class ArrowPanel extends JPanel
{
  public static final int LEFT      = 0,
                          RIGHT     = 1, 						
                          UP        = 2,
                          DOWN      = 3,
                          UPLEFT    = 4, 
                          UPRIGHT   = 5,	
                          DOWNLEFT  = 6,
                          DOWNRIGHT = 7;

  private int direction;  // What direction arrow points--one of the static variables above.
  private Color arrowColor = Color.green;  // These three variables are the  
  private int arrowSize = 17;              // values that you control to
  private int extraSpace = 2;              // control how the arrows look.
  
  public ArrowPanel(int direction)
  {
    this.direction = direction;
    setBackground(Color.black);
  }

  public void paintComponent(Graphics g)
  {
    super.paintComponent(g);

    int width = getSize().width,
        height = getSize().height,
        x = (width - arrowSize)/2,
        y = (height - arrowSize)/2;

    int X[] = {-1,-1,-1},  // These values are determined below, depending on what type of arrow to draw 
        Y[] = {-1,-1,-1};  // but need default values that are off-screen.

    if (direction == LEFT)
    {
      X[0] = x+extraSpace;
      Y[0] = y + arrowSize/2;
      X[1] = x-extraSpace + arrowSize;
      Y[1] = y; 
      X[2] = x-extraSpace + arrowSize;
      Y[2] = y + arrowSize; 
    }
    else if (direction == RIGHT)
    {
      X[0] = x+extraSpace;
      Y[0] = y; 
      X[1] = x+extraSpace;
      Y[1] = y + arrowSize; 
      X[2] = x-extraSpace + arrowSize;
      Y[2] = y + arrowSize/2;
    }
    else if (direction == UP)
    {
      X[0] = x; 
      Y[0] = y-extraSpace + arrowSize;
      X[1] = x + arrowSize/2;
      Y[1] = y+extraSpace;
      X[2] = x + arrowSize;  
      Y[2] = y-extraSpace + arrowSize;   
    }
    else if (direction == DOWN)
    {
      X[0] = x; 
      Y[0] = y+extraSpace;
      X[1] = x + arrowSize/2;
      Y[1] = y-extraSpace + arrowSize;
      X[2] = x + arrowSize; 
      Y[2] = y+extraSpace;   
    }
    else if (direction == UPLEFT)
    {
      X[0] = x+extraSpace;
      Y[0] = y+extraSpace;
      X[1] = x+extraSpace;
      Y[1] = y-extraSpace + arrowSize;
      X[2] = x-extraSpace + arrowSize;
      Y[2] = y+extraSpace;    
    }
    else if (direction == UPRIGHT)
    {
      X[0] = x+extraSpace;
      Y[0] = y+extraSpace;
      X[1] = x-extraSpace + arrowSize;
      Y[1] = y+extraSpace;
      X[2] = x-extraSpace + arrowSize;
      Y[2] = y-extraSpace +arrowSize;   
    }
    else if (direction == DOWNLEFT)
    {
      X[0] = x+extraSpace;
      Y[0] = y+extraSpace;
      X[1] = x+extraSpace;
      Y[1] = y-extraSpace + arrowSize;
      X[2] = x-extraSpace+arrowSize;
      Y[2] = y-extraSpace + arrowSize;  
    }
    else if (direction == DOWNRIGHT)
    {
      X[0] = x+extraSpace;
      Y[0] = y-extraSpace + arrowSize;
      X[1] = x-extraSpace + arrowSize;
      Y[1] = y+extraSpace;
      X[2] = x-extraSpace + arrowSize;
      Y[2] = y-extraSpace + arrowSize;  
    }
		
    g.setColor(arrowColor);
    g.fillPolygon(X,Y,3);

  } // end method paint

  public Dimension getPreferredSize()
  {
    return (new Dimension(arrowSize+2*extraSpace, arrowSize+2*extraSpace));
  }

} // end class ArrowPanel