Locator.java

private boolean isPointInRange(double latitude, double longitude, List<GeoPoint> range) {
        int i, j;
        boolean c = false;
        int nvert = range.size();
        for (i = 0, j = nvert-1; i < nvert; j = i++) {
            GeoPoint jPoint = range.get(j);
            GeoPoint iPoint = range.get(i);
            if ( ((iPoint.Longitude >longitude) != (jPoint.Longitude>longitude)) &&
                    (latitude < (jPoint.Latitude-iPoint.Latitude) * (longitude-iPoint.Longitude) / (jPoint.Longitude-iPoint.Longitude) + iPoint.Latitude))
                c = !c;
        }
        return c;
    }