JMapViewer adding tiles of a region on Panel

Question

Hi there i'm using JMapViewer to show maps in my swing app and I've successfully created a panel with map tiles on it but these map tiles are of a particular area used in demo source of Map Viewer, i'm confused about how can i show the tiles of some particular area i want. Just like Google maps i want to show some location of my country (Pakistan) in the maps and i don't know how can i do it. Secondly, Please explain what are Layer's and Layer Group in JMapViewer? Just an idea.

Edit: how can i download tiles of Islamabad region and then add them to maps. What i've learnt from demo is this:

private void loadMapTiles(){
     map().setTileSource(new OsmTileSource.Mapnik());
     map().setTileLoader(new OsmTileLoader(map()));
}

But this shows some specific area they have set to.

I've downloaded JTileDownloader but i'm confused about the url thing because i don't now where to get the url of some specific area.

Answer 1

1. Given a JMapViewer named map, something like this should display Islamabad:

   Coordinate c = new Coordinate(33.7167, 73.0667);
   map.setDisplayPosition(c, 10);
   

2. org.openstreetmap.gui.jmapviewer.Demo, included in the distribution, is a complete example that illustrates how to use Layer. Click the Tree Layers Visible checkbox to see the effect.

Addendum: Here's the result using MapQuest-OSM at 11x zoom; Mapnik seems to work, too. If no TileSource includes the tiles you want, you may need one of the approaches mentioned here.