object GeoPoint(private val lat : Double, private val lon : Double) { require(lat <= 180 && lat >= -180) require(lon <= 180 && lon >= -180) def withLon(private val newlon) = { require(newlon <= 180 && newlon >= -180) GeoPoint.new(lat, newlon) } def withLat(private val newlat) = { require(newlat <= 180 && newlat >= -180) GeoPoint.new(newlat, lon) } def toString = { (if (lat >= 0) "N" + lat else "S" + -lat) + " " + (if (lon >= 0) "E" + lon else "W" + -lon) } }