Accelerometer Sensor Example Using QtMobility Project
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| − | {{Abstract|This code snippet shows how to use | + | {{Abstract|This code snippet shows how to use the [http://doc.qt.nokia.com/qtmobility-1.1.0/index.html Qt Mobilty] [http://doc.qt.nokia.com/qtmobility-1.1.0/qaccelerometer.html QAccelerometer] and [http://doc.qt.nokia.com/qtmobility-1.1.0/sensors-api.html Sensor API]s to get and display sensor data.}} |
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==Preconditions== | ==Preconditions== | ||
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==Source== | ==Source== | ||
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#include "accelerometer.h" | #include "accelerometer.h" | ||
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==Related Articles== | ==Related Articles== | ||
| − | [[QtMagnetometer Sensor Example Using QtMobility Project]] | + | * [[QtMagnetometer Sensor Example Using QtMobility Project]] |
| − | + | * [[Turning phone into magnetic compass using Qt mobility project]] | |
| − | [[Turning phone into magnetic compass using Qt mobility project]] | + | * [[Compass Sensor Example Using QtMobility Project]][[Category:MeeGo Harmattan]] [[Category:Symbian]] |
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| − | [[Compass Sensor Example Using QtMobility Project]] | + | |
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Latest revision as of 04:23, 11 October 2012
This code snippet shows how to use the Qt Mobilty QAccelerometer and Sensor APIs to get and display sensor data.
Article Metadata
Code Example
Source file: Media: QtAccelerometer_QtMobility.zip
Tested with
Devices(s): N8,C7,E7
Compatibility
Platform(s): Symbian
Article
Keywords: QAccelerometer,Qt Mobility ,Sensor API
Created: chintandave_er
(18 Nov 2010)
Last edited: hamishwillee
(11 Oct 2012)
Contents |
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 = QtAccelerometer
TEMPLATE = app
SOURCES += main.cpp\
accelerometer.cpp
HEADERS += accelerometer.h
CONFIG += mobility
CONFIG += debug
MOBILITY = sensors
symbian {
TARGET.UID3 = 0xe239264e
# TARGET.CAPABILITY +=
TARGET.EPOCSTACKSIZE = 0x14000
TARGET.EPOCHEAPSIZE = 0x020000 0x800000
}
Header
Here is the accelerometer.h header file.
#include <QtGui/QMainWindow>
#include <QGraphicsView>
#include <QBasicTimer>
#include <QTimer>
#include <QAccelerometer> // Add Sensor Class
// add Qt Mobility Project Namespace
QTM_USE_NAMESPACE
class QGraphicsRectItem;
class QGraphicsSimpleTextItem;
class Accelerometer : public QGraphicsView
{
Q_OBJECT
public:
Accelerometer(QWidget *parent = 0);
protected:
bool event(QEvent *event);
private:
void updateXYZPosition();
private:
QGraphicsRectItem *Rect;
QGraphicsSimpleTextItem *text;
QAccelerometer *accelerometerSensor;
QBasicTimer Timer;
QTimer inactiveTimer;
};
Source
#include "accelerometer.h"
#include <QGraphicsRectItem>
#include <QGraphicsSimpleTextItem>
#include <QResizeEvent>
#include <QTimerEvent> // timer event
#include <QDebug>
Accelerometer::Accelerometer(QWidget *parent) : QGraphicsView(parent), Rect(0), text(0), accelerometerSensor(0)
{
QGraphicsScene *scene = new QGraphicsScene(this);
setScene(scene);
Rect = new QGraphicsRectItem();
text = new QGraphicsSimpleTextItem(Rect);
text->setBrush(Qt::gray);
scene->addItem(Rect);
accelerometerSensor = new QAccelerometer(this);
inactiveTimer.setSingleShot(true);
if (!Timer.isActive())
Timer.start(20, this);
// start the sensor
if (!accelerometerSensor->isActive())
accelerometerSensor->start();
if (!accelerometerSensor->isActive())
{
qDebug() << "accelerometer sensor didn't start!" << endl;
}
setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
}
bool Accelerometer::event(QEvent *event)
{
switch (event->type()) {
case QEvent::Timer:
if (static_cast<QTimerEvent*>(event)->timerId() == Timer.timerId())
updateXYZPosition(); // update the xyz position
break;
default:
break;
}
return QGraphicsView::event(event);
}
void Accelerometer::updateXYZPosition()
{
QAccelerometerReading *reading = accelerometerSensor->reading();
qreal xacceleration = 0.0f;
qreal yacceleration = 0.0f;
qreal zacceleration = 0.0f;
if (reading) {
xacceleration = reading->x();
yacceleration = reading->y();
zacceleration = reading->z();
// for debug purpose
qDebug() << "xacceleration x" << endl;
qDebug() << xacceleration << endl;
qDebug() << "yacceleration y" << endl;
qDebug() << yacceleration << endl;
qDebug() << "zacceleration z" << endl;
qDebug() << zacceleration << endl;
// set the text and display it on the screen
QLocale c(QLocale::C);
text->setText("x: " + c.toString(xacceleration) + " y: " + c.toString(yacceleration) + " z: " + c.toString(zacceleration));
}
}
Postconditions
Here is the QtAccelerometer Application's Screenshot. You can change the Accelerometer Sensor data from Qt Simulator.
Example Applications
Example application can be found on the following link File:QtAccelerometer QtMobility.zip.
