gwt: add vtm-web-js project

vtm-web/src/org/oscim/gdx/client/UrlUpdater.java

@@ -0,0 +1,51 @@
+package org.oscim.gdx.client;
+
+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 UrlUpdater extends Timer {
+	private int curLon, curLat, curZoom, curTilt, curRot;
+	private MapPosition pos = new MapPosition();
+	private final Map mMap;
+	private String mParams = "";
+
+	public UrlUpdater(Map map) {
+		mMap = map;
+	}
+
+	public void setParams(String params) {
+		mParams = params;
+	}
+
+	@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);
+		}
+	}
+}