* @throws SlickException - se la mappa non � leggibile/non trovata
*/
public Mappa(WorldEngine we, String percorso) throws SlickException{
this.worldEngine = we;
this.map = new TiledMap(percorso);
// build a collision map based on tile properties in the TileD map
blocked = getMatrix(map,"blocked","true",Helper.LAYER_GROUND);
// carica le entit� dalla mappa
gigi = getMatrix(map, "gigi", "true",Helper.LAYER_ACTORS);