#include <QtGui/QMainWindow>
#include <QGraphicsView>
#include <QBasicTimer>
#include <QTimer>
#include <QMagnetometer> // Add Sensor Class
 
// add Qt Mobility Project Namespace
QTM_USE_NAMESPACE
 
class QGraphicsRectItem;
class QGraphicsSimpleTextItem;
 
 
class Magnetometer : public QGraphicsView
{
    Q_OBJECT
 
public:
    Magnetometer(QWidget *parent = 0);
 
protected:
    bool event(QEvent *event);
 
private:
    void updateMagnetometerSensor();
 
private:
    QGraphicsRectItem *Rect;
    QGraphicsSimpleTextItem *text;
    QMagnetometer *MagnetometerSensor;
    QBasicTimer Timer;
    QTimer inactiveTimer;
};

#include "magnetometer.h"
#include <QGraphicsRectItem>
#include <QGraphicsSimpleTextItem>
#include <QResizeEvent>
 
// include timer event
#include <QTimerEvent>
#include <QDebug>
 
Magnetometer::Magnetometer(QWidget *parent) : QGraphicsView(parent), Rect(0), text(0), MagnetometerSensor(0)
{
    QGraphicsScene *scene = new QGraphicsScene(this);
    setScene(scene);
 
    Rect = new QGraphicsRectItem();
 
    text = new QGraphicsSimpleTextItem(Rect);
    text->setBrush(Qt::gray);
    scene->addItem(Rect);
 
    MagnetometerSensor = new QMagnetometer(this);
    inactiveTimer.setSingleShot(true);
 
    if (!Timer.isActive())
        Timer.start(20, this);
 
    // start the sensor
    if (!MagnetometerSensor->isActive())
        MagnetometerSensor->start();
 
    if (!MagnetometerSensor->isActive())
    {
        qDebug() << "Magnetometer sensor didn't start!" << endl;
    }
 
    setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
    setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
}
 
bool Magnetometer::event(QEvent *event)
{
    switch (event->type()) {
    case QEvent::Timer:
        if (static_cast<QTimerEvent*>(event)->timerId() == Timer.timerId())
            updateMagnetometerSensor(); // update the sensor data
        break;
    default:
        break;
    }
    return QGraphicsView::event(event);
}
 
void Magnetometer::updateMagnetometerSensor()
{
    QMagnetometerReading *reading = MagnetometerSensor->reading();
    qreal x = 0.0f;
    qreal y = 0.0f;
    qreal z = 0.0f;
    qreal calibrationLevel = 0.0f;
    if (reading) {
        x = reading->x();
        y = reading->y();
        z = reading->z();
        calibrationLevel = reading->calibrationLevel();
 
        // set the text and display it on the screen
        QLocale c(QLocale::C);
        text->setText("x: " + c.toString(x) + " y: " + c.toString(y) + " z: " + c.toString(z) + "\n\nMagnetometer Calibration Level: " + 
 
c.toString(calibrationLevel));
 
     }
}