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/****************************************************************************
**
** Copyright (C) 2012 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the examples of the Qt Mobility Components.
**
** $QT_BEGIN_LICENSE:BSD$
** You may use this file under the terms of the BSD license as follows:
**
** "Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions are
** met:
** * Redistributions of source code must retain the above copyright
** notice, this list of conditions and the following disclaimer.
** * Redistributions in binary form must reproduce the above copyright
** notice, this list of conditions and the following disclaimer in
** the documentation and/or other materials provided with the
** distribution.
** * Neither the name of Nokia Corporation and its Subsidiary(-ies) nor
** the names of its contributors may be used to endorse or promote
** products derived from this software without specific prior written
** permission.
**
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include <QtCore>
#include <qaccelerometer.h>
QTM_USE_NAMESPACE
namespace check{
static void checkRate(QSensor* sensor, int rate){
qDebug()<<"data rate set for sensor "<<rate;
if (rate == sensor->dataRate()) return;
if (rate!=sensor->dataRate()){
qrangelist rates = sensor->availableDataRates();
QString datarates;
for( int i = 0; i < rates.size(); ++i )
{
datarates.append("[");
QString num;
datarates.append(num.setNum(rates[i].first));
datarates.append("..");
datarates.append(num.setNum(rates[i].second));
datarates.append("] ");
}
qDebug()<<"Rate setting failed, rate must be within range "<<datarates;
}
}
}
class AccelerometerFilter : public QAccelerometerFilter
{
public:
qtimestamp stamp;
qreal sum, varianceSum;
int i, dataRate;
AccelerometerFilter(int fq):sum(0),i(0),dataRate(fq), varianceSum(0){}
bool filter(QAccelerometerReading *reading)
{
int diff = ( reading->timestamp() - stamp );
stamp = reading->timestamp();
QTextStream out(stdout);
qreal fq = 1000000.0 / diff;
out << QString("Acceleration: %1 x").arg(reading->x(), 5, 'f', 1)
<< QString(" %1 y").arg(reading->y(), 5, 'f', 1)
<< QString(" %1 z m/s^2").arg(reading->z(), 5, 'f', 1)
<< QString(" (%1 ms since last, %2 Hz)").arg(diff / 1000, 4).arg( fq, 5, 'f', 1) << endl;
if (dataRate>0){
if (qAbs(dataRate-fq)<(fq/4)){
sum +=fq;
i++;
if (i>1){
qreal average = sum/i;
varianceSum += (fq-average)*(fq-average);
out<<" amount "<<i<< " average = "<<average<<" variance = "<<varianceSum/i<<endl;
}
}
}
return false; // don't store the reading in the sensor
}
};
int main(int argc, char **argv)
{
QCoreApplication app(argc, argv);
QStringList args = app.arguments();
int rate_place = args.indexOf("-r");
int rate_val = 0;
if (rate_place != -1)
rate_val = args.at(rate_place + 1).toInt();
QAccelerometer sensor;
sensor.connectToBackend();
sensor.setProperty("alwaysOn",true);
if (rate_val > 0) {
sensor.setDataRate(rate_val);
check::checkRate(&sensor, rate_val);
}
int buffer_place = args.indexOf("-b");
int bufferSize = buffer_place!=-1? args.at(buffer_place + 1).toInt():1;
sensor.setProperty("bufferSize",bufferSize);
sensor.setProperty("bufferInOneShot",args.indexOf("-bb")>-1);
AccelerometerFilter filter(rate_val);
sensor.addFilter(&filter);
sensor.start();
if (!sensor.isActive()) {
qWarning("Accelerometersensor didn't start!");
return 1;
}
return app.exec();
}
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