コード例 #1
0
  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);
  }
コード例 #2
0
  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.
    };
  }