Location data involves a precisely specified position on the Earth's surface — as provided by a latitude-longitude coordinate — along with associated data, such as:. For more information see Geographic Coordinate.
This data can be extracted through a variety of methods. One of the most well known methods of positioning is GPS Global Positioning Systema publicly available system that uses radiowave signals received from Earth-orbiting satellites to calculate the precise position and time of the receiver. Another popular method is 'Cell Identifier Positioning', which uses the cell identifier of the cell site that is currently serving the receiving device to calculate its approximate location.
The coordinate is a basic unit of geographical information. The coordinate type has attributes to hold the latitudelongitude and altitude. The three dimensional position of an object such as a mobile device can be specified by giving the latitude, longitude and altitude.
Additionally for computation of future positions we would like to know if the object is moving, what speed it is doing and what is the timestamp of the last position data. Position therefore includes values for the coordinatespeed and a timestamp. Position also takes responsibility for validation of sensible values for these properties.
We have a Position type, a coordinate type but where does the data come from? Also it is a good idea to be able to indicate alternative sources. Perhaps instead of directly picking up GPS satellites it might be desirable to do some testing using a datafile. The PositionSource type provides the developer with control, within the limits allowed by the platform, of the source of the geographical data.
NMEA is a common text-based protocol for specifying navigational data. To use a TCP socket set the "socket" uri scheme. The GeoFlickr Example uses the Location to download thumbnail images from Flickr relevant to the current location.
Documentation contributions included herein are the copyrights of their respective owners. Qt and respective logos are trademarks of The Qt Company Ltd. All other trademarks are property of their respective owners. Positioning QML Location Positioning Location data involves a precisely specified position on the Earth's surface — as provided by a latitude-longitude coordinate — along with associated data, such as: The date and time at which the position was reported The velocity of the device that reported the position The altitude of the reported position height above sea level The bearing of the device in degrees, relative to true north For more information see Geographic Coordinate.
Coordinates The coordinate is a basic unit of geographical information.
I am working on a logger framework for QT applications. I am not using QMessageLogger directly because of understanding and learning purposes. There is one thing about one QMessageLogger functionality that I would really like to have in my logger but I dont know how does it work.
Lets take for example the qDebug macro:. How can I achieve such effect? I would really appreciate all help, would be grateful for an example. Here is my print method body. I need to achieve simmilar functionality with the "stream" way:.
The above line constructs a QMessageLogger instance and immediately accesses its debug member. Since it is a macro, it's also important what you write in code right after it. If you look at what QMessageLogger::debug is, you'll see four overloads, and the first two of them are pertinent to your question:.
Now the matter should be simple. In the second case you're calling an overload that returns a QDebug object. The expanded macro is as follows:. Learn more. How does QMessageLogger magic work? Ask Question.Everything you need for your entire software development life cycle. Qt is the fastest and smartest way to produce industry-leading software that users love. The all-new Qt marketplace offers both free and paid extensions to expand the possibilities of your Qt development projects.
Qt World Summit returns with three days in the United States! Pencil yourself and your team in for May 12 - 14 and subscribe to the QtWS20 newsletter for news on the agenda, training, and special surprises.
One framework. One codebase. Any platform. Create beautiful interfaces Designing and prototyping with Qt. Code using powerful tools Coding and testing with Qt.
Set-top-box digital TV platform Read More. Automotive digital cockpit Read More. Smart manufacturing and industrial automation Read More. Digital automotive cockpit Read More.
Register today. Ultimate performance. Tiny footprint. Create smartphone-like user experiences on microcontrollers with Qt for MCUs. Grab the free evaluation package. All the Qt extensions you've ever dreamed of The all-new Qt marketplace offers both free and paid extensions to expand the possibilities of your Qt development projects.
J-Hilk Sorry I am new to programming and i dont have much idea to make use of that piece of code. Can you be more clear, and help me to get the position. Thank you. This is a simple code which i wrote, but the output is just "-nan" What more should i add to the code?
Subscribe to RSS
Qt Forum. Qt example application for GPS This topic has been deleted. Only users with topic management privileges can see it. Reply Quote 0 1 Reply Last reply. Reply Quote 3 1 Reply Last reply. I couldnt find any from those examples that's not true from the GeoFlicker example.
I am building on a 64bit Ubuntu Linux Any help is much appreciated! Package name might be qt5-defaults or something like that, they keep changing package name apparently. I tried both qt5-qmake and qt5-default and they both give the same error:.
I just installed libbluetooth-dev and will check to see if that will help enable bluetooth support. Do you think I need to build and install either gypsy or geoclue from source code instead of installing them from apt-get repository?
