examples/Qt/sensorgesture/CoverGesture/coverrecognizer.h

/****************************************************************************
**
** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation
**
**
** $QT_BEGIN_LICENSE:BSD$
** 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."
** $QT_END_LICENSE$
**
****************************************************************************/

#ifndef COVERRECOGNIZER_H
#define COVERRECOGNIZER_H

// System includes
#include <XQSensorGestureRecognizer>
#include <QtGlobal>
#include <QAccelerometer>
#include <QProximitySensor>
#include <QElapsedTimer>

// Constants.coverGestureType describes what kind of gesture is recognized by this plugin.
const QString coverGestureType = QString("com.nokia.gesture.cover");
// Number of samples used for moving average filter.
const quint8 movingAverageSamples = 8;

// Namespace needed to use Qt Mobility APIs
// (defined in qmobilityglobal.h but implicitly included from any Qt Mobility header)
QTM_USE_NAMESPACE

class CoverRecognizer : public XQSensorGestureRecognizer
{       
    Q_OBJECT
    
public:   
    CoverRecognizer();    
    ~CoverRecognizer();    
    bool start();    
    void stop();
    
private slots:
    void filter_proximity();    
    void filter_accelerometer();

private:
    void emitSignal();
    
private: 
    QAccelerometer *mAccSensor; // For accelerometet data
    QProximitySensor *mProxSensor; // For proximity data
    QElapsedTimer *mElapsedTimer;  // To calculate how much time has elapsed 
                                   // after the phone is covered, lying flay and faceup  
    qreal mXValues[movingAverageSamples]; // For x cordinate data of accelerometer reading  
    qreal mYValues[movingAverageSamples]; // For y cordinate data of accelerometer reading
    qreal mZValues[movingAverageSamples]; // For z cordinate data of accelerometer reading
    uint mMovingAverageIndex; // moving average filter data index
    
};

#endif // COVERRECOGNIZER_H

---