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     2 **

     3 ** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).

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     7 ** This file is part of the Qt Mobility Components.

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    39 ****************************************************************************/

    40 

    41 #include <QtCore>

    42 #include <qaccelerometer.h>

    43 

    44 QTM_USE_NAMESPACE

    45 

    46 namespace arrows{

    47     static const QString ARROW_UP="^", ARROW_DOWN="v", ARROW_LEFT="<",ARROW_RIGHT=">", ARROW_TO=".", ARROW_FROM="x";

    48 }

    49 

    50 class AccelerometerFilter : public QAccelerometerFilter

    51 {

    52 public:

    53 

    54     bool filter(QAccelerometerReading *reading)

    55     {

    56         QString arrow = getArrowKey(reading->x(), reading->y(), reading->z());

    57         if (arrow!=exArrow){

    58             qDebug() << "direction:" << arrow;

    59             exArrow = arrow;

    60         }

    61         return false; // don't store the reading in the sensor

    62     }

    63 

    64 private:

    65     QString exArrow;

    66     static const qreal THRESHOLD;

    67 

    68     QString getArrowKey(qreal x, qreal y, qreal z){

    69 

    70         // axis_z: TO or FROM

    71         if (abs(y)<THRESHOLD && abs(x)<THRESHOLD) return z>0?(arrows::ARROW_FROM):(arrows::ARROW_TO);

    72 

    73         // axis_x: LEFT or RIGHT

    74         if (abs(x)>abs(y)) return x>0?(arrows::ARROW_LEFT):(arrows::ARROW_RIGHT);

    75 

    76         // axis_y: UP or DOWN

    77         return y>0?(arrows::ARROW_DOWN):(arrows::ARROW_UP);

    78     }

    79 

    80     static qreal abs(qreal value) {return value<0?-value:value;}

    81 };

    82 

    83 const qreal AccelerometerFilter::THRESHOLD = 0.3;

    84 

    85 int main(int argc, char **argv)

    86 {

    87     QCoreApplication app(argc, argv);

    88     QAccelerometer sensor;

    89     if (!sensor.connectToBackend()) {

    90         qWarning("No Accelerometer available!");

    91         return 1;

    92     }

    93     AccelerometerFilter filter;

    94     sensor.addFilter(&filter);

    95     sensor.start();

    96 

    97     return app.exec();

    98 }