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Code Examples Sensors API: Difference between revisions

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= Overview =
= Overview =


This page points to and provides quick overviews of existing code examples using the "Sensors API":http://doc.qt.nokia.com/qtmobility-1.1.0/sensors-api.html, one of the suite of Qt Mobilty APIs.
This page points to and provides quick overviews of existing code examples using the [http://doc.qt.nokia.com/qtmobility-1.1.0/sensors-api.html Sensors API], one of the suite of Qt Mobilty APIs.


== Fall detector ==
== Fall detector ==


The "Fall Detector example":http://wiki.forum.nokia.com/index.php/Qt_Mobility_example_application:_Fall_Detector from Forum Nokia uses the accelerometer in a mobile device to detect if the user has fallen, then uses the
The [http://wiki.forum.nokia.com/index.php/Qt_Mobility_example_application:_Fall_Detector Fall Detector example] from Forum Nokia uses the accelerometer in a mobile device to detect if the user has fallen, then uses the


* "Location API":http://doc.qt.nokia.com/qtmobility-1.1.0/location-overview.html to get the user's location
* [http://doc.qt.nokia.com/qtmobility-1.1.0/location-overview.html Location API] to get the user's location


* the "Contacts API":http://doc.qt.nokia.com/qtmobility-1.1.0/contacts.html to store and access an email address to be notified in the event of a fall
* the [http://doc.qt.nokia.com/qtmobility-1.1.0/contacts.html Contacts API] to store and access an email address to be notified in the event of a fall


* and the "Messaging API ":http://doc.qt.nokia.com/qtmobility-1.1.0/messaging.html to send an email notification with photo attachment.
* and the [http://doc.qt.nokia.com/qtmobility-1.1.0/messaging.html Messaging API ] to send an email notification with photo attachment.


[[Image:http://www.forum.nokia.com/piazza/wiki/images/1/15/Falldetector--screens.png?20100324100739|Fall Dector Screen Shot]]
[[Image:http://www.forum.nokia.com/piazza/wiki/images/1/15/Falldetector--screens.png?20100324100739|Fall Dector Screen Shot]]
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== Use accelerometer to control an Open GL-ES 3D model ==
== Use accelerometer to control an Open GL-ES 3D model ==


This sensors tutorial from "Mobile Qt-Entwicklung":http://www.mobileqt.de/wiki/daten_des_accelerometer_sensors_mit_einem_opengl_objekt_verknuepfen (Mobile Qt Development) shows the accelerometer in an N900 manipulating a 3D model created using Open GL. The "descriptive text is in German":http://www.mobileqt.de/wiki/daten_des_accelerometer_sensors_mit_einem_opengl_objekt_verknuepfen, but all "the code is available in a downloadable package":http://www.mobileqt.de/tutorials/6/glsensordemo-0.1.zip and this "demo video":http://www.youtube.com/watch?v=uJpw0yeHJl8 shows you how it works.
This sensors tutorial from [http://www.mobileqt.de/wiki/daten_des_accelerometer_sensors_mit_einem_opengl_objekt_verknuepfen Mobile Qt-Entwicklung] (Mobile Qt Development) shows the accelerometer in an N900 manipulating a 3D model created using Open GL. The [http://www.mobileqt.de/wiki/daten_des_accelerometer_sensors_mit_einem_opengl_objekt_verknuepfen descriptive text is in German], but all [http://www.mobileqt.de/tutorials/6/glsensordemo-0.1.zip the code is available in a downloadable package] and this [http://www.youtube.com/watch?v=uJpw0yeHJl8 demo video] shows you how it works.


Here is the relevant accelerometer code:
Here is the relevant accelerometer code:

Revision as of 08:15, 4 March 2015

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[toc align_right="yes" depth="2"]

Overview

This page points to and provides quick overviews of existing code examples using the Sensors API, one of the suite of Qt Mobilty APIs.

Fall detector

The Fall Detector example from Forum Nokia uses the accelerometer in a mobile device to detect if the user has fallen, then uses the

  • the Contacts API to store and access an email address to be notified in the event of a fall
  • and the Messaging API to send an email notification with photo attachment.

Fall Dector Screen Shot Here's the code snippet for the fall detector using the Sensors API:

#include <QAccelerometer>

// Neccessary for Qt Mobility API usage
QTM_USE_NAMESPACE

class AccelerationInfo : public QObject, public QAccelerometerFilter
{
 Q_OBJECT

public:

AccelerationInfo(QObject* parent = 0) : QObject(parent)
 {
 m_sensor = new QAccelerometer(this);
 m_sensor->addFilter(this);
 m_sensor->start();
 }

private slots:

// Override of QAcclerometerFilter::filter(QAccelerometerReading*)
 void filter(QAccelerometerReading* reading)
 {
 qreal x = reading->x();
 qreal y = reading->y();
 qreal z = reading->z();

// Process acceleration sensor readings …

qDebug("Current device acceleration: x=%f y=%f z=%f", x, y, z);
 }

private:

QAccelerometer* m_sensor;
};

Use accelerometer to control an Open GL-ES 3D model

This sensors tutorial from Mobile Qt-Entwicklung (Mobile Qt Development) shows the accelerometer in an N900 manipulating a 3D model created using Open GL. The descriptive text is in German, but all the code is available in a downloadable package and this demo video shows you how it works.

Here is the relevant accelerometer code:

GLWidget::GLWidget(QWidget *parent) :

QGLWidget(parent)

{

setWindowTitle(tr("Sensor-GL-Demo"));
makeCurrent();

setAttribute(Qt::WA_PaintOnScreen);

setAttribute(Qt::WA_NoSystemBackground);
setAutoBufferSwap(false);

xRot = 0;

yRot = 0;
zRot = 0;

_rotationSensorAvailable = false;

_rotationSensor = new QtMobility::QAccelerometer(this);
_rotationSensor->connect();
if (!_rotationSensor->isAvailable()) {
qWarning("No acceleration sensor available!");
} else {
_rotationSensorAvailable = true;
_rotationSensor->setSignalEnabled(false); // we get the values from the sensor itself
_rotationSensor->setUpdateInterval(100); // as quickly as possible
_rotationSensor->start();
}

QTimer *timer = new QTimer(this);

timer->setInterval(10);
QObject::connect(timer, SIGNAL (timeout()), this, SLOT (updateGL()));
timer->start();
showFullScreen();

}