Java: April 2008 Archives

I went hunting for more information on Java Media Components, and found that there are two sessions scheduled for JavaOne that should shine some light on the new API.

https://www28.cplan.com/cc191/session_details.jsp?isid=296509&ilocation_id=191-1&ilanguage=english

https://www28.cplan.com/cc191/session_details.jsp?isid=296511&ilocation_id=191-1&ilanguage=english

I found a page documenting the tile naming schemes of the various online map providers today. With that information, and the JxMapViewer component from swingx-ws, I was able to hack together a Yahoo Maps mash-up in under an hour.

The code still has a bug in it: latitude / longitude do not translate correctly. The marker on the map should be placed on London. I'll have to do some more tweaking to see if I can finish this up. The code needed to do this is surprisingly short:

public class YahooMapFrame extends javax.swing.JFrame { TileFactoryInfo yahoo = new TileFactoryInfo(0, 17, 18, 256, true, true, "http://us.maps2.yimg.com/us.png.maps.yimg.com/png?v=3.1.0&t=m", "x", "y", "z") { @Override public String getTileUrl(int x, int y, int zoom) { int yp = ((int) Math.pow(2, 18 - zoom)) / 2 - y; String url = new StringBuffer(baseURL).append("&x=").append(x).append("&y=").append(yp).append("&z=").append(zoom).toString(); return url; } }; TileFactory factory = new DefaultTileFactory(yahoo); /** Creates new form YahooMapFrame */ public YahooMapFrame() { setLook(); initComponents(); mapKit.setTileFactory(factory); mapKit.setZoom(17); }