *QMagnetometer::type("QMagnetometer");
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/*!
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    \class QMagnetometer
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    \ingroup sensors_type
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    \preliminary
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    \brief The QMagnetometer class is a convenience wrapper around QSensor.
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    The only behavioural difference is that this class sets the type properly.
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    This class also features a reading() function that returns a QMagnetometerReading instead of a QSensorReading.
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    For details about how the sensor works, see \l QMagnetometerReading.
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    \sa QMagnetometerReading
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*/
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/*!
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    \fn QMagnetometer::QMagnetometer(QObject *parent)
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    Construct the sensor as a child of \a parent.
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*/
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/*!
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    \fn QMagnetometer::~QMagnetometer()
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    Destroy the sensor. Stops the sensor if it has not already been stopped.
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*/
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/*!
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    \fn QMagnetometer::reading() const
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    Returns the reading class for this sensor.
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    \sa QSensor::reading()
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*/
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/*!
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    \property QMagnetometer::returnGeoValues
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    \brief a value indicating if geomagnetic values should be returned.
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    Set to true to return geomagnetic flux density.
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    Set to false (the default) to return raw magnetic flux density.
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    Note that you must access this property via QObject::property() and QObject::setProperty().
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    The property must be set before calling start().
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*/
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#include "moc_qmagnetometer.cpp"
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QTM_END_NAMESPACE
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