MapUrl.java

package org.oscim.gdx.client;

import java.util.HashMap;

import org.oscim.core.MapPosition;
import org.oscim.core.MercatorProjection;
import org.oscim.map.Map;

import com.google.gwt.user.client.Timer;
import com.google.gwt.user.client.Window;

public class MapUrl extends Timer {
	private int curLon, curLat, curZoom, curTilt, curRot;
	private MapPosition pos = new MapPosition();
	private final Map mMap;
	private String mParams = "";

	public MapUrl(Map map) {
		mMap = map;
	}

	public String getParam(String name) {
		return params.get(name);
	}

	public final HashMap<String, String> params = new HashMap<String, String>();

	public void parseUrl(MapPosition pos) {

		//String addOpts = "";
		if (Window.Location.getHash() == null)
			return;

		String hash = Window.Location.getHash();
		hash = hash.substring(1);
		String[] urlParams = null;
		urlParams = hash.split("&");
		if (urlParams.length == 1)
			urlParams = hash.split(",");
		double lat = pos.getLatitude(), lon = pos.getLongitude();
		float rotation = pos.bearing;
		float tilt = pos.tilt;

		//String themeName = "";
		//String mapName = "";

		int zoom = pos.zoomLevel;

		for (String p : urlParams) {
			try {
				if (p.startsWith("lat="))
					lat = Double.parseDouble(p.substring(4));

				else if (p.startsWith("lon="))
					lon = Double.parseDouble(p.substring(4));
				else if (p.startsWith("scale="))
					zoom = Integer.parseInt(p.substring(6));
				else if (p.startsWith("rot="))
					rotation = Float.parseFloat(p.substring(4));
				else if (p.startsWith("tilt="))
					tilt = Float.parseFloat(p.substring(5));
				//	else if (p.startsWith("theme="))
				//		themeName = p.substring(6);
				//	else if (p.startsWith("map="))
				//		mapName = p.substring(4);
				else {
					String[] opt = p.split("=");
					if (opt.length > 1)
						params.put(opt[0], opt[1]);
					else
						params.put(opt[0], null);

					mParams += p + "&";

				}
			} catch (NumberFormatException e) {

			}
		}
		pos.setPosition(lat, lon);
		pos.setZoomLevel(zoom);
		pos.set(MercatorProjection.longitudeToX(lon),
		        MercatorProjection.latitudeToY(lat),
		        1 << zoom,
		        rotation,
		        tilt);

	}

	@Override
	public void run() {
		mMap.viewport().getMapPosition(pos);
		int lat = (int) (MercatorProjection.toLatitude(pos.y) * 1000);
		int lon = (int) (MercatorProjection.toLongitude(pos.x) * 1000);
		int rot = (int) (pos.bearing);
		rot = (int) (pos.bearing) % 360;
		//rot = rot < 0 ? -rot : rot;

		if (curZoom != pos.zoomLevel || curLat != lat || curLon != lon
		        || curTilt != rot || curRot != (int) (pos.bearing)) {

			curLat = lat;
			curLon = lon;
			curZoom = pos.zoomLevel;
			curTilt = (int) pos.tilt;
			curRot = rot;

			String newURL = Window.Location
			    .createUrlBuilder()
			    .setHash(mParams
			            + "scale=" + pos.zoomLevel
			            + "&rot=" + curRot
			            + "&tilt=" + curTilt
			            + "&lat=" + (curLat / 1000f)
			            + "&lon=" + (curLon / 1000f))
			    .buildString();
			Window.Location.replace(newURL);
		}
	}
}