public enum Direction
{
  NORTH(0, -1, 90.0, "N"),
  EAST(1, 0, 0.0, "E"),
  SOUTH(0, 1, 270.0, "S"),
  WEST(-1, 0, 180.0, "W");
  
  static
  {
    NORTH.opposite = SOUTH;
    SOUTH.opposite = NORTH;
    EAST.opposite = WEST;
    WEST.opposite = EAST;
  }
  
  private int deltaX;
  private int deltaY;
  private double angle;
  private String abbreviation;
  private Direction opposite;
  
  private Direction(int deltaX, int deltaY, double angle, String abbreviation)
  {
    this.deltaX = deltaX;
    this.deltaY = deltaY;
    this.angle = angle;
    this.abbreviation = abbreviation;
  }
  
  public int getDeltaX()
  {
    return this.deltaX;
  }
  
  public int getDeltaY()
  {
    return this.deltaY;
  }
  
  public String getAbbreviation()
  {
    return this.abbreviation;
  }
  
  public double getAngle()
  {
    return this.angle;
  }
  
  public Direction getOpposite()
  {
    return this.opposite;
  }
  
  public String toString()
  {
    return this.abbreviation;
  }
}