QMapControl

[csvivek]

Hi,

I need to display raster maps in my application, i am using Qt 4.2.2.
can i directly use the API's provided in this site mentioned above.
Can you suggest how to use the APIs to display any raster map on a normal Qt widget?

Looking forward to your response

[rage]

I've replied to your mail.

[Tavo92]

Its a very interesting proyect! It is like the Google Maps Lib but for applications!
Rage, does the programm tells shortes-path from point to point, or do some kind of path-finding? It could be an excellent idea also (More difficult) if the programm can search for different sort of transports so you can see wether if you can go via bus to some point.

[rage]

Hmm, that could be possible, if somebody implements it... The widget is a good base to develop such an application. To calculate routes for instance, webservices from openstreetmap can be used. Their API provides to get "geometry information" and therewith a possibility to calculate routes....
The widget as is just displays map tiles and additional things like lines, points, images, other widgets...

[Cedric-2009]

Hi,
I would need to use such a nice widget with raster or vector files in an offline application. Is it possible ? Any help is welcome.

Thx,
Cedric.

[rage]

Currently it is only possible to display pre-rendered map tiles from map providers like OpenStreetMap. QMapControl allows to cache tiles persistently but this might not be the best solution for you.
It should be possible to display vector graphics whose underlying data could be stored local. But I have not planned to implement this feature. Maybe someone else is willing to do this.

[answerboy]

这个东西太好了！！！

[migel1976]

Hello. Vey intersting project, i'm really want to use it in my application, but i want to know is it possible to use Map tiles which stored lacaly, i'm only intersting OpenStreetMap.
If possible how to do it?

[rage]

Hi Migel,

you can use the function enablePersistentCache to store map tiles locally. But there is currently no script to initialize the cache with a map region automatically. So you have to browse manually through the area which you want to be cached.

[migel1976]

Thank you for answer, is it i'm right to understand i can download osm file area which i want to use (for example Moscow Region, Russia) from openstreetmap and after that load it use enablePersistentCache?
Or first time i conecting with server and after that i'll cache region which are intersting for me, and in next start application i can load it from cache

//! Enable persistent caching of map tiles
/*!
* Call this method to allow the QMapControl widget to save map tiles
* persistent (also over application restarts).
* Tiles are stored in the subdirectory "QMapControl.cache" within the
* user's home directory. This can be changed by giving a path.
* @param path the path to the cache directory
*/
void enablePersistentCache ( const QDir& path=QDir::homePath() + "/QMapControl.cache" );

[rage]

Correct

[Thomas_Lerman]

I would love to see something like this that works in a QGraphicsScene.