How to use QCompass sensor
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== Overview == | == Overview == | ||
| − | This code snippet shows how to use [http://doc.qt.nokia.com/qtmobility-1.1.0/qcompass.html QCompass] Sensor using [http:// | + | This code snippet shows how to use [http://doc.qt.nokia.com/qtmobility-1.1.0/qcompass.html QCompass] Sensor using [http://developer.qt.nokia.com/wiki/Category:Qt_Labs_Projects Qt Mobility Project] and display sensor data on the screen. This Example use [http://doc.qt.nokia.com/qtmobility-1.1.0/sensors-api.html Sensor API] of [http://doc.qt.nokia.com/qtmobility-1.1.0/index.html Qt Mobilty]. |
==Preconditions== | ==Preconditions== | ||
Revision as of 14:30, 26 May 2011
Contents |
Overview
This code snippet shows how to use QCompass Sensor using Qt Mobility Project and display sensor data on the screen. This Example use Sensor API of Qt Mobilty.
Preconditions
Read this for how to CS001615 - Setting up Qt Mobility
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
}
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;
};
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));
}
}
Postconditions
Here is the QtCompassSensor Application's Screenshot. You can change the Compass Sensor data like azimuth and Calibration Level from Qt Simulator.
Example Application
Example application can be found on the following link File:QtCompassSensorExample.zip.
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- chintandave_er 05:33, 9 December 2010 (UTC)
