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QReverseGeocode component for quick reverse geocoding in QML

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import QtQuick 1.1
 
import QtQuick 1.1
 
import com.nokia.symbian 1.1
 
import com.nokia.symbian 1.1
import QJson 1.0
 
 
import QtWebKit 1.0
 
import QtWebKit 1.0
 
import QtMobility.location 1.2
 
import QtMobility.location 1.2

Revision as of 16:21, 4 June 2012

Article Metadata
Code Example
Source file: QReverseGeocode Nokia Project
Tested with
Devices(s): Nokia N8, Nokia C7-00
Platform Security
Capabilities: NetworkServices
Article
Keywords: Reverse Geocode
Created: galazzo (04 Jun 2012)
Last edited: galazzo (04 Jun 2012)

Contents

Introduction

Reverse geocoding is the process of back (reverse) coding of a point location (latitude, longitude) to a readable address or place name. This permits the identification of nearby street addresses, places, and/or areal subdivisions such as neighbourhoods, county, state, or country. Combined with geocoding and routing services, reverse geocoding is a critical component of mobile location-based services.
Nokia provides one of the best location based services available and reverse geocoding is well supported in Qt/C++ and HTML5, but is not so fast to access to this service from QML.
QReverseGeocode provide a quick and easy solution to manage reverse geocoding from QML.

Installation

  1. Download source code from here
  2. Include QReverseGeocode directory into your project

.pro

include(./qreversegeocode/reversegeocode.pri)

main.cpp

#include <QtGui/QApplication>
#include "qmlapplicationviewer.h"
 
#include <QtDeclarative>
#include "qreversegeocode.h"
 
Q_DECL_EXPORT int main(int argc, char *argv[])
{
QScopedPointer<QApplication> app(createApplication(argc, argv));
 
qmlRegisterType<QReverseGeocode>("QReverseGeocode", 1, 0, "QReverseGeocode");
 
QmlApplicationViewer viewer;
viewer.setMainQmlFile(QLatin1String("qml/QReverseGeocodeSample/main.qml"));
viewer.showExpanded();
 
return app->exec();
}

QML

import QtQuick 1.1
import com.nokia.symbian 1.1
import QtWebKit 1.0
import QtMobility.location 1.2
import QReverseGeocode 1.0
 
Page {
id: mainPage
 
Text {
id: place
text: ""
}
 
PositionSource {
id: positionSource
active: true
 
onPositionChanged: {
reverseGeocoder.latitude = positionSource.position.coordinate.latitude
reverseGeocoder.longitude = positionSource.position.coordinate.longitude
reverseGeocoder.start();
}
}
 
QReverseGeocode {
id:reverseGeocoder
onReverseGeocodeFinished:{
place.text=reverseGeocoder.postCode+" "+reverseGeocoder.city
}
}
 
}
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