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#include <QtCore>

#include <qaccelerometer.h>

QTM_USE_NAMESPACE

namespace arrows{

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

}

class AccelerometerFilter : public QAccelerometerFilter

{

public:

    bool filter(QAccelerometerReading *reading)

    {

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

        if (arrow!=exArrow){

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

            exArrow = arrow;

        }

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

    }

private:

    QString exArrow;

    static const qreal THRESHOLD;

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

        // axis_z: TO or FROM

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

        // axis_x: LEFT or RIGHT

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

        // axis_y: UP or DOWN

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

    }

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

};

const qreal AccelerometerFilter::THRESHOLD = 0.3;

int main(int argc, char **argv)

{

    QCoreApplication app(argc, argv);

    QAccelerometer sensor;

    if (!sensor.connectToBackend()) {

        qWarning("No Accelerometer available!");

        return 1;

    }

    AccelerometerFilter filter;

    sensor.addFilter(&filter);

    sensor.start();

    return app.exec();

}