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How to use QCompass sensor

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m (Text replace - "Category:MeeGo" to "Category:MeeGo Harmattan")
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m (Text replace - "<code cpp>" to "<code cpp-qt>")
 
Line 29: Line 29:
 
* Add the Qt Mobility project configuration option in the '''.Pro''' file as shown below
 
* Add the Qt Mobility project configuration option in the '''.Pro''' file as shown below
  
<code cpp>
+
<code cpp-qt>
 
CONFIG += mobility
 
CONFIG += mobility
 
MOBILITY += sensors
 
MOBILITY += sensors
Line 36: Line 36:
 
*here is the full project(.pro) file.
 
*here is the full project(.pro) file.
  
<code cpp>
+
<code cpp-qt>
  
 
QT      += core gui
 
QT      += core gui
Line 70: Line 70:
 
* Add the Qt Mobility namespace to use Qt Mobiltiy in header file
 
* Add the Qt Mobility namespace to use Qt Mobiltiy in header file
  
<code cpp>
+
<code cpp-qt>
 
QTM_USE_NAMESPACE
 
QTM_USE_NAMESPACE
 
</code>
 
</code>
Line 116: Line 116:
 
Here is the qtcompassensor.cpp source file.
 
Here is the qtcompassensor.cpp source file.
  
<code cpp>
+
<code cpp-qt>
  
 
#include "qtcompassensor.h"
 
#include "qtcompassensor.h"

Latest revision as of 01:13, 11 October 2012

This code snippet shows how to use Qt's QCompass sensor and display sensor data on the screen.

Article Metadata
Code ExampleTested with
Devices(s): N8,C7,E7
Compatibility
Platform(s): Symbian
Symbian
Article
Keywords: QCompass,Qt Mobility ,Sensor API
Created: chintandave_er (29 Nov 2010)
Last edited: hamishwillee (11 Oct 2012)

Contents

[edit] Project File (.pro file)

  • Add the Qt Mobility project configuration option in the .Pro file as shown below
CONFIG += mobility
MOBILITY += sensors
  • here is the full project(.pro) file.
QT       += core gui
 
TARGET = QtCompasSensor
TEMPLATE = app
 
 
SOURCES += main.cpp\
qtcompassensor.cpp
 
HEADERS += qtcompassensor.h
 
CONFIG += mobility
CONFIG += debug
MOBILITY = sensors
 
symbian {
TARGET.UID3 = 0xe00fb3c0
# TARGET.CAPABILITY +=
TARGET.EPOCSTACKSIZE = 0x14000
TARGET.EPOCHEAPSIZE = 0x020000 0x800000
}


[edit] Header

  • Add the Qt Mobility namespace to use Qt Mobiltiy in header file
QTM_USE_NAMESPACE

Here is the qtcompassensor.h header file.

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


[edit] Source

Here is the qtcompassensor.cpp source file.

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

[edit] Postconditions

Here is the QtCompassSensor Application's Screenshot. You can change the Compass Sensor data like azimuth and Calibration Level from Qt Simulator.

QtCompassSimulator.png QtCompassExample.png

[edit] Example Application

Example application can be found on the following link File:QtCompassSensorExample.zip.

[edit] Related Articles

This page was last modified on 11 October 2012, at 01:13.
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