SGaist that worked for bluetooth! But not for gps. Here is the relevant section of output of. Can you think of any other packages I need for gps qtlocation support? I have installed everything that contains gypsy or geoclue in its name using synaptic package manager. I don't know how else to find out what I am missing. SGaist yes i did run it in a clean directory with the -v option.
Here is the test result:. Shouldn't the test look for gypsy-daemon and not gypsy? I do not see a package in the repositories with the name gypsy??
SGaist pkg-config gypsy gconf And any package related to gconf installed? There are several packages related to gconf. I have gconf-service and gconf2 installed, but gconf2-dev is not installed. Could that be it? I'll install all packages containing the word gconf and will try again.
Thanks for looking into this! SGaist that fixed it!! Thank you!!!Qt Mobility 1. The API is designed so that the core functionality it provided by a plugin. Qt Mobility will ship with a plugin that accesses Nokia services by default but there should be nothing to stop someone from writing plugins that work with other services provided that we designed the API correctly. What we have at the moment should give you some idea of what we're aiming at in terms of functionality offered and the API which provides access to it.
The current code can be viewed as a draft of the API which we'll be releasing. We have applied some of the API review feedback although there are still some changes which will still have to make, and there is some additional functionality we'd like to add to the API, so some of the classes and methods might be renamed between now and the release.
Since most providers of mapping, routing and geocoding information offer no guarantees that their data is interoperable with the data provided by other services, the plugins are used to group the functionality per service provider.
This doesn't mean that you can't mix and match your sources of data, although it's a hint from us that you may want to be really sure that the "matching" part is done with care. Plugin are loaded using the QGeoServiceProvider class, which give access to instances of the classes reponsible for each area of functionality in the API. For the communications with the routing and search services we borrowed quite a bit of API from the Qt Network module.
The class at the center of the mapping functionality is QGeoMapWidget. This will be renamed before the beta release since it's not a widget at all. The widget instance allows the user to set or get the coordinate at the center of the map. The MapsViewer example is available for those who'd like to see the code in action before diving in. The Nokia plugin provides basic mapping functionality, although the performance is undergoing a major overhaul and the map objects are not complete.
We are looking at ways in which we might be able to allow users to specify map overlays, and are working on a set of convenience classes to form a tiled mapping API in order to assist plugin implementers who are working with tile-based mapping services. We have some work to do before we're ready for vector based mapping services, but it's on our list.
The QGeoRoutingManager instance has a related set of functions which can be used to determine whether the service supports a particular feature or constraint. The QGeoRouteReply instance returned by calculateRoute will contain one or more QGeoRoute instances, depending on whether alternative routes were requested.
The routing information may contain a number of instructions to be issued at various locations along the route - these instructions are described by the QGeoNavigationInstruction class. We break the route up into a number of QGeoRouteSegment instances which correspond to the segments of the route which occur between two consecutive instructions. The ability to specify features to avoid will probably be enhanced in order to support more fine-grained preferences with regard to features.
The QGeoSearchReply class contains a list of QGeoPlace instances, each of which contains a coordinate, and address and an optional bounding box. We return both pieces of information as the address or coordinate that was used in the geocode function may be slightly different from the corresponding address or coordinate in the reply.
Subscribe to RSS
The optional bounds parameters is used to limit the results to those within a certain geographical area - usually the area corresponding to what a user has in their map viewport.
When converting from address to coordinate the bounds parameter is most useful when a partially filled out address object is used - a QGeoAddress with city set to "London" could represent London, Great Britain or London, Kentucky, USA.
The searchTypes parameter is used to specify whether searchString is to be used for geocoding in which case it will be treated as an addressfor landmarks searching in which case it will be used to search the services landmarks database or both.
The return type for this method is still a list of QGeoPlace objects. This can be used so that a single search can make use of the plugins landmark database and a users personal landmark database at the same time.Using its simple drag and drop interface, a GUI interface can be quickly built without having to write the code. Hence, Qt Designer does not have the facility to debug and build the application. Creation of a GUI interface using Qt Designer starts with choosing a top level window for the application.
You can then drag and drop required widgets from the widget box on the left pane. You can also assign value to properties of widget laid on the form. The designed form is saved as demo. This ui file contains XML representation of widgets and their properties in the design.
This design is translated into Python equivalent by using pyuic4 command line utility. This utility is a wrapper for uic module.
In the above command, -x switch adds a small amount of additional code to the generated XML so that it becomes a self-executable standalone application. The user can input data in input fields but clicking on Add button will not generate any action as it is not associated with any function. Reacting to user-generated response is called as event handling. Previous Page. Next Page. Previous Page Print Page.