public static Sector boundingSector(Iterable<? extends LatLon> locations) {
if (locations == null) {
throw new IllegalArgumentException("Positions List Is Null");
}
if (!locations.iterator().hasNext()) {
return EMPTY_SECTOR; // TODO: should be returning null
}
double minLat = Angle.POS90.getDegrees();
double minLon = Angle.POS180.getDegrees();
double maxLat = Angle.NEG90.getDegrees();
double maxLon = Angle.NEG180.getDegrees();
for (LatLon p : locations) {
double lat = p.getLatitude().getDegrees();
if (lat < minLat) {
minLat = lat;
}
if (lat > maxLat) {
maxLat = lat;
}
double lon = p.getLongitude().getDegrees();
if (lon < minLon) {
minLon = lon;
}
if (lon > maxLon) {
maxLon = lon;
}
}
return Sector.fromDegrees(minLat, maxLat, minLon, maxLon);
}
public static Sector[] splitBoundingSectors(Iterable<? extends LatLon> locations) {
if (locations == null) {
throw new IllegalArgumentException("Location In List Is Null");
}
if (!locations.iterator().hasNext()) {
return null;
}
double minLat = Angle.POS90.getDegrees();
double minLon = Angle.POS180.getDegrees();
double maxLat = Angle.NEG90.getDegrees();
double maxLon = Angle.NEG180.getDegrees();
LatLon lastLocation = null;
for (LatLon ll : locations) {
double lat = ll.getLatitude().getDegrees();
if (lat < minLat) {
minLat = lat;
}
if (lat > maxLat) {
maxLat = lat;
}
double lon = ll.getLongitude().getDegrees();
if (lon >= 0 && lon < minLon) {
minLon = lon;
}
if (lon <= 0 && lon > maxLon) {
maxLon = lon;
}
if (lastLocation != null) {
double lastLon = lastLocation.getLongitude().getDegrees();
if (Math.signum(lon) != Math.signum(lastLon)) {
if (Math.abs(lon - lastLon) < 180) {
// Crossing the zero longitude line too
maxLon = 0;
minLon = 0;
}
}
}
lastLocation = ll;
}
if (minLat == maxLat && minLon == maxLon) {
return null;
}
return new Sector[] {
Sector.fromDegrees(minLat, maxLat, minLon, 180), // Sector on eastern hemisphere.
Sector.fromDegrees(minLat, maxLat, -180, maxLon) // Sector on western hemisphere.
};
}